diff --git a/assets/scratch_cat.svg b/assets/scratch_cat.svg
new file mode 100644
index 00000000..82345546
--- /dev/null
+++ b/assets/scratch_cat.svg
@@ -0,0 +1,42 @@
+<svg version="1.1" id="cat" x="0px" y="0px" width="95px" height="111px" viewBox="0 0 95 111" enable-background="new 0 0 95 111" xml:space="preserve" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <g>
+    <g id="Layer_3">
+      <path fill="#FAA51D" stroke="#000000" d="M22.462,79.039c-2.415-0.451-5.304-1.309-7.742-3.503&#xD;&#xA;&#x9;&#x9;C9.268,70.629,7.526,62.535,3.672,64.622c-3.856,2.088-3.782,15.165,8.353,19.194c4.182,1.391,7.998,1.396,11.091,1.312&#xD;&#xA;&#x9;&#x9;c0.811-0.025,7.717-0.654,10.079-4.074c2.361-3.42,0.719-4.272-0.09-4.744C32.295,75.838,25.878,79.677,22.462,79.039z"/>
+      <path fill="#FFFFFF" d="M4.236,64.877c-1.989,0.613-3.075,4.998-2.076,8.484c0.998,3.49,2.634,5.022,3.863,6.398&#xD;&#xA;&#x9;&#x9;c1.528,1.038-0.72-2.402,1.361-4.15c2.075-1.744,5.733-0.914,5.733-0.914s-2.909-3.987-4.57-6.396&#xD;&#xA;&#x9;&#x9;C6.975,65.988,6.359,64.375,4.236,64.877z"/>
+    </g>
+    <g>
+      <path fill="#FAA51D" d="M38.217,86.756c0,0-8.832,6.2-17.071,8.412l0.086,0.215c1.247,1.824,5.87,7.497-0.334,9.496&#xD;&#xA;&#x9;&#x9;c-5.333,1.717-15.12-13.104-10.821-15.902c2.626-1.713,4.892-0.252,4.892-0.252s3.474-1.07,6.001-2.345&#xD;&#xA;&#x9;&#x9;c4.303-2.161,5.784-3.453,5.784-3.453s4.184-4.306,6.856-4.137C36.281,78.96,41.669,83.504,38.217,86.756z"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M21.232,95.383c1.247,1.824,5.87,7.497-0.334,9.496&#xD;&#xA;&#x9;&#x9;c-5.333,1.717-15.329-13.344-11.03-16.145c2.626-1.713,5.101-0.01,5.101-0.01s3.474-1.072,6.001-2.348&#xD;&#xA;&#x9;&#x9;c4.303-2.161,5.784-3.453,5.784-3.453"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M38.217,86.756c0,0-10.123,7.107-18.804,8.819"/>
+    </g>
+    <path fill="#FAA51D" stroke="#231F20" stroke-width="1.2" d="M52.169,74.885c0,0,1.235,0.165,4.744,3.676&#xD;&#xA;&#x9;c3.509,3.508,6.026,2.16,8.911,0.724c2.877-1.443,10.537-6.126,6.49-9.817c-4.049-3.688-6.207,1.146-9.715,2.405&#xD;&#xA;&#x9;c-3.512,1.26-5.061-2.487-6.858-4.287c-0.589-0.593-1.188-1.099-1.729-1.505c0,0-0.971-0.76-1.906,2.79&#xD;&#xA;&#x9;C51.172,72.412,50.162,73.415,52.169,74.885z"/>
+    <g id="Layer_2_1_">
+      <path fill="#FAA51D" stroke="#231F20" stroke-width="1.2" d="M46.753,82.012c1.188-0.912,2.397-2.402,3.951-4.713&#xD;&#xA;&#x9;&#x9;c1.296-1.927,2.7-5.578,2.7-5.578c0.875-2.521,1.934-6.576-1.902-7.296c-1.553-0.291-4.079-0.098-7.67-0.776&#xD;&#xA;&#x9;&#x9;c-3.593-0.681-6.798-2.522-9.517,2.233c-2.718,4.757-9.59,8.271-1.056,16.563c0,0,4.901,3.842,10.764,9.639&#xD;&#xA;&#x9;&#x9;c4.831,4.775,12.045,10.602,12.045,10.602s18.972,2.188,19.535-0.693c1.922-9.79-14.777-6.911-14.777-6.911&#xD;&#xA;&#x9;&#x9;s-4.605-3.933-6.725-5.794c-3.478-3.059-11.125-10.771-11.125-10.771"/>
+      <path fill="#FFFFFF" d="M51.253,75.434c0,0,2.47-2.66-2.469-5.317c-4.939-2.657-7.213-0.017-8.739,1.521&#xD;&#xA;&#x9;&#x9;c-2.644,2.655,3.443,6.611,3.443,6.611l3.176,3.204c0,0,1.738-1.647,2.499-2.979C50.036,77.26,51.253,75.434,51.253,75.434"/>
+    </g>
+    <g id="Layer_8"/>
+    <path fill="#FAA51D" stroke="#231F20" stroke-width="1.2" d="M29.926,73.218c0.749-0.571,2.889-2.202,4.854-3.657&#xD;&#xA;&#x9;c2.428-1.799,6.117-5.849,1.077-7.646c-5.04-1.801-7.507,1.604-11.519,4.946c-2.159,1.801-5.308,2.699-4.319,6.209&#xD;&#xA;&#x9;c0.993,3.511,4.862,13.408,11.789,10.17c6.929-3.239-1.799-9.18-3.06-11.157"/>
+    <g id="Layer_2">
+      <path fill="#FAA51D" stroke="#231F20" stroke-width="1.2" d="M52.709,14.156c-1.54-0.143-4.75-0.316-6.518-0.231&#xD;&#xA;&#x9;&#x9;c-4.728,0.225-9.224,1.928-9.224,1.928L23.949,7.357l2.235,18.906c0.646-0.782-10.555,12.804-3.479,24.224&#xD;&#xA;&#x9;&#x9;c7.08,11.426,22.233,16.518,40.988,12.792c18.755-3.729,23.229-14.531,21.986-20.246c-1.242-5.714-8.322-7.823-8.322-7.823&#xD;&#xA;&#x9;&#x9;s-0.09-4.48-3.328-9.97c-1.926-3.268-8.348-8.041-8.348-8.041L62.822,5.647l-7.452,7.204L52.709,14.156z"/>
+      <path fill="#FFFFFF" d="M76.42,35.066l-2.482-2.064l-9.115,2.661c0,0,0,3.419-4.367,4.367c-4.37,0.951-11.211-2.277-11.211-2.277&#xD;&#xA;&#x9;&#x9;L41.46,41.17c0,0-8.437,0.928-8.739,6.081C32.048,58.704,46.1,63.479,51.425,63.783c2.905,0.167,8.235-0.338,12.277-1.141&#xD;&#xA;&#x9;&#x9;c17.752-3.234,22.551-13.919,21.31-19.635c-1.242-5.714-7.978-7.196-7.978-7.196L76.42,35.066z"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M10.673,46.155c0,0,4.107,0.374,5.974,0.268&#xD;&#xA;&#x9;&#x9;c1.865-0.107,5.492-0.587,5.492-0.587"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M81.656,40.671c0,0,4.549-0.743,6.859-1.549&#xD;&#xA;&#x9;&#x9;c2.715-0.942,4.543-2.545,4.543-2.545"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M22.337,41.909c0,0-2.384-1.777-6.117-3.43&#xD;&#xA;&#x9;&#x9;c-4.134-1.831-6.405-2.303-6.405-2.303"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M82.117,46.622c0,0,2.726,1.104,5.533,1.385&#xD;&#xA;&#x9;&#x9;c2.77,0.276,4.646,0.11,4.646,0.11"/>
+      <path fill="none" stroke="#000000" stroke-linecap="round" stroke-miterlimit="10" d="M52.35,14.212&#xD;&#xA;&#x9;&#x9;c2.84,0.7,3.887,1.469,3.887,1.469"/>
+      <line fill="none" stroke="#000000" x1="33.898" y1="13.684" x2="39.956" y2="18.042"/>
+    </g>
+    <g id="Layer_5">
+      <path fill="#FFFFFF" stroke="#231F20" d="M71.84,25.366c2.924,4.479,3.033,9.591,0.242,11.415&#xD;&#xA;&#x9;&#x9;c-2.793,1.825-7.426-0.332-10.354-4.813c-2.933-4.48-3.037-9.589-0.244-11.415C64.275,18.73,68.913,20.884,71.84,25.366z"/>
+      <path fill="#231F20" d="M71.089,32.522c0,1.08-0.802,1.956-1.8,1.956c-0.993,0-1.803-0.877-1.803-1.956&#xD;&#xA;&#x9;&#x9;c0-1.08,0.81-1.958,1.803-1.958C70.287,30.564,71.089,31.442,71.089,32.522"/>
+    </g>
+    <g id="Layer_7">
+      <path fill="#FFFFFF" stroke="#231F20" d="M47.867,28.619c2.926,4.48,2.619,9.862-0.681,12.015&#xD;&#xA;&#x9;&#x9;c-3.302,2.159-8.351,0.272-11.276-4.208c-2.928-4.48-2.624-9.86,0.678-12.017C39.891,22.253,44.938,24.137,47.867,28.619z"/>
+      <path fill="#231F20" d="M46.079,34.507c0,1.081-0.803,1.957-1.801,1.957c-0.992,0-1.803-0.878-1.803-1.957&#xD;&#xA;&#x9;&#x9;c0-1.08,0.811-1.957,1.803-1.957C45.274,32.55,46.079,33.427,46.079,34.507"/>
+    </g>
+    <path fill="#5E4A42" stroke="#000000" d="M59.766,37.926c1.854,0,4.555-0.284,4.697,0.569c0.143,0.855-1.709,4.203-2.988,4.345&#xD;&#xA;&#x9;c-1.283,0.142-6.125-2.353-6.195-3.919C55.206,37.355,58.055,37.926,59.766,37.926z"/>
+    <g id="Layer_4">
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M46.774,45.235c0,0,10.347,3.054,14.217,3.897&#xD;&#xA;&#x9;&#x9;c3.868,0.842,10.851,1.684,10.851,1.684s-7.99,10.245-17.328,7.644C45.176,55.863,45.345,49.975,46.774,45.235z"/>
+    </g>
+  </g>
+</svg>
diff --git a/assets/stage.png b/assets/stage.png
new file mode 100644
index 00000000..c60861c2
Binary files /dev/null and b/assets/stage.png differ
diff --git a/playground/index.html b/playground/index.html
index 73182ec3..dacd4c4f 100644
--- a/playground/index.html
+++ b/playground/index.html
@@ -10,18 +10,21 @@
 <body>
     <div id="vm-devtools">
         <h2>Scratch VM Playground</h2>
-        <button id="greenflag">Green flag</button>
-        <button id="stopall">Stop</button>
         <select id="selectedTarget" multiple></select>
-        <p>
-            <a id="renderexplorer-link" href="#">Renderer</a><br />
-            <a id="threadexplorer-link" href="#">VM Threads</a><br />
-            <a id="blockexplorer-link" href="#">VM Block Representation</a><br />
-            <a id="importexport-link" href="#">Import/Export</a>
-        </p>
+        <div id="projectButtons">
+            <button id="greenflag">Green flag</button>
+            <button id="stopall">Stop</button>
+        </div>
+        <br />
+        <ul id="playgroundLinks">
+            <li><a id="renderexplorer-link" href="#">Renderer</a></li>
+            <li><a id="threadexplorer-link" href="#">Threads</a></li>
+            <li><a id="blockexplorer-link" href="#">Block Representation</a></li>
+            <li><a id="importexport-link" href="#">Import/Export</a></li>
+        </ul><br />
         <div id="tab-renderexplorer">
-            Render<br />
-            <canvas id="scratch-stage" style="width: 480px; height: 360px;"></canvas>
+            Renderer<br />
+            <canvas id="scratch-stage" style="width: 480px; height: 360px;"></canvas><br />
         </div>
         <div id="tab-threadexplorer">
             Thread explorer
@@ -32,14 +35,14 @@
             <pre id="blockexplorer"></pre>
         </div>
         <div id="tab-importexport">
-            Import/Export
-            <input id="projectId" value="119615668" />
-            <button id="projectLoadButton">Load SB2</button><br />
+            Import/Export<br />
+            Project ID: <input id="projectId" value="119615668" />
+            <button id="projectLoadButton">Load</button><br />
             <p>
                 <input type="button" value="Export to XML" onclick="toXml()">
                 &nbsp;
                 <input type="button" value="Import from XML" onclick="fromXml()" id="import">
-                <br><br>
+                <br /><br />
                 <textarea id="importExport"></textarea>
             </p>
         </div>
@@ -751,7 +754,7 @@
     <script src="../audioLocal.js"></script>
     <script src="../Tone.min.js"></script>
     <!-- VM Worker -->
-    <script src="../vm.worker.js"></script>
+    <script src="../vm.js"></script>
     <!-- Playground -->
     <script src="./playground.js"></script>
     <script>
diff --git a/playground/playground.css b/playground/playground.css
index 32dd5583..41586749 100644
--- a/playground/playground.css
+++ b/playground/playground.css
@@ -4,6 +4,9 @@ body {
 a {
     color: rgb(217,217,217);
 }
+h2 {
+    font-size: 1em;
+}
 #blocks {
     position: absolute;
     left: 40%;
@@ -16,13 +19,12 @@ a {
     position: absolute;
     left: 1%;
     right: 60%;
-    top: 0;
+    top: 1%;
     bottom: 0;
     width: 35%;
 }
 #blockexplorer, #threadexplorer, #importexport {
     position: absolute;
-    width: 100%;
     height: 75%;
     overflow: scroll;
     border: 1px solid #fff;
@@ -30,17 +32,41 @@ a {
     color: rgb(217,217,217);
     font-family: monospace;
     font-size: 10pt;
+    width: 480px;
+    height: 360px;
 }
-
 #tab-blockexplorer, #tab-threadexplorer, #tab-importexport {
     display: none;
 }
-
 #importExport {
-    width: 400px;
+    width: 480px;
     height: 360px;
     background: rgb(36,36,36);
     color: rgb(217,217,217);
+}
+#projectId {
+    background: rgb(36,36,36);
+    color: rgb(217,217,217);
     font-family: monospace;
     font-size: 10pt;
 }
+ul#playgroundLinks {
+    display: block;
+    list-style-type: none;
+    margin: 0;
+    padding: 0;
+    overflow: hidden;
+    background-color: #333;
+}
+#playgroundLinks li {
+    float: left;
+}
+#playgroundLinks li a {
+    display: block;
+    color: white;
+    text-align: center;
+    padding: 5px 10px;
+}
+#playgroundLinks li a:hover {
+    background-color: #111;
+}
diff --git a/playground/playground.js b/playground/playground.js
index 49cc74aa..fa91cd27 100644
--- a/playground/playground.js
+++ b/playground/playground.js
@@ -1,11 +1,20 @@
 var loadProject = function () {
-    var id = location.hash.substring(1) || 119615668;
+    var id = location.hash.substring(1);
+    if (id.length < 1) {
+        id = '119615668';
+    }
     var url = 'https://projects.scratch.mit.edu/internalapi/project/' +
         id + '/get/';
     var r = new XMLHttpRequest();
-    r.addEventListener('load', function() {
-        window.vm.loadProject(this.responseText);
-    });
+    r.onreadystatechange = function() {
+        if (this.readyState === 4) {
+            if (r.status === 200) {
+                window.vm.loadProject(this.responseText);
+            } else {
+                window.vm.createEmptyProject();
+            }
+        }
+    };
     r.open('GET', url);
     r.send();
 };
@@ -26,7 +35,6 @@ window.onload = function() {
     // Instantiate the renderer and connect it to the VM.
     var canvas = document.getElementById('scratch-stage');
     window.renderer = new window.RenderWebGLLocal(canvas);
-    window.renderer.connectWorker(window.vm.vmWorker);
 
     // Instantiate audio engine and connect it to the VM
     window.audioLocal = new window.AudioLocal();
@@ -156,17 +164,35 @@ window.onload = function() {
     document.addEventListener('mousemove', function (e) {
         var rect = canvas.getBoundingClientRect();
         var coordinates = {
-            x: e.clientX - rect.left - rect.width / 2,
-            y: e.clientY - rect.top - rect.height / 2
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+            canvasWidth: rect.width,
+            canvasHeight: rect.height
         };
         window.vm.postIOData('mouse', coordinates);
     });
     canvas.addEventListener('mousedown', function (e) {
-        window.vm.postIOData('mouse', {isDown: true});
+        var rect = canvas.getBoundingClientRect();
+        var data = {
+            isDown: true,
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+            canvasWidth: rect.width,
+            canvasHeight: rect.height
+        };
+        window.vm.postIOData('mouse', data);
         e.preventDefault();
     });
     canvas.addEventListener('mouseup', function (e) {
-        window.vm.postIOData('mouse', {isDown: false});
+        var rect = canvas.getBoundingClientRect();
+        var data = {
+            isDown: false,
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+            canvasWidth: rect.width,
+            canvasHeight: rect.height
+        };
+        window.vm.postIOData('mouse', data);
         e.preventDefault();
     });
 
diff --git a/src/blocks/scratch3_control.js b/src/blocks/scratch3_control.js
index 25221c1c..bc9213f2 100644
--- a/src/blocks/scratch3_control.js
+++ b/src/blocks/scratch3_control.js
@@ -1,3 +1,4 @@
+var Cast = require('../util/cast');
 var Promise = require('promise');
 
 function Scratch3ControlBlocks(runtime) {
@@ -25,9 +26,10 @@ Scratch3ControlBlocks.prototype.getPrimitives = function() {
 };
 
 Scratch3ControlBlocks.prototype.repeat = function(args, util) {
+    var times = Math.floor(Cast.toNumber(args.TIMES));
     // Initialize loop
     if (util.stackFrame.loopCounter === undefined) {
-        util.stackFrame.loopCounter = parseInt(args.TIMES);
+        util.stackFrame.loopCounter = times;
     }
     // Only execute once per frame.
     // When the branch finishes, `repeat` will be executed again and
@@ -47,13 +49,14 @@ Scratch3ControlBlocks.prototype.repeat = function(args, util) {
 };
 
 Scratch3ControlBlocks.prototype.repeatUntil = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
     // Only execute once per frame.
     // When the branch finishes, `repeat` will be executed again and
     // the second branch will be taken, yielding for the rest of the frame.
     if (!util.stackFrame.executedInFrame) {
         util.stackFrame.executedInFrame = true;
         // If the condition is true, start the branch.
-        if (!args.CONDITION) {
+        if (!condition) {
             util.startBranch();
         }
     } else {
@@ -76,30 +79,33 @@ Scratch3ControlBlocks.prototype.forever = function(args, util) {
 };
 
 Scratch3ControlBlocks.prototype.wait = function(args) {
+    var duration = Cast.toNumber(args.DURATION);
     return new Promise(function(resolve) {
         setTimeout(function() {
             resolve();
-        }, 1000 * args.DURATION);
+        }, 1000 * duration);
     });
 };
 
 Scratch3ControlBlocks.prototype.if = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
     // Only execute one time. `if` will be returned to
     // when the branch finishes, but it shouldn't execute again.
     if (util.stackFrame.executedInFrame === undefined) {
         util.stackFrame.executedInFrame = true;
-        if (args.CONDITION) {
+        if (condition) {
             util.startBranch();
         }
     }
 };
 
 Scratch3ControlBlocks.prototype.ifElse = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
     // Only execute one time. `ifElse` will be returned to
     // when the branch finishes, but it shouldn't execute again.
     if (util.stackFrame.executedInFrame === undefined) {
         util.stackFrame.executedInFrame = true;
-        if (args.CONDITION) {
+        if (condition) {
             util.startBranch(1);
         } else {
             util.startBranch(2);
diff --git a/src/blocks/scratch3_event.js b/src/blocks/scratch3_event.js
index 900fd1f2..dfc61291 100644
--- a/src/blocks/scratch3_event.js
+++ b/src/blocks/scratch3_event.js
@@ -1,3 +1,5 @@
+var Cast = require('../util/cast');
+
 function Scratch3EventBlocks(runtime) {
     /**
      * The runtime instantiating this block package.
@@ -29,10 +31,9 @@ Scratch3EventBlocks.prototype.getHats = function () {
         'event_whenthisspriteclicked': {
             restartExistingThreads: true
         },
-		/*
         'event_whenbackdropswitchesto': {
             restartExistingThreads: true
-        },*/
+        },
         'event_whengreaterthan': {
             restartExistingThreads: false,
             edgeActivated: true
@@ -44,26 +45,30 @@ Scratch3EventBlocks.prototype.getHats = function () {
 };
 
 Scratch3EventBlocks.prototype.hatGreaterThanPredicate = function (args, util) {
+    var option = Cast.toString(args.WHENGREATERTHANMENU).toLowerCase();
+    var value = Cast.toNumber(args.VALUE);
     // @todo: Other cases :)
-    if (args.WHENGREATERTHANMENU == 'TIMER') {
-        return util.ioQuery('clock', 'projectTimer') > args.VALUE;
+    if (option == 'timer') {
+        return util.ioQuery('clock', 'projectTimer') > value;
     }
     return false;
 };
 
 Scratch3EventBlocks.prototype.broadcast = function(args, util) {
+    var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
     util.startHats('event_whenbroadcastreceived', {
-        'BROADCAST_OPTION': args.BROADCAST_OPTION
+        'BROADCAST_OPTION': broadcastOption
     });
 };
 
 Scratch3EventBlocks.prototype.broadcastAndWait = function (args, util) {
+    var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
     // Have we run before, starting threads?
     if (!util.stackFrame.startedThreads) {
         // No - start hats for this broadcast.
         util.stackFrame.startedThreads = util.startHats(
             'event_whenbroadcastreceived', {
-                'BROADCAST_OPTION': args.BROADCAST_OPTION
+                'BROADCAST_OPTION': broadcastOption
             }
         );
         if (util.stackFrame.startedThreads.length == 0) {
diff --git a/src/blocks/scratch3_looks.js b/src/blocks/scratch3_looks.js
index 33e1ef3b..35a9136d 100644
--- a/src/blocks/scratch3_looks.js
+++ b/src/blocks/scratch3_looks.js
@@ -1,3 +1,5 @@
+var Cast = require('../util/cast');
+
 function Scratch3LooksBlocks(runtime) {
     /**
      * The runtime instantiating this block package.
@@ -18,13 +20,20 @@ Scratch3LooksBlocks.prototype.getPrimitives = function() {
         'looks_thinkforsecs': this.sayforsecs,
         'looks_show': this.show,
         'looks_hide': this.hide,
-        'looks_effectmenu': this.effectMenu,
+        'looks_switchcostumeto': this.switchCostume,
+        'looks_switchbackdropto': this.switchBackdrop,
+        'looks_switchbackdroptoandwait': this.switchBackdropAndWait,
+        'looks_nextcostume': this.nextCostume,
+        'looks_nextbackdrop': this.nextBackdrop,
         'looks_changeeffectby': this.changeEffect,
         'looks_seteffectto': this.setEffect,
         'looks_cleargraphiceffects': this.clearEffects,
         'looks_changesizeby': this.changeSize,
         'looks_setsizeto': this.setSize,
-        'looks_size': this.getSize
+        'looks_size': this.getSize,
+        'looks_costumeorder': this.getCostumeIndex,
+        'looks_backdroporder': this.getBackdropIndex,
+        'looks_backdropname': this.getBackdropName
     };
 };
 
@@ -66,17 +75,105 @@ Scratch3LooksBlocks.prototype.hide = function (args, util) {
     util.target.setVisible(false);
 };
 
-Scratch3LooksBlocks.prototype.effectMenu = function (args) {
-    return args.EFFECT.toLowerCase();
+/**
+ * Utility function to set the costume or backdrop of a target.
+ * Matches the behavior of Scratch 2.0 for different types of arguments.
+ * @param {!Target} target Target to set costume/backdrop to.
+ * @param {Any} requestedCostume Costume requested, e.g., 0, 'name', etc.
+ * @param {boolean=} opt_zeroIndex Set to zero-index the requestedCostume.
+ * @return {Array.<!Thread>} Any threads started by this switch.
+ */
+Scratch3LooksBlocks.prototype._setCostumeOrBackdrop = function (target,
+        requestedCostume, opt_zeroIndex) {
+    if (typeof requestedCostume === 'number') {
+        target.setCostume(opt_zeroIndex ?
+            requestedCostume : requestedCostume - 1);
+    } else {
+        var costumeIndex = target.getCostumeIndexByName(requestedCostume);
+        if (costumeIndex > -1) {
+            target.setCostume(costumeIndex);
+        } else if (costumeIndex == 'previous costume' ||
+                   costumeIndex == 'previous backdrop') {
+            target.setCostume(target.currentCostume - 1);
+        } else if (costumeIndex == 'next costume' ||
+                   costumeIndex == 'next backdrop') {
+            target.setCostume(target.currentCostume + 1);
+        } else {
+            var forcedNumber = Cast.toNumber(requestedCostume);
+            if (!isNaN(forcedNumber)) {
+                target.setCostume(opt_zeroIndex ?
+                    forcedNumber : forcedNumber - 1);
+            }
+        }
+    }
+    if (target == this.runtime.getTargetForStage()) {
+        // Target is the stage - start hats.
+        var newName = target.sprite.costumes[target.currentCostume].name;
+        return this.runtime.startHats('event_whenbackdropswitchesto', {
+            'BACKDROP': newName
+        });
+    }
+    return [];
+};
+
+Scratch3LooksBlocks.prototype.switchCostume = function (args, util) {
+    this._setCostumeOrBackdrop(util.target, args.COSTUME);
+};
+
+Scratch3LooksBlocks.prototype.nextCostume = function (args, util) {
+    this._setCostumeOrBackdrop(
+        util.target, util.target.currentCostume + 1, true
+    );
+};
+
+Scratch3LooksBlocks.prototype.switchBackdrop = function (args) {
+    this._setCostumeOrBackdrop(this.runtime.getTargetForStage(), args.BACKDROP);
+};
+
+Scratch3LooksBlocks.prototype.switchBackdropAndWait = function (args, util) {
+    // Have we run before, starting threads?
+    if (!util.stackFrame.startedThreads) {
+        // No - switch the backdrop.
+        util.stackFrame.startedThreads = (
+            this._setCostumeOrBackdrop(
+                this.runtime.getTargetForStage(),
+                args.BACKDROP
+            )
+        );
+        if (util.stackFrame.startedThreads.length == 0) {
+            // Nothing was started.
+            return;
+        }
+    }
+    // We've run before; check if the wait is still going on.
+    var instance = this;
+    var waiting = util.stackFrame.startedThreads.some(function(thread) {
+        return instance.runtime.isActiveThread(thread);
+    });
+    if (waiting) {
+        util.yieldFrame();
+    }
+};
+
+Scratch3LooksBlocks.prototype.nextBackdrop = function () {
+    var stage = this.runtime.getTargetForStage();
+    this._setCostumeOrBackdrop(
+        stage, stage.currentCostume + 1, true
+    );
 };
 
 Scratch3LooksBlocks.prototype.changeEffect = function (args, util) {
-    var newValue = args.CHANGE + util.target.effects[args.EFFECT];
-    util.target.setEffect(args.EFFECT, newValue);
+    var effect = Cast.toString(args.EFFECT).toLowerCase();
+    var change = Cast.toNumber(args.CHANGE);
+    if (!util.target.effects.hasOwnProperty(effect)) return;
+    var newValue = change + util.target.effects[effect];
+    util.target.setEffect(effect, newValue);
 };
 
 Scratch3LooksBlocks.prototype.setEffect = function (args, util) {
-    util.target.setEffect(args.EFFECT, args.VALUE);
+    var effect = Cast.toString(args.EFFECT).toLowerCase();
+    var value = Cast.toNumber(args.VALUE);
+    util.target.setEffect(effect, value);
 };
 
 Scratch3LooksBlocks.prototype.clearEffects = function (args, util) {
@@ -84,15 +181,31 @@ Scratch3LooksBlocks.prototype.clearEffects = function (args, util) {
 };
 
 Scratch3LooksBlocks.prototype.changeSize = function (args, util) {
-    util.target.setSize(util.target.size + args.CHANGE);
+    var change = Cast.toNumber(args.CHANGE);
+    util.target.setSize(util.target.size + change);
 };
 
 Scratch3LooksBlocks.prototype.setSize = function (args, util) {
-    util.target.setSize(args.SIZE);
+    var size = Cast.toNumber(args.SIZE);
+    util.target.setSize(size);
 };
 
 Scratch3LooksBlocks.prototype.getSize = function (args, util) {
     return util.target.size;
 };
 
+Scratch3LooksBlocks.prototype.getBackdropIndex = function () {
+    var stage = this.runtime.getTargetForStage();
+    return stage.currentCostume + 1;
+};
+
+Scratch3LooksBlocks.prototype.getBackdropName = function () {
+    var stage = this.runtime.getTargetForStage();
+    return stage.sprite.costumes[stage.currentCostume].name;
+};
+
+Scratch3LooksBlocks.prototype.getCostumeIndex = function (args, util) {
+    return util.target.currentCostume + 1;
+};
+
 module.exports = Scratch3LooksBlocks;
diff --git a/src/blocks/scratch3_motion.js b/src/blocks/scratch3_motion.js
index 730eee03..10679750 100644
--- a/src/blocks/scratch3_motion.js
+++ b/src/blocks/scratch3_motion.js
@@ -1,4 +1,6 @@
+var Cast = require('../util/cast');
 var MathUtil = require('../util/math-util');
+var Timer = require('../util/timer');
 
 function Scratch3MotionBlocks(runtime) {
     /**
@@ -19,6 +21,7 @@ Scratch3MotionBlocks.prototype.getPrimitives = function() {
         'motion_turnright': this.turnRight,
         'motion_turnleft': this.turnLeft,
         'motion_pointindirection': this.pointInDirection,
+        'motion_glidesecstoxy': this.glide,
         'motion_changexby': this.changeX,
         'motion_setx': this.setX,
         'motion_changeyby': this.changeY,
@@ -30,42 +33,87 @@ Scratch3MotionBlocks.prototype.getPrimitives = function() {
 };
 
 Scratch3MotionBlocks.prototype.moveSteps = function (args, util) {
+    var steps = Cast.toNumber(args.STEPS);
     var radians = MathUtil.degToRad(util.target.direction);
-    var dx = args.STEPS * Math.cos(radians);
-    var dy = args.STEPS * Math.sin(radians);
+    var dx = steps * Math.cos(radians);
+    var dy = steps * Math.sin(radians);
     util.target.setXY(util.target.x + dx, util.target.y + dy);
 };
 
 Scratch3MotionBlocks.prototype.goToXY = function (args, util) {
-    util.target.setXY(args.X, args.Y);
+    var x = Cast.toNumber(args.X);
+    var y = Cast.toNumber(args.Y);
+    util.target.setXY(x, y);
 };
 
 Scratch3MotionBlocks.prototype.turnRight = function (args, util) {
-    util.target.setDirection(util.target.direction + args.DEGREES);
+    var degrees = Cast.toNumber(args.DEGREES);
+    util.target.setDirection(util.target.direction + degrees);
 };
 
 Scratch3MotionBlocks.prototype.turnLeft = function (args, util) {
-    util.target.setDirection(util.target.direction - args.DEGREES);
+    var degrees = Cast.toNumber(args.DEGREES);
+    util.target.setDirection(util.target.direction - degrees);
 };
 
 Scratch3MotionBlocks.prototype.pointInDirection = function (args, util) {
-    util.target.setDirection(args.DIRECTION);
+    var direction = Cast.toNumber(args.DIRECTION);
+    util.target.setDirection(direction);
+};
+
+Scratch3MotionBlocks.prototype.glide = function (args, util) {
+    if (!util.stackFrame.timer) {
+        // First time: save data for future use.
+        util.stackFrame.timer = new Timer();
+        util.stackFrame.timer.start();
+        util.stackFrame.duration = Cast.toNumber(args.SECS);
+        util.stackFrame.startX = util.target.x;
+        util.stackFrame.startY = util.target.y;
+        util.stackFrame.endX = Cast.toNumber(args.X);
+        util.stackFrame.endY = Cast.toNumber(args.Y);
+        if (util.stackFrame.duration <= 0) {
+            // Duration too short to glide.
+            util.target.setXY(util.stackFrame.endX, util.stackFrame.endY);
+            return;
+        }
+        util.yieldFrame();
+    } else {
+        var timeElapsed = util.stackFrame.timer.timeElapsed();
+        if (timeElapsed < util.stackFrame.duration * 1000) {
+            // In progress: move to intermediate position.
+            var frac = timeElapsed / (util.stackFrame.duration * 1000);
+            var dx = frac * (util.stackFrame.endX - util.stackFrame.startX);
+            var dy = frac * (util.stackFrame.endY - util.stackFrame.startY);
+            util.target.setXY(
+                util.stackFrame.startX + dx,
+                util.stackFrame.startY + dy
+            );
+            util.yieldFrame();
+        } else {
+            // Finished: move to final position.
+            util.target.setXY(util.stackFrame.endX, util.stackFrame.endY);
+        }
+    }
 };
 
 Scratch3MotionBlocks.prototype.changeX = function (args, util) {
-    util.target.setXY(util.target.x + args.DX, util.target.y);
+    var dx = Cast.toNumber(args.DX);
+    util.target.setXY(util.target.x + dx, util.target.y);
 };
 
 Scratch3MotionBlocks.prototype.setX = function (args, util) {
-    util.target.setXY(args.X, util.target.y);
+    var x = Cast.toNumber(args.X);
+    util.target.setXY(x, util.target.y);
 };
 
 Scratch3MotionBlocks.prototype.changeY = function (args, util) {
-    util.target.setXY(util.target.x, util.target.y + args.DY);
+    var dy = Cast.toNumber(args.DY);
+    util.target.setXY(util.target.x, util.target.y + dy);
 };
 
 Scratch3MotionBlocks.prototype.setY = function (args, util) {
-    util.target.setXY(util.target.x, args.Y);
+    var y = Cast.toNumber(args.Y);
+    util.target.setXY(util.target.x, y);
 };
 
 Scratch3MotionBlocks.prototype.getX = function (args, util) {
diff --git a/src/blocks/scratch3_operators.js b/src/blocks/scratch3_operators.js
index 7826c526..ddd9e383 100644
--- a/src/blocks/scratch3_operators.js
+++ b/src/blocks/scratch3_operators.js
@@ -14,11 +14,6 @@ function Scratch3OperatorsBlocks(runtime) {
  */
 Scratch3OperatorsBlocks.prototype.getPrimitives = function() {
     return {
-        'math_number': this.number,
-        'math_positive_number': this.number,
-        'math_whole_number': this.number,
-        'math_angle': this.number,
-        'text': this.text,
         'operator_add': this.add,
         'operator_subtract': this.subtract,
         'operator_multiply': this.multiply,
@@ -35,19 +30,10 @@ Scratch3OperatorsBlocks.prototype.getPrimitives = function() {
         'operator_length': this.length,
         'operator_mod': this.mod,
         'operator_round': this.round,
-        'operator_mathop_menu': this.mathopMenu,
         'operator_mathop': this.mathop
     };
 };
 
-Scratch3OperatorsBlocks.prototype.number = function (args) {
-    return Cast.toNumber(args.NUM);
-};
-
-Scratch3OperatorsBlocks.prototype.text = function (args) {
-    return Cast.toString(args.TEXT);
-};
-
 Scratch3OperatorsBlocks.prototype.add = function (args) {
     return Cast.toNumber(args.NUM1) + Cast.toNumber(args.NUM2);
 };
@@ -77,20 +63,22 @@ Scratch3OperatorsBlocks.prototype.gt = function (args) {
 };
 
 Scratch3OperatorsBlocks.prototype.and = function (args) {
-    return Cast.toBoolean(args.OPERAND1 && args.OPERAND2);
+    return Cast.toBoolean(args.OPERAND1) && Cast.toBoolean(args.OPERAND2);
 };
 
 Scratch3OperatorsBlocks.prototype.or = function (args) {
-    return Cast.toBoolean(args.OPERAND1 || args.OPERAND2);
+    return Cast.toBoolean(args.OPERAND1) || Cast.toBoolean(args.OPERAND2);
 };
 
 Scratch3OperatorsBlocks.prototype.not = function (args) {
-    return Cast.toBoolean(!args.OPERAND);
+    return !Cast.toBoolean(args.OPERAND);
 };
 
 Scratch3OperatorsBlocks.prototype.random = function (args) {
-    var low = args.FROM <= args.TO ? args.FROM : args.TO;
-    var high = args.FROM <= args.TO ? args.TO : args.FROM;
+    var nFrom = Cast.toNumber(args.FROM);
+    var nTo = Cast.toNumber(args.TO);
+    var low = nFrom <= nTo ? nFrom : nTo;
+    var high = nFrom <= nTo ? nTo : nFrom;
     if (low == high) return low;
     // If both low and high are ints, truncate the result to an int.
     var lowInt = low == parseInt(low);
@@ -132,10 +120,6 @@ Scratch3OperatorsBlocks.prototype.round = function (args) {
     return Math.round(Cast.toNumber(args.NUM));
 };
 
-Scratch3OperatorsBlocks.prototype.mathopMenu = function (args) {
-    return args.OPERATOR;
-};
-
 Scratch3OperatorsBlocks.prototype.mathop = function (args) {
     var operator = Cast.toString(args.OPERATOR).toLowerCase();
     var n = Cast.toNumber(args.NUM);
diff --git a/src/blocks/scratch3_sensing.js b/src/blocks/scratch3_sensing.js
index f868a4d3..5e392ef8 100644
--- a/src/blocks/scratch3_sensing.js
+++ b/src/blocks/scratch3_sensing.js
@@ -1,3 +1,5 @@
+var Cast = require('../util/cast');
+
 function Scratch3SensingBlocks(runtime) {
     /**
      * The runtime instantiating this block package.
@@ -12,18 +14,29 @@ function Scratch3SensingBlocks(runtime) {
  */
 Scratch3SensingBlocks.prototype.getPrimitives = function() {
     return {
+        'sensing_touchingcolor': this.touchingColor,
+        'sensing_coloristouchingcolor': this.colorTouchingColor,
         'sensing_timer': this.getTimer,
         'sensing_resettimer': this.resetTimer,
         'sensing_mousex': this.getMouseX,
         'sensing_mousey': this.getMouseY,
         'sensing_mousedown': this.getMouseDown,
-        'sensing_keyoptions': this.keyOptions,
         'sensing_keypressed': this.getKeyPressed,
-        'sensing_current': this.current,
-        'sensing_currentmenu': this.currentMenu
+        'sensing_current': this.current
     };
 };
 
+Scratch3SensingBlocks.prototype.touchingColor = function (args, util) {
+    var color = Cast.toRgbColorList(args.COLOR);
+    return util.target.isTouchingColor(color);
+};
+
+Scratch3SensingBlocks.prototype.colorTouchingColor = function (args, util) {
+    var maskColor = Cast.toRgbColorList(args.COLOR);
+    var targetColor = Cast.toRgbColorList(args.COLOR2);
+    return util.target.colorIsTouchingColor(targetColor, maskColor);
+};
+
 Scratch3SensingBlocks.prototype.getTimer = function (args, util) {
     return util.ioQuery('clock', 'projectTimer');
 };
@@ -45,8 +58,9 @@ Scratch3SensingBlocks.prototype.getMouseDown = function (args, util) {
 };
 
 Scratch3SensingBlocks.prototype.current = function (args) {
+    var menuOption = Cast.toString(args.CURRENTMENU).toLowerCase();
     var date = new Date();
-    switch (args.CURRENTMENU) {
+    switch (menuOption) {
     case 'year': return date.getFullYear();
     case 'month': return date.getMonth() + 1; // getMonth is zero-based
     case 'date': return date.getDate();
@@ -55,18 +69,11 @@ Scratch3SensingBlocks.prototype.current = function (args) {
     case 'minute': return date.getMinutes();
     case 'second': return date.getSeconds();
     }
-};
-
-Scratch3SensingBlocks.prototype.currentMenu = function (args) {
-    return args.CURRENTMENU.toLowerCase();
-};
-
-Scratch3SensingBlocks.prototype.keyOptions = function (args) {
-    return args.KEY_OPTION.toLowerCase();
+    return 0;
 };
 
 Scratch3SensingBlocks.prototype.getKeyPressed = function (args, util) {
-    return util.ioQuery('keyboard', 'getKeyIsDown', args.KEY_OPTIONS);
+    return util.ioQuery('keyboard', 'getKeyIsDown', args.KEY_OPTION);
 };
 
 module.exports = Scratch3SensingBlocks;
diff --git a/src/engine/adapter.js b/src/engine/adapter.js
index 90e401d6..26f52be9 100644
--- a/src/engine/adapter.js
+++ b/src/engine/adapter.js
@@ -31,7 +31,7 @@ function domToBlocks (blocksDOM) {
         }
         var tagName = block.name.toLowerCase();
         if (tagName == 'block' || tagName == 'shadow') {
-            domToBlock(block, blocks, true);
+            domToBlock(block, blocks, true, null);
         }
     }
     // Flatten blocks object into a list.
@@ -48,8 +48,9 @@ function domToBlocks (blocksDOM) {
  * @param {Element} blockDOM DOM tree for an individual block.
  * @param {Object} blocks Collection of blocks to add to.
  * @param {Boolean} isTopBlock Whether blocks at this level are "top blocks."
+ * @param {?string} parent Parent block ID.
  */
-function domToBlock (blockDOM, blocks, isTopBlock) {
+function domToBlock (blockDOM, blocks, isTopBlock, parent) {
     // Block skeleton.
     var block = {
         id: blockDOM.attribs.id, // Block ID
@@ -58,6 +59,7 @@ function domToBlock (blockDOM, blocks, isTopBlock) {
         fields: {}, // Fields on this block and their values.
         next: null, // Next block in the stack, if one exists.
         topLevel: isTopBlock, // If this block starts a stack.
+        parent: parent, // Parent block ID, if available.
         shadow: blockDOM.name == 'shadow', // If this represents a shadow/slot.
         x: blockDOM.attribs.x, // X position of script, if top-level.
         y: blockDOM.attribs.y // Y position of script, if top-level.
@@ -113,10 +115,10 @@ function domToBlock (blockDOM, blocks, isTopBlock) {
         case 'value':
         case 'statement':
             // Recursively generate block structure for input block.
-            domToBlock(childBlockNode, blocks, false);
+            domToBlock(childBlockNode, blocks, false, block.id);
             if (childShadowNode && childBlockNode != childShadowNode) {
                 // Also generate the shadow block.
-                domToBlock(childShadowNode, blocks, false);
+                domToBlock(childShadowNode, blocks, false, block.id);
             }
             // Link this block's input to the child block.
             var inputName = xmlChild.attribs.name;
@@ -132,7 +134,7 @@ function domToBlock (blockDOM, blocks, isTopBlock) {
                 continue;
             }
             // Recursively generate block structure for next block.
-            domToBlock(childBlockNode, blocks, false);
+            domToBlock(childBlockNode, blocks, false, block.id);
             // Link next block to this block.
             block.next = childBlockNode.attribs.id;
             break;
diff --git a/src/engine/blocks.js b/src/engine/blocks.js
index a3d949a5..b3d87e49 100644
--- a/src/engine/blocks.js
+++ b/src/engine/blocks.js
@@ -1,4 +1,5 @@
 var adapter = require('./adapter');
+var xmlEscape = require('../util/xml-escape');
 
 /**
  * @fileoverview
@@ -115,6 +116,20 @@ Blocks.prototype.getInputs = function (id) {
     return inputs;
 };
 
+/**
+ * Get the top-level script for a given block.
+ * @param {?string} id ID of block to query.
+ * @return {?string} ID of top-level script block.
+ */
+Blocks.prototype.getTopLevelScript = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    var block = this._blocks[id];
+    while (block.parent !== null) {
+        block = this._blocks[block.parent];
+    }
+    return block.id;
+};
+
 // ---------------------------------------------------------------------
 
 /**
@@ -237,6 +252,7 @@ Blocks.prototype.moveBlock = function (e) {
             // This block was connected to the old parent's next connection.
             oldParent.next = null;
         }
+        this._blocks[e.id].parent = null;
     }
 
     // Has the block become a top-level block?
@@ -249,13 +265,20 @@ Blocks.prototype.moveBlock = function (e) {
         if (e.newInput !== undefined) {
             // Moved to the new parent's input.
             // Don't obscure the shadow block.
-            var newInput = this._blocks[e.newParent].inputs[e.newInput];
-            newInput.name = e.newInput;
-            newInput.block = e.id;
+            var oldShadow = null;
+            if (this._blocks[e.newParent].inputs.hasOwnProperty(e.newInput)) {
+                oldShadow = this._blocks[e.newParent].inputs[e.newInput].shadow;
+            }
+            this._blocks[e.newParent].inputs[e.newInput] = {
+                name: e.newInput,
+                block: e.id,
+                shadow: oldShadow
+            };
         } else {
             // Moved to the new parent's next connection.
             this._blocks[e.newParent].next = e.id;
         }
+        this._blocks[e.id].parent = e.newParent;
     }
 };
 
@@ -347,8 +370,12 @@ Blocks.prototype.blockToXML = function (blockId) {
     // Add any fields on this block.
     for (var field in block.fields) {
         var blockField = block.fields[field];
+        var value = blockField.value;
+        if (typeof value === 'string') {
+            value = xmlEscape(blockField.value);
+        }
         xmlString += '<field name="' + blockField.name + '">' +
-            blockField.value + '</field>';
+            value + '</field>';
     }
     // Add blocks connected to the next connection.
     if (block.next) {
diff --git a/src/engine/execute.js b/src/engine/execute.js
index 5efe9beb..2dfc075f 100644
--- a/src/engine/execute.js
+++ b/src/engine/execute.js
@@ -22,39 +22,91 @@ var execute = function (sequencer, thread) {
     var currentBlockId = thread.peekStack();
     var currentStackFrame = thread.peekStackFrame();
 
+    // Query info about the block.
     var opcode = target.blocks.getOpcode(currentBlockId);
+    var blockFunction = runtime.getOpcodeFunction(opcode);
+    var isHat = runtime.getIsHat(opcode);
+    var fields = target.blocks.getFields(currentBlockId);
+    var inputs = target.blocks.getInputs(currentBlockId);
 
     if (!opcode) {
         console.warn('Could not get opcode for block: ' + currentBlockId);
         return;
     }
 
-    var blockFunction = runtime.getOpcodeFunction(opcode);
-    var isHat = runtime.getIsHat(opcode);
+    /**
+     * Handle any reported value from the primitive, either directly returned
+     * or after a promise resolves.
+     * @param {*} resolvedValue Value eventually returned from the primitive.
+     */
+    var handleReport = function (resolvedValue) {
+        thread.pushReportedValue(resolvedValue);
+        if (isHat) {
+            // Hat predicate was evaluated.
+            if (runtime.getIsEdgeActivatedHat(opcode)) {
+                // If this is an edge-activated hat, only proceed if
+                // the value is true and used to be false.
+                var oldEdgeValue = runtime.updateEdgeActivatedValue(
+                    currentBlockId,
+                    resolvedValue
+                );
+                var edgeWasActivated = !oldEdgeValue && resolvedValue;
+                if (!edgeWasActivated) {
+                    sequencer.retireThread(thread);
+                }
+            } else {
+                // Not an edge-activated hat: retire the thread
+                // if predicate was false.
+                if (!resolvedValue) {
+                    sequencer.retireThread(thread);
+                }
+            }
+        } else {
+            // In a non-hat, report the value visually if necessary if
+            // at the top of the thread stack.
+            if (typeof resolvedValue !== 'undefined' && thread.atStackTop()) {
+                runtime.visualReport(currentBlockId, resolvedValue);
+            }
+            // Finished any yields.
+            thread.setStatus(Thread.STATUS_RUNNING);
+        }
+    };
 
-    // Hats are implemented slightly differently from regular blocks.
-    // If they have an associated block function, it's treated as a predicate;
-    // if not, execution will proceed right through it (as a no-op).
+    // Hats and single-field shadows are implemented slightly differently
+    // from regular blocks.
+    // For hats: if they have an associated block function,
+    // it's treated as a predicate; if not, execution will proceed as a no-op.
+    // For single-field shadows: If the block has a single field, and no inputs,
+    // immediately return the value of the field.
     if (!blockFunction) {
-        if (!isHat) {
-            console.warn('Could not get implementation for opcode: ' + opcode);
+        if (isHat) {
+            // Skip through the block (hat with no predicate).
+            return;
+        } else {
+            if (Object.keys(fields).length == 1 &&
+                Object.keys(inputs).length == 0) {
+                // One field and no inputs - treat as arg.
+                for (var fieldKey in fields) { // One iteration.
+                    handleReport(fields[fieldKey].value);
+                }
+            } else {
+                console.warn('Could not get implementation for opcode: ' +
+                    opcode);
+            }
+            thread.requestScriptGlowInFrame = true;
+            return;
         }
-        // Skip through the block.
-        // (either hat with no predicate, or missing op).
-        return;
     }
 
     // Generate values for arguments (inputs).
     var argValues = {};
 
     // Add all fields on this block to the argValues.
-    var fields = target.blocks.getFields(currentBlockId);
     for (var fieldName in fields) {
         argValues[fieldName] = fields[fieldName].value;
     }
 
     // Recursively evaluate input blocks.
-    var inputs = target.blocks.getInputs(currentBlockId);
     for (var inputName in inputs) {
         var input = inputs[inputName];
         var inputBlockId = input.block;
@@ -110,43 +162,11 @@ var execute = function (sequencer, thread) {
         }
     });
 
-    /**
-     * Handle any reported value from the primitive, either directly returned
-     * or after a promise resolves.
-     * @param {*} resolvedValue Value eventually returned from the primitive.
-     */
-    var handleReport = function (resolvedValue) {
-        thread.pushReportedValue(resolvedValue);
-        if (isHat) {
-            // Hat predicate was evaluated.
-            if (runtime.getIsEdgeActivatedHat(opcode)) {
-                // If this is an edge-activated hat, only proceed if
-                // the value is true and used to be false.
-                var oldEdgeValue = runtime.updateEdgeActivatedValue(
-                    currentBlockId,
-                    resolvedValue
-                );
-                var edgeWasActivated = !oldEdgeValue && resolvedValue;
-                if (!edgeWasActivated) {
-                    sequencer.retireThread(thread);
-                }
-            } else {
-                // Not an edge-activated hat: retire the thread
-                // if predicate was false.
-                if (!resolvedValue) {
-                    sequencer.retireThread(thread);
-                }
-            }
-        } else {
-            // In a non-hat, report the value visually if necessary if
-            // at the top of the thread stack.
-            if (typeof resolvedValue !== 'undefined' && thread.atStackTop()) {
-                runtime.visualReport(currentBlockId, resolvedValue);
-            }
-            // Finished any yields.
-            thread.setStatus(Thread.STATUS_RUNNING);
-        }
-    };
+    if (typeof primitiveReportedValue === 'undefined') {
+        // No value reported - potentially a command block.
+        // Edge-activated hats don't request a glow; all commands do.
+        thread.requestScriptGlowInFrame = true;
+    }
 
     // If it's a promise, wait until promise resolves.
     if (isPromise(primitiveReportedValue)) {
diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index 66eee963..591c94e4 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -56,30 +56,33 @@ function Runtime () {
     this.ioDevices = {
         'clock': new Clock(),
         'keyboard': new Keyboard(this),
-        'mouse': new Mouse()
+        'mouse': new Mouse(this)
     };
+
+    this._scriptGlowsPreviousFrame = [];
+    this._editingTarget = null;
 }
 
 /**
- * Event name for glowing a stack
+ * Event name for glowing a script.
  * @const {string}
  */
-Runtime.STACK_GLOW_ON = 'STACK_GLOW_ON';
+Runtime.SCRIPT_GLOW_ON = 'STACK_GLOW_ON';
 
 /**
- * Event name for unglowing a stack
+ * Event name for unglowing a script.
  * @const {string}
  */
-Runtime.STACK_GLOW_OFF = 'STACK_GLOW_OFF';
+Runtime.SCRIPT_GLOW_OFF = 'STACK_GLOW_OFF';
 
 /**
- * Event name for glowing a block
+ * Event name for glowing a block.
  * @const {string}
  */
 Runtime.BLOCK_GLOW_ON = 'BLOCK_GLOW_ON';
 
 /**
- * Event name for unglowing a block
+ * Event name for unglowing a block.
  * @const {string}
  */
 Runtime.BLOCK_GLOW_OFF = 'BLOCK_GLOW_OFF';
@@ -197,7 +200,6 @@ Runtime.prototype.clearEdgeActivatedValues = function () {
  */
 Runtime.prototype._pushThread = function (id) {
     var thread = new Thread(id);
-    this.glowScript(id, true);
     thread.pushStack(id);
     this.threads.push(thread);
     return thread;
@@ -210,7 +212,6 @@ Runtime.prototype._pushThread = function (id) {
 Runtime.prototype._removeThread = function (thread) {
     var i = this.threads.indexOf(thread);
     if (i > -1) {
-        this.glowScript(thread.topBlock, false);
         this.threads.splice(i, 1);
     }
 };
@@ -342,11 +343,6 @@ Runtime.prototype.stopAll = function () {
     var threadsCopy = this.threads.slice();
     while (threadsCopy.length > 0) {
         var poppedThread = threadsCopy.pop();
-        // Unglow any blocks on this thread's stack.
-        for (var i = 0; i < poppedThread.stack.length; i++) {
-            this.glowBlock(poppedThread.stack[i], false);
-        }
-        // Actually remove the thread.
         this._removeThread(poppedThread);
     }
 };
@@ -364,11 +360,55 @@ Runtime.prototype._step = function () {
         }
     }
     var inactiveThreads = this.sequencer.stepThreads(this.threads);
+    this._updateScriptGlows();
     for (var i = 0; i < inactiveThreads.length; i++) {
         this._removeThread(inactiveThreads[i]);
     }
 };
 
+Runtime.prototype.setEditingTarget = function (editingTarget) {
+    this._scriptGlowsPreviousFrame = [];
+    this._editingTarget = editingTarget;
+    this._updateScriptGlows();
+};
+
+Runtime.prototype._updateScriptGlows = function () {
+    // Set of scripts that request a glow this frame.
+    var requestedGlowsThisFrame = [];
+    // Final set of scripts glowing during this frame.
+    var finalScriptGlows = [];
+    // Find all scripts that should be glowing.
+    for (var i = 0; i < this.threads.length; i++) {
+        var thread = this.threads[i];
+        var target = this.targetForThread(thread);
+        if (thread.requestScriptGlowInFrame && target == this._editingTarget) {
+            var blockForThread = thread.peekStack() || thread.topBlock;
+            var script = target.blocks.getTopLevelScript(blockForThread);
+            requestedGlowsThisFrame.push(script);
+        }
+    }
+    // Compare to previous frame.
+    for (var j = 0; j < this._scriptGlowsPreviousFrame.length; j++) {
+        var previousFrameGlow = this._scriptGlowsPreviousFrame[j];
+        if (requestedGlowsThisFrame.indexOf(previousFrameGlow) < 0) {
+            // Glow turned off.
+            this.glowScript(previousFrameGlow, false);
+        } else {
+            // Still glowing.
+            finalScriptGlows.push(previousFrameGlow);
+        }
+    }
+    for (var k = 0; k < requestedGlowsThisFrame.length; k++) {
+        var currentFrameGlow = requestedGlowsThisFrame[k];
+        if (this._scriptGlowsPreviousFrame.indexOf(currentFrameGlow) < 0) {
+            // Glow turned on.
+            this.glowScript(currentFrameGlow, true);
+            finalScriptGlows.push(currentFrameGlow);
+        }
+    }
+    this._scriptGlowsPreviousFrame = finalScriptGlows;
+};
+
 /**
  * Emit feedback for block glowing (used in the sequencer).
  * @param {?string} blockId ID for the block to update glow
@@ -389,9 +429,9 @@ Runtime.prototype.glowBlock = function (blockId, isGlowing) {
  */
 Runtime.prototype.glowScript = function (topBlockId, isGlowing) {
     if (isGlowing) {
-        this.emit(Runtime.STACK_GLOW_ON, topBlockId);
+        this.emit(Runtime.SCRIPT_GLOW_ON, topBlockId);
     } else {
-        this.emit(Runtime.STACK_GLOW_OFF, topBlockId);
+        this.emit(Runtime.SCRIPT_GLOW_OFF, topBlockId);
     }
 };
 
@@ -435,6 +475,19 @@ Runtime.prototype.getTargetById = function (targetId) {
     }
 };
 
+/**
+ * Get a target representing the Scratch stage, if one exists.
+ * @return {?Target} The target, if found.
+ */
+Runtime.prototype.getTargetForStage = function () {
+    for (var i = 0; i < this.targets.length; i++) {
+        var target = this.targets[i];
+        if (target.isStage) {
+            return target;
+        }
+    }
+};
+
 /**
  * Handle an animation frame from the main thread.
  */
diff --git a/src/engine/thread.js b/src/engine/thread.js
index 07a98b86..0dc98270 100644
--- a/src/engine/thread.js
+++ b/src/engine/thread.js
@@ -28,6 +28,12 @@ function Thread (firstBlock) {
      * @type {number}
      */
     this.status = 0; /* Thread.STATUS_RUNNING */
+
+    /**
+     * Whether the thread requests its script to glow during this frame.
+     * @type {boolean}
+     */
+    this.requestScriptGlowInFrame = false;
 }
 
 /**
diff --git a/src/import/sb2import.js b/src/import/sb2import.js
index 07eb831b..494f528c 100644
--- a/src/import/sb2import.js
+++ b/src/import/sb2import.js
@@ -20,7 +20,8 @@ var specMap = require('./sb2specmap');
 function sb2import (json, runtime) {
     parseScratchObject(
         JSON.parse(json),
-        runtime
+        runtime,
+        true
     );
 }
 
@@ -28,8 +29,9 @@ function sb2import (json, runtime) {
  * Parse a single "Scratch object" and create all its in-memory VM objects.
  * @param {!Object} object From-JSON "Scratch object:" sprite, stage, watcher.
  * @param {!Runtime} runtime Runtime object to load all structures into.
+ * @param {boolean} topLevel Whether this is the top-level object (stage).
  */
-function parseScratchObject (object, runtime) {
+function parseScratchObject (object, runtime, topLevel) {
     if (!object.hasOwnProperty('objName')) {
         // Watcher/monitor - skip this object until those are implemented in VM.
         // @todo
@@ -49,7 +51,8 @@ function parseScratchObject (object, runtime) {
             var costume = object.costumes[i];
             // @todo: Make sure all the relevant metadata is being pulled out.
             sprite.costumes.push({
-                skin: costume.baseLayerMD5,
+                skin: 'https://cdn.assets.scratch.mit.edu/internalapi/asset/' 
+                    + costume.baseLayerMD5 + '/get/',
                 name: costume.costumeName,
                 bitmapResolution: costume.bitmapResolution,
                 rotationCenterX: costume.rotationCenterX,
@@ -84,10 +87,11 @@ function parseScratchObject (object, runtime) {
     if (object.currentCostumeIndex) {
         target.currentCostume = object.currentCostumeIndex;
     }
+    target.isStage = topLevel;
     // The stage will have child objects; recursively process them.
     if (object.children) {
         for (var j = 0; j < object.children.length; j++) {
-            parseScratchObject(object.children[j], runtime);
+            parseScratchObject(object.children[j], runtime, false);
         }
     }
 }
@@ -112,6 +116,7 @@ function parseScripts (scripts, blocks) {
             parsedBlockList[0].x = scriptX * 1.1;
             parsedBlockList[0].y = scriptY * 1.1;
             parsedBlockList[0].topLevel = true;
+            parsedBlockList[0].parent = null;
         }
         // Flatten children and create add the blocks.
         var convertedBlocks = flatten(parsedBlockList);
@@ -136,6 +141,7 @@ function parseBlockList (blockList) {
         var block = blockList[i];
         var parsedBlock = parseBlock(block);
         if (previousBlock) {
+            parsedBlock.parent = previousBlock.id;
             previousBlock.next = parsedBlock.id;
         }
         previousBlock = parsedBlock;
@@ -214,6 +220,9 @@ function parseBlock (sb2block) {
                     // Single block occupies the input.
                     innerBlocks = [parseBlock(providedArg)];
                 }
+                for (var j = 0; j < innerBlocks.length; j++) {
+                    innerBlocks[j].parent = activeBlock.id;
+                }
                 // Obscures any shadow.
                 shadowObscured = true;
                 activeBlock.inputs[expectedArg.inputName].block = (
@@ -250,7 +259,7 @@ function parseBlock (sb2block) {
                 }
             } else if (expectedArg.inputOp == 'colour_picker') {
                 // Convert SB2 color to hex.
-                fieldValue = Color.scratchColorToHex(providedArg);
+                fieldValue = Color.decimalToHex(providedArg);
                 fieldName = 'COLOUR';
                 if (shadowObscured) {
                     fieldValue = '#990000';
@@ -268,6 +277,7 @@ function parseBlock (sb2block) {
                 fields: fields,
                 next: null,
                 topLevel: false,
+                parent: activeBlock.id,
                 shadow: true
             });
             activeBlock.inputs[expectedArg.inputName].shadow = inputUid;
diff --git a/src/index.js b/src/index.js
index 34f10eaa..6784dc88 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,13 +4,8 @@ var util = require('util');
 var Runtime = require('./engine/runtime');
 var sb2import = require('./import/sb2import');
 
-var AudioWorker = require('../audioWorker');
-
-/**
- * Whether the environment is a WebWorker.
- * @const{boolean}
- */
-var ENV_WORKER = typeof importScripts === 'function';
+var Sprite = require('./sprites/sprite');
+var Blocks = require('./engine/blocks');
 
 /**
  * Handles connections between blocks, stage, and extensions.
@@ -33,11 +28,11 @@ function VirtualMachine () {
      */
     instance.editingTarget = null;
     // Runtime emits are passed along as VM emits.
-    instance.runtime.on(Runtime.STACK_GLOW_ON, function (id) {
-        instance.emit(Runtime.STACK_GLOW_ON, {id: id});
+    instance.runtime.on(Runtime.SCRIPT_GLOW_ON, function (id) {
+        instance.emit(Runtime.SCRIPT_GLOW_ON, {id: id});
     });
-    instance.runtime.on(Runtime.STACK_GLOW_OFF, function (id) {
-        instance.emit(Runtime.STACK_GLOW_OFF, {id: id});
+    instance.runtime.on(Runtime.SCRIPT_GLOW_OFF, function (id) {
+        instance.emit(Runtime.SCRIPT_GLOW_OFF, {id: id});
     });
     instance.runtime.on(Runtime.BLOCK_GLOW_ON, function (id) {
         instance.emit(Runtime.BLOCK_GLOW_ON, {id: id});
@@ -48,6 +43,8 @@ function VirtualMachine () {
     instance.runtime.on(Runtime.VISUAL_REPORT, function (id, value) {
         instance.emit(Runtime.VISUAL_REPORT, {id: id, value: value});
     });
+
+    this.blockListener = this.blockListener.bind(this);
 }
 
 /**
@@ -106,7 +103,7 @@ VirtualMachine.prototype.postIOData = function (device, data) {
 
 /**
  * Load a project from a Scratch 2.0 JSON representation.
- * @param {string} json JSON string representing the project.
+ * @param {?string} json JSON string representing the project.
  */
 VirtualMachine.prototype.loadProject = function (json) {
     // @todo: Handle other formats, e.g., Scratch 1.4, Scratch 3.0.
@@ -116,6 +113,68 @@ VirtualMachine.prototype.loadProject = function (json) {
     // Update the VM user's knowledge of targets and blocks on the workspace.
     this.emitTargetsUpdate();
     this.emitWorkspaceUpdate();
+    this.runtime.setEditingTarget(this.editingTarget);
+};
+
+/**
+ * Temporary way to make an empty project, in case the desired project
+ * cannot be loaded from the online server.
+ */
+VirtualMachine.prototype.createEmptyProject = function () {
+    // Stage.
+    var blocks2 = new Blocks();
+    var stage = new Sprite(blocks2);
+    stage.name = 'Stage';
+    stage.costumes.push({
+        skin: '/assets/stage.png',
+        name: 'backdrop1',
+        bitmapResolution: 1,
+        rotationCenterX: 240,
+        rotationCenterY: 180
+    });
+    var target2 = stage.createClone();
+    this.runtime.targets.push(target2);
+    target2.x = 0;
+    target2.y = 0;
+    target2.direction = 90;
+    target2.size = 200;
+    target2.visible = true;
+    target2.isStage = true;
+    // Sprite1 (cat).
+    var blocks1 = new Blocks();
+    var sprite = new Sprite(blocks1);
+    sprite.name = 'Sprite1';
+    sprite.costumes.push({
+        skin: '/assets/scratch_cat.svg',
+        name: 'costume1',
+        bitmapResolution: 1,
+        rotationCenterX: 47,
+        rotationCenterY: 55
+    });
+    var target1 = sprite.createClone();
+    this.runtime.targets.push(target1);
+    target1.x = 0;
+    target1.y = 0;
+    target1.direction = 90;
+    target1.size = 100;
+    target1.visible = true;
+    this.editingTarget = this.runtime.targets[0];
+    this.emitTargetsUpdate();
+    this.emitWorkspaceUpdate();
+};
+
+/**
+ * Handle a Blockly event for the current editing target.
+ * @param {!Blockly.Event} e Any Blockly event.
+ */
+VirtualMachine.prototype.blockListener = function (e) {
+    if (this.editingTarget) {
+        this.editingTarget.blocks.blocklyListen(
+            e,
+            false,
+            this.runtime
+        );
+    }
 };
 
 /**
@@ -137,6 +196,7 @@ VirtualMachine.prototype.setEditingTarget = function (targetId) {
         // Emit appropriate UI updates.
         this.emitTargetsUpdate();
         this.emitWorkspaceUpdate();
+        this.runtime.setEditingTarget(target);
     }
 };
 
@@ -166,104 +226,6 @@ VirtualMachine.prototype.emitWorkspaceUpdate = function () {
     });
 };
 
-/*
- * Worker handlers: for all public methods available above,
- * we must also provide a message handler in case the VM is run
- * from a worker environment.
- */
-if (ENV_WORKER) {
-    self.importScripts(
-        './node_modules/scratch-render/render-worker.js'
-    );
-    self.renderer = new self.RenderWebGLWorker();
-    self.audioWorker = new AudioWorker();
-    self.vmInstance = new VirtualMachine();
-    self.onmessage = function (e) {
-        var messageData = e.data;
-        switch (messageData.method) {
-        case 'start':
-            self.vmInstance.runtime.start();
-            break;
-        case 'greenFlag':
-            self.vmInstance.runtime.greenFlag();
-            break;
-        case 'stopAll':
-            self.vmInstance.runtime.stopAll();
-            break;
-        case 'blockListener':
-            if (self.vmInstance.editingTarget) {
-                self.vmInstance.editingTarget.blocks.blocklyListen(
-                    messageData.args,
-                    false,
-                    self.vmInstance.runtime
-                );
-            }
-            break;
-        case 'flyoutBlockListener':
-            if (self.vmInstance.editingTarget) {
-                self.vmInstance.editingTarget.blocks.blocklyListen(
-                    messageData.args,
-                    true,
-                    self.vmInstance.runtime
-                );
-            }
-            break;
-        case 'getPlaygroundData':
-            self.postMessage({
-                method: 'playgroundData',
-                blocks: self.vmInstance.editingTarget.blocks,
-                threads: self.vmInstance.runtime.threads
-            });
-            break;
-        case 'animationFrame':
-            self.vmInstance.animationFrame();
-            break;
-        case 'postIOData':
-            self.vmInstance.postIOData(messageData.device, messageData.data);
-            break;
-        case 'setEditingTarget':
-            self.vmInstance.setEditingTarget(messageData.targetId);
-            break;
-        case 'loadProject':
-            self.vmInstance.loadProject(messageData.json);
-            break;
-        default:
-            if (e.data.id == 'RendererConnected') {
-                //initRenderWorker();
-            }
-            self.renderer.onmessage(e);
-            break;
-        }
-    };
-    // Bind runtime's emitted events to postmessages.
-    self.vmInstance.runtime.on(Runtime.STACK_GLOW_ON, function (id) {
-        self.postMessage({method: Runtime.STACK_GLOW_ON, id: id});
-    });
-    self.vmInstance.runtime.on(Runtime.STACK_GLOW_OFF, function (id) {
-        self.postMessage({method: Runtime.STACK_GLOW_OFF, id: id});
-    });
-    self.vmInstance.runtime.on(Runtime.BLOCK_GLOW_ON, function (id) {
-        self.postMessage({method: Runtime.BLOCK_GLOW_ON, id: id});
-    });
-    self.vmInstance.runtime.on(Runtime.BLOCK_GLOW_OFF, function (id) {
-        self.postMessage({method: Runtime.BLOCK_GLOW_OFF, id: id});
-    });
-    self.vmInstance.runtime.on(Runtime.VISUAL_REPORT, function (id, value) {
-        self.postMessage({method: Runtime.VISUAL_REPORT, id: id, value: value});
-    });
-    self.vmInstance.on('workspaceUpdate', function(data) {
-        self.postMessage({method: 'workspaceUpdate',
-            xml: data.xml
-        });
-    });
-    self.vmInstance.on('targetsUpdate', function(data) {
-        self.postMessage({method: 'targetsUpdate',
-            targetList: data.targetList,
-            editingTarget: data.editingTarget
-        });
-    });
-}
-
 /**
  * Export and bind to `window`
  */
diff --git a/src/io/keyboard.js b/src/io/keyboard.js
index dc0f2dc7..ea423fd4 100644
--- a/src/io/keyboard.js
+++ b/src/io/keyboard.js
@@ -44,10 +44,10 @@ Keyboard.prototype._keyCodeToScratchKey = function (keyCode) {
     }
     switch (keyCode) {
     case 32: return 'space';
-    case 37: return 'leftarrow';
-    case 38: return 'uparrow';
-    case 39: return 'rightarrow';
-    case 40: return 'downarrow';
+    case 37: return 'left arrow';
+    case 38: return 'up arrow';
+    case 39: return 'right arrow';
+    case 40: return 'down arrow';
     }
     return null;
 };
@@ -59,17 +59,14 @@ Keyboard.prototype.postData = function (data) {
             // If not already present, add to the list.
             if (index < 0) {
                 this._keysPressed.push(data.keyCode);
-                this.runtime.startHats('event_whenkeypressed',
-                    {
-                        'KEY_OPTION': this._keyCodeToScratchKey(data.keyCode)
-                                          .toUpperCase()
-                    });
-
-                this.runtime.startHats('event_whenkeypressed',
-                    {
-                        'KEY_OPTION': 'ANY'
-                    });
             }
+            // Always trigger hats, even if it was already pressed.
+            this.runtime.startHats('event_whenkeypressed', {
+                'KEY_OPTION': this._keyCodeToScratchKey(data.keyCode)
+            });
+            this.runtime.startHats('event_whenkeypressed', {
+                'KEY_OPTION': 'any'
+            });
         } else if (index > -1) {
             // If already present, remove from the list.
             this._keysPressed.splice(index, 1);
diff --git a/src/io/mouse.js b/src/io/mouse.js
index 7432c435..990ba96f 100644
--- a/src/io/mouse.js
+++ b/src/io/mouse.js
@@ -1,20 +1,47 @@
 var MathUtil = require('../util/math-util');
 
-function Mouse () {
+function Mouse (runtime) {
     this._x = 0;
     this._y = 0;
     this._isDown = false;
+    /**
+     * Reference to the owning Runtime.
+     * Can be used, for example, to activate hats.
+     * @type{!Runtime}
+     */
+    this.runtime = runtime;
 }
 
 Mouse.prototype.postData = function(data) {
     if (data.x) {
-        this._x = data.x;
+        this._x = data.x - data.canvasWidth / 2;
     }
     if (data.y) {
-        this._y = data.y;
+        this._y = data.y - data.canvasHeight / 2;
     }
     if (typeof data.isDown !== 'undefined') {
         this._isDown = data.isDown;
+        if (this._isDown) {
+            this._activateClickHats(data.x, data.y);
+        }
+    }
+};
+
+Mouse.prototype._activateClickHats = function (x, y) {
+    if (self.renderer) {
+        var pickPromise = self.renderer.pick(x, y);
+        var instance = this;
+        pickPromise.then(function(drawableID) {
+            for (var i = 0; i < instance.runtime.targets.length; i++) {
+                var target = instance.runtime.targets[i];
+                if (target.hasOwnProperty('drawableID') &&
+                    target.drawableID == drawableID) {
+                    instance.runtime.startHats('event_whenthisspriteclicked',
+                        null, target);
+                    return;
+                }
+            }
+        });
     }
 };
 
diff --git a/src/sprites/clone.js b/src/sprites/clone.js
index 523a00fd..8c7f79b9 100644
--- a/src/sprites/clone.js
+++ b/src/sprites/clone.js
@@ -53,6 +53,12 @@ Clone.prototype.initDrawable = function () {
 };
 
 // Clone-level properties.
+/**
+ * Whether this clone represents the Scratch stage.
+ * @type {boolean}
+ */
+Clone.prototype.isStage = false;
+
 /**
  * Scratch X coordinate. Currently should range from -240 to 240.
  * @type {Number}
@@ -110,6 +116,9 @@ Clone.prototype.effects = {
  * @param {!number} y New Y coordinate of clone, in Scratch coordinates.
  */
 Clone.prototype.setXY = function (x, y) {
+    if (this.isStage) {
+        return;
+    }
     this.x = x;
     this.y = y;
     if (this.renderer) {
@@ -124,6 +133,9 @@ Clone.prototype.setXY = function (x, y) {
  * @param {!number} direction New direction of clone.
  */
 Clone.prototype.setDirection = function (direction) {
+    if (this.isStage) {
+        return;
+    }
     // Keep direction between -179 and +180.
     this.direction = MathUtil.wrapClamp(direction, -179, 180);
     if (this.renderer) {
@@ -139,6 +151,9 @@ Clone.prototype.setDirection = function (direction) {
  * @param {?string} message Message to put in say bubble.
  */
 Clone.prototype.setSay = function (type, message) {
+    if (this.isStage) {
+        return;
+    }
     // @todo: Render to stage.
     if (!type || !message) {
         console.log('Clearing say bubble');
@@ -152,6 +167,9 @@ Clone.prototype.setSay = function (type, message) {
  * @param {!boolean} visible True if the sprite should be shown.
  */
 Clone.prototype.setVisible = function (visible) {
+    if (this.isStage) {
+        return;
+    }
     this.visible = visible;
     if (this.renderer) {
         this.renderer.updateDrawableProperties(this.drawableID, {
@@ -165,6 +183,9 @@ Clone.prototype.setVisible = function (visible) {
  * @param {!number} size Size of clone, from 5 to 535.
  */
 Clone.prototype.setSize = function (size) {
+    if (this.isStage) {
+        return;
+    }
     // Keep size between 5% and 535%.
     this.size = MathUtil.clamp(size, 5, 535);
     if (this.renderer) {
@@ -180,6 +201,7 @@ Clone.prototype.setSize = function (size) {
  * @param {!number} value Numerical magnitude of effect.
  */
 Clone.prototype.setEffect = function (effectName, value) {
+    if (!this.effects.hasOwnProperty(effectName)) return;
     this.effects[effectName] = value;
     if (this.renderer) {
         var props = {};
@@ -205,7 +227,10 @@ Clone.prototype.clearEffects = function () {
  * @param {number} index New index of costume.
  */
 Clone.prototype.setCostume = function (index) {
-    this.currentCostume = index;
+    // Keep the costume index within possible values.
+    this.currentCostume = MathUtil.wrapClamp(
+        index, 0, this.sprite.costumes.length - 1
+    );
     if (this.renderer) {
         this.renderer.updateDrawableProperties(this.drawableID, {
             skin: this.sprite.costumes[this.currentCostume].skin
@@ -213,6 +238,20 @@ Clone.prototype.setCostume = function (index) {
     }
 };
 
+/**
+ * Get a costume index of this clone, by name of the costume.
+ * @param {?string} costumeName Name of a costume.
+ * @return {number} Index of the named costume, or -1 if not present.
+ */
+Clone.prototype.getCostumeIndexByName = function (costumeName) {
+    for (var i = 0; i < this.sprite.costumes.length; i++) {
+        if (this.sprite.costumes[i].name == costumeName) {
+            return i;
+        }
+    }
+    return -1;
+};
+
 /**
  * Update all drawable properties for this clone.
  * Use when a batch has changed, e.g., when the drawable is first created.
@@ -252,4 +291,33 @@ Clone.prototype.playNoteForBeats = function (note,beats) {
     this.audioWorker.playNoteForBeats(note, beats);
 }
 
+/**
+ * Return whether the clone is touching a color.
+ * @param {Array.<number>} rgb [r,g,b], values between 0-255.
+ * @return {Promise.<Boolean>} True iff the clone is touching the color.
+ */
+Clone.prototype.isTouchingColor = function (rgb) {
+    if (this.renderer) {
+        return this.renderer.isTouchingColor(this.drawableID, rgb);
+    }
+    return false;
+};
+
+/**
+ * Return whether the clone's color is touching a color.
+ * @param {Object} targetRgb {Array.<number>} [r,g,b], values between 0-255.
+ * @param {Object} maskRgb {Array.<number>} [r,g,b], values between 0-255.
+ * @return {Promise.<Boolean>} True iff the clone's color is touching the color.
+ */
+Clone.prototype.colorIsTouchingColor = function (targetRgb, maskRgb) {
+    if (this.renderer) {
+        return this.renderer.isTouchingColor(
+            this.drawableID,
+            targetRgb,
+            maskRgb
+        );
+    }
+    return false;
+};
+
 module.exports = Clone;
diff --git a/src/util/cast.js b/src/util/cast.js
index 1f84663a..8c1e534a 100644
--- a/src/util/cast.js
+++ b/src/util/cast.js
@@ -1,3 +1,5 @@
+var Color = require('../util/color');
+
 function Cast () {}
 
 /**
@@ -63,6 +65,21 @@ Cast.toString = function (value) {
     return String(value);
 };
 
+/**
+ * Cast any Scratch argument to an RGB color object to be used for the renderer.
+ * @param {*} value Value to convert to RGB color object.
+ * @return {Array.<number>} [r,g,b], values between 0-255.
+ */
+Cast.toRgbColorList = function (value) {
+    var color;
+    if (typeof value == 'string' && value.substring(0, 1) == '#') {
+        color = Color.hexToRgb(value);
+    } else {
+        color = Color.decimalToRgb(Cast.toNumber(value));
+    }
+    return [color.r, color.g, color.b];
+};
+
 /**
  * Compare two values, using Scratch cast, case-insensitive string compare, etc.
  * In Scratch 2.0, this is captured by `interp.compare.`
diff --git a/src/util/color.js b/src/util/color.js
index 81fe8b01..2635c1b6 100644
--- a/src/util/color.js
+++ b/src/util/color.js
@@ -1,17 +1,76 @@
 function Color () {}
 
 /**
- * Convert a Scratch color number to a hex string, #RRGGBB.
- * @param {number} color RGB color as a decimal.
+ * Convert a Scratch decimal color to a hex string, #RRGGBB.
+ * @param {number} decimal RGB color as a decimal.
  * @return {string} RGB color as #RRGGBB hex string.
  */
-Color.scratchColorToHex = function (color) {
-    if (color < 0) {
-        color += 0xFFFFFF + 1;
+Color.decimalToHex = function (decimal) {
+    if (decimal < 0) {
+        decimal += 0xFFFFFF + 1;
     }
-    var hex = Number(color).toString(16);
+    var hex = Number(decimal).toString(16);
     hex = '#' + '000000'.substr(0, 6 - hex.length) + hex;
     return hex;
 };
 
+/**
+ * Convert a Scratch decimal color to an RGB color object.
+ * @param {number} decimal RGB color as decimal.
+ * @returns {Object} {r: R, g: G, b: B}, values between 0-255
+ */
+Color.decimalToRgb = function (decimal) {
+    var r = (decimal >> 16) & 0xFF;
+    var g = (decimal >> 8) & 0xFF;
+    var b = decimal & 0xFF;
+    return {r: r, g: g, b: b};
+};
+
+/**
+ * Convert a hex color (e.g., F00, #03F, #0033FF) to an RGB color object.
+ * CC-BY-SA Tim Down:
+ * https://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
+ * @param {!string} hex Hex representation of the color.
+ * @return {Object} {r: R, g: G, b: B}, 0-255, or null.
+ */
+Color.hexToRgb = function (hex) {
+    var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
+    hex = hex.replace(shorthandRegex, function(m, r, g, b) {
+        return r + r + g + g + b + b;
+    });
+    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+    return result ? {
+        r: parseInt(result[1], 16),
+        g: parseInt(result[2], 16),
+        b: parseInt(result[3], 16)
+    } : null;
+};
+
+/**
+ * Convert an RGB color object to a hex color.
+ * @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
+ * @return {!string} Hex representation of the color.
+ */
+Color.rgbToHex = function (rgb) {
+    return Color.decimalToHex(Color.rgbToDecimal(rgb));
+};
+
+/**
+ * Convert an RGB color object to a Scratch decimal color.
+ * @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
+ * @return {!number} Number representing the color.
+ */
+Color.rgbToDecimal = function (rgb) {
+    return (rgb.r << 16) + (rgb.g << 8) + rgb.b;
+};
+
+/**
+* Convert a hex color (e.g., F00, #03F, #0033FF) to a decimal color number.
+* @param {!string} hex Hex representation of the color.
+* @return {!number} Number representing the color.
+*/
+Color.hexToDecimal = function (hex) {
+    return Color.rgbToDecimal(Color.hexToRgb(hex));
+};
+
 module.exports = Color;
diff --git a/src/util/timer.js b/src/util/timer.js
index 10a5b324..48dd223d 100644
--- a/src/util/timer.js
+++ b/src/util/timer.js
@@ -1,20 +1,70 @@
 /**
- * Constructor
+ * @fileoverview
+ * A utility for accurately measuring time.
+ * To use:
+ * ---
+ * var timer = new Timer();
+ * timer.start();
+ * ... pass some time ...
+ * var timeDifference = timer.timeElapsed();
+ * ---
+ * Or, you can use the `time` and `relativeTime`
+ * to do some measurement yourself.
  */
-function Timer () {
-    this.startTime = 0;
-}
 
+/**
+ * @constructor
+ */
+function Timer () {}
+
+/**
+ * Used to store the start time of a timer action.
+ * Updated when calling `timer.start`.
+ */
+Timer.prototype.startTime = 0;
+
+/**
+ * Return the currently known absolute time, in ms precision.
+ * @returns {number} ms elapsed since 1 January 1970 00:00:00 UTC.
+ */
 Timer.prototype.time = function () {
-    return Date.now();
+    if (Date.now) {
+        return Date.now();
+    } else {
+        return new Date().getTime();
+    }
 };
 
+/**
+ * Returns a time accurate relative to other times produced by this function.
+ * If possible, will use sub-millisecond precision.
+ * If not, will use millisecond precision.
+ * Not guaranteed to produce the same absolute values per-system.
+ * @returns {number} ms-scale accurate time relative to other relative times.
+ */
+Timer.prototype.relativeTime = function () {
+    if (typeof self !== 'undefined' &&
+        self.performance && 'now' in self.performance) {
+        return self.performance.now();
+    } else {
+        return this.time();
+    }
+};
+
+/**
+ * Start a timer for measuring elapsed time,
+ * at the most accurate precision possible.
+ */
 Timer.prototype.start = function () {
-    this.startTime = this.time();
+    this.startTime = this.relativeTime();
 };
 
+/**
+ * Check time elapsed since `timer.start` was called.
+ * @returns {number} Time elapsed, in ms (possibly sub-ms precision).
+ */
 Timer.prototype.timeElapsed = function () {
-    return this.time() - this.startTime;
+    return this.relativeTime() - this.startTime;
 };
 
 module.exports = Timer;
diff --git a/src/util/xml-escape.js b/src/util/xml-escape.js
new file mode 100644
index 00000000..00ce5bff
--- /dev/null
+++ b/src/util/xml-escape.js
@@ -0,0 +1,21 @@
+/**
+ * Escape a string to be safe to use in XML content.
+ * CC-BY-SA: hgoebl
+ * https://stackoverflow.com/questions/7918868/
+ * how-to-escape-xml-entities-in-javascript
+ * @param {!string} unsafe Unsafe string.
+ * @return {string} XML-escaped string, for use within an XML tag.
+ */
+var xmlEscape = function (unsafe) {
+    return unsafe.replace(/[<>&'"]/g, function (c) {
+        switch (c) {
+        case '<': return '&lt;';
+        case '>': return '&gt;';
+        case '&': return '&amp;';
+        case '\'': return '&apos;';
+        case '"': return '&quot;';
+        }
+    });
+};
+
+module.exports = xmlEscape;
diff --git a/src/worker.js b/src/worker.js
deleted file mode 100644
index 9f2b93ec..00000000
--- a/src/worker.js
+++ /dev/null
@@ -1,276 +0,0 @@
-var EventEmitter = require('events');
-var util = require('util');
-// var Tone = require('tone');
-
-function VirtualMachine () {
-    if (!window.Worker) {
-        console.error('WebWorkers not supported in this environment.' +
-            ' Please use the non-worker version (vm.js or vm.min.js).');
-        return;
-    }
-    var instance = this;
-    EventEmitter.call(instance);
-    instance.vmWorker = new Worker('../vm.js');
-
-/*
-	// MUSIC STUFF by ericr
-
-    // tone setup
-    
-    var tone = new Tone();
-
-    Tone.Transport.start();
-
-    // var quantizeUnit = '@8n';
-    var quantizeUnit = '+0';
-
-    // effects 
-
-    var delay = new Tone.FeedbackDelay(0.25, 0.5);
-    delay.wet.value = 0;
-    
-    var pitchShift = new Tone.PitchShift();
-
-    var panner = new Tone.Panner();
-
-    var reverb = new Tone.Freeverb();
-    reverb.wet.value = 0;
-
-    Tone.Master.chain(delay, pitchShift, panner, reverb);
-
-    // synth setup for play note block
-    
-	var synth = new Tone.PolySynth(6, Tone.Synth).toMaster();
-	
-    // drum sounds
-
-    var drumFileNames = ['high_conga', 'small_cowbell', 'snare_drum', 'splash cymbal'];
-    var drumSamplers = loadSoundFiles(drumFileNames);
-
-    // sounds
-
-    var soundFileNames = ['meow','boing','this_is_a_test','who_put_the_bomp','cave','drip_drop','drum_machine','eggs','zoop'];
-    var soundSamplers = loadSoundFiles(soundFileNames);
-
-    // polyphonic samplers
-
-    function loadSoundFiles(filenames) {
-        var samplers = [];
-        
-        for (var name of filenames) {
-
-            var myVoices = [];
-            for (var i=0; i<6; i++) {
-                var p = new Tone.Sampler('sounds/' + name + '.mp3').toMaster();
-                myVoices.push(p);
-            }
-
-            var polySampler = {
-                voices : myVoices,
-                currentVoice : 0,
-                nextVoice : function() {return this.voices[this.currentVoice++ % this.voices.length];},
-                stopAllVoices : function() {for (var i=0;i<this.voices.length;i++) {this.voices[i].triggerRelease()}},
-            };
-
-            samplers.push(polySampler);
-        }
-
-        return samplers;
-    }
-	
-    // should fire once all sounds are loaded - seems to not work
-    Tone.Buffer.onload = function() {
-        console.log('loaded audio samples');
-    };
-
-    // scales and keys data
-
-	var scales = {
-		'MAJOR' : [0,2,4,5,7,9,11],
-		'MINOR' : [0,2,3,5,7,8,10],
-		'PENTATONIC': [0, 2, 4, 7, 9],
-		'CHROMATIC' : [0,1,2,3,4,5,6,7,8,9,10,11],
-	};
-	
-	var currentScale = scales['MAJOR'];
-	var rootNote = 60;
-	
-
-    function scaleNoteToMidiNote(scaleNote, scale, root) {
-		var scaleIndex = (Math.round(scaleNote) - 1) % scale.length;
-		if (scaleIndex < 0) {
-			scaleIndex += scale.length;
-		}
-		var octave = Math.floor((scaleNote - 1) / scale.length);
-		var midiNote = root + (octave * 12) + scale[scaleIndex]; 
-		return midiNote;
-	} 
-	
-	function midiToFreq(midiNote) {
-		var freq = tone.intervalToFrequencyRatio(midiNote - 60) * 261.63; // 60 is C4
-		return freq;
-	}
-
-    function clamp(input, min, max) {
-        return Math.min(Math.max(input, min), max);
-    };
-
-    function playNoteForBeats(note, beats) {
-        var midiNote = scaleNoteToMidiNote(note, currentScale, rootNote);
-        var freq = midiToFreq(midiNote);
-        synth.triggerAttackRelease(freq, beats, quantizeUnit);        
-    }
-
-    */
-
-    // onmessage calls are converted into emitted events.
-    instance.vmWorker.onmessage = function (e) {
-        /*
-        switch (e.data.method) {
-            case 'playsound':
-                soundSamplers[e.data.soundnum].nextVoice().triggerAttack(0, quantizeUnit);
-                break;
-            case 'playsoundwithpitch':
-                soundSamplers[e.data.soundnum].nextVoice().triggerAttack(e.data.pitch, quantizeUnit);
-                break;
-            case 'playnoteforbeats':
-                playNoteForBeats(e.data.note, e.data.beats);
-                break;
-            case 'playnote':
-                playNoteForBeats(e.data.note, 0.25);
-                break;
-            case 'setkey':
-                rootNote = parseInt(e.data.root) + 60;
-                currentScale = scales[e.data.scale];
-                break;
-            case 'playdrumforbeats':
-            case 'playdrum':
-                var drumNum = e.data.drum - 1; // one-indexing
-                drumSamplers[drumNum].nextVoice().triggerAttack(0, quantizeUnit);
-                break;
-            case 'seteffect' :
-                switch (e.data.effect) {
-                    case 'ECHO':
-                        delay.wet.value = (e.data.value / 100) / 2; // max 50% wet (need dry signal too)
-                        break;
-                    case 'PAN':
-                        panner.pan.value = e.data.value / 100;
-                        break;
-                    case 'REVERB':
-                        reverb.wet.value = e.data.value / 100;
-                        break;
-                    case 'PITCH':
-                        pitchShift.pitch = e.data.value;
-                        break;
-                }
-                break;
-            case 'changeeffect' :
-                switch (e.data.effect) {
-                    case 'ECHO':
-                        delay.wet.value += (e.data.value / 100) / 2; // max 50% wet (need dry signal too)
-                        delay.wet.value = clamp(delay.wet.value, 0, 0.5);
-                        break;
-                    case 'PAN':
-                        panner.pan.value += e.data.value / 100;
-                        panner.pan.value = clamp(panner.pan.value, -1, 1);
-                        break;
-                    case 'REVERB':
-                        reverb.wet.value += e.data.value / 100;
-                        reverb.wet.value = clamp(reverb.wet.value, 0, 1);
-                        break;
-                    case 'PITCH':
-                        pitchShift.pitch += e.data.value;
-                        break;
-                }
-                break;
-            case 'cleareffects' :
-                delay.wet.value = 0;
-                panner.pan.value = 0;
-                reverb.wet.value = 0;
-                pitchShift.pitch = 0;
-                break;
-            case 'stopallsounds' :
-                // stop sounds from the play sound block
-                // to do: stop sounds from play note and play drum blocks
-                for (var i=0; i<soundSamplers.length; i++) {
-                    soundSamplers[i].stopAllVoices();
-                }
-                break;
-        }
-        */
-        instance.emit(e.data.method, e.data);
-    };
-
-    instance.blockListener = function (e) {
-        // Messages from Blockly are not serializable by default.
-        // Pull out the necessary, serializable components to pass across.
-        var serializableE = {
-            blockId: e.blockId,
-            element: e.element,
-            type: e.type,
-            name: e.name,
-            newValue: e.newValue,
-            oldParentId: e.oldParentId,
-            oldInputName: e.oldInputName,
-            newParentId: e.newParentId,
-            newInputName: e.newInputName,
-            newCoordinate: e.newCoordinate,
-            xml: {
-                outerHTML: (e.xml) ? e.xml.outerHTML : null
-            }
-        };
-        instance.vmWorker.postMessage({
-            method: 'blockListener',
-            args: serializableE
-        });
-    };
-}
-
-/**
- * Inherit from EventEmitter
- */
-util.inherits(VirtualMachine, EventEmitter);
-
-// For documentation, please see index.js.
-// These mirror the functionality provided there, with the worker wrapper.
-VirtualMachine.prototype.getPlaygroundData = function () {
-    this.vmWorker.postMessage({method: 'getPlaygroundData'});
-};
-
-VirtualMachine.prototype.postIOData = function (device, data) {
-    this.vmWorker.postMessage({
-        method: 'postIOData',
-        device: device,
-        data: data
-    });
-};
-
-VirtualMachine.prototype.start = function () {
-    this.vmWorker.postMessage({method: 'start'});
-};
-
-VirtualMachine.prototype.greenFlag = function () {
-    this.vmWorker.postMessage({method: 'greenFlag'});
-};
-
-VirtualMachine.prototype.stopAll = function () {
-    this.vmWorker.postMessage({method: 'stopAll'});
-};
-
-VirtualMachine.prototype.animationFrame = function () {
-    this.vmWorker.postMessage({method: 'animationFrame'});
-};
-
-VirtualMachine.prototype.loadProject = function (json) {
-    this.vmWorker.postMessage({method: 'loadProject', json: json});
-};
-
-VirtualMachine.prototype.setEditingTarget = function (targetId) {
-    this.vmWorker.postMessage({method: 'setEditingTarget', targetId: targetId});
-};
-
-/**
- * Export and bind to `window`
- */
-module.exports = VirtualMachine;
-if (typeof window !== 'undefined') window.VirtualMachine = module.exports;
diff --git a/test/unit/blocks.js b/test/unit/blocks.js
index 81fb0ad9..2c9f8f13 100644
--- a/test/unit/blocks.js
+++ b/test/unit/blocks.js
@@ -291,6 +291,67 @@ test('move', function (t) {
     t.end();
 });
 
+test('move into empty', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'bar',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.moveBlock({
+        id: 'bar',
+        newInput: 'fooInput',
+        newParent: 'foo'
+    });
+    t.equal(b._blocks['foo'].inputs['fooInput'].block, 'bar');
+    t.end();
+});
+
+test('move no obscure shadow', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {
+            'fooInput': {
+                name: 'fooInput',
+                block: 'x',
+                shadow: 'y'
+            }
+        },
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'bar',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.moveBlock({
+        id: 'bar',
+        newInput: 'fooInput',
+        newParent: 'foo'
+    });
+    t.equal(b._blocks['foo'].inputs['fooInput'].block, 'bar');
+    t.equal(b._blocks['foo'].inputs['fooInput'].shadow, 'y');
+    t.end();
+});
+
 test('change', function (t) {
     var b = new Blocks();
     b.createBlock({
diff --git a/vm.js b/vm.js
index 2c59a03d..83bd7673 100644
--- a/vm.js
+++ b/vm.js
@@ -47,14 +47,10 @@
 	var EventEmitter = __webpack_require__(1);
 	var util = __webpack_require__(2);
 
-	var Sprite = __webpack_require__(6);
-	var Runtime = __webpack_require__(61);
-
-	/**
-	 * Whether the environment is a WebWorker.
-	 * @const{boolean}
-	 */
-	var ENV_WORKER = typeof importScripts === 'function';
+	var Runtime = __webpack_require__(6);
+	var sb2import = __webpack_require__(33);
+	var Sprite = __webpack_require__(85);
+	var Blocks = __webpack_require__(34);
 
 	/**
 	 * Handles connections between blocks, stage, and extensions.
@@ -63,35 +59,25 @@
 	 */
 	function VirtualMachine () {
 	    var instance = this;
-
 	    // Bind event emitter and runtime to VM instance
-	    // @todo Post message (Web Worker) polyfill
 	    EventEmitter.call(instance);
-	    // @todo support multiple targets/sprites.
-	    // This is just a demo/example.
-	    var exampleSprite = new Sprite();
-	    exampleSprite.createClone();
-	    var exampleTargets = [exampleSprite.clones[0]];
-	    instance.exampleSprite = exampleSprite;
-	    instance.runtime = new Runtime(exampleTargets);
-
 	    /**
-	     * Event listeners for scratch-blocks.
+	     * VM runtime, to store blocks, I/O devices, sprites/targets, etc.
+	     * @type {!Runtime}
 	     */
-	    instance.blockListener = (
-	        exampleSprite.blocks.generateBlockListener(false, instance.runtime)
-	    );
-
-	    instance.flyoutBlockListener = (
-	        exampleSprite.blocks.generateBlockListener(true, instance.runtime)
-	    );
-
+	    instance.runtime = new Runtime();
+	    /**
+	     * The "currently editing"/selected target ID for the VM.
+	     * Block events from any Blockly workspace are routed to this target.
+	     * @type {!string}
+	     */
+	    instance.editingTarget = null;
 	    // Runtime emits are passed along as VM emits.
-	    instance.runtime.on(Runtime.STACK_GLOW_ON, function (id) {
-	        instance.emit(Runtime.STACK_GLOW_ON, {id: id});
+	    instance.runtime.on(Runtime.SCRIPT_GLOW_ON, function (id) {
+	        instance.emit(Runtime.SCRIPT_GLOW_ON, {id: id});
 	    });
-	    instance.runtime.on(Runtime.STACK_GLOW_OFF, function (id) {
-	        instance.emit(Runtime.STACK_GLOW_OFF, {id: id});
+	    instance.runtime.on(Runtime.SCRIPT_GLOW_OFF, function (id) {
+	        instance.emit(Runtime.SCRIPT_GLOW_OFF, {id: id});
 	    });
 	    instance.runtime.on(Runtime.BLOCK_GLOW_ON, function (id) {
 	        instance.emit(Runtime.BLOCK_GLOW_ON, {id: id});
@@ -102,6 +88,8 @@
 	    instance.runtime.on(Runtime.VISUAL_REPORT, function (id, value) {
 	        instance.emit(Runtime.VISUAL_REPORT, {id: id, value: value});
 	    });
+
+	    this.blockListener = this.blockListener.bind(this);
 	}
 
 	/**
@@ -135,7 +123,7 @@
 	 */
 	VirtualMachine.prototype.getPlaygroundData = function () {
 	    this.emit('playgroundData', {
-	        blocks: this.exampleSprite.blocks,
+	        blocks: this.editingTarget.blocks,
 	        threads: this.runtime.threads
 	    });
 	};
@@ -158,74 +146,130 @@
 	    }
 	};
 
-	/*
-	 * Worker handlers: for all public methods available above,
-	 * we must also provide a message handler in case the VM is run
-	 * from a worker environment.
+	/**
+	 * Load a project from a Scratch 2.0 JSON representation.
+	 * @param {?string} json JSON string representing the project.
 	 */
-	if (ENV_WORKER) {
-	    self.importScripts(
-	        './node_modules/scratch-render/render-worker.js'
-	    );
-	    self.renderer = new self.RenderWebGLWorker();
-	    self.vmInstance = new VirtualMachine();
-	    self.onmessage = function (e) {
-	        var messageData = e.data;
-	        switch (messageData.method) {
-	        case 'start':
-	            self.vmInstance.runtime.start();
-	            break;
-	        case 'greenFlag':
-	            self.vmInstance.runtime.greenFlag();
-	            break;
-	        case 'stopAll':
-	            self.vmInstance.runtime.stopAll();
-	            break;
-	        case 'blockListener':
-	            self.vmInstance.blockListener(messageData.args);
-	            break;
-	        case 'flyoutBlockListener':
-	            self.vmInstance.flyoutBlockListener(messageData.args);
-	            break;
-	        case 'getPlaygroundData':
-	            self.postMessage({
-	                method: 'playgroundData',
-	                blocks: self.vmInstance.exampleSprite.blocks,
-	                threads: self.vmInstance.runtime.threads
-	            });
-	            break;
-	        case 'animationFrame':
-	            self.vmInstance.animationFrame();
-	            break;
-	        case 'postIOData':
-	            self.vmInstance.postIOData(messageData.device, messageData.data);
-	            break;
-	        default:
-	            if (e.data.id == 'RendererConnected') {
-	                //initRenderWorker();
-	            }
-	            self.renderer.onmessage(e);
-	            break;
-	        }
-	    };
-	    // Bind runtime's emitted events to postmessages.
-	    self.vmInstance.runtime.on(Runtime.STACK_GLOW_ON, function (id) {
-	        self.postMessage({method: Runtime.STACK_GLOW_ON, id: id});
-	    });
-	    self.vmInstance.runtime.on(Runtime.STACK_GLOW_OFF, function (id) {
-	        self.postMessage({method: Runtime.STACK_GLOW_OFF, id: id});
-	    });
-	    self.vmInstance.runtime.on(Runtime.BLOCK_GLOW_ON, function (id) {
-	        self.postMessage({method: Runtime.BLOCK_GLOW_ON, id: id});
-	    });
-	    self.vmInstance.runtime.on(Runtime.BLOCK_GLOW_OFF, function (id) {
-	        self.postMessage({method: Runtime.BLOCK_GLOW_OFF, id: id});
-	    });
-	    self.vmInstance.runtime.on(Runtime.VISUAL_REPORT, function (id, value) {
-	        self.postMessage({method: Runtime.VISUAL_REPORT, id: id, value: value});
-	    });
-	}
+	VirtualMachine.prototype.loadProject = function (json) {
+	    // @todo: Handle other formats, e.g., Scratch 1.4, Scratch 3.0.
+	    sb2import(json, this.runtime);
+	    // Select the first target for editing, e.g., the stage.
+	    this.editingTarget = this.runtime.targets[0];
+	    // Update the VM user's knowledge of targets and blocks on the workspace.
+	    this.emitTargetsUpdate();
+	    this.emitWorkspaceUpdate();
+	    this.runtime.setEditingTarget(this.editingTarget);
+	};
 
+	/**
+	 * Temporary way to make an empty project, in case the desired project
+	 * cannot be loaded from the online server.
+	 */
+	VirtualMachine.prototype.createEmptyProject = function () {
+	    // Stage.
+	    var blocks2 = new Blocks();
+	    var stage = new Sprite(blocks2);
+	    stage.name = 'Stage';
+	    stage.costumes.push({
+	        skin: '/assets/stage.png',
+	        name: 'backdrop1',
+	        bitmapResolution: 1,
+	        rotationCenterX: 240,
+	        rotationCenterY: 180
+	    });
+	    var target2 = stage.createClone();
+	    this.runtime.targets.push(target2);
+	    target2.x = 0;
+	    target2.y = 0;
+	    target2.direction = 90;
+	    target2.size = 200;
+	    target2.visible = true;
+	    target2.isStage = true;
+	    // Sprite1 (cat).
+	    var blocks1 = new Blocks();
+	    var sprite = new Sprite(blocks1);
+	    sprite.name = 'Sprite1';
+	    sprite.costumes.push({
+	        skin: '/assets/scratch_cat.svg',
+	        name: 'costume1',
+	        bitmapResolution: 1,
+	        rotationCenterX: 47,
+	        rotationCenterY: 55
+	    });
+	    var target1 = sprite.createClone();
+	    this.runtime.targets.push(target1);
+	    target1.x = 0;
+	    target1.y = 0;
+	    target1.direction = 90;
+	    target1.size = 100;
+	    target1.visible = true;
+	    this.editingTarget = this.runtime.targets[0];
+	    this.emitTargetsUpdate();
+	    this.emitWorkspaceUpdate();
+	};
+
+	/**
+	 * Handle a Blockly event for the current editing target.
+	 * @param {!Blockly.Event} e Any Blockly event.
+	 */
+	VirtualMachine.prototype.blockListener = function (e) {
+	    if (this.editingTarget) {
+	        this.editingTarget.blocks.blocklyListen(
+	            e,
+	            false,
+	            this.runtime
+	        );
+	    }
+	};
+
+	/**
+	 * Set an editing target. An editor UI can use this function to switch
+	 * between editing different targets, sprites, etc.
+	 * After switching the editing target, the VM may emit updates
+	 * to the list of targets and any attached workspace blocks
+	 * (see `emitTargetsUpdate` and `emitWorkspaceUpdate`).
+	 * @param {string} targetId Id of target to set as editing.
+	 */
+	VirtualMachine.prototype.setEditingTarget = function (targetId) {
+	    // Has the target id changed? If not, exit.
+	    if (targetId == this.editingTarget.id) {
+	        return;
+	    }
+	    var target = this.runtime.getTargetById(targetId);
+	    if (target) {
+	        this.editingTarget = target;
+	        // Emit appropriate UI updates.
+	        this.emitTargetsUpdate();
+	        this.emitWorkspaceUpdate();
+	        this.runtime.setEditingTarget(target);
+	    }
+	};
+
+	/**
+	 * Emit metadata about available targets.
+	 * An editor UI could use this to display a list of targets and show
+	 * the currently editing one.
+	 */
+	VirtualMachine.prototype.emitTargetsUpdate = function () {
+	    this.emit('targetsUpdate', {
+	        // [[target id, human readable target name], ...].
+	        targetList: this.runtime.targets.map(function(target) {
+	            return [target.id, target.getName()];
+	        }),
+	        // Currently editing target id.
+	        editingTarget: this.editingTarget.id
+	    });
+	};
+
+	/**
+	 * Emit an Blockly/scratch-blocks compatible XML representation
+	 * of the current editing target's blocks.
+	 */
+	VirtualMachine.prototype.emitWorkspaceUpdate = function () {
+	    this.emit('workspaceUpdate', {
+	        'xml': this.editingTarget.blocks.toXML()
+	    });
+	};
 	/**
 	 * Export and bind to `window`
 	 */
@@ -296,8 +340,12 @@
 	      er = arguments[1];
 	      if (er instanceof Error) {
 	        throw er; // Unhandled 'error' event
+	      } else {
+	        // At least give some kind of context to the user
+	        var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
+	        err.context = er;
+	        throw err;
 	      }
-	      throw TypeError('Uncaught, unspecified "error" event.');
 	    }
 	  }
 
@@ -1135,8 +1183,74 @@
 /***/ function(module, exports) {
 
 	// shim for using process in browser
-
 	var process = module.exports = {};
+
+	// cached from whatever global is present so that test runners that stub it
+	// don't break things.  But we need to wrap it in a try catch in case it is
+	// wrapped in strict mode code which doesn't define any globals.  It's inside a
+	// function because try/catches deoptimize in certain engines.
+
+	var cachedSetTimeout;
+	var cachedClearTimeout;
+
+	(function () {
+	    try {
+	        cachedSetTimeout = setTimeout;
+	    } catch (e) {
+	        cachedSetTimeout = function () {
+	            throw new Error('setTimeout is not defined');
+	        }
+	    }
+	    try {
+	        cachedClearTimeout = clearTimeout;
+	    } catch (e) {
+	        cachedClearTimeout = function () {
+	            throw new Error('clearTimeout is not defined');
+	        }
+	    }
+	} ())
+	function runTimeout(fun) {
+	    if (cachedSetTimeout === setTimeout) {
+	        //normal enviroments in sane situations
+	        return setTimeout(fun, 0);
+	    }
+	    try {
+	        // when when somebody has screwed with setTimeout but no I.E. maddness
+	        return cachedSetTimeout(fun, 0);
+	    } catch(e){
+	        try {
+	            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
+	            return cachedSetTimeout.call(null, fun, 0);
+	        } catch(e){
+	            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
+	            return cachedSetTimeout.call(this, fun, 0);
+	        }
+	    }
+
+
+	}
+	function runClearTimeout(marker) {
+	    if (cachedClearTimeout === clearTimeout) {
+	        //normal enviroments in sane situations
+	        return clearTimeout(marker);
+	    }
+	    try {
+	        // when when somebody has screwed with setTimeout but no I.E. maddness
+	        return cachedClearTimeout(marker);
+	    } catch (e){
+	        try {
+	            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
+	            return cachedClearTimeout.call(null, marker);
+	        } catch (e){
+	            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
+	            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
+	            return cachedClearTimeout.call(this, marker);
+	        }
+	    }
+
+
+
+	}
 	var queue = [];
 	var draining = false;
 	var currentQueue;
@@ -1161,7 +1275,7 @@
 	    if (draining) {
 	        return;
 	    }
-	    var timeout = setTimeout(cleanUpNextTick);
+	    var timeout = runTimeout(cleanUpNextTick);
 	    draining = true;
 
 	    var len = queue.length;
@@ -1178,7 +1292,7 @@
 	    }
 	    currentQueue = null;
 	    draining = false;
-	    clearTimeout(timeout);
+	    runClearTimeout(timeout);
 	}
 
 	process.nextTick = function (fun) {
@@ -1190,7 +1304,7 @@
 	    }
 	    queue.push(new Item(fun, args));
 	    if (queue.length === 1 && !draining) {
-	        setTimeout(drainQueue, 0);
+	        runTimeout(drainQueue);
 	    }
 	};
 
@@ -1274,232 +1388,1504 @@
 /* 6 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var Clone = __webpack_require__(7);
-	var Blocks = __webpack_require__(10);
+	var EventEmitter = __webpack_require__(1);
+	var Sequencer = __webpack_require__(7);
+	var Thread = __webpack_require__(9);
+	var util = __webpack_require__(2);
+
+	// Virtual I/O devices.
+	var Clock = __webpack_require__(11);
+	var Keyboard = __webpack_require__(12);
+	var Mouse = __webpack_require__(15);
+
+	var defaultBlockPackages = {
+	    'scratch3_control': __webpack_require__(17),
+	    'scratch3_event': __webpack_require__(28),
+	    'scratch3_looks': __webpack_require__(29),
+	    'scratch3_motion': __webpack_require__(30),
+	    'scratch3_operators': __webpack_require__(31),
+	    'scratch3_sensing': __webpack_require__(32)
+	};
 
 	/**
-	 * Sprite to be used on the Scratch stage.
-	 * All clones of a sprite have shared blocks, shared costumes, shared variables.
-	 * @param {?Blocks} blocks Shared blocks object for all clones of sprite.
-	 * @constructor
+	 * Manages targets, scripts, and the sequencer.
 	 */
-	function Sprite (blocks) {
-	    if (!blocks) {
-	        // Shared set of blocks for all clones.
-	        blocks = new Blocks();
-	    }
-	    this.blocks = blocks;
-	    this.clones = [];
+	function Runtime () {
+	    // Bind event emitter
+	    EventEmitter.call(this);
+
+	    // State for the runtime
+
+	    /**
+	     * Target management and storage.
+	     * @type {Array.<!Target>}
+	     */
+	    this.targets = [];
+
+	    /**
+	     * A list of threads that are currently running in the VM.
+	     * Threads are added when execution starts and pruned when execution ends.
+	     * @type {Array.<Thread>}
+	     */
+	    this.threads = [];
+
+	    /** @type {!Sequencer} */
+	    this.sequencer = new Sequencer(this);
+
+	    /**
+	     * Map to look up a block primitive's implementation function by its opcode.
+	     * This is a two-step lookup: package name first, then primitive name.
+	     * @type {Object.<string, Function>}
+	     */
+	    this._primitives = {};
+	    this._hats = {};
+	    this._edgeActivatedHatValues = {};
+	    this._registerBlockPackages();
+
+	    this.ioDevices = {
+	        'clock': new Clock(),
+	        'keyboard': new Keyboard(this),
+	        'mouse': new Mouse(this)
+	    };
+
+	    this._scriptGlowsPreviousFrame = [];
+	    this._editingTarget = null;
 	}
 
 	/**
-	 * Create a clone of this sprite.
-	 * @returns {!Clone} Newly created clone.
+	 * Event name for glowing a script.
+	 * @const {string}
 	 */
-	Sprite.prototype.createClone = function () {
-	    var newClone = new Clone(this.blocks);
-	    this.clones.push(newClone);
-	    return newClone;
+	Runtime.SCRIPT_GLOW_ON = 'STACK_GLOW_ON';
+
+	/**
+	 * Event name for unglowing a script.
+	 * @const {string}
+	 */
+	Runtime.SCRIPT_GLOW_OFF = 'STACK_GLOW_OFF';
+
+	/**
+	 * Event name for glowing a block.
+	 * @const {string}
+	 */
+	Runtime.BLOCK_GLOW_ON = 'BLOCK_GLOW_ON';
+
+	/**
+	 * Event name for unglowing a block.
+	 * @const {string}
+	 */
+	Runtime.BLOCK_GLOW_OFF = 'BLOCK_GLOW_OFF';
+
+	/**
+	 * Event name for visual value report.
+	 * @const {string}
+	 */
+	Runtime.VISUAL_REPORT = 'VISUAL_REPORT';
+
+	/**
+	 * Inherit from EventEmitter
+	 */
+	util.inherits(Runtime, EventEmitter);
+
+	/**
+	 * How rapidly we try to step threads, in ms.
+	 */
+	Runtime.THREAD_STEP_INTERVAL = 1000 / 60;
+
+
+	// -----------------------------------------------------------------------------
+	// -----------------------------------------------------------------------------
+
+	/**
+	 * Register default block packages with this runtime.
+	 * @todo Prefix opcodes with package name.
+	 * @private
+	 */
+	Runtime.prototype._registerBlockPackages = function () {
+	    for (var packageName in defaultBlockPackages) {
+	        if (defaultBlockPackages.hasOwnProperty(packageName)) {
+	            // @todo pass a different runtime depending on package privilege?
+	            var packageObject = new (defaultBlockPackages[packageName])(this);
+	            // Collect primitives from package.
+	            if (packageObject.getPrimitives) {
+	                var packagePrimitives = packageObject.getPrimitives();
+	                for (var op in packagePrimitives) {
+	                    if (packagePrimitives.hasOwnProperty(op)) {
+	                        this._primitives[op] =
+	                            packagePrimitives[op].bind(packageObject);
+	                    }
+	                }
+	            }
+	            // Collect hat metadata from package.
+	            if (packageObject.getHats) {
+	                var packageHats = packageObject.getHats();
+	                for (var hatName in packageHats) {
+	                    if (packageHats.hasOwnProperty(hatName)) {
+	                        this._hats[hatName] = packageHats[hatName];
+	                    }
+	                }
+	            }
+	        }
+	    }
 	};
 
-	module.exports = Sprite;
+	/**
+	 * Retrieve the function associated with the given opcode.
+	 * @param {!string} opcode The opcode to look up.
+	 * @return {Function} The function which implements the opcode.
+	 */
+	Runtime.prototype.getOpcodeFunction = function (opcode) {
+	    return this._primitives[opcode];
+	};
+
+	// -----------------------------------------------------------------------------
+	// -----------------------------------------------------------------------------
+
+	/**
+	 * Return whether an opcode represents a hat block.
+	 * @param {!string} opcode The opcode to look up.
+	 * @return {Boolean} True if the op is known to be a hat.
+	 */
+	Runtime.prototype.getIsHat = function (opcode) {
+	    return this._hats.hasOwnProperty(opcode);
+	};
+
+	/**
+	 * Return whether an opcode represents an edge-activated hat block.
+	 * @param {!string} opcode The opcode to look up.
+	 * @return {Boolean} True if the op is known to be a edge-activated hat.
+	 */
+	Runtime.prototype.getIsEdgeActivatedHat = function (opcode) {
+	    return this._hats.hasOwnProperty(opcode) &&
+	        this._hats[opcode].edgeActivated;
+	};
+
+	/**
+	 * Update an edge-activated hat block value.
+	 * @param {!string} blockId ID of hat to store value for.
+	 * @param {*} newValue Value to store for edge-activated hat.
+	 * @return {*} The old value for the edge-activated hat.
+	 */
+	Runtime.prototype.updateEdgeActivatedValue = function (blockId, newValue) {
+	    var oldValue = this._edgeActivatedHatValues[blockId];
+	    this._edgeActivatedHatValues[blockId] = newValue;
+	    return oldValue;
+	};
+
+	/**
+	 * Clear all edge-activaed hat values.
+	 */
+	Runtime.prototype.clearEdgeActivatedValues = function () {
+	    this._edgeActivatedHatValues = {};
+	};
+
+	// -----------------------------------------------------------------------------
+	// -----------------------------------------------------------------------------
+
+	/**
+	 * Create a thread and push it to the list of threads.
+	 * @param {!string} id ID of block that starts the stack
+	 * @return {!Thread} The newly created thread.
+	 */
+	Runtime.prototype._pushThread = function (id) {
+	    var thread = new Thread(id);
+	    thread.pushStack(id);
+	    this.threads.push(thread);
+	    return thread;
+	};
+
+	/**
+	 * Remove a thread from the list of threads.
+	 * @param {?Thread} thread Thread object to remove from actives
+	 */
+	Runtime.prototype._removeThread = function (thread) {
+	    var i = this.threads.indexOf(thread);
+	    if (i > -1) {
+	        this.threads.splice(i, 1);
+	    }
+	};
+
+	/**
+	 * Return whether a thread is currently active/running.
+	 * @param {?Thread} thread Thread object to check.
+	 * @return {Boolean} True if the thread is active/running.
+	 */
+	Runtime.prototype.isActiveThread = function (thread) {
+	    return this.threads.indexOf(thread) > -1;
+	};
+
+	/**
+	 * Toggle a script.
+	 * @param {!string} topBlockId ID of block that starts the script.
+	 */
+	Runtime.prototype.toggleScript = function (topBlockId) {
+	    // Remove any existing thread.
+	    for (var i = 0; i < this.threads.length; i++) {
+	        if (this.threads[i].topBlock == topBlockId) {
+	            this._removeThread(this.threads[i]);
+	            return;
+	        }
+	    }
+	    // Otherwise add it.
+	    this._pushThread(topBlockId);
+	};
+
+	/**
+	 * Run a function `f` for all scripts in a workspace.
+	 * `f` will be called with two parameters:
+	 *  - the top block ID of the script.
+	 *  - the target that owns the script.
+	 * @param {!Function} f Function to call for each script.
+	 * @param {Target=} opt_target Optionally, a target to restrict to.
+	 */
+	Runtime.prototype.allScriptsDo = function (f, opt_target) {
+	    var targets = this.targets;
+	    if (opt_target) {
+	        targets = [opt_target];
+	    }
+	    for (var t = 0; t < targets.length; t++) {
+	        var target = targets[t];
+	        var scripts = target.blocks.getScripts();
+	        for (var j = 0; j < scripts.length; j++) {
+	            var topBlockId = scripts[j];
+	            f(topBlockId, target);
+	        }
+	    }
+	};
+
+	/**
+	 * Start all relevant hats.
+	 * @param {!string} requestedHatOpcode Opcode of hats to start.
+	 * @param {Object=} opt_matchFields Optionally, fields to match on the hat.
+	 * @param {Target=} opt_target Optionally, a target to restrict to.
+	 * @return {Array.<Thread>} List of threads started by this function.
+	 */
+	Runtime.prototype.startHats = function (requestedHatOpcode,
+	    opt_matchFields, opt_target) {
+	    if (!this._hats.hasOwnProperty(requestedHatOpcode)) {
+	        // No known hat with this opcode.
+	        return;
+	    }
+	    var instance = this;
+	    var newThreads = [];
+	    // Consider all scripts, looking for hats with opcode `requestedHatOpcode`.
+	    this.allScriptsDo(function(topBlockId, target) {
+	        var potentialHatOpcode = target.blocks.getBlock(topBlockId).opcode;
+	        if (potentialHatOpcode !== requestedHatOpcode) {
+	            // Not the right hat.
+	            return;
+	        }
+	        // Match any requested fields.
+	        // For example: ensures that broadcasts match.
+	        // This needs to happen before the block is evaluated
+	        // (i.e., before the predicate can be run) because "broadcast and wait"
+	        // needs to have a precise collection of started threads.
+	        var hatFields = target.blocks.getFields(topBlockId);
+	        if (opt_matchFields) {
+	            for (var matchField in opt_matchFields) {
+	                if (hatFields[matchField].value !==
+	                    opt_matchFields[matchField]) {
+	                    // Field mismatch.
+	                    return;
+	                }
+	            }
+	        }
+	        // Look up metadata for the relevant hat.
+	        var hatMeta = instance._hats[requestedHatOpcode];
+	        if (hatMeta.restartExistingThreads) {
+	            // If `restartExistingThreads` is true, we should stop
+	            // any existing threads starting with the top block.
+	            for (var i = 0; i < instance.threads.length; i++) {
+	                if (instance.threads[i].topBlock === topBlockId) {
+	                    instance._removeThread(instance.threads[i]);
+	                }
+	            }
+	        } else {
+	            // If `restartExistingThreads` is false, we should
+	            // give up if any threads with the top block are running.
+	            for (var j = 0; j < instance.threads.length; j++) {
+	                if (instance.threads[j].topBlock === topBlockId) {
+	                    // Some thread is already running.
+	                    return;
+	                }
+	            }
+	        }
+	        // Start the thread with this top block.
+	        newThreads.push(instance._pushThread(topBlockId));
+	    }, opt_target);
+	    return newThreads;
+	};
+
+	/**
+	 * Start all threads that start with the green flag.
+	 */
+	Runtime.prototype.greenFlag = function () {
+	    this.ioDevices.clock.resetProjectTimer();
+	    this.clearEdgeActivatedValues();
+	    this.startHats('event_whenflagclicked');
+	};
+
+	/**
+	 * Stop "everything"
+	 */
+	Runtime.prototype.stopAll = function () {
+	    var threadsCopy = this.threads.slice();
+	    while (threadsCopy.length > 0) {
+	        var poppedThread = threadsCopy.pop();
+	        this._removeThread(poppedThread);
+	    }
+	};
+
+	/**
+	 * Repeatedly run `sequencer.stepThreads` and filter out
+	 * inactive threads after each iteration.
+	 */
+	Runtime.prototype._step = function () {
+	    // Find all edge-activated hats, and add them to threads to be evaluated.
+	    for (var hatType in this._hats) {
+	        var hat = this._hats[hatType];
+	        if (hat.edgeActivated) {
+	            this.startHats(hatType);
+	        }
+	    }
+	    var inactiveThreads = this.sequencer.stepThreads(this.threads);
+	    this._updateScriptGlows();
+	    for (var i = 0; i < inactiveThreads.length; i++) {
+	        this._removeThread(inactiveThreads[i]);
+	    }
+	};
+
+	Runtime.prototype.setEditingTarget = function (editingTarget) {
+	    this._scriptGlowsPreviousFrame = [];
+	    this._editingTarget = editingTarget;
+	    this._updateScriptGlows();
+	};
+
+	Runtime.prototype._updateScriptGlows = function () {
+	    // Set of scripts that request a glow this frame.
+	    var requestedGlowsThisFrame = [];
+	    // Final set of scripts glowing during this frame.
+	    var finalScriptGlows = [];
+	    // Find all scripts that should be glowing.
+	    for (var i = 0; i < this.threads.length; i++) {
+	        var thread = this.threads[i];
+	        var target = this.targetForThread(thread);
+	        if (thread.requestScriptGlowInFrame && target == this._editingTarget) {
+	            var blockForThread = thread.peekStack() || thread.topBlock;
+	            var script = target.blocks.getTopLevelScript(blockForThread);
+	            requestedGlowsThisFrame.push(script);
+	        }
+	    }
+	    // Compare to previous frame.
+	    for (var j = 0; j < this._scriptGlowsPreviousFrame.length; j++) {
+	        var previousFrameGlow = this._scriptGlowsPreviousFrame[j];
+	        if (requestedGlowsThisFrame.indexOf(previousFrameGlow) < 0) {
+	            // Glow turned off.
+	            this.glowScript(previousFrameGlow, false);
+	        } else {
+	            // Still glowing.
+	            finalScriptGlows.push(previousFrameGlow);
+	        }
+	    }
+	    for (var k = 0; k < requestedGlowsThisFrame.length; k++) {
+	        var currentFrameGlow = requestedGlowsThisFrame[k];
+	        if (this._scriptGlowsPreviousFrame.indexOf(currentFrameGlow) < 0) {
+	            // Glow turned on.
+	            this.glowScript(currentFrameGlow, true);
+	            finalScriptGlows.push(currentFrameGlow);
+	        }
+	    }
+	    this._scriptGlowsPreviousFrame = finalScriptGlows;
+	};
+
+	/**
+	 * Emit feedback for block glowing (used in the sequencer).
+	 * @param {?string} blockId ID for the block to update glow
+	 * @param {boolean} isGlowing True to turn on glow; false to turn off.
+	 */
+	Runtime.prototype.glowBlock = function (blockId, isGlowing) {
+	    if (isGlowing) {
+	        this.emit(Runtime.BLOCK_GLOW_ON, blockId);
+	    } else {
+	        this.emit(Runtime.BLOCK_GLOW_OFF, blockId);
+	    }
+	};
+
+	/**
+	 * Emit feedback for script glowing.
+	 * @param {?string} topBlockId ID for the top block to update glow
+	 * @param {boolean} isGlowing True to turn on glow; false to turn off.
+	 */
+	Runtime.prototype.glowScript = function (topBlockId, isGlowing) {
+	    if (isGlowing) {
+	        this.emit(Runtime.SCRIPT_GLOW_ON, topBlockId);
+	    } else {
+	        this.emit(Runtime.SCRIPT_GLOW_OFF, topBlockId);
+	    }
+	};
+
+	/**
+	 * Emit value for reporter to show in the blocks.
+	 * @param {string} blockId ID for the block.
+	 * @param {string} value Value to show associated with the block.
+	 */
+	Runtime.prototype.visualReport = function (blockId, value) {
+	    this.emit(Runtime.VISUAL_REPORT, blockId, String(value));
+	};
+
+	/**
+	 * Return the Target for a particular thread.
+	 * @param {!Thread} thread Thread to determine target for.
+	 * @return {?Target} Target object, if one exists.
+	 */
+	Runtime.prototype.targetForThread = function (thread) {
+	    // @todo This is a messy solution,
+	    // but prevents having circular data references.
+	    // Have a map or some other way to associate target with threads.
+	    for (var t = 0; t < this.targets.length; t++) {
+	        var target = this.targets[t];
+	        if (target.blocks.getBlock(thread.topBlock)) {
+	            return target;
+	        }
+	    }
+	};
+
+	/**
+	 * Get a target by its id.
+	 * @param {string} targetId Id of target to find.
+	 * @return {?Target} The target, if found.
+	 */
+	Runtime.prototype.getTargetById = function (targetId) {
+	    for (var i = 0; i < this.targets.length; i++) {
+	        var target = this.targets[i];
+	        if (target.id == targetId) {
+	            return target;
+	        }
+	    }
+	};
+
+	/**
+	 * Get a target representing the Scratch stage, if one exists.
+	 * @return {?Target} The target, if found.
+	 */
+	Runtime.prototype.getTargetForStage = function () {
+	    for (var i = 0; i < this.targets.length; i++) {
+	        var target = this.targets[i];
+	        if (target.isStage) {
+	            return target;
+	        }
+	    }
+	};
+
+	/**
+	 * Handle an animation frame from the main thread.
+	 */
+	Runtime.prototype.animationFrame = function () {
+	    if (self.renderer) {
+	        self.renderer.draw();
+	    }
+	};
+
+	/**
+	 * Set up timers to repeatedly step in a browser
+	 */
+	Runtime.prototype.start = function () {
+	    self.setInterval(function() {
+	        this._step();
+	    }.bind(this), Runtime.THREAD_STEP_INTERVAL);
+	};
+
+	module.exports = Runtime;
 
 
 /***/ },
 /* 7 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var util = __webpack_require__(2);
-	var MathUtil = __webpack_require__(8);
-	var Target = __webpack_require__(9);
+	var Timer = __webpack_require__(8);
+	var Thread = __webpack_require__(9);
+	var execute = __webpack_require__(10);
 
-	/**
-	 * Clone (instance) of a sprite.
-	 * @param {!Blocks} spriteBlocks Reference to the sprite's blocks.
-	 * @constructor
-	 */
-	function Clone(spriteBlocks) {
-	    Target.call(this, spriteBlocks);
+	function Sequencer (runtime) {
 	    /**
-	     * Reference to the global renderer for this VM, if one exists.
-	     * @type {?RenderWebGLWorker}
+	     * A utility timer for timing thread sequencing.
+	     * @type {!Timer}
 	     */
-	    this.renderer = null;
-	    // If this is not true, there is no renderer (e.g., running in a test env).
-	    if (typeof self !== 'undefined' && self.renderer) {
-	        // Pull from `self.renderer`.
-	        this.renderer = self.renderer;
-	    }
-	    /**
-	     * ID of the drawable for this clone returned by the renderer, if rendered.
-	     * @type {?Number}
-	     */
-	    this.drawableID = null;
+	    this.timer = new Timer();
 
-	    this.initDrawable();
+	    /**
+	     * Reference to the runtime owning this sequencer.
+	     * @type {!Runtime}
+	     */
+	    this.runtime = runtime;
 	}
-	util.inherits(Clone, Target);
 
 	/**
-	 * Create a clone's drawable with the this.renderer.
+	 * The sequencer does as much work as it can within WORK_TIME milliseconds,
+	 * then yields. This is essentially a rate-limiter for blocks.
+	 * In Scratch 2.0, this is set to 75% of the target stage frame-rate (30fps).
+	 * @const {!number}
 	 */
-	Clone.prototype.initDrawable = function () {
-	    if (this.renderer) {
-	        var createPromise = this.renderer.createDrawable();
-	        var instance = this;
-	        createPromise.then(function (id) {
-	            instance.drawableID = id;
-	        });
+	Sequencer.WORK_TIME = 10;
+
+	/**
+	 * Step through all threads in `this.threads`, running them in order.
+	 * @param {Array.<Thread>} threads List of which threads to step.
+	 * @return {Array.<Thread>} All threads which have finished in this iteration.
+	 */
+	Sequencer.prototype.stepThreads = function (threads) {
+	    // Start counting toward WORK_TIME
+	    this.timer.start();
+	    // List of threads which have been killed by this step.
+	    var inactiveThreads = [];
+	    // If all of the threads are yielding, we should yield.
+	    var numYieldingThreads = 0;
+	    // Clear all yield statuses that were for the previous frame.
+	    for (var t = 0; t < threads.length; t++) {
+	        if (threads[t].status === Thread.STATUS_YIELD_FRAME) {
+	            threads[t].setStatus(Thread.STATUS_RUNNING);
+	        }
 	    }
-	};
 
-	// Clone-level properties.
-	/**
-	 * Scratch X coordinate. Currently should range from -240 to 240.
-	 * @type {!number}
-	 */
-	Clone.prototype.x = 0;
-
-	/**
-	 * Scratch Y coordinate. Currently should range from -180 to 180.
-	 * @type {!number}
-	 */
-	Clone.prototype.y = 0;
-
-	/**
-	 * Scratch direction. Currently should range from -179 to 180.
-	 * @type {!number}
-	 */
-	Clone.prototype.direction = 90;
-
-	/**
-	 * Whether the clone is currently visible.
-	 * @type {!boolean}
-	 */
-	Clone.prototype.visible = true;
-
-	/**
-	 * Size of clone as a percent of costume size. Ranges from 5% to 535%.
-	 * @type {!number}
-	 */
-	Clone.prototype.size = 100;
-
-	/**
-	 * Map of current graphic effect values.
-	 * @type {!Object.<string, number>}
-	 */
-	Clone.prototype.effects = {
-	    'color': 0,
-	    'fisheye': 0,
-	    'whirl': 0,
-	    'pixelate': 0,
-	    'mosaic': 0,
-	    'brightness': 0,
-	    'ghost': 0
-	};
-	// End clone-level properties.
-
-	/**
-	 * Set the X and Y coordinates of a clone.
-	 * @param {!number} x New X coordinate of clone, in Scratch coordinates.
-	 * @param {!number} y New Y coordinate of clone, in Scratch coordinates.
-	 */
-	Clone.prototype.setXY = function (x, y) {
-	    this.x = x;
-	    this.y = y;
-	    if (this.renderer) {
-	        this.renderer.updateDrawableProperties(this.drawableID, {
-	            position: [this.x, this.y]
-	        });
+	    // While there are still threads to run and we are within WORK_TIME,
+	    // continue executing threads.
+	    while (threads.length > 0 &&
+	           threads.length > numYieldingThreads &&
+	           this.timer.timeElapsed() < Sequencer.WORK_TIME) {
+	        // New threads at the end of the iteration.
+	        var newThreads = [];
+	        // Reset yielding thread count.
+	        numYieldingThreads = 0;
+	        // Attempt to run each thread one time
+	        for (var i = 0; i < threads.length; i++) {
+	            var activeThread = threads[i];
+	            if (activeThread.status === Thread.STATUS_RUNNING) {
+	                // Normal-mode thread: step.
+	                this.startThread(activeThread);
+	            } else if (activeThread.status === Thread.STATUS_YIELD ||
+	                       activeThread.status === Thread.STATUS_YIELD_FRAME) {
+	                // Yielding thread: do nothing for this step.
+	                numYieldingThreads++;
+	            }
+	            if (activeThread.stack.length === 0 &&
+	                activeThread.status === Thread.STATUS_DONE) {
+	                // Finished with this thread - tell runtime to clean it up.
+	                inactiveThreads.push(activeThread);
+	            } else {
+	                // Keep this thead in the loop.
+	                newThreads.push(activeThread);
+	            }
+	        }
+	        // Effectively filters out threads that have stopped.
+	        threads = newThreads;
 	    }
+	    return inactiveThreads;
 	};
 
 	/**
-	 * Set the direction of a clone.
-	 * @param {!number} direction New direction of clone.
+	 * Step the requested thread
+	 * @param {!Thread} thread Thread object to step
 	 */
-	Clone.prototype.setDirection = function (direction) {
-	    // Keep direction between -179 and +180.
-	    this.direction = MathUtil.wrapClamp(direction, -179, 180);
-	    if (this.renderer) {
-	        this.renderer.updateDrawableProperties(this.drawableID, {
-	            direction: this.direction
-	        });
-	    }
-	};
-
-	/**
-	 * Set a say bubble on this clone.
-	 * @param {?string} type Type of say bubble: "say", "think", or null.
-	 * @param {?string} message Message to put in say bubble.
-	 */
-	Clone.prototype.setSay = function (type, message) {
-	    // @todo: Render to stage.
-	    if (!type || !message) {
-	        console.log('Clearing say bubble');
+	Sequencer.prototype.startThread = function (thread) {
+	    var currentBlockId = thread.peekStack();
+	    if (!currentBlockId) {
+	        // A "null block" - empty branch.
+	        // Yield for the frame.
+	        thread.popStack();
+	        thread.setStatus(Thread.STATUS_YIELD_FRAME);
 	        return;
 	    }
-	    console.log('Setting say bubble:', type, message);
-	};
-
-	/**
-	 * Set visibility of the clone; i.e., whether it's shown or hidden.
-	 * @param {!boolean} visible True if the sprite should be shown.
-	 */
-	Clone.prototype.setVisible = function (visible) {
-	    this.visible = visible;
-	    if (this.renderer) {
-	        this.renderer.updateDrawableProperties(this.drawableID, {
-	            visible: this.visible
-	        });
+	    // Execute the current block
+	    execute(this, thread);
+	    // If the block executed without yielding and without doing control flow,
+	    // move to done.
+	    if (thread.status === Thread.STATUS_RUNNING &&
+	        thread.peekStack() === currentBlockId) {
+	        this.proceedThread(thread);
 	    }
 	};
 
 	/**
-	 * Set size of the clone, as a percentage of the costume size.
-	 * @param {!number} size Size of clone, from 5 to 535.
+	 * Step a thread into a block's branch.
+	 * @param {!Thread} thread Thread object to step to branch.
+	 * @param {Number} branchNum Which branch to step to (i.e., 1, 2).
 	 */
-	Clone.prototype.setSize = function (size) {
-	    // Keep size between 5% and 535%.
-	    this.size = MathUtil.clamp(size, 5, 535);
-	    if (this.renderer) {
-	        this.renderer.updateDrawableProperties(this.drawableID, {
-	            scale: [this.size, this.size]
-	        });
+	Sequencer.prototype.stepToBranch = function (thread, branchNum) {
+	    if (!branchNum) {
+	        branchNum = 1;
+	    }
+	    var currentBlockId = thread.peekStack();
+	    var branchId = this.runtime.targetForThread(thread).blocks.getBranch(
+	        currentBlockId,
+	        branchNum
+	    );
+	    if (branchId) {
+	        // Push branch ID to the thread's stack.
+	        thread.pushStack(branchId);
+	    } else {
+	        // Push null, so we come back to the current block.
+	        thread.pushStack(null);
 	    }
 	};
 
 	/**
-	 * Set a particular graphic effect on this clone.
-	 * @param {!string} effectName Name of effect (see `Clone.prototype.effects`).
-	 * @param {!number} value Numerical magnitude of effect.
+	 * Step a thread into an input reporter, and manage its status appropriately.
+	 * @param {!Thread} thread Thread object to step to reporter.
+	 * @param {!string} blockId ID of reporter block.
+	 * @param {!string} inputName Name of input on parent block.
+	 * @return {boolean} True if yielded, false if it finished immediately.
 	 */
-	Clone.prototype.setEffect = function (effectName, value) {
-	    this.effects[effectName] = value;
-	    if (this.renderer) {
-	        var props = {};
-	        props[effectName] = this.effects[effectName];
-	        this.renderer.updateDrawableProperties(this.drawableID, props);
+	Sequencer.prototype.stepToReporter = function (thread, blockId, inputName) {
+	    var currentStackFrame = thread.peekStackFrame();
+	    // Push to the stack to evaluate the reporter block.
+	    thread.pushStack(blockId);
+	    // Save name of input for `Thread.pushReportedValue`.
+	    currentStackFrame.waitingReporter = inputName;
+	    // Actually execute the block.
+	    this.startThread(thread);
+	    // If a reporter yielded, caller must wait for it to unyield.
+	    // The value will be populated once the reporter unyields,
+	    // and passed up to the currentStackFrame on next execution.
+	    return thread.status === Thread.STATUS_YIELD;
+	};
+
+	/**
+	 * Finish stepping a thread and proceed it to the next block.
+	 * @param {!Thread} thread Thread object to proceed.
+	 */
+	Sequencer.prototype.proceedThread = function (thread) {
+	    var currentBlockId = thread.peekStack();
+	    // Mark the status as done and proceed to the next block.
+	    // Pop from the stack - finished this level of execution.
+	    thread.popStack();
+	    // Push next connected block, if there is one.
+	    var nextBlockId = (this.runtime.targetForThread(thread).
+	        blocks.getNextBlock(currentBlockId));
+	    if (nextBlockId) {
+	        thread.pushStack(nextBlockId);
+	    }
+	    // If we can't find a next block to run, mark the thread as done.
+	    if (!thread.peekStack()) {
+	        thread.setStatus(Thread.STATUS_DONE);
 	    }
 	};
 
 	/**
-	 * Clear all graphic effects on this clone.
+	 * Retire a thread in the middle, without considering further blocks.
+	 * @param {!Thread} thread Thread object to retire.
 	 */
-	Clone.prototype.clearEffects = function () {
-	    for (var effectName in this.effects) {
-	        this.effects[effectName] = 0;
-	    }
-	    if (this.renderer) {
-	        this.renderer.updateDrawableProperties(this.drawableID, this.effects);
-	    }
+	Sequencer.prototype.retireThread = function (thread) {
+	    thread.stack = [];
+	    thread.stackFrame = [];
+	    thread.setStatus(Thread.STATUS_DONE);
 	};
 
-	module.exports = Clone;
+	module.exports = Sequencer;
 
 
 /***/ },
 /* 8 */
+/***/ function(module, exports) {
+
+	/**
+	 * @fileoverview
+	 * A utility for accurately measuring time.
+	 * To use:
+	 * ---
+	 * var timer = new Timer();
+	 * timer.start();
+	 * ... pass some time ...
+	 * var timeDifference = timer.timeElapsed();
+	 * ---
+	 * Or, you can use the `time` and `relativeTime`
+	 * to do some measurement yourself.
+	 */
+
+	/**
+	 * @constructor
+	 */
+	function Timer () {}
+
+	/**
+	 * Used to store the start time of a timer action.
+	 * Updated when calling `timer.start`.
+	 */
+	Timer.prototype.startTime = 0;
+
+	/**
+	 * Return the currently known absolute time, in ms precision.
+	 * @returns {number} ms elapsed since 1 January 1970 00:00:00 UTC.
+	 */
+	Timer.prototype.time = function () {
+	    if (Date.now) {
+	        return Date.now();
+	    } else {
+	        return new Date().getTime();
+	    }
+	};
+
+	/**
+	 * Returns a time accurate relative to other times produced by this function.
+	 * If possible, will use sub-millisecond precision.
+	 * If not, will use millisecond precision.
+	 * Not guaranteed to produce the same absolute values per-system.
+	 * @returns {number} ms-scale accurate time relative to other relative times.
+	 */
+	Timer.prototype.relativeTime = function () {
+	    if (typeof self !== 'undefined' &&
+	        self.performance && 'now' in self.performance) {
+	        return self.performance.now();
+	    } else {
+	        return this.time();
+	    }
+	};
+
+	/**
+	 * Start a timer for measuring elapsed time,
+	 * at the most accurate precision possible.
+	 */
+	Timer.prototype.start = function () {
+	    this.startTime = this.relativeTime();
+	};
+
+	/**
+	 * Check time elapsed since `timer.start` was called.
+	 * @returns {number} Time elapsed, in ms (possibly sub-ms precision).
+	 */
+	Timer.prototype.timeElapsed = function () {
+	    return this.relativeTime() - this.startTime;
+	};
+
+	module.exports = Timer;
+
+
+/***/ },
+/* 9 */
+/***/ function(module, exports) {
+
+	/**
+	 * A thread is a running stack context and all the metadata needed.
+	 * @param {?string} firstBlock First block to execute in the thread.
+	 * @constructor
+	 */
+	function Thread (firstBlock) {
+	    /**
+	     * ID of top block of the thread
+	     * @type {!string}
+	     */
+	    this.topBlock = firstBlock;
+
+	    /**
+	     * Stack for the thread. When the sequencer enters a control structure,
+	     * the block is pushed onto the stack so we know where to exit.
+	     * @type {Array.<string>}
+	     */
+	    this.stack = [];
+
+	    /**
+	     * Stack frames for the thread. Store metadata for the executing blocks.
+	     * @type {Array.<Object>}
+	     */
+	    this.stackFrames = [];
+
+	    /**
+	     * Status of the thread, one of three states (below)
+	     * @type {number}
+	     */
+	    this.status = 0; /* Thread.STATUS_RUNNING */
+
+	    /**
+	     * Whether the thread requests its script to glow during this frame.
+	     * @type {boolean}
+	     */
+	    this.requestScriptGlowInFrame = false;
+	}
+
+	/**
+	 * Thread status for initialized or running thread.
+	 * This is the default state for a thread - execution should run normally,
+	 * stepping from block to block.
+	 * @const
+	 */
+	Thread.STATUS_RUNNING = 0;
+
+	/**
+	 * Thread status for a yielded thread.
+	 * Threads are in this state when a primitive has yielded; execution is paused
+	 * until the relevant primitive unyields.
+	 * @const
+	 */
+	Thread.STATUS_YIELD = 1;
+
+	/**
+	 * Thread status for a single-frame yield.
+	 * @const
+	 */
+	Thread.STATUS_YIELD_FRAME = 2;
+
+	/**
+	 * Thread status for a finished/done thread.
+	 * Thread is in this state when there are no more blocks to execute.
+	 * @const
+	 */
+	Thread.STATUS_DONE = 3;
+
+	/**
+	 * Push stack and update stack frames appropriately.
+	 * @param {string} blockId Block ID to push to stack.
+	 */
+	Thread.prototype.pushStack = function (blockId) {
+	    this.stack.push(blockId);
+	    // Push an empty stack frame, if we need one.
+	    // Might not, if we just popped the stack.
+	    if (this.stack.length > this.stackFrames.length) {
+	        this.stackFrames.push({
+	            reported: {}, // Collects reported input values.
+	            waitingReporter: null, // Name of waiting reporter.
+	            executionContext: {} // A context passed to block implementations.
+	        });
+	    }
+	};
+
+	/**
+	 * Pop last block on the stack and its stack frame.
+	 * @return {string} Block ID popped from the stack.
+	 */
+	Thread.prototype.popStack = function () {
+	    this.stackFrames.pop();
+	    return this.stack.pop();
+	};
+
+	/**
+	 * Get top stack item.
+	 * @return {?string} Block ID on top of stack.
+	 */
+	Thread.prototype.peekStack = function () {
+	    return this.stack[this.stack.length - 1];
+	};
+
+
+	/**
+	 * Get top stack frame.
+	 * @return {?Object} Last stack frame stored on this thread.
+	 */
+	Thread.prototype.peekStackFrame = function () {
+	    return this.stackFrames[this.stackFrames.length - 1];
+	};
+
+	/**
+	 * Get stack frame above the current top.
+	 * @return {?Object} Second to last stack frame stored on this thread.
+	 */
+	Thread.prototype.peekParentStackFrame = function () {
+	    return this.stackFrames[this.stackFrames.length - 2];
+	};
+
+	/**
+	 * Push a reported value to the parent of the current stack frame.
+	 * @param {!Any} value Reported value to push.
+	 */
+	Thread.prototype.pushReportedValue = function (value) {
+	    var parentStackFrame = this.peekParentStackFrame();
+	    if (parentStackFrame) {
+	        var waitingReporter = parentStackFrame.waitingReporter;
+	        parentStackFrame.reported[waitingReporter] = value;
+	        parentStackFrame.waitingReporter = null;
+	    }
+	};
+
+	/**
+	 * Whether the current execution of a thread is at the top of the stack.
+	 * @return {Boolean} True if execution is at top of the stack.
+	 */
+	Thread.prototype.atStackTop = function () {
+	    return this.peekStack() === this.topBlock;
+	};
+
+	/**
+	 * Set thread status.
+	 * @param {number} status Enum representing thread status.
+	 */
+	Thread.prototype.setStatus = function (status) {
+	    this.status = status;
+	};
+
+	module.exports = Thread;
+
+
+/***/ },
+/* 10 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Thread = __webpack_require__(9);
+
+	/**
+	 * Utility function to determine if a value is a Promise.
+	 * @param {*} value Value to check for a Promise.
+	 * @return {Boolean} True if the value appears to be a Promise.
+	 */
+	var isPromise = function (value) {
+	    return value && value.then && typeof value.then === 'function';
+	};
+
+	/**
+	 * Execute a block.
+	 * @param {!Sequencer} sequencer Which sequencer is executing.
+	 * @param {!Thread} thread Thread which to read and execute.
+	 */
+	var execute = function (sequencer, thread) {
+	    var runtime = sequencer.runtime;
+	    var target = runtime.targetForThread(thread);
+
+	    // Current block to execute is the one on the top of the stack.
+	    var currentBlockId = thread.peekStack();
+	    var currentStackFrame = thread.peekStackFrame();
+
+	    // Query info about the block.
+	    var opcode = target.blocks.getOpcode(currentBlockId);
+	    var blockFunction = runtime.getOpcodeFunction(opcode);
+	    var isHat = runtime.getIsHat(opcode);
+	    var fields = target.blocks.getFields(currentBlockId);
+	    var inputs = target.blocks.getInputs(currentBlockId);
+
+	    if (!opcode) {
+	        console.warn('Could not get opcode for block: ' + currentBlockId);
+	        return;
+	    }
+
+	    /**
+	     * Handle any reported value from the primitive, either directly returned
+	     * or after a promise resolves.
+	     * @param {*} resolvedValue Value eventually returned from the primitive.
+	     */
+	    var handleReport = function (resolvedValue) {
+	        thread.pushReportedValue(resolvedValue);
+	        if (isHat) {
+	            // Hat predicate was evaluated.
+	            if (runtime.getIsEdgeActivatedHat(opcode)) {
+	                // If this is an edge-activated hat, only proceed if
+	                // the value is true and used to be false.
+	                var oldEdgeValue = runtime.updateEdgeActivatedValue(
+	                    currentBlockId,
+	                    resolvedValue
+	                );
+	                var edgeWasActivated = !oldEdgeValue && resolvedValue;
+	                if (!edgeWasActivated) {
+	                    sequencer.retireThread(thread);
+	                }
+	            } else {
+	                // Not an edge-activated hat: retire the thread
+	                // if predicate was false.
+	                if (!resolvedValue) {
+	                    sequencer.retireThread(thread);
+	                }
+	            }
+	        } else {
+	            // In a non-hat, report the value visually if necessary if
+	            // at the top of the thread stack.
+	            if (typeof resolvedValue !== 'undefined' && thread.atStackTop()) {
+	                runtime.visualReport(currentBlockId, resolvedValue);
+	            }
+	            // Finished any yields.
+	            thread.setStatus(Thread.STATUS_RUNNING);
+	        }
+	    };
+
+	    // Hats and single-field shadows are implemented slightly differently
+	    // from regular blocks.
+	    // For hats: if they have an associated block function,
+	    // it's treated as a predicate; if not, execution will proceed as a no-op.
+	    // For single-field shadows: If the block has a single field, and no inputs,
+	    // immediately return the value of the field.
+	    if (!blockFunction) {
+	        if (isHat) {
+	            // Skip through the block (hat with no predicate).
+	            return;
+	        } else {
+	            if (Object.keys(fields).length == 1 &&
+	                Object.keys(inputs).length == 0) {
+	                // One field and no inputs - treat as arg.
+	                for (var fieldKey in fields) { // One iteration.
+	                    handleReport(fields[fieldKey].value);
+	                }
+	            } else {
+	                console.warn('Could not get implementation for opcode: ' +
+	                    opcode);
+	            }
+	            thread.requestScriptGlowInFrame = true;
+	            return;
+	        }
+	    }
+
+	    // Generate values for arguments (inputs).
+	    var argValues = {};
+
+	    // Add all fields on this block to the argValues.
+	    for (var fieldName in fields) {
+	        argValues[fieldName] = fields[fieldName].value;
+	    }
+
+	    // Recursively evaluate input blocks.
+	    for (var inputName in inputs) {
+	        var input = inputs[inputName];
+	        var inputBlockId = input.block;
+	        // Is there no value for this input waiting in the stack frame?
+	        if (typeof currentStackFrame.reported[inputName] === 'undefined') {
+	            // If there's not, we need to evaluate the block.
+	            var reporterYielded = (
+	                sequencer.stepToReporter(thread, inputBlockId, inputName)
+	            );
+	            // If the reporter yielded, return immediately;
+	            // it needs time to finish and report its value.
+	            if (reporterYielded) {
+	                return;
+	            }
+	        }
+	        argValues[inputName] = currentStackFrame.reported[inputName];
+	    }
+
+	    // If we've gotten this far, all of the input blocks are evaluated,
+	    // and `argValues` is fully populated. So, execute the block primitive.
+	    // First, clear `currentStackFrame.reported`, so any subsequent execution
+	    // (e.g., on return from a branch) gets fresh inputs.
+	    currentStackFrame.reported = {};
+
+	    var primitiveReportedValue = null;
+	    primitiveReportedValue = blockFunction(argValues, {
+	        stackFrame: currentStackFrame.executionContext,
+	        target: target,
+	        yield: function() {
+	            thread.setStatus(Thread.STATUS_YIELD);
+	        },
+	        yieldFrame: function() {
+	            thread.setStatus(Thread.STATUS_YIELD_FRAME);
+	        },
+	        done: function() {
+	            thread.setStatus(Thread.STATUS_RUNNING);
+	            sequencer.proceedThread(thread);
+	        },
+	        startBranch: function (branchNum) {
+	            sequencer.stepToBranch(thread, branchNum);
+	        },
+	        startHats: function(requestedHat, opt_matchFields, opt_target) {
+	            return (
+	                runtime.startHats(requestedHat, opt_matchFields, opt_target)
+	            );
+	        },
+	        ioQuery: function (device, func, args) {
+	            // Find the I/O device and execute the query/function call.
+	            if (runtime.ioDevices[device] && runtime.ioDevices[device][func]) {
+	                var devObject = runtime.ioDevices[device];
+	                return devObject[func].call(devObject, args);
+	            }
+	        }
+	    });
+
+	    if (typeof primitiveReportedValue === 'undefined') {
+	        // No value reported - potentially a command block.
+	        // Edge-activated hats don't request a glow; all commands do.
+	        thread.requestScriptGlowInFrame = true;
+	    }
+
+	    // If it's a promise, wait until promise resolves.
+	    if (isPromise(primitiveReportedValue)) {
+	        if (thread.status === Thread.STATUS_RUNNING) {
+	            // Primitive returned a promise; automatically yield thread.
+	            thread.setStatus(Thread.STATUS_YIELD);
+	        }
+	        // Promise handlers
+	        primitiveReportedValue.then(function(resolvedValue) {
+	            handleReport(resolvedValue);
+	            sequencer.proceedThread(thread);
+	        }, function(rejectionReason) {
+	            // Promise rejected: the primitive had some error.
+	            // Log it and proceed.
+	            console.warn('Primitive rejected promise: ', rejectionReason);
+	            thread.setStatus(Thread.STATUS_RUNNING);
+	            sequencer.proceedThread(thread);
+	        });
+	    } else if (thread.status === Thread.STATUS_RUNNING) {
+	        handleReport(primitiveReportedValue);
+	    }
+	};
+
+	module.exports = execute;
+
+
+/***/ },
+/* 11 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Timer = __webpack_require__(8);
+
+	function Clock () {
+	    this._projectTimer = new Timer();
+	    this._projectTimer.start();
+	}
+
+	Clock.prototype.projectTimer = function () {
+	    return this._projectTimer.timeElapsed() / 1000;
+	};
+
+	Clock.prototype.resetProjectTimer = function () {
+	    this._projectTimer.start();
+	};
+
+	module.exports = Clock;
+
+
+/***/ },
+/* 12 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Cast = __webpack_require__(13);
+
+	function Keyboard (runtime) {
+	    /**
+	     * List of currently pressed keys.
+	     * @type{Array.<number>}
+	     */
+	    this._keysPressed = [];
+	    /**
+	     * Reference to the owning Runtime.
+	     * Can be used, for example, to activate hats.
+	     * @type{!Runtime}
+	     */
+	    this.runtime = runtime;
+	}
+
+	/**
+	 * Convert a Scratch key name to a DOM keyCode.
+	 * @param {Any} keyName Scratch key argument.
+	 * @return {number} Key code corresponding to a DOM event.
+	 */
+	Keyboard.prototype._scratchKeyToKeyCode = function (keyName) {
+	    if (typeof keyName == 'number') {
+	        // Key codes placed in with number blocks.
+	        return keyName;
+	    }
+	    var keyString = Cast.toString(keyName);
+	    switch (keyString) {
+	    case 'space': return 32;
+	    case 'left arrow': return 37;
+	    case 'up arrow': return 38;
+	    case 'right arrow': return 39;
+	    case 'down arrow': return 40;
+	    // @todo: Consider adding other special keys here.
+	    }
+	    // Keys reported by DOM keyCode are upper case.
+	    return keyString.toUpperCase().charCodeAt(0);
+	};
+
+	Keyboard.prototype._keyCodeToScratchKey = function (keyCode) {
+	    if (keyCode >= 48 && keyCode <= 90) {
+	        // Standard letter.
+	        return String.fromCharCode(keyCode).toLowerCase();
+	    }
+	    switch (keyCode) {
+	    case 32: return 'space';
+	    case 37: return 'left arrow';
+	    case 38: return 'up arrow';
+	    case 39: return 'right arrow';
+	    case 40: return 'down arrow';
+	    }
+	    return null;
+	};
+
+	Keyboard.prototype.postData = function (data) {
+	    if (data.keyCode) {
+	        var index = this._keysPressed.indexOf(data.keyCode);
+	        if (data.isDown) {
+	            // If not already present, add to the list.
+	            if (index < 0) {
+	                this._keysPressed.push(data.keyCode);
+	            }
+	            // Always trigger hats, even if it was already pressed.
+	            this.runtime.startHats('event_whenkeypressed', {
+	                'KEY_OPTION': this._keyCodeToScratchKey(data.keyCode)
+	            });
+	            this.runtime.startHats('event_whenkeypressed', {
+	                'KEY_OPTION': 'any'
+	            });
+	        } else if (index > -1) {
+	            // If already present, remove from the list.
+	            this._keysPressed.splice(index, 1);
+	        }
+	    }
+	};
+
+	Keyboard.prototype.getKeyIsDown = function (key) {
+	    if (key == 'any') {
+	        return this._keysPressed.length > 0;
+	    }
+	    var keyCode = this._scratchKeyToKeyCode(key);
+	    return this._keysPressed.indexOf(keyCode) > -1;
+	};
+
+	module.exports = Keyboard;
+
+
+/***/ },
+/* 13 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Color = __webpack_require__(14);
+
+	function Cast () {}
+
+	/**
+	 * @fileoverview
+	 * Utilities for casting and comparing Scratch data-types.
+	 * Scratch behaves slightly differently from JavaScript in many respects,
+	 * and these differences should be encapsulated below.
+	 * For example, in Scratch, add(1, join("hello", world")) -> 1.
+	 * This is because "hello world" is cast to 0.
+	 * In JavaScript, 1 + Number("hello" + "world") would give you NaN.
+	 * Use when coercing a value before computation.
+	 */
+
+	/**
+	 * Scratch cast to number.
+	 * Treats NaN as 0.
+	 * In Scratch 2.0, this is captured by `interp.numArg.`
+	 * @param {*} value Value to cast to number.
+	 * @return {number} The Scratch-casted number value.
+	 */
+	Cast.toNumber = function (value) {
+	    var n = Number(value);
+	    if (isNaN(n)) {
+	        // Scratch treats NaN as 0, when needed as a number.
+	        // E.g., 0 + NaN -> 0.
+	        return 0;
+	    }
+	    return n;
+	};
+
+	/**
+	 * Scratch cast to boolean.
+	 * In Scratch 2.0, this is captured by `interp.boolArg.`
+	 * Treats some string values differently from JavaScript.
+	 * @param {*} value Value to cast to boolean.
+	 * @return {boolean} The Scratch-casted boolean value.
+	 */
+	Cast.toBoolean = function (value) {
+	    // Already a boolean?
+	    if (typeof value === 'boolean') {
+	        return value;
+	    }
+	    if (typeof value === 'string') {
+	        // These specific strings are treated as false in Scratch.
+	        if ((value == '') ||
+	            (value == '0') ||
+	            (value.toLowerCase() == 'false')) {
+	            return false;
+	        }
+	        // All other strings treated as true.
+	        return true;
+	    }
+	    // Coerce other values and numbers.
+	    return Boolean(value);
+	};
+
+	/**
+	 * Scratch cast to string.
+	 * @param {*} value Value to cast to string.
+	 * @return {string} The Scratch-casted string value.
+	 */
+	Cast.toString = function (value) {
+	    return String(value);
+	};
+
+	/**
+	 * Cast any Scratch argument to an RGB color object to be used for the renderer.
+	 * @param {*} value Value to convert to RGB color object.
+	 * @return {Array.<number>} [r,g,b], values between 0-255.
+	 */
+	Cast.toRgbColorList = function (value) {
+	    var color;
+	    if (typeof value == 'string' && value.substring(0, 1) == '#') {
+	        color = Color.hexToRgb(value);
+	    } else {
+	        color = Color.decimalToRgb(Cast.toNumber(value));
+	    }
+	    return [color.r, color.g, color.b];
+	};
+
+	/**
+	 * Compare two values, using Scratch cast, case-insensitive string compare, etc.
+	 * In Scratch 2.0, this is captured by `interp.compare.`
+	 * @param {*} v1 First value to compare.
+	 * @param {*} v2 Second value to compare.
+	 * @returns {Number} Negative number if v1 < v2; 0 if equal; positive otherwise.
+	 */
+	Cast.compare = function (v1, v2) {
+	    var n1 = Number(v1);
+	    var n2 = Number(v2);
+	    if (isNaN(n1) || isNaN(n2)) {
+	        // At least one argument can't be converted to a number.
+	        // Scratch compares strings as case insensitive.
+	        var s1 = String(v1).toLowerCase();
+	        var s2 = String(v2).toLowerCase();
+	        return s1.localeCompare(s2);
+	    } else {
+	        // Compare as numbers.
+	        return n1 - n2;
+	    }
+	};
+
+	module.exports = Cast;
+
+
+/***/ },
+/* 14 */
+/***/ function(module, exports) {
+
+	function Color () {}
+
+	/**
+	 * Convert a Scratch decimal color to a hex string, #RRGGBB.
+	 * @param {number} decimal RGB color as a decimal.
+	 * @return {string} RGB color as #RRGGBB hex string.
+	 */
+	Color.decimalToHex = function (decimal) {
+	    if (decimal < 0) {
+	        decimal += 0xFFFFFF + 1;
+	    }
+	    var hex = Number(decimal).toString(16);
+	    hex = '#' + '000000'.substr(0, 6 - hex.length) + hex;
+	    return hex;
+	};
+
+	/**
+	 * Convert a Scratch decimal color to an RGB color object.
+	 * @param {number} decimal RGB color as decimal.
+	 * @returns {Object} {r: R, g: G, b: B}, values between 0-255
+	 */
+	Color.decimalToRgb = function (decimal) {
+	    var r = (decimal >> 16) & 0xFF;
+	    var g = (decimal >> 8) & 0xFF;
+	    var b = decimal & 0xFF;
+	    return {r: r, g: g, b: b};
+	};
+
+	/**
+	 * Convert a hex color (e.g., F00, #03F, #0033FF) to an RGB color object.
+	 * CC-BY-SA Tim Down:
+	 * https://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
+	 * @param {!string} hex Hex representation of the color.
+	 * @return {Object} {r: R, g: G, b: B}, 0-255, or null.
+	 */
+	Color.hexToRgb = function (hex) {
+	    var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
+	    hex = hex.replace(shorthandRegex, function(m, r, g, b) {
+	        return r + r + g + g + b + b;
+	    });
+	    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+	    return result ? {
+	        r: parseInt(result[1], 16),
+	        g: parseInt(result[2], 16),
+	        b: parseInt(result[3], 16)
+	    } : null;
+	};
+
+	/**
+	 * Convert an RGB color object to a hex color.
+	 * @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
+	 * @return {!string} Hex representation of the color.
+	 */
+	Color.rgbToHex = function (rgb) {
+	    return Color.decimalToHex(Color.rgbToDecimal(rgb));
+	};
+
+	/**
+	 * Convert an RGB color object to a Scratch decimal color.
+	 * @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
+	 * @return {!number} Number representing the color.
+	 */
+	Color.rgbToDecimal = function (rgb) {
+	    return (rgb.r << 16) + (rgb.g << 8) + rgb.b;
+	};
+
+	/**
+	* Convert a hex color (e.g., F00, #03F, #0033FF) to a decimal color number.
+	* @param {!string} hex Hex representation of the color.
+	* @return {!number} Number representing the color.
+	*/
+	Color.hexToDecimal = function (hex) {
+	    return Color.rgbToDecimal(Color.hexToRgb(hex));
+	};
+
+	module.exports = Color;
+
+
+/***/ },
+/* 15 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var MathUtil = __webpack_require__(16);
+
+	function Mouse (runtime) {
+	    this._x = 0;
+	    this._y = 0;
+	    this._isDown = false;
+	    /**
+	     * Reference to the owning Runtime.
+	     * Can be used, for example, to activate hats.
+	     * @type{!Runtime}
+	     */
+	    this.runtime = runtime;
+	}
+
+	Mouse.prototype.postData = function(data) {
+	    if (data.x) {
+	        this._x = data.x - data.canvasWidth / 2;
+	    }
+	    if (data.y) {
+	        this._y = data.y - data.canvasHeight / 2;
+	    }
+	    if (typeof data.isDown !== 'undefined') {
+	        this._isDown = data.isDown;
+	        if (this._isDown) {
+	            this._activateClickHats(data.x, data.y);
+	        }
+	    }
+	};
+
+	Mouse.prototype._activateClickHats = function (x, y) {
+	    if (self.renderer) {
+	        var pickPromise = self.renderer.pick(x, y);
+	        var instance = this;
+	        pickPromise.then(function(drawableID) {
+	            for (var i = 0; i < instance.runtime.targets.length; i++) {
+	                var target = instance.runtime.targets[i];
+	                if (target.hasOwnProperty('drawableID') &&
+	                    target.drawableID == drawableID) {
+	                    instance.runtime.startHats('event_whenthisspriteclicked',
+	                        null, target);
+	                    return;
+	                }
+	            }
+	        });
+	    }
+	};
+
+	Mouse.prototype.getX = function () {
+	    return MathUtil.clamp(this._x, -240, 240);
+	};
+
+	Mouse.prototype.getY = function () {
+	    return MathUtil.clamp(-this._y, -180, 180);
+	};
+
+	Mouse.prototype.getIsDown = function () {
+	    return this._isDown;
+	};
+
+	module.exports = Mouse;
+
+
+/***/ },
+/* 16 */
 /***/ function(module, exports) {
 
 	function MathUtil () {}
@@ -1553,36 +2939,2026 @@
 
 
 /***/ },
-/* 9 */
+/* 17 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var Blocks = __webpack_require__(10);
+	var Cast = __webpack_require__(13);
+	var Promise = __webpack_require__(18);
 
-	/**
-	 * @fileoverview
-	 * A Target is an abstract "code-running" object for the Scratch VM.
-	 * Examples include sprites/clones or potentially physical-world devices.
-	 */
-
-	/**
-	 * @param {?Blocks} blocks Blocks instance for the blocks owned by this target.
-	 * @constructor
-	 */
-	function Target (blocks) {
-	    if (!blocks) {
-	        blocks = new Blocks(this);
-	    }
-	    this.blocks = blocks;
+	function Scratch3ControlBlocks(runtime) {
+	    /**
+	     * The runtime instantiating this block package.
+	     * @type {Runtime}
+	     */
+	    this.runtime = runtime;
 	}
 
-	module.exports = Target;
+	/**
+	 * Retrieve the block primitives implemented by this package.
+	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 */
+	Scratch3ControlBlocks.prototype.getPrimitives = function() {
+	    return {
+	        'control_repeat': this.repeat,
+	        'control_repeat_until': this.repeatUntil,
+	        'control_forever': this.forever,
+	        'control_wait': this.wait,
+	        'control_if': this.if,
+	        'control_if_else': this.ifElse,
+	        'control_stop': this.stop
+	    };
+	};
+
+	Scratch3ControlBlocks.prototype.repeat = function(args, util) {
+	    var times = Math.floor(Cast.toNumber(args.TIMES));
+	    // Initialize loop
+	    if (util.stackFrame.loopCounter === undefined) {
+	        util.stackFrame.loopCounter = times;
+	    }
+	    // Only execute once per frame.
+	    // When the branch finishes, `repeat` will be executed again and
+	    // the second branch will be taken, yielding for the rest of the frame.
+	    if (!util.stackFrame.executedInFrame) {
+	        util.stackFrame.executedInFrame = true;
+	        // Decrease counter
+	        util.stackFrame.loopCounter--;
+	        // If we still have some left, start the branch.
+	        if (util.stackFrame.loopCounter >= 0) {
+	            util.startBranch();
+	        }
+	    } else {
+	        util.stackFrame.executedInFrame = false;
+	        util.yieldFrame();
+	    }
+	};
+
+	Scratch3ControlBlocks.prototype.repeatUntil = function(args, util) {
+	    var condition = Cast.toBoolean(args.CONDITION);
+	    // Only execute once per frame.
+	    // When the branch finishes, `repeat` will be executed again and
+	    // the second branch will be taken, yielding for the rest of the frame.
+	    if (!util.stackFrame.executedInFrame) {
+	        util.stackFrame.executedInFrame = true;
+	        // If the condition is true, start the branch.
+	        if (!condition) {
+	            util.startBranch();
+	        }
+	    } else {
+	        util.stackFrame.executedInFrame = false;
+	        util.yieldFrame();
+	    }
+	};
+
+	Scratch3ControlBlocks.prototype.forever = function(args, util) {
+	    // Only execute once per frame.
+	    // When the branch finishes, `forever` will be executed again and
+	    // the second branch will be taken, yielding for the rest of the frame.
+	    if (!util.stackFrame.executedInFrame) {
+	        util.stackFrame.executedInFrame = true;
+	        util.startBranch();
+	    } else {
+	        util.stackFrame.executedInFrame = false;
+	        util.yieldFrame();
+	    }
+	};
+
+	Scratch3ControlBlocks.prototype.wait = function(args) {
+	    var duration = Cast.toNumber(args.DURATION);
+	    return new Promise(function(resolve) {
+	        setTimeout(function() {
+	            resolve();
+	        }, 1000 * duration);
+	    });
+	};
+
+	Scratch3ControlBlocks.prototype.if = function(args, util) {
+	    var condition = Cast.toBoolean(args.CONDITION);
+	    // Only execute one time. `if` will be returned to
+	    // when the branch finishes, but it shouldn't execute again.
+	    if (util.stackFrame.executedInFrame === undefined) {
+	        util.stackFrame.executedInFrame = true;
+	        if (condition) {
+	            util.startBranch();
+	        }
+	    }
+	};
+
+	Scratch3ControlBlocks.prototype.ifElse = function(args, util) {
+	    var condition = Cast.toBoolean(args.CONDITION);
+	    // Only execute one time. `ifElse` will be returned to
+	    // when the branch finishes, but it shouldn't execute again.
+	    if (util.stackFrame.executedInFrame === undefined) {
+	        util.stackFrame.executedInFrame = true;
+	        if (condition) {
+	            util.startBranch(1);
+	        } else {
+	            util.startBranch(2);
+	        }
+	    }
+	};
+
+	Scratch3ControlBlocks.prototype.stop = function() {
+	    // @todo - don't use this.runtime
+	    this.runtime.stopAll();
+	};
+
+	module.exports = Scratch3ControlBlocks;
 
 
 /***/ },
-/* 10 */
+/* 18 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var adapter = __webpack_require__(11);
+	'use strict';
+
+	module.exports = __webpack_require__(19)
+
+
+/***/ },
+/* 19 */
+/***/ function(module, exports, __webpack_require__) {
+
+	'use strict';
+
+	module.exports = __webpack_require__(20);
+	__webpack_require__(22);
+	__webpack_require__(23);
+	__webpack_require__(24);
+	__webpack_require__(25);
+	__webpack_require__(27);
+
+
+/***/ },
+/* 20 */
+/***/ function(module, exports, __webpack_require__) {
+
+	'use strict';
+
+	var asap = __webpack_require__(21);
+
+	function noop() {}
+
+	// States:
+	//
+	// 0 - pending
+	// 1 - fulfilled with _value
+	// 2 - rejected with _value
+	// 3 - adopted the state of another promise, _value
+	//
+	// once the state is no longer pending (0) it is immutable
+
+	// All `_` prefixed properties will be reduced to `_{random number}`
+	// at build time to obfuscate them and discourage their use.
+	// We don't use symbols or Object.defineProperty to fully hide them
+	// because the performance isn't good enough.
+
+
+	// to avoid using try/catch inside critical functions, we
+	// extract them to here.
+	var LAST_ERROR = null;
+	var IS_ERROR = {};
+	function getThen(obj) {
+	  try {
+	    return obj.then;
+	  } catch (ex) {
+	    LAST_ERROR = ex;
+	    return IS_ERROR;
+	  }
+	}
+
+	function tryCallOne(fn, a) {
+	  try {
+	    return fn(a);
+	  } catch (ex) {
+	    LAST_ERROR = ex;
+	    return IS_ERROR;
+	  }
+	}
+	function tryCallTwo(fn, a, b) {
+	  try {
+	    fn(a, b);
+	  } catch (ex) {
+	    LAST_ERROR = ex;
+	    return IS_ERROR;
+	  }
+	}
+
+	module.exports = Promise;
+
+	function Promise(fn) {
+	  if (typeof this !== 'object') {
+	    throw new TypeError('Promises must be constructed via new');
+	  }
+	  if (typeof fn !== 'function') {
+	    throw new TypeError('not a function');
+	  }
+	  this._45 = 0;
+	  this._81 = 0;
+	  this._65 = null;
+	  this._54 = null;
+	  if (fn === noop) return;
+	  doResolve(fn, this);
+	}
+	Promise._10 = null;
+	Promise._97 = null;
+	Promise._61 = noop;
+
+	Promise.prototype.then = function(onFulfilled, onRejected) {
+	  if (this.constructor !== Promise) {
+	    return safeThen(this, onFulfilled, onRejected);
+	  }
+	  var res = new Promise(noop);
+	  handle(this, new Handler(onFulfilled, onRejected, res));
+	  return res;
+	};
+
+	function safeThen(self, onFulfilled, onRejected) {
+	  return new self.constructor(function (resolve, reject) {
+	    var res = new Promise(noop);
+	    res.then(resolve, reject);
+	    handle(self, new Handler(onFulfilled, onRejected, res));
+	  });
+	};
+	function handle(self, deferred) {
+	  while (self._81 === 3) {
+	    self = self._65;
+	  }
+	  if (Promise._10) {
+	    Promise._10(self);
+	  }
+	  if (self._81 === 0) {
+	    if (self._45 === 0) {
+	      self._45 = 1;
+	      self._54 = deferred;
+	      return;
+	    }
+	    if (self._45 === 1) {
+	      self._45 = 2;
+	      self._54 = [self._54, deferred];
+	      return;
+	    }
+	    self._54.push(deferred);
+	    return;
+	  }
+	  handleResolved(self, deferred);
+	}
+
+	function handleResolved(self, deferred) {
+	  asap(function() {
+	    var cb = self._81 === 1 ? deferred.onFulfilled : deferred.onRejected;
+	    if (cb === null) {
+	      if (self._81 === 1) {
+	        resolve(deferred.promise, self._65);
+	      } else {
+	        reject(deferred.promise, self._65);
+	      }
+	      return;
+	    }
+	    var ret = tryCallOne(cb, self._65);
+	    if (ret === IS_ERROR) {
+	      reject(deferred.promise, LAST_ERROR);
+	    } else {
+	      resolve(deferred.promise, ret);
+	    }
+	  });
+	}
+	function resolve(self, newValue) {
+	  // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure
+	  if (newValue === self) {
+	    return reject(
+	      self,
+	      new TypeError('A promise cannot be resolved with itself.')
+	    );
+	  }
+	  if (
+	    newValue &&
+	    (typeof newValue === 'object' || typeof newValue === 'function')
+	  ) {
+	    var then = getThen(newValue);
+	    if (then === IS_ERROR) {
+	      return reject(self, LAST_ERROR);
+	    }
+	    if (
+	      then === self.then &&
+	      newValue instanceof Promise
+	    ) {
+	      self._81 = 3;
+	      self._65 = newValue;
+	      finale(self);
+	      return;
+	    } else if (typeof then === 'function') {
+	      doResolve(then.bind(newValue), self);
+	      return;
+	    }
+	  }
+	  self._81 = 1;
+	  self._65 = newValue;
+	  finale(self);
+	}
+
+	function reject(self, newValue) {
+	  self._81 = 2;
+	  self._65 = newValue;
+	  if (Promise._97) {
+	    Promise._97(self, newValue);
+	  }
+	  finale(self);
+	}
+	function finale(self) {
+	  if (self._45 === 1) {
+	    handle(self, self._54);
+	    self._54 = null;
+	  }
+	  if (self._45 === 2) {
+	    for (var i = 0; i < self._54.length; i++) {
+	      handle(self, self._54[i]);
+	    }
+	    self._54 = null;
+	  }
+	}
+
+	function Handler(onFulfilled, onRejected, promise){
+	  this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
+	  this.onRejected = typeof onRejected === 'function' ? onRejected : null;
+	  this.promise = promise;
+	}
+
+	/**
+	 * Take a potentially misbehaving resolver function and make sure
+	 * onFulfilled and onRejected are only called once.
+	 *
+	 * Makes no guarantees about asynchrony.
+	 */
+	function doResolve(fn, promise) {
+	  var done = false;
+	  var res = tryCallTwo(fn, function (value) {
+	    if (done) return;
+	    done = true;
+	    resolve(promise, value);
+	  }, function (reason) {
+	    if (done) return;
+	    done = true;
+	    reject(promise, reason);
+	  })
+	  if (!done && res === IS_ERROR) {
+	    done = true;
+	    reject(promise, LAST_ERROR);
+	  }
+	}
+
+
+/***/ },
+/* 21 */
+/***/ function(module, exports) {
+
+	/* WEBPACK VAR INJECTION */(function(global) {"use strict";
+
+	// Use the fastest means possible to execute a task in its own turn, with
+	// priority over other events including IO, animation, reflow, and redraw
+	// events in browsers.
+	//
+	// An exception thrown by a task will permanently interrupt the processing of
+	// subsequent tasks. The higher level `asap` function ensures that if an
+	// exception is thrown by a task, that the task queue will continue flushing as
+	// soon as possible, but if you use `rawAsap` directly, you are responsible to
+	// either ensure that no exceptions are thrown from your task, or to manually
+	// call `rawAsap.requestFlush` if an exception is thrown.
+	module.exports = rawAsap;
+	function rawAsap(task) {
+	    if (!queue.length) {
+	        requestFlush();
+	        flushing = true;
+	    }
+	    // Equivalent to push, but avoids a function call.
+	    queue[queue.length] = task;
+	}
+
+	var queue = [];
+	// Once a flush has been requested, no further calls to `requestFlush` are
+	// necessary until the next `flush` completes.
+	var flushing = false;
+	// `requestFlush` is an implementation-specific method that attempts to kick
+	// off a `flush` event as quickly as possible. `flush` will attempt to exhaust
+	// the event queue before yielding to the browser's own event loop.
+	var requestFlush;
+	// The position of the next task to execute in the task queue. This is
+	// preserved between calls to `flush` so that it can be resumed if
+	// a task throws an exception.
+	var index = 0;
+	// If a task schedules additional tasks recursively, the task queue can grow
+	// unbounded. To prevent memory exhaustion, the task queue will periodically
+	// truncate already-completed tasks.
+	var capacity = 1024;
+
+	// The flush function processes all tasks that have been scheduled with
+	// `rawAsap` unless and until one of those tasks throws an exception.
+	// If a task throws an exception, `flush` ensures that its state will remain
+	// consistent and will resume where it left off when called again.
+	// However, `flush` does not make any arrangements to be called again if an
+	// exception is thrown.
+	function flush() {
+	    while (index < queue.length) {
+	        var currentIndex = index;
+	        // Advance the index before calling the task. This ensures that we will
+	        // begin flushing on the next task the task throws an error.
+	        index = index + 1;
+	        queue[currentIndex].call();
+	        // Prevent leaking memory for long chains of recursive calls to `asap`.
+	        // If we call `asap` within tasks scheduled by `asap`, the queue will
+	        // grow, but to avoid an O(n) walk for every task we execute, we don't
+	        // shift tasks off the queue after they have been executed.
+	        // Instead, we periodically shift 1024 tasks off the queue.
+	        if (index > capacity) {
+	            // Manually shift all values starting at the index back to the
+	            // beginning of the queue.
+	            for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {
+	                queue[scan] = queue[scan + index];
+	            }
+	            queue.length -= index;
+	            index = 0;
+	        }
+	    }
+	    queue.length = 0;
+	    index = 0;
+	    flushing = false;
+	}
+
+	// `requestFlush` is implemented using a strategy based on data collected from
+	// every available SauceLabs Selenium web driver worker at time of writing.
+	// https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593
+
+	// Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that
+	// have WebKitMutationObserver but not un-prefixed MutationObserver.
+	// Must use `global` instead of `window` to work in both frames and web
+	// workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.
+	var BrowserMutationObserver = global.MutationObserver || global.WebKitMutationObserver;
+
+	// MutationObservers are desirable because they have high priority and work
+	// reliably everywhere they are implemented.
+	// They are implemented in all modern browsers.
+	//
+	// - Android 4-4.3
+	// - Chrome 26-34
+	// - Firefox 14-29
+	// - Internet Explorer 11
+	// - iPad Safari 6-7.1
+	// - iPhone Safari 7-7.1
+	// - Safari 6-7
+	if (typeof BrowserMutationObserver === "function") {
+	    requestFlush = makeRequestCallFromMutationObserver(flush);
+
+	// MessageChannels are desirable because they give direct access to the HTML
+	// task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera
+	// 11-12, and in web workers in many engines.
+	// Although message channels yield to any queued rendering and IO tasks, they
+	// would be better than imposing the 4ms delay of timers.
+	// However, they do not work reliably in Internet Explorer or Safari.
+
+	// Internet Explorer 10 is the only browser that has setImmediate but does
+	// not have MutationObservers.
+	// Although setImmediate yields to the browser's renderer, it would be
+	// preferrable to falling back to setTimeout since it does not have
+	// the minimum 4ms penalty.
+	// Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and
+	// Desktop to a lesser extent) that renders both setImmediate and
+	// MessageChannel useless for the purposes of ASAP.
+	// https://github.com/kriskowal/q/issues/396
+
+	// Timers are implemented universally.
+	// We fall back to timers in workers in most engines, and in foreground
+	// contexts in the following browsers.
+	// However, note that even this simple case requires nuances to operate in a
+	// broad spectrum of browsers.
+	//
+	// - Firefox 3-13
+	// - Internet Explorer 6-9
+	// - iPad Safari 4.3
+	// - Lynx 2.8.7
+	} else {
+	    requestFlush = makeRequestCallFromTimer(flush);
+	}
+
+	// `requestFlush` requests that the high priority event queue be flushed as
+	// soon as possible.
+	// This is useful to prevent an error thrown in a task from stalling the event
+	// queue if the exception handled by Node.js’s
+	// `process.on("uncaughtException")` or by a domain.
+	rawAsap.requestFlush = requestFlush;
+
+	// To request a high priority event, we induce a mutation observer by toggling
+	// the text of a text node between "1" and "-1".
+	function makeRequestCallFromMutationObserver(callback) {
+	    var toggle = 1;
+	    var observer = new BrowserMutationObserver(callback);
+	    var node = document.createTextNode("");
+	    observer.observe(node, {characterData: true});
+	    return function requestCall() {
+	        toggle = -toggle;
+	        node.data = toggle;
+	    };
+	}
+
+	// The message channel technique was discovered by Malte Ubl and was the
+	// original foundation for this library.
+	// http://www.nonblocking.io/2011/06/windownexttick.html
+
+	// Safari 6.0.5 (at least) intermittently fails to create message ports on a
+	// page's first load. Thankfully, this version of Safari supports
+	// MutationObservers, so we don't need to fall back in that case.
+
+	// function makeRequestCallFromMessageChannel(callback) {
+	//     var channel = new MessageChannel();
+	//     channel.port1.onmessage = callback;
+	//     return function requestCall() {
+	//         channel.port2.postMessage(0);
+	//     };
+	// }
+
+	// For reasons explained above, we are also unable to use `setImmediate`
+	// under any circumstances.
+	// Even if we were, there is another bug in Internet Explorer 10.
+	// It is not sufficient to assign `setImmediate` to `requestFlush` because
+	// `setImmediate` must be called *by name* and therefore must be wrapped in a
+	// closure.
+	// Never forget.
+
+	// function makeRequestCallFromSetImmediate(callback) {
+	//     return function requestCall() {
+	//         setImmediate(callback);
+	//     };
+	// }
+
+	// Safari 6.0 has a problem where timers will get lost while the user is
+	// scrolling. This problem does not impact ASAP because Safari 6.0 supports
+	// mutation observers, so that implementation is used instead.
+	// However, if we ever elect to use timers in Safari, the prevalent work-around
+	// is to add a scroll event listener that calls for a flush.
+
+	// `setTimeout` does not call the passed callback if the delay is less than
+	// approximately 7 in web workers in Firefox 8 through 18, and sometimes not
+	// even then.
+
+	function makeRequestCallFromTimer(callback) {
+	    return function requestCall() {
+	        // We dispatch a timeout with a specified delay of 0 for engines that
+	        // can reliably accommodate that request. This will usually be snapped
+	        // to a 4 milisecond delay, but once we're flushing, there's no delay
+	        // between events.
+	        var timeoutHandle = setTimeout(handleTimer, 0);
+	        // However, since this timer gets frequently dropped in Firefox
+	        // workers, we enlist an interval handle that will try to fire
+	        // an event 20 times per second until it succeeds.
+	        var intervalHandle = setInterval(handleTimer, 50);
+
+	        function handleTimer() {
+	            // Whichever timer succeeds will cancel both timers and
+	            // execute the callback.
+	            clearTimeout(timeoutHandle);
+	            clearInterval(intervalHandle);
+	            callback();
+	        }
+	    };
+	}
+
+	// This is for `asap.js` only.
+	// Its name will be periodically randomized to break any code that depends on
+	// its existence.
+	rawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;
+
+	// ASAP was originally a nextTick shim included in Q. This was factored out
+	// into this ASAP package. It was later adapted to RSVP which made further
+	// amendments. These decisions, particularly to marginalize MessageChannel and
+	// to capture the MutationObserver implementation in a closure, were integrated
+	// back into ASAP proper.
+	// https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js
+
+	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())))
+
+/***/ },
+/* 22 */
+/***/ function(module, exports, __webpack_require__) {
+
+	'use strict';
+
+	var Promise = __webpack_require__(20);
+
+	module.exports = Promise;
+	Promise.prototype.done = function (onFulfilled, onRejected) {
+	  var self = arguments.length ? this.then.apply(this, arguments) : this;
+	  self.then(null, function (err) {
+	    setTimeout(function () {
+	      throw err;
+	    }, 0);
+	  });
+	};
+
+
+/***/ },
+/* 23 */
+/***/ function(module, exports, __webpack_require__) {
+
+	'use strict';
+
+	var Promise = __webpack_require__(20);
+
+	module.exports = Promise;
+	Promise.prototype['finally'] = function (f) {
+	  return this.then(function (value) {
+	    return Promise.resolve(f()).then(function () {
+	      return value;
+	    });
+	  }, function (err) {
+	    return Promise.resolve(f()).then(function () {
+	      throw err;
+	    });
+	  });
+	};
+
+
+/***/ },
+/* 24 */
+/***/ function(module, exports, __webpack_require__) {
+
+	'use strict';
+
+	//This file contains the ES6 extensions to the core Promises/A+ API
+
+	var Promise = __webpack_require__(20);
+
+	module.exports = Promise;
+
+	/* Static Functions */
+
+	var TRUE = valuePromise(true);
+	var FALSE = valuePromise(false);
+	var NULL = valuePromise(null);
+	var UNDEFINED = valuePromise(undefined);
+	var ZERO = valuePromise(0);
+	var EMPTYSTRING = valuePromise('');
+
+	function valuePromise(value) {
+	  var p = new Promise(Promise._61);
+	  p._81 = 1;
+	  p._65 = value;
+	  return p;
+	}
+	Promise.resolve = function (value) {
+	  if (value instanceof Promise) return value;
+
+	  if (value === null) return NULL;
+	  if (value === undefined) return UNDEFINED;
+	  if (value === true) return TRUE;
+	  if (value === false) return FALSE;
+	  if (value === 0) return ZERO;
+	  if (value === '') return EMPTYSTRING;
+
+	  if (typeof value === 'object' || typeof value === 'function') {
+	    try {
+	      var then = value.then;
+	      if (typeof then === 'function') {
+	        return new Promise(then.bind(value));
+	      }
+	    } catch (ex) {
+	      return new Promise(function (resolve, reject) {
+	        reject(ex);
+	      });
+	    }
+	  }
+	  return valuePromise(value);
+	};
+
+	Promise.all = function (arr) {
+	  var args = Array.prototype.slice.call(arr);
+
+	  return new Promise(function (resolve, reject) {
+	    if (args.length === 0) return resolve([]);
+	    var remaining = args.length;
+	    function res(i, val) {
+	      if (val && (typeof val === 'object' || typeof val === 'function')) {
+	        if (val instanceof Promise && val.then === Promise.prototype.then) {
+	          while (val._81 === 3) {
+	            val = val._65;
+	          }
+	          if (val._81 === 1) return res(i, val._65);
+	          if (val._81 === 2) reject(val._65);
+	          val.then(function (val) {
+	            res(i, val);
+	          }, reject);
+	          return;
+	        } else {
+	          var then = val.then;
+	          if (typeof then === 'function') {
+	            var p = new Promise(then.bind(val));
+	            p.then(function (val) {
+	              res(i, val);
+	            }, reject);
+	            return;
+	          }
+	        }
+	      }
+	      args[i] = val;
+	      if (--remaining === 0) {
+	        resolve(args);
+	      }
+	    }
+	    for (var i = 0; i < args.length; i++) {
+	      res(i, args[i]);
+	    }
+	  });
+	};
+
+	Promise.reject = function (value) {
+	  return new Promise(function (resolve, reject) {
+	    reject(value);
+	  });
+	};
+
+	Promise.race = function (values) {
+	  return new Promise(function (resolve, reject) {
+	    values.forEach(function(value){
+	      Promise.resolve(value).then(resolve, reject);
+	    });
+	  });
+	};
+
+	/* Prototype Methods */
+
+	Promise.prototype['catch'] = function (onRejected) {
+	  return this.then(null, onRejected);
+	};
+
+
+/***/ },
+/* 25 */
+/***/ function(module, exports, __webpack_require__) {
+
+	'use strict';
+
+	// This file contains then/promise specific extensions that are only useful
+	// for node.js interop
+
+	var Promise = __webpack_require__(20);
+	var asap = __webpack_require__(26);
+
+	module.exports = Promise;
+
+	/* Static Functions */
+
+	Promise.denodeify = function (fn, argumentCount) {
+	  if (
+	    typeof argumentCount === 'number' && argumentCount !== Infinity
+	  ) {
+	    return denodeifyWithCount(fn, argumentCount);
+	  } else {
+	    return denodeifyWithoutCount(fn);
+	  }
+	}
+
+	var callbackFn = (
+	  'function (err, res) {' +
+	  'if (err) { rj(err); } else { rs(res); }' +
+	  '}'
+	);
+	function denodeifyWithCount(fn, argumentCount) {
+	  var args = [];
+	  for (var i = 0; i < argumentCount; i++) {
+	    args.push('a' + i);
+	  }
+	  var body = [
+	    'return function (' + args.join(',') + ') {',
+	    'var self = this;',
+	    'return new Promise(function (rs, rj) {',
+	    'var res = fn.call(',
+	    ['self'].concat(args).concat([callbackFn]).join(','),
+	    ');',
+	    'if (res &&',
+	    '(typeof res === "object" || typeof res === "function") &&',
+	    'typeof res.then === "function"',
+	    ') {rs(res);}',
+	    '});',
+	    '};'
+	  ].join('');
+	  return Function(['Promise', 'fn'], body)(Promise, fn);
+	}
+	function denodeifyWithoutCount(fn) {
+	  var fnLength = Math.max(fn.length - 1, 3);
+	  var args = [];
+	  for (var i = 0; i < fnLength; i++) {
+	    args.push('a' + i);
+	  }
+	  var body = [
+	    'return function (' + args.join(',') + ') {',
+	    'var self = this;',
+	    'var args;',
+	    'var argLength = arguments.length;',
+	    'if (arguments.length > ' + fnLength + ') {',
+	    'args = new Array(arguments.length + 1);',
+	    'for (var i = 0; i < arguments.length; i++) {',
+	    'args[i] = arguments[i];',
+	    '}',
+	    '}',
+	    'return new Promise(function (rs, rj) {',
+	    'var cb = ' + callbackFn + ';',
+	    'var res;',
+	    'switch (argLength) {',
+	    args.concat(['extra']).map(function (_, index) {
+	      return (
+	        'case ' + (index) + ':' +
+	        'res = fn.call(' + ['self'].concat(args.slice(0, index)).concat('cb').join(',') + ');' +
+	        'break;'
+	      );
+	    }).join(''),
+	    'default:',
+	    'args[argLength] = cb;',
+	    'res = fn.apply(self, args);',
+	    '}',
+	    
+	    'if (res &&',
+	    '(typeof res === "object" || typeof res === "function") &&',
+	    'typeof res.then === "function"',
+	    ') {rs(res);}',
+	    '});',
+	    '};'
+	  ].join('');
+
+	  return Function(
+	    ['Promise', 'fn'],
+	    body
+	  )(Promise, fn);
+	}
+
+	Promise.nodeify = function (fn) {
+	  return function () {
+	    var args = Array.prototype.slice.call(arguments);
+	    var callback =
+	      typeof args[args.length - 1] === 'function' ? args.pop() : null;
+	    var ctx = this;
+	    try {
+	      return fn.apply(this, arguments).nodeify(callback, ctx);
+	    } catch (ex) {
+	      if (callback === null || typeof callback == 'undefined') {
+	        return new Promise(function (resolve, reject) {
+	          reject(ex);
+	        });
+	      } else {
+	        asap(function () {
+	          callback.call(ctx, ex);
+	        })
+	      }
+	    }
+	  }
+	}
+
+	Promise.prototype.nodeify = function (callback, ctx) {
+	  if (typeof callback != 'function') return this;
+
+	  this.then(function (value) {
+	    asap(function () {
+	      callback.call(ctx, null, value);
+	    });
+	  }, function (err) {
+	    asap(function () {
+	      callback.call(ctx, err);
+	    });
+	  });
+	}
+
+
+/***/ },
+/* 26 */
+/***/ function(module, exports, __webpack_require__) {
+
+	"use strict";
+
+	// rawAsap provides everything we need except exception management.
+	var rawAsap = __webpack_require__(21);
+	// RawTasks are recycled to reduce GC churn.
+	var freeTasks = [];
+	// We queue errors to ensure they are thrown in right order (FIFO).
+	// Array-as-queue is good enough here, since we are just dealing with exceptions.
+	var pendingErrors = [];
+	var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);
+
+	function throwFirstError() {
+	    if (pendingErrors.length) {
+	        throw pendingErrors.shift();
+	    }
+	}
+
+	/**
+	 * Calls a task as soon as possible after returning, in its own event, with priority
+	 * over other events like animation, reflow, and repaint. An error thrown from an
+	 * event will not interrupt, nor even substantially slow down the processing of
+	 * other events, but will be rather postponed to a lower priority event.
+	 * @param {{call}} task A callable object, typically a function that takes no
+	 * arguments.
+	 */
+	module.exports = asap;
+	function asap(task) {
+	    var rawTask;
+	    if (freeTasks.length) {
+	        rawTask = freeTasks.pop();
+	    } else {
+	        rawTask = new RawTask();
+	    }
+	    rawTask.task = task;
+	    rawAsap(rawTask);
+	}
+
+	// We wrap tasks with recyclable task objects.  A task object implements
+	// `call`, just like a function.
+	function RawTask() {
+	    this.task = null;
+	}
+
+	// The sole purpose of wrapping the task is to catch the exception and recycle
+	// the task object after its single use.
+	RawTask.prototype.call = function () {
+	    try {
+	        this.task.call();
+	    } catch (error) {
+	        if (asap.onerror) {
+	            // This hook exists purely for testing purposes.
+	            // Its name will be periodically randomized to break any code that
+	            // depends on its existence.
+	            asap.onerror(error);
+	        } else {
+	            // In a web browser, exceptions are not fatal. However, to avoid
+	            // slowing down the queue of pending tasks, we rethrow the error in a
+	            // lower priority turn.
+	            pendingErrors.push(error);
+	            requestErrorThrow();
+	        }
+	    } finally {
+	        this.task = null;
+	        freeTasks[freeTasks.length] = this;
+	    }
+	};
+
+
+/***/ },
+/* 27 */
+/***/ function(module, exports, __webpack_require__) {
+
+	'use strict';
+
+	var Promise = __webpack_require__(20);
+
+	module.exports = Promise;
+	Promise.enableSynchronous = function () {
+	  Promise.prototype.isPending = function() {
+	    return this.getState() == 0;
+	  };
+
+	  Promise.prototype.isFulfilled = function() {
+	    return this.getState() == 1;
+	  };
+
+	  Promise.prototype.isRejected = function() {
+	    return this.getState() == 2;
+	  };
+
+	  Promise.prototype.getValue = function () {
+	    if (this._81 === 3) {
+	      return this._65.getValue();
+	    }
+
+	    if (!this.isFulfilled()) {
+	      throw new Error('Cannot get a value of an unfulfilled promise.');
+	    }
+
+	    return this._65;
+	  };
+
+	  Promise.prototype.getReason = function () {
+	    if (this._81 === 3) {
+	      return this._65.getReason();
+	    }
+
+	    if (!this.isRejected()) {
+	      throw new Error('Cannot get a rejection reason of a non-rejected promise.');
+	    }
+
+	    return this._65;
+	  };
+
+	  Promise.prototype.getState = function () {
+	    if (this._81 === 3) {
+	      return this._65.getState();
+	    }
+	    if (this._81 === -1 || this._81 === -2) {
+	      return 0;
+	    }
+
+	    return this._81;
+	  };
+	};
+
+	Promise.disableSynchronous = function() {
+	  Promise.prototype.isPending = undefined;
+	  Promise.prototype.isFulfilled = undefined;
+	  Promise.prototype.isRejected = undefined;
+	  Promise.prototype.getValue = undefined;
+	  Promise.prototype.getReason = undefined;
+	  Promise.prototype.getState = undefined;
+	};
+
+
+/***/ },
+/* 28 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Cast = __webpack_require__(13);
+
+	function Scratch3EventBlocks(runtime) {
+	    /**
+	     * The runtime instantiating this block package.
+	     * @type {Runtime}
+	     */
+	    this.runtime = runtime;
+	}
+
+	/**
+	 * Retrieve the block primitives implemented by this package.
+	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 */
+	Scratch3EventBlocks.prototype.getPrimitives = function() {
+	    return {
+	        'event_broadcast': this.broadcast,
+	        'event_broadcastandwait': this.broadcastAndWait,
+	        'event_whengreaterthan': this.hatGreaterThanPredicate
+	    };
+	};
+
+	Scratch3EventBlocks.prototype.getHats = function () {
+	    return {
+	        'event_whenflagclicked': {
+	            restartExistingThreads: true
+	        },
+	        'event_whenkeypressed': {
+	            restartExistingThreads: false
+	        },
+	        'event_whenthisspriteclicked': {
+	            restartExistingThreads: true
+	        },
+	        'event_whenbackdropswitchesto': {
+	            restartExistingThreads: true
+	        },
+	        'event_whengreaterthan': {
+	            restartExistingThreads: false,
+	            edgeActivated: true
+	        },
+	        'event_whenbroadcastreceived': {
+	            restartExistingThreads: true
+	        }
+	    };
+	};
+
+	Scratch3EventBlocks.prototype.hatGreaterThanPredicate = function (args, util) {
+	    var option = Cast.toString(args.WHENGREATERTHANMENU).toLowerCase();
+	    var value = Cast.toNumber(args.VALUE);
+	    // @todo: Other cases :)
+	    if (option == 'timer') {
+	        return util.ioQuery('clock', 'projectTimer') > value;
+	    }
+	    return false;
+	};
+
+	Scratch3EventBlocks.prototype.broadcast = function(args, util) {
+	    var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
+	    util.startHats('event_whenbroadcastreceived', {
+	        'BROADCAST_OPTION': broadcastOption
+	    });
+	};
+
+	Scratch3EventBlocks.prototype.broadcastAndWait = function (args, util) {
+	    var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
+	    // Have we run before, starting threads?
+	    if (!util.stackFrame.startedThreads) {
+	        // No - start hats for this broadcast.
+	        util.stackFrame.startedThreads = util.startHats(
+	            'event_whenbroadcastreceived', {
+	                'BROADCAST_OPTION': broadcastOption
+	            }
+	        );
+	        if (util.stackFrame.startedThreads.length == 0) {
+	            // Nothing was started.
+	            return;
+	        }
+	    }
+	    // We've run before; check if the wait is still going on.
+	    var instance = this;
+	    var waiting = util.stackFrame.startedThreads.some(function(thread) {
+	        return instance.runtime.isActiveThread(thread);
+	    });
+	    if (waiting) {
+	        util.yieldFrame();
+	    }
+	};
+
+	module.exports = Scratch3EventBlocks;
+
+
+/***/ },
+/* 29 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Cast = __webpack_require__(13);
+
+	function Scratch3LooksBlocks(runtime) {
+	    /**
+	     * The runtime instantiating this block package.
+	     * @type {Runtime}
+	     */
+	    this.runtime = runtime;
+	}
+
+	/**
+	 * Retrieve the block primitives implemented by this package.
+	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 */
+	Scratch3LooksBlocks.prototype.getPrimitives = function() {
+	    return {
+	        'looks_say': this.say,
+	        'looks_sayforsecs': this.sayforsecs,
+	        'looks_think': this.think,
+	        'looks_thinkforsecs': this.sayforsecs,
+	        'looks_show': this.show,
+	        'looks_hide': this.hide,
+	        'looks_switchcostumeto': this.switchCostume,
+	        'looks_switchbackdropto': this.switchBackdrop,
+	        'looks_switchbackdroptoandwait': this.switchBackdropAndWait,
+	        'looks_nextcostume': this.nextCostume,
+	        'looks_nextbackdrop': this.nextBackdrop,
+	        'looks_changeeffectby': this.changeEffect,
+	        'looks_seteffectto': this.setEffect,
+	        'looks_cleargraphiceffects': this.clearEffects,
+	        'looks_changesizeby': this.changeSize,
+	        'looks_setsizeto': this.setSize,
+	        'looks_size': this.getSize,
+	        'looks_costumeorder': this.getCostumeIndex,
+	        'looks_backdroporder': this.getBackdropIndex,
+	        'looks_backdropname': this.getBackdropName
+	    };
+	};
+
+	Scratch3LooksBlocks.prototype.say = function (args, util) {
+	    util.target.setSay('say', args.MESSAGE);
+	};
+
+	Scratch3LooksBlocks.prototype.sayforsecs = function (args, util) {
+	    util.target.setSay('say', args.MESSAGE);
+	    return new Promise(function(resolve) {
+	        setTimeout(function() {
+	            // Clear say bubble and proceed.
+	            util.target.setSay();
+	            resolve();
+	        }, 1000 * args.SECS);
+	    });
+	};
+
+	Scratch3LooksBlocks.prototype.think = function (args, util) {
+	    util.target.setSay('think', args.MESSAGE);
+	};
+
+	Scratch3LooksBlocks.prototype.thinkforsecs = function (args, util) {
+	    util.target.setSay('think', args.MESSAGE);
+	    return new Promise(function(resolve) {
+	        setTimeout(function() {
+	            // Clear say bubble and proceed.
+	            util.target.setSay();
+	            resolve();
+	        }, 1000 * args.SECS);
+	    });
+	};
+
+	Scratch3LooksBlocks.prototype.show = function (args, util) {
+	    util.target.setVisible(true);
+	};
+
+	Scratch3LooksBlocks.prototype.hide = function (args, util) {
+	    util.target.setVisible(false);
+	};
+
+	/**
+	 * Utility function to set the costume or backdrop of a target.
+	 * Matches the behavior of Scratch 2.0 for different types of arguments.
+	 * @param {!Target} target Target to set costume/backdrop to.
+	 * @param {Any} requestedCostume Costume requested, e.g., 0, 'name', etc.
+	 * @param {boolean=} opt_zeroIndex Set to zero-index the requestedCostume.
+	 * @return {Array.<!Thread>} Any threads started by this switch.
+	 */
+	Scratch3LooksBlocks.prototype._setCostumeOrBackdrop = function (target,
+	        requestedCostume, opt_zeroIndex) {
+	    if (typeof requestedCostume === 'number') {
+	        target.setCostume(opt_zeroIndex ?
+	            requestedCostume : requestedCostume - 1);
+	    } else {
+	        var costumeIndex = target.getCostumeIndexByName(requestedCostume);
+	        if (costumeIndex > -1) {
+	            target.setCostume(costumeIndex);
+	        } else if (costumeIndex == 'previous costume' ||
+	                   costumeIndex == 'previous backdrop') {
+	            target.setCostume(target.currentCostume - 1);
+	        } else if (costumeIndex == 'next costume' ||
+	                   costumeIndex == 'next backdrop') {
+	            target.setCostume(target.currentCostume + 1);
+	        } else {
+	            var forcedNumber = Cast.toNumber(requestedCostume);
+	            if (!isNaN(forcedNumber)) {
+	                target.setCostume(opt_zeroIndex ?
+	                    forcedNumber : forcedNumber - 1);
+	            }
+	        }
+	    }
+	    if (target == this.runtime.getTargetForStage()) {
+	        // Target is the stage - start hats.
+	        var newName = target.sprite.costumes[target.currentCostume].name;
+	        return this.runtime.startHats('event_whenbackdropswitchesto', {
+	            'BACKDROP': newName
+	        });
+	    }
+	    return [];
+	};
+
+	Scratch3LooksBlocks.prototype.switchCostume = function (args, util) {
+	    this._setCostumeOrBackdrop(util.target, args.COSTUME);
+	};
+
+	Scratch3LooksBlocks.prototype.nextCostume = function (args, util) {
+	    this._setCostumeOrBackdrop(
+	        util.target, util.target.currentCostume + 1, true
+	    );
+	};
+
+	Scratch3LooksBlocks.prototype.switchBackdrop = function (args) {
+	    this._setCostumeOrBackdrop(this.runtime.getTargetForStage(), args.BACKDROP);
+	};
+
+	Scratch3LooksBlocks.prototype.switchBackdropAndWait = function (args, util) {
+	    // Have we run before, starting threads?
+	    if (!util.stackFrame.startedThreads) {
+	        // No - switch the backdrop.
+	        util.stackFrame.startedThreads = (
+	            this._setCostumeOrBackdrop(
+	                this.runtime.getTargetForStage(),
+	                args.BACKDROP
+	            )
+	        );
+	        if (util.stackFrame.startedThreads.length == 0) {
+	            // Nothing was started.
+	            return;
+	        }
+	    }
+	    // We've run before; check if the wait is still going on.
+	    var instance = this;
+	    var waiting = util.stackFrame.startedThreads.some(function(thread) {
+	        return instance.runtime.isActiveThread(thread);
+	    });
+	    if (waiting) {
+	        util.yieldFrame();
+	    }
+	};
+
+	Scratch3LooksBlocks.prototype.nextBackdrop = function () {
+	    var stage = this.runtime.getTargetForStage();
+	    this._setCostumeOrBackdrop(
+	        stage, stage.currentCostume + 1, true
+	    );
+	};
+
+	Scratch3LooksBlocks.prototype.changeEffect = function (args, util) {
+	    var effect = Cast.toString(args.EFFECT).toLowerCase();
+	    var change = Cast.toNumber(args.CHANGE);
+	    if (!util.target.effects.hasOwnProperty(effect)) return;
+	    var newValue = change + util.target.effects[effect];
+	    util.target.setEffect(effect, newValue);
+	};
+
+	Scratch3LooksBlocks.prototype.setEffect = function (args, util) {
+	    var effect = Cast.toString(args.EFFECT).toLowerCase();
+	    var value = Cast.toNumber(args.VALUE);
+	    util.target.setEffect(effect, value);
+	};
+
+	Scratch3LooksBlocks.prototype.clearEffects = function (args, util) {
+	    util.target.clearEffects();
+	};
+
+	Scratch3LooksBlocks.prototype.changeSize = function (args, util) {
+	    var change = Cast.toNumber(args.CHANGE);
+	    util.target.setSize(util.target.size + change);
+	};
+
+	Scratch3LooksBlocks.prototype.setSize = function (args, util) {
+	    var size = Cast.toNumber(args.SIZE);
+	    util.target.setSize(size);
+	};
+
+	Scratch3LooksBlocks.prototype.getSize = function (args, util) {
+	    return util.target.size;
+	};
+
+	Scratch3LooksBlocks.prototype.getBackdropIndex = function () {
+	    var stage = this.runtime.getTargetForStage();
+	    return stage.currentCostume + 1;
+	};
+
+	Scratch3LooksBlocks.prototype.getBackdropName = function () {
+	    var stage = this.runtime.getTargetForStage();
+	    return stage.sprite.costumes[stage.currentCostume].name;
+	};
+
+	Scratch3LooksBlocks.prototype.getCostumeIndex = function (args, util) {
+	    return util.target.currentCostume + 1;
+	};
+
+	module.exports = Scratch3LooksBlocks;
+
+
+/***/ },
+/* 30 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Cast = __webpack_require__(13);
+	var MathUtil = __webpack_require__(16);
+	var Timer = __webpack_require__(8);
+
+	function Scratch3MotionBlocks(runtime) {
+	    /**
+	     * The runtime instantiating this block package.
+	     * @type {Runtime}
+	     */
+	    this.runtime = runtime;
+	}
+
+	/**
+	 * Retrieve the block primitives implemented by this package.
+	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 */
+	Scratch3MotionBlocks.prototype.getPrimitives = function() {
+	    return {
+	        'motion_movesteps': this.moveSteps,
+	        'motion_gotoxy': this.goToXY,
+	        'motion_turnright': this.turnRight,
+	        'motion_turnleft': this.turnLeft,
+	        'motion_pointindirection': this.pointInDirection,
+	        'motion_glidesecstoxy': this.glide,
+	        'motion_changexby': this.changeX,
+	        'motion_setx': this.setX,
+	        'motion_changeyby': this.changeY,
+	        'motion_sety': this.setY,
+	        'motion_xposition': this.getX,
+	        'motion_yposition': this.getY,
+	        'motion_direction': this.getDirection
+	    };
+	};
+
+	Scratch3MotionBlocks.prototype.moveSteps = function (args, util) {
+	    var steps = Cast.toNumber(args.STEPS);
+	    var radians = MathUtil.degToRad(util.target.direction);
+	    var dx = steps * Math.cos(radians);
+	    var dy = steps * Math.sin(radians);
+	    util.target.setXY(util.target.x + dx, util.target.y + dy);
+	};
+
+	Scratch3MotionBlocks.prototype.goToXY = function (args, util) {
+	    var x = Cast.toNumber(args.X);
+	    var y = Cast.toNumber(args.Y);
+	    util.target.setXY(x, y);
+	};
+
+	Scratch3MotionBlocks.prototype.turnRight = function (args, util) {
+	    var degrees = Cast.toNumber(args.DEGREES);
+	    util.target.setDirection(util.target.direction + degrees);
+	};
+
+	Scratch3MotionBlocks.prototype.turnLeft = function (args, util) {
+	    var degrees = Cast.toNumber(args.DEGREES);
+	    util.target.setDirection(util.target.direction - degrees);
+	};
+
+	Scratch3MotionBlocks.prototype.pointInDirection = function (args, util) {
+	    var direction = Cast.toNumber(args.DIRECTION);
+	    util.target.setDirection(direction);
+	};
+
+	Scratch3MotionBlocks.prototype.glide = function (args, util) {
+	    if (!util.stackFrame.timer) {
+	        // First time: save data for future use.
+	        util.stackFrame.timer = new Timer();
+	        util.stackFrame.timer.start();
+	        util.stackFrame.duration = Cast.toNumber(args.SECS);
+	        util.stackFrame.startX = util.target.x;
+	        util.stackFrame.startY = util.target.y;
+	        util.stackFrame.endX = Cast.toNumber(args.X);
+	        util.stackFrame.endY = Cast.toNumber(args.Y);
+	        if (util.stackFrame.duration <= 0) {
+	            // Duration too short to glide.
+	            util.target.setXY(util.stackFrame.endX, util.stackFrame.endY);
+	            return;
+	        }
+	        util.yieldFrame();
+	    } else {
+	        var timeElapsed = util.stackFrame.timer.timeElapsed();
+	        if (timeElapsed < util.stackFrame.duration * 1000) {
+	            // In progress: move to intermediate position.
+	            var frac = timeElapsed / (util.stackFrame.duration * 1000);
+	            var dx = frac * (util.stackFrame.endX - util.stackFrame.startX);
+	            var dy = frac * (util.stackFrame.endY - util.stackFrame.startY);
+	            util.target.setXY(
+	                util.stackFrame.startX + dx,
+	                util.stackFrame.startY + dy
+	            );
+	            util.yieldFrame();
+	        } else {
+	            // Finished: move to final position.
+	            util.target.setXY(util.stackFrame.endX, util.stackFrame.endY);
+	        }
+	    }
+	};
+
+	Scratch3MotionBlocks.prototype.changeX = function (args, util) {
+	    var dx = Cast.toNumber(args.DX);
+	    util.target.setXY(util.target.x + dx, util.target.y);
+	};
+
+	Scratch3MotionBlocks.prototype.setX = function (args, util) {
+	    var x = Cast.toNumber(args.X);
+	    util.target.setXY(x, util.target.y);
+	};
+
+	Scratch3MotionBlocks.prototype.changeY = function (args, util) {
+	    var dy = Cast.toNumber(args.DY);
+	    util.target.setXY(util.target.x, util.target.y + dy);
+	};
+
+	Scratch3MotionBlocks.prototype.setY = function (args, util) {
+	    var y = Cast.toNumber(args.Y);
+	    util.target.setXY(util.target.x, y);
+	};
+
+	Scratch3MotionBlocks.prototype.getX = function (args, util) {
+	    return util.target.x;
+	};
+
+	Scratch3MotionBlocks.prototype.getY = function (args, util) {
+	    return util.target.y;
+	};
+
+	Scratch3MotionBlocks.prototype.getDirection = function (args, util) {
+	    return util.target.direction;
+	};
+
+	module.exports = Scratch3MotionBlocks;
+
+
+/***/ },
+/* 31 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Cast = __webpack_require__(13);
+
+	function Scratch3OperatorsBlocks(runtime) {
+	    /**
+	     * The runtime instantiating this block package.
+	     * @type {Runtime}
+	     */
+	    this.runtime = runtime;
+	}
+
+	/**
+	 * Retrieve the block primitives implemented by this package.
+	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 */
+	Scratch3OperatorsBlocks.prototype.getPrimitives = function() {
+	    return {
+	        'operator_add': this.add,
+	        'operator_subtract': this.subtract,
+	        'operator_multiply': this.multiply,
+	        'operator_divide': this.divide,
+	        'operator_lt': this.lt,
+	        'operator_equals': this.equals,
+	        'operator_gt': this.gt,
+	        'operator_and': this.and,
+	        'operator_or': this.or,
+	        'operator_not': this.not,
+	        'operator_random': this.random,
+	        'operator_join': this.join,
+	        'operator_letter_of': this.letterOf,
+	        'operator_length': this.length,
+	        'operator_mod': this.mod,
+	        'operator_round': this.round,
+	        'operator_mathop': this.mathop
+	    };
+	};
+
+	Scratch3OperatorsBlocks.prototype.add = function (args) {
+	    return Cast.toNumber(args.NUM1) + Cast.toNumber(args.NUM2);
+	};
+
+	Scratch3OperatorsBlocks.prototype.subtract = function (args) {
+	    return Cast.toNumber(args.NUM1) - Cast.toNumber(args.NUM2);
+	};
+
+	Scratch3OperatorsBlocks.prototype.multiply = function (args) {
+	    return Cast.toNumber(args.NUM1) * Cast.toNumber(args.NUM2);
+	};
+
+	Scratch3OperatorsBlocks.prototype.divide = function (args) {
+	    return Cast.toNumber(args.NUM1) / Cast.toNumber(args.NUM2);
+	};
+
+	Scratch3OperatorsBlocks.prototype.lt = function (args) {
+	    return Cast.compare(args.OPERAND1, args.OPERAND2) < 0;
+	};
+
+	Scratch3OperatorsBlocks.prototype.equals = function (args) {
+	    return Cast.compare(args.OPERAND1, args.OPERAND2) == 0;
+	};
+
+	Scratch3OperatorsBlocks.prototype.gt = function (args) {
+	    return Cast.compare(args.OPERAND1, args.OPERAND2) > 0;
+	};
+
+	Scratch3OperatorsBlocks.prototype.and = function (args) {
+	    return Cast.toBoolean(args.OPERAND1) && Cast.toBoolean(args.OPERAND2);
+	};
+
+	Scratch3OperatorsBlocks.prototype.or = function (args) {
+	    return Cast.toBoolean(args.OPERAND1) || Cast.toBoolean(args.OPERAND2);
+	};
+
+	Scratch3OperatorsBlocks.prototype.not = function (args) {
+	    return !Cast.toBoolean(args.OPERAND);
+	};
+
+	Scratch3OperatorsBlocks.prototype.random = function (args) {
+	    var nFrom = Cast.toNumber(args.FROM);
+	    var nTo = Cast.toNumber(args.TO);
+	    var low = nFrom <= nTo ? nFrom : nTo;
+	    var high = nFrom <= nTo ? nTo : nFrom;
+	    if (low == high) return low;
+	    // If both low and high are ints, truncate the result to an int.
+	    var lowInt = low == parseInt(low);
+	    var highInt = high == parseInt(high);
+	    if (lowInt && highInt) {
+	        return low + parseInt(Math.random() * ((high + 1) - low));
+	    }
+	    return (Math.random() * (high - low)) + low;
+	};
+
+	Scratch3OperatorsBlocks.prototype.join = function (args) {
+	    return Cast.toString(args.STRING1) + Cast.toString(args.STRING2);
+	};
+
+	Scratch3OperatorsBlocks.prototype.letterOf = function (args) {
+	    var index = Cast.toNumber(args.LETTER) - 1;
+	    var str = Cast.toString(args.STRING);
+	    // Out of bounds?
+	    if (index < 0 || index >= str.length) {
+	        return '';
+	    }
+	    return str.charAt(index);
+	};
+
+	Scratch3OperatorsBlocks.prototype.length = function (args) {
+	    return Cast.toString(args.STRING).length;
+	};
+
+	Scratch3OperatorsBlocks.prototype.mod = function (args) {
+	    var n = Cast.toNumber(args.NUM1);
+	    var modulus = Cast.toNumber(args.NUM2);
+	    var result = n % modulus;
+	    // Scratch mod is kept positive.
+	    if (result / modulus < 0) result += modulus;
+	    return result;
+	};
+
+	Scratch3OperatorsBlocks.prototype.round = function (args) {
+	    return Math.round(Cast.toNumber(args.NUM));
+	};
+
+	Scratch3OperatorsBlocks.prototype.mathop = function (args) {
+	    var operator = Cast.toString(args.OPERATOR).toLowerCase();
+	    var n = Cast.toNumber(args.NUM);
+	    switch (operator) {
+	    case 'abs': return Math.abs(n);
+	    case 'floor': return Math.floor(n);
+	    case 'ceiling': return Math.ceil(n);
+	    case 'sqrt': return Math.sqrt(n);
+	    case 'sin': return Math.sin((Math.PI * n) / 180);
+	    case 'cos': return Math.cos((Math.PI * n) / 180);
+	    case 'tan': return Math.tan((Math.PI * n) / 180);
+	    case 'asin': return (Math.asin(n) * 180) / Math.PI;
+	    case 'acos': return (Math.acos(n) * 180) / Math.PI;
+	    case 'atan': return (Math.atan(n) * 180) / Math.PI;
+	    case 'ln': return Math.log(n);
+	    case 'log': return Math.log(n) / Math.LN10;
+	    case 'e ^': return Math.exp(n);
+	    case '10 ^': return Math.pow(10, n);
+	    }
+	    return 0;
+	};
+
+	module.exports = Scratch3OperatorsBlocks;
+
+
+/***/ },
+/* 32 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var Cast = __webpack_require__(13);
+
+	function Scratch3SensingBlocks(runtime) {
+	    /**
+	     * The runtime instantiating this block package.
+	     * @type {Runtime}
+	     */
+	    this.runtime = runtime;
+	}
+
+	/**
+	 * Retrieve the block primitives implemented by this package.
+	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 */
+	Scratch3SensingBlocks.prototype.getPrimitives = function() {
+	    return {
+	        'sensing_touchingcolor': this.touchingColor,
+	        'sensing_coloristouchingcolor': this.colorTouchingColor,
+	        'sensing_timer': this.getTimer,
+	        'sensing_resettimer': this.resetTimer,
+	        'sensing_mousex': this.getMouseX,
+	        'sensing_mousey': this.getMouseY,
+	        'sensing_mousedown': this.getMouseDown,
+	        'sensing_keypressed': this.getKeyPressed,
+	        'sensing_current': this.current
+	    };
+	};
+
+	Scratch3SensingBlocks.prototype.touchingColor = function (args, util) {
+	    var color = Cast.toRgbColorList(args.COLOR);
+	    return util.target.isTouchingColor(color);
+	};
+
+	Scratch3SensingBlocks.prototype.colorTouchingColor = function (args, util) {
+	    var maskColor = Cast.toRgbColorList(args.COLOR);
+	    var targetColor = Cast.toRgbColorList(args.COLOR2);
+	    return util.target.colorIsTouchingColor(targetColor, maskColor);
+	};
+
+	Scratch3SensingBlocks.prototype.getTimer = function (args, util) {
+	    return util.ioQuery('clock', 'projectTimer');
+	};
+
+	Scratch3SensingBlocks.prototype.resetTimer = function (args, util) {
+	    util.ioQuery('clock', 'resetProjectTimer');
+	};
+
+	Scratch3SensingBlocks.prototype.getMouseX = function (args, util) {
+	    return util.ioQuery('mouse', 'getX');
+	};
+
+	Scratch3SensingBlocks.prototype.getMouseY = function (args, util) {
+	    return util.ioQuery('mouse', 'getY');
+	};
+
+	Scratch3SensingBlocks.prototype.getMouseDown = function (args, util) {
+	    return util.ioQuery('mouse', 'getIsDown');
+	};
+
+	Scratch3SensingBlocks.prototype.current = function (args) {
+	    var menuOption = Cast.toString(args.CURRENTMENU).toLowerCase();
+	    var date = new Date();
+	    switch (menuOption) {
+	    case 'year': return date.getFullYear();
+	    case 'month': return date.getMonth() + 1; // getMonth is zero-based
+	    case 'date': return date.getDate();
+	    case 'dayofweek': return date.getDay() + 1; // getDay is zero-based, Sun=0
+	    case 'hour': return date.getHours();
+	    case 'minute': return date.getMinutes();
+	    case 'second': return date.getSeconds();
+	    }
+	    return 0;
+	};
+
+	Scratch3SensingBlocks.prototype.getKeyPressed = function (args, util) {
+	    return util.ioQuery('keyboard', 'getKeyIsDown', args.KEY_OPTION);
+	};
+
+	module.exports = Scratch3SensingBlocks;
+
+
+/***/ },
+/* 33 */
+/***/ function(module, exports, __webpack_require__) {
+
+	/**
+	 * @fileoverview
+	 * Partial implementation of an SB2 JSON importer.
+	 * Parses provided JSON and then generates all needed
+	 * scratch-vm runtime structures.
+	 */
+
+	var Blocks = __webpack_require__(34);
+	var Sprite = __webpack_require__(85);
+	var Color = __webpack_require__(14);
+	var uid = __webpack_require__(88);
+	var specMap = __webpack_require__(89);
+
+	/**
+	 * Top-level handler. Parse provided JSON,
+	 * and process the top-level object (the stage object).
+	 * @param {!string} json SB2-format JSON to load.
+	 * @param {!Runtime} runtime Runtime object to load all structures into.
+	 */
+	function sb2import (json, runtime) {
+	    parseScratchObject(
+	        JSON.parse(json),
+	        runtime,
+	        true
+	    );
+	}
+
+	/**
+	 * Parse a single "Scratch object" and create all its in-memory VM objects.
+	 * @param {!Object} object From-JSON "Scratch object:" sprite, stage, watcher.
+	 * @param {!Runtime} runtime Runtime object to load all structures into.
+	 * @param {boolean} topLevel Whether this is the top-level object (stage).
+	 */
+	function parseScratchObject (object, runtime, topLevel) {
+	    if (!object.hasOwnProperty('objName')) {
+	        // Watcher/monitor - skip this object until those are implemented in VM.
+	        // @todo
+	        return;
+	    }
+	    // Blocks container for this object.
+	    var blocks = new Blocks();
+	    // @todo: For now, load all Scratch objects (stage/sprites) as a Sprite.
+	    var sprite = new Sprite(blocks);
+	    // Sprite/stage name from JSON.
+	    if (object.hasOwnProperty('objName')) {
+	        sprite.name = object.objName;
+	    }
+	    // Costumes from JSON.
+	    if (object.hasOwnProperty('costumes')) {
+	        for (var i = 0; i < object.costumes.length; i++) {
+	            var costume = object.costumes[i];
+	            // @todo: Make sure all the relevant metadata is being pulled out.
+	            sprite.costumes.push({
+	                skin: 'https://cdn.assets.scratch.mit.edu/internalapi/asset/' 
+	                    + costume.baseLayerMD5 + '/get/',
+	                name: costume.costumeName,
+	                bitmapResolution: costume.bitmapResolution,
+	                rotationCenterX: costume.rotationCenterX,
+	                rotationCenterY: costume.rotationCenterY
+	            });
+	        }
+	    }
+	    // If included, parse any and all scripts/blocks on the object.
+	    if (object.hasOwnProperty('scripts')) {
+	        parseScripts(object.scripts, blocks);
+	    }
+	    // Create the first clone, and load its run-state from JSON.
+	    var target = sprite.createClone();
+	    // Add it to the runtime's list of targets.
+	    runtime.targets.push(target);
+	    if (object.scratchX) {
+	        target.x = object.scratchX;
+	    }
+	    if (object.scratchY) {
+	        target.y = object.scratchY;
+	    }
+	    if (object.direction) {
+	        target.direction = object.direction;
+	    }
+	    if (object.scale) {
+	        // SB2 stores as 1.0 = 100%; we use % in the VM.
+	        target.size = object.scale * 100;
+	    }
+	    if (object.visible) {
+	        target.visible = object.visible;
+	    }
+	    if (object.currentCostumeIndex) {
+	        target.currentCostume = object.currentCostumeIndex;
+	    }
+	    target.isStage = topLevel;
+	    // The stage will have child objects; recursively process them.
+	    if (object.children) {
+	        for (var j = 0; j < object.children.length; j++) {
+	            parseScratchObject(object.children[j], runtime, false);
+	        }
+	    }
+	}
+
+	/**
+	 * Parse a Scratch object's scripts into VM blocks.
+	 * This should only handle top-level scripts that include X, Y coordinates.
+	 * @param {!Object} scripts Scripts object from SB2 JSON.
+	 * @param {!Blocks} blocks Blocks object to load parsed blocks into.
+	 */
+	function parseScripts (scripts, blocks) {
+	    for (var i = 0; i < scripts.length; i++) {
+	        var script = scripts[i];
+	        var scriptX = script[0];
+	        var scriptY = script[1];
+	        var blockList = script[2];
+	        var parsedBlockList = parseBlockList(blockList);
+	        if (parsedBlockList[0]) {
+	            // Adjust script coordinates to account for
+	            // larger block size in scratch-blocks.
+	            // @todo: Determine more precisely the right formulas here.
+	            parsedBlockList[0].x = scriptX * 1.1;
+	            parsedBlockList[0].y = scriptY * 1.1;
+	            parsedBlockList[0].topLevel = true;
+	            parsedBlockList[0].parent = null;
+	        }
+	        // Flatten children and create add the blocks.
+	        var convertedBlocks = flatten(parsedBlockList);
+	        for (var j = 0; j < convertedBlocks.length; j++) {
+	            blocks.createBlock(convertedBlocks[j]);
+	        }
+	    }
+	}
+
+	/**
+	 * Parse any list of blocks from SB2 JSON into a list of VM-format blocks.
+	 * Could be used to parse a top-level script,
+	 * a list of blocks in a branch (e.g., in forever),
+	 * or a list of blocks in an argument (e.g., move [pick random...]).
+	 * @param {Array.<Object>} blockList SB2 JSON-format block list.
+	 * @return {Array.<Object>} Scratch VM-format block list.
+	 */
+	function parseBlockList (blockList) {
+	    var resultingList = [];
+	    var previousBlock = null; // For setting next.
+	    for (var i = 0; i < blockList.length; i++) {
+	        var block = blockList[i];
+	        var parsedBlock = parseBlock(block);
+	        if (previousBlock) {
+	            parsedBlock.parent = previousBlock.id;
+	            previousBlock.next = parsedBlock.id;
+	        }
+	        previousBlock = parsedBlock;
+	        resultingList.push(parsedBlock);
+	    }
+	    return resultingList;
+	}
+
+	/**
+	 * Flatten a block tree into a block list.
+	 * Children are temporarily stored on the `block.children` property.
+	 * @param {Array.<Object>} blocks list generated by `parseBlockList`.
+	 * @return {Array.<Object>} Flattened list to be passed to `blocks.createBlock`.
+	 */
+	function flatten (blocks) {
+	    var finalBlocks = [];
+	    for (var i = 0; i < blocks.length; i++) {
+	        var block = blocks[i];
+	        finalBlocks.push(block);
+	        if (block.children) {
+	            finalBlocks = finalBlocks.concat(flatten(block.children));
+	        }
+	        delete block.children;
+	    }
+	    return finalBlocks;
+	}
+
+	/**
+	 * Parse a single SB2 JSON-formatted block and its children.
+	 * @param {!Object} sb2block SB2 JSON-formatted block.
+	 * @return {Object} Scratch VM format block.
+	 */
+	function parseBlock (sb2block) {
+	    // First item in block object is the old opcode (e.g., 'forward:').
+	    var oldOpcode = sb2block[0];
+	    // Convert the block using the specMap. See sb2specmap.js.
+	    if (!oldOpcode || !specMap[oldOpcode]) {
+	        console.warn('Couldn\'t find SB2 block: ', oldOpcode);
+	        return;
+	    }
+	    var blockMetadata = specMap[oldOpcode];
+	    // Block skeleton.
+	    var activeBlock = {
+	        id: uid(), // Generate a new block unique ID.
+	        opcode: blockMetadata.opcode, // Converted, e.g. "motion_movesteps".
+	        inputs: {}, // Inputs to this block and the blocks they point to.
+	        fields: {}, // Fields on this block and their values.
+	        next: null, // Next block.
+	        shadow: false, // No shadow blocks in an SB2 by default.
+	        children: [] // Store any generated children, flattened in `flatten`.
+	    };
+	    // Look at the expected arguments in `blockMetadata.argMap.`
+	    // The basic problem here is to turn positional SB2 arguments into
+	    // non-positional named Scratch VM arguments.
+	    for (var i = 0; i < blockMetadata.argMap.length; i++) {
+	        var expectedArg = blockMetadata.argMap[i];
+	        var providedArg = sb2block[i + 1]; // (i = 0 is opcode)
+	        // Whether the input is obscuring a shadow.
+	        var shadowObscured = false;
+	        // Positional argument is an input.
+	        if (expectedArg.type == 'input') {
+	            // Create a new block and input metadata.
+	            var inputUid = uid();
+	            activeBlock.inputs[expectedArg.inputName] = {
+	                name: expectedArg.inputName,
+	                block: null,
+	                shadow: null
+	            };
+	            if (typeof providedArg == 'object' && providedArg) {
+	                // Block or block list occupies the input.
+	                var innerBlocks;
+	                if (typeof providedArg[0] == 'object' && providedArg[0]) {
+	                    // Block list occupies the input.
+	                    innerBlocks = parseBlockList(providedArg);
+	                } else {
+	                    // Single block occupies the input.
+	                    innerBlocks = [parseBlock(providedArg)];
+	                }
+	                for (var j = 0; j < innerBlocks.length; j++) {
+	                    innerBlocks[j].parent = activeBlock.id;
+	                }
+	                // Obscures any shadow.
+	                shadowObscured = true;
+	                activeBlock.inputs[expectedArg.inputName].block = (
+	                    innerBlocks[0].id
+	                );
+	                activeBlock.children = (
+	                    activeBlock.children.concat(innerBlocks)
+	                );
+	            }
+	            // Generate a shadow block to occupy the input.
+	            if (!expectedArg.inputOp) {
+	                // No editable shadow input; e.g., for a boolean.
+	                continue;
+	            }
+	            // Each shadow has a field generated for it automatically.
+	            // Value to be filled in the field.
+	            var fieldValue = providedArg;
+	            // Shadows' field names match the input name, except for these:
+	            var fieldName = expectedArg.inputName;
+	            if (expectedArg.inputOp == 'math_number' ||
+	                expectedArg.inputOp == 'math_whole_number' ||
+	                expectedArg.inputOp == 'math_positive_number' ||
+	                expectedArg.inputOp == 'math_integer' ||
+	                expectedArg.inputOp == 'math_angle') {
+	                fieldName = 'NUM';
+	                // Fields are given Scratch 2.0 default values if obscured.
+	                if (shadowObscured) {
+	                    fieldValue = 10;
+	                }
+	            } else if (expectedArg.inputOp == 'text') {
+	                fieldName = 'TEXT';
+	                if (shadowObscured) {
+	                    fieldValue = '';
+	                }
+	            } else if (expectedArg.inputOp == 'colour_picker') {
+	                // Convert SB2 color to hex.
+	                fieldValue = Color.decimalToHex(providedArg);
+	                fieldName = 'COLOUR';
+	                if (shadowObscured) {
+	                    fieldValue = '#990000';
+	                }
+	            }
+	            var fields = {};
+	            fields[fieldName] = {
+	                name: fieldName,
+	                value: fieldValue
+	            };
+	            activeBlock.children.push({
+	                id: inputUid,
+	                opcode: expectedArg.inputOp,
+	                inputs: {},
+	                fields: fields,
+	                next: null,
+	                topLevel: false,
+	                parent: activeBlock.id,
+	                shadow: true
+	            });
+	            activeBlock.inputs[expectedArg.inputName].shadow = inputUid;
+	            // If no block occupying the input, alias to the shadow.
+	            if (!activeBlock.inputs[expectedArg.inputName].block) {
+	                activeBlock.inputs[expectedArg.inputName].block = inputUid;
+	            }
+	        } else if (expectedArg.type == 'field') {
+	            // Add as a field on this block.
+	            activeBlock.fields[expectedArg.fieldName] = {
+	                name: expectedArg.fieldName,
+	                value: providedArg
+	            };
+	        }
+	    }
+	    return activeBlock;
+	}
+
+	module.exports = sb2import;
+
+
+/***/ },
+/* 34 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var adapter = __webpack_require__(35);
 
 	/**
 	 * @fileoverview
@@ -1699,68 +5075,80 @@
 	    return inputs;
 	};
 
+	/**
+	 * Get the top-level script for a given block.
+	 * @param {?string} id ID of block to query.
+	 * @return {?string} ID of top-level script block.
+	 */
+	Blocks.prototype.getTopLevelScript = function (id) {
+	    if (typeof this._blocks[id] === 'undefined') return null;
+	    var block = this._blocks[id];
+	    while (block.parent !== null) {
+	        block = this._blocks[block.parent];
+	    }
+	    return block.id;
+	};
+
 	// ---------------------------------------------------------------------
 
 	/**
 	 * Create event listener for blocks. Handles validation and serves as a generic
 	 * adapter between the blocks and the runtime interface.
+	 * @param {Object} e Blockly "block" event
 	 * @param {boolean} isFlyout If true, create a listener for flyout events.
 	 * @param {?Runtime} opt_runtime Optional runtime to forward click events to.
-	 * @return {Function} A generated listener to attach to Blockly instance.
 	 */
 
-	Blocks.prototype.generateBlockListener = function (isFlyout, opt_runtime) {
-	    var instance = this;
-	    /**
-	     * The actual generated block listener.
-	     * @param {Object} e Blockly "block" event
-	     */
-	    return function (e) {
-	        // Validate event
-	        if (typeof e !== 'object') return;
-	        if (typeof e.blockId !== 'string') return;
+	Blocks.prototype.blocklyListen = function (e, isFlyout, opt_runtime) {
+	    // Validate event
+	    if (typeof e !== 'object') return;
+	    if (typeof e.blockId !== 'string') return;
 
-	        // UI event: clicked scripts toggle in the runtime.
-	        if (e.element === 'stackclick') {
-	            if (opt_runtime) {
-	                opt_runtime.toggleScript(e.blockId);
-	            }
+	    // UI event: clicked scripts toggle in the runtime.
+	    if (e.element === 'stackclick') {
+	        if (opt_runtime) {
+	            opt_runtime.toggleScript(e.blockId);
+	        }
+	        return;
+	    }
+
+	    // Block create/update/destroy
+	    switch (e.type) {
+	    case 'create':
+	        var newBlocks = adapter(e);
+	        // A create event can create many blocks. Add them all.
+	        for (var i = 0; i < newBlocks.length; i++) {
+	            this.createBlock(newBlocks[i], isFlyout);
+	        }
+	        break;
+	    case 'change':
+	        this.changeBlock({
+	            id: e.blockId,
+	            element: e.element,
+	            name: e.name,
+	            value: e.newValue
+	        });
+	        break;
+	    case 'move':
+	        this.moveBlock({
+	            id: e.blockId,
+	            oldParent: e.oldParentId,
+	            oldInput: e.oldInputName,
+	            newParent: e.newParentId,
+	            newInput: e.newInputName,
+	            newCoordinate: e.newCoordinate
+	        });
+	        break;
+	    case 'delete':
+	        // Don't accept delete events for shadow blocks being obscured.
+	        if (this._blocks[e.blockId].shadow) {
 	            return;
 	        }
-
-	        // Block create/update/destroy
-	        switch (e.type) {
-	        case 'create':
-	            var newBlocks = adapter(e);
-	            // A create event can create many blocks. Add them all.
-	            for (var i = 0; i < newBlocks.length; i++) {
-	                instance.createBlock(newBlocks[i], isFlyout);
-	            }
-	            break;
-	        case 'change':
-	            instance.changeBlock({
-	                id: e.blockId,
-	                element: e.element,
-	                name: e.name,
-	                value: e.newValue
-	            });
-	            break;
-	        case 'move':
-	            instance.moveBlock({
-	                id: e.blockId,
-	                oldParent: e.oldParentId,
-	                oldInput: e.oldInputName,
-	                newParent: e.newParentId,
-	                newInput: e.newInputName
-	            });
-	            break;
-	        case 'delete':
-	            instance.deleteBlock({
-	                id: e.blockId
-	            });
-	            break;
-	        }
-	    };
+	        this.deleteBlock({
+	            id: e.blockId
+	        });
+	        break;
+	    }
 	};
 
 	// ---------------------------------------------------------------------
@@ -1771,9 +5159,13 @@
 	 * @param {boolean} opt_isFlyoutBlock Whether the block is in the flyout.
 	 */
 	Blocks.prototype.createBlock = function (block, opt_isFlyoutBlock) {
-	    // Create new block
+	    // Does the block already exist?
+	    // Could happen, e.g., for an unobscured shadow.
+	    if (this._blocks.hasOwnProperty(block.id)) {
+	        return;
+	    }
+	    // Create new block.
 	    this._blocks[block.id] = block;
-
 	    // Push block id to scripts array.
 	    // Blocks are added as a top-level stack if they are marked as a top-block
 	    // (if they were top-level XML in the event) and if they are not
@@ -1802,6 +5194,12 @@
 	 * @param {!Object} e Blockly move event to be processed
 	 */
 	Blocks.prototype.moveBlock = function (e) {
+	    // Move coordinate changes.
+	    if (e.newCoordinate) {
+	        this._blocks[e.id].x = e.newCoordinate.x;
+	        this._blocks[e.id].y = e.newCoordinate.y;
+	    }
+
 	    // Remove from any old parent.
 	    if (e.oldParent !== undefined) {
 	        var oldParent = this._blocks[e.oldParent];
@@ -1813,6 +5211,7 @@
 	            // This block was connected to the old parent's next connection.
 	            oldParent.next = null;
 	        }
+	        this._blocks[e.id].parent = null;
 	    }
 
 	    // Has the block become a top-level block?
@@ -1823,15 +5222,22 @@
 	        this._deleteScript(e.id);
 	        // Otherwise, try to connect it in its new place.
 	        if (e.newInput !== undefined) {
-	             // Moved to the new parent's input.
+	            // Moved to the new parent's input.
+	            // Don't obscure the shadow block.
+	            var oldShadow = null;
+	            if (this._blocks[e.newParent].inputs.hasOwnProperty(e.newInput)) {
+	                oldShadow = this._blocks[e.newParent].inputs[e.newInput].shadow;
+	            }
 	            this._blocks[e.newParent].inputs[e.newInput] = {
 	                name: e.newInput,
-	                block: e.id
+	                block: e.id,
+	                shadow: oldShadow
 	            };
 	        } else {
 	            // Moved to the new parent's next connection.
 	            this._blocks[e.newParent].next = e.id;
 	        }
+	        this._blocks[e.id].parent = e.newParent;
 	    }
 	};
 
@@ -1856,6 +5262,11 @@
 	        if (block.inputs[input].block !== null) {
 	            this.deleteBlock({id: block.inputs[input].block});
 	        }
+	        // Delete obscured shadow blocks.
+	        if (block.inputs[input].shadow !== null &&
+	            block.inputs[input].shadow !== block.inputs[input].block) {
+	            this.deleteBlock({id: block.inputs[input].shadow});
+	        }
 	    }
 
 	    // Delete any script starting with this block.
@@ -1867,6 +5278,70 @@
 
 	// ---------------------------------------------------------------------
 
+	/**
+	 * Encode all of `this._blocks` as an XML string usable
+	 * by a Blockly/scratch-blocks workspace.
+	 * @return {string} String of XML representing this object's blocks.
+	 */
+	Blocks.prototype.toXML = function () {
+	    var xmlString = '<xml xmlns="http://www.w3.org/1999/xhtml">';
+	    for (var i = 0; i < this._scripts.length; i++) {
+	        xmlString += this.blockToXML(this._scripts[i]);
+	    }
+	    return xmlString + '</xml>';
+	};
+
+	/**
+	 * Recursively encode an individual block and its children
+	 * into a Blockly/scratch-blocks XML string.
+	 * @param {!string} blockId ID of block to encode.
+	 * @return {string} String of XML representing this block and any children.
+	 */
+	Blocks.prototype.blockToXML = function (blockId) {
+	    var block = this._blocks[blockId];
+	    // Encode properties of this block.
+	    var tagName = (block.shadow) ? 'shadow' : 'block';
+	    var xy = (block.topLevel) ?
+	        ' x="' + block.x +'"' + ' y="' + block.y +'"' :
+	        '';
+	    var xmlString = '';
+	    xmlString += '<' + tagName +
+	        ' id="' + block.id + '"' +
+	        ' type="' + block.opcode + '"' +
+	        xy +
+	        '>';
+	    // Add any inputs on this block.
+	    for (var input in block.inputs) {
+	        var blockInput = block.inputs[input];
+	        // Only encode a value tag if the value input is occupied.
+	        if (blockInput.block || blockInput.shadow) {
+	            xmlString += '<value name="' + blockInput.name + '">';
+	            if (blockInput.block) {
+	                xmlString += this.blockToXML(blockInput.block);
+	            }
+	            if (blockInput.shadow && blockInput.shadow != blockInput.block) {
+	                // Obscured shadow.
+	                xmlString += this.blockToXML(blockInput.shadow);
+	            }
+	            xmlString += '</value>';
+	        }
+	    }
+	    // Add any fields on this block.
+	    for (var field in block.fields) {
+	        var blockField = block.fields[field];
+	        xmlString += '<field name="' + blockField.name + '">' +
+	            blockField.value + '</field>';
+	    }
+	    // Add blocks connected to the next connection.
+	    if (block.next) {
+	        xmlString += '<next>' + this.blockToXML(block.next) + '</next>';
+	    }
+	    xmlString += '</' + tagName + '>';
+	    return xmlString;
+	};
+
+	// ---------------------------------------------------------------------
+
 	/**
 	 * Helper to add a stack to `this._scripts`.
 	 * @param {?string} topBlockId ID of block that starts the script.
@@ -1894,10 +5369,10 @@
 
 
 /***/ },
-/* 11 */
+/* 35 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var html = __webpack_require__(12);
+	var html = __webpack_require__(36);
 
 	/**
 	 * Adapter between block creation events and block representation which can be
@@ -1930,7 +5405,7 @@
 	        }
 	        var tagName = block.name.toLowerCase();
 	        if (tagName == 'block' || tagName == 'shadow') {
-	            domToBlock(block, blocks, true);
+	            domToBlock(block, blocks, true, null);
 	        }
 	    }
 	    // Flatten blocks object into a list.
@@ -1947,8 +5422,9 @@
 	 * @param {Element} blockDOM DOM tree for an individual block.
 	 * @param {Object} blocks Collection of blocks to add to.
 	 * @param {Boolean} isTopBlock Whether blocks at this level are "top blocks."
+	 * @param {?string} parent Parent block ID.
 	 */
-	function domToBlock (blockDOM, blocks, isTopBlock) {
+	function domToBlock (blockDOM, blocks, isTopBlock, parent) {
 	    // Block skeleton.
 	    var block = {
 	        id: blockDOM.attribs.id, // Block ID
@@ -1956,7 +5432,11 @@
 	        inputs: {}, // Inputs to this block and the blocks they point to.
 	        fields: {}, // Fields on this block and their values.
 	        next: null, // Next block in the stack, if one exists.
-	        topLevel: isTopBlock // If this block starts a stack.
+	        topLevel: isTopBlock, // If this block starts a stack.
+	        parent: parent, // Parent block ID, if available.
+	        shadow: blockDOM.name == 'shadow', // If this represents a shadow/slot.
+	        x: blockDOM.attribs.x, // X position of script, if top-level.
+	        y: blockDOM.attribs.y // Y position of script, if top-level.
 	    };
 
 	    // Add the block to the representation tree.
@@ -2009,12 +5489,17 @@
 	        case 'value':
 	        case 'statement':
 	            // Recursively generate block structure for input block.
-	            domToBlock(childBlockNode, blocks, false);
+	            domToBlock(childBlockNode, blocks, false, block.id);
+	            if (childShadowNode && childBlockNode != childShadowNode) {
+	                // Also generate the shadow block.
+	                domToBlock(childShadowNode, blocks, false, block.id);
+	            }
 	            // Link this block's input to the child block.
 	            var inputName = xmlChild.attribs.name;
 	            block.inputs[inputName] = {
 	                name: inputName,
-	                block: childBlockNode.attribs.id
+	                block: childBlockNode.attribs.id,
+	                shadow: childShadowNode ? childShadowNode.attribs.id : null
 	            };
 	            break;
 	        case 'next':
@@ -2023,7 +5508,7 @@
 	                continue;
 	            }
 	            // Recursively generate block structure for next block.
-	            domToBlock(childBlockNode, blocks, false);
+	            domToBlock(childBlockNode, blocks, false, block.id);
 	            // Link next block to this block.
 	            block.next = childBlockNode.attribs.id;
 	            break;
@@ -2033,11 +5518,11 @@
 
 
 /***/ },
-/* 12 */
+/* 36 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var Parser = __webpack_require__(13),
-	    DomHandler = __webpack_require__(20);
+	var Parser = __webpack_require__(37),
+	    DomHandler = __webpack_require__(44);
 
 	function defineProp(name, value){
 		delete module.exports[name];
@@ -2047,26 +5532,26 @@
 
 	module.exports = {
 		Parser: Parser,
-		Tokenizer: __webpack_require__(14),
-		ElementType: __webpack_require__(21),
+		Tokenizer: __webpack_require__(38),
+		ElementType: __webpack_require__(45),
 		DomHandler: DomHandler,
 		get FeedHandler(){
-			return defineProp("FeedHandler", __webpack_require__(24));
+			return defineProp("FeedHandler", __webpack_require__(48));
 		},
 		get Stream(){
-			return defineProp("Stream", __webpack_require__(25));
+			return defineProp("Stream", __webpack_require__(49));
 		},
 		get WritableStream(){
-			return defineProp("WritableStream", __webpack_require__(26));
+			return defineProp("WritableStream", __webpack_require__(50));
 		},
 		get ProxyHandler(){
-			return defineProp("ProxyHandler", __webpack_require__(47));
+			return defineProp("ProxyHandler", __webpack_require__(71));
 		},
 		get DomUtils(){
-			return defineProp("DomUtils", __webpack_require__(48));
+			return defineProp("DomUtils", __webpack_require__(72));
 		},
 		get CollectingHandler(){
-			return defineProp("CollectingHandler", __webpack_require__(60));
+			return defineProp("CollectingHandler", __webpack_require__(84));
 		},
 		// For legacy support
 		DefaultHandler: DomHandler,
@@ -2107,10 +5592,10 @@
 
 
 /***/ },
-/* 13 */
+/* 37 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var Tokenizer = __webpack_require__(14);
+	var Tokenizer = __webpack_require__(38);
 
 	/*
 		Options:
@@ -2465,15 +5950,15 @@
 
 
 /***/ },
-/* 14 */
+/* 38 */
 /***/ function(module, exports, __webpack_require__) {
 
 	module.exports = Tokenizer;
 
-	var decodeCodePoint = __webpack_require__(15),
-	    entityMap = __webpack_require__(17),
-	    legacyMap = __webpack_require__(18),
-	    xmlMap    = __webpack_require__(19),
+	var decodeCodePoint = __webpack_require__(39),
+	    entityMap = __webpack_require__(41),
+	    legacyMap = __webpack_require__(42),
+	    xmlMap    = __webpack_require__(43),
 
 	    i = 0,
 
@@ -3377,10 +6862,10 @@
 
 
 /***/ },
-/* 15 */
+/* 39 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var decodeMap = __webpack_require__(16);
+	var decodeMap = __webpack_require__(40);
 
 	module.exports = decodeCodePoint;
 
@@ -3409,7 +6894,7 @@
 
 
 /***/ },
-/* 16 */
+/* 40 */
 /***/ function(module, exports) {
 
 	module.exports = {
@@ -3444,7 +6929,7 @@
 	};
 
 /***/ },
-/* 17 */
+/* 41 */
 /***/ function(module, exports) {
 
 	module.exports = {
@@ -5576,7 +9061,7 @@
 	};
 
 /***/ },
-/* 18 */
+/* 42 */
 /***/ function(module, exports) {
 
 	module.exports = {
@@ -5689,7 +9174,7 @@
 	};
 
 /***/ },
-/* 19 */
+/* 43 */
 /***/ function(module, exports) {
 
 	module.exports = {
@@ -5701,14 +9186,14 @@
 	};
 
 /***/ },
-/* 20 */
+/* 44 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var ElementType = __webpack_require__(21);
+	var ElementType = __webpack_require__(45);
 
 	var re_whitespace = /\s+/g;
-	var NodePrototype = __webpack_require__(22);
-	var ElementPrototype = __webpack_require__(23);
+	var NodePrototype = __webpack_require__(46);
+	var ElementPrototype = __webpack_require__(47);
 
 	function DomHandler(callback, options, elementCB){
 		if(typeof callback === "object"){
@@ -5889,7 +9374,7 @@
 
 
 /***/ },
-/* 21 */
+/* 45 */
 /***/ function(module, exports) {
 
 	//Types of elements found in the DOM
@@ -5910,7 +9395,7 @@
 
 
 /***/ },
-/* 22 */
+/* 46 */
 /***/ function(module, exports) {
 
 	// This object will be used as the prototype for Nodes when creating a
@@ -5960,11 +9445,11 @@
 
 
 /***/ },
-/* 23 */
+/* 47 */
 /***/ function(module, exports, __webpack_require__) {
 
 	// DOM-Level-1-compliant structure
-	var NodePrototype = __webpack_require__(22);
+	var NodePrototype = __webpack_require__(46);
 	var ElementPrototype = module.exports = Object.create(NodePrototype);
 
 	var domLvl1 = {
@@ -5986,10 +9471,10 @@
 
 
 /***/ },
-/* 24 */
+/* 48 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var index = __webpack_require__(12),
+	var index = __webpack_require__(36),
 	    DomHandler = index.DomHandler,
 		DomUtils = index.DomUtils;
 
@@ -6087,12 +9572,12 @@
 
 
 /***/ },
-/* 25 */
+/* 49 */
 /***/ function(module, exports, __webpack_require__) {
 
 	module.exports = Stream;
 
-	var Parser = __webpack_require__(26);
+	var Parser = __webpack_require__(50);
 
 	function Stream(options){
 		Parser.call(this, new Cbs(this), options);
@@ -6106,7 +9591,7 @@
 		this.scope = scope;
 	}
 
-	var EVENTS = __webpack_require__(12).EVENTS;
+	var EVENTS = __webpack_require__(36).EVENTS;
 
 	Object.keys(EVENTS).forEach(function(name){
 		if(EVENTS[name] === 0){
@@ -6127,13 +9612,13 @@
 	});
 
 /***/ },
-/* 26 */
+/* 50 */
 /***/ function(module, exports, __webpack_require__) {
 
 	module.exports = Stream;
 
-	var Parser = __webpack_require__(13),
-	    WritableStream = __webpack_require__(27).Writable || __webpack_require__(46).Writable;
+	var Parser = __webpack_require__(37),
+	    WritableStream = __webpack_require__(51).Writable || __webpack_require__(70).Writable;
 
 	function Stream(cbs, options){
 		var parser = this._parser = new Parser(cbs, options);
@@ -6153,7 +9638,7 @@
 	};
 
 /***/ },
-/* 27 */
+/* 51 */
 /***/ function(module, exports, __webpack_require__) {
 
 	// Copyright Joyent, Inc. and other Node contributors.
@@ -6183,11 +9668,11 @@
 	var inherits = __webpack_require__(5);
 
 	inherits(Stream, EE);
-	Stream.Readable = __webpack_require__(28);
-	Stream.Writable = __webpack_require__(42);
-	Stream.Duplex = __webpack_require__(43);
-	Stream.Transform = __webpack_require__(44);
-	Stream.PassThrough = __webpack_require__(45);
+	Stream.Readable = __webpack_require__(52);
+	Stream.Writable = __webpack_require__(66);
+	Stream.Duplex = __webpack_require__(67);
+	Stream.Transform = __webpack_require__(68);
+	Stream.PassThrough = __webpack_require__(69);
 
 	// Backwards-compat with node 0.4.x
 	Stream.Stream = Stream;
@@ -6286,24 +9771,24 @@
 
 
 /***/ },
-/* 28 */
+/* 52 */
 /***/ function(module, exports, __webpack_require__) {
 
-	/* WEBPACK VAR INJECTION */(function(process) {exports = module.exports = __webpack_require__(29);
-	exports.Stream = __webpack_require__(27);
+	/* WEBPACK VAR INJECTION */(function(process) {exports = module.exports = __webpack_require__(53);
+	exports.Stream = __webpack_require__(51);
 	exports.Readable = exports;
-	exports.Writable = __webpack_require__(38);
-	exports.Duplex = __webpack_require__(37);
-	exports.Transform = __webpack_require__(40);
-	exports.PassThrough = __webpack_require__(41);
+	exports.Writable = __webpack_require__(62);
+	exports.Duplex = __webpack_require__(61);
+	exports.Transform = __webpack_require__(64);
+	exports.PassThrough = __webpack_require__(65);
 	if (!process.browser && process.env.READABLE_STREAM === 'disable') {
-	  module.exports = __webpack_require__(27);
+	  module.exports = __webpack_require__(51);
 	}
 
 	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
 
 /***/ },
-/* 29 */
+/* 53 */
 /***/ function(module, exports, __webpack_require__) {
 
 	/* WEBPACK VAR INJECTION */(function(process) {// Copyright Joyent, Inc. and other Node contributors.
@@ -6330,12 +9815,12 @@
 	module.exports = Readable;
 
 	/*<replacement>*/
-	var isArray = __webpack_require__(30);
+	var isArray = __webpack_require__(54);
 	/*</replacement>*/
 
 
 	/*<replacement>*/
-	var Buffer = __webpack_require__(31).Buffer;
+	var Buffer = __webpack_require__(55).Buffer;
 	/*</replacement>*/
 
 	Readable.ReadableState = ReadableState;
@@ -6348,10 +9833,10 @@
 	};
 	/*</replacement>*/
 
-	var Stream = __webpack_require__(27);
+	var Stream = __webpack_require__(51);
 
 	/*<replacement>*/
-	var util = __webpack_require__(35);
+	var util = __webpack_require__(59);
 	util.inherits = __webpack_require__(5);
 	/*</replacement>*/
 
@@ -6359,7 +9844,7 @@
 
 
 	/*<replacement>*/
-	var debug = __webpack_require__(36);
+	var debug = __webpack_require__(60);
 	if (debug && debug.debuglog) {
 	  debug = debug.debuglog('stream');
 	} else {
@@ -6371,7 +9856,7 @@
 	util.inherits(Readable, Stream);
 
 	function ReadableState(options, stream) {
-	  var Duplex = __webpack_require__(37);
+	  var Duplex = __webpack_require__(61);
 
 	  options = options || {};
 
@@ -6432,14 +9917,14 @@
 	  this.encoding = null;
 	  if (options.encoding) {
 	    if (!StringDecoder)
-	      StringDecoder = __webpack_require__(39).StringDecoder;
+	      StringDecoder = __webpack_require__(63).StringDecoder;
 	    this.decoder = new StringDecoder(options.encoding);
 	    this.encoding = options.encoding;
 	  }
 	}
 
 	function Readable(options) {
-	  var Duplex = __webpack_require__(37);
+	  var Duplex = __webpack_require__(61);
 
 	  if (!(this instanceof Readable))
 	    return new Readable(options);
@@ -6542,7 +10027,7 @@
 	// backwards compatibility.
 	Readable.prototype.setEncoding = function(enc) {
 	  if (!StringDecoder)
-	    StringDecoder = __webpack_require__(39).StringDecoder;
+	    StringDecoder = __webpack_require__(63).StringDecoder;
 	  this._readableState.decoder = new StringDecoder(enc);
 	  this._readableState.encoding = enc;
 	  return this;
@@ -7261,7 +10746,7 @@
 	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
 
 /***/ },
-/* 30 */
+/* 54 */
 /***/ function(module, exports) {
 
 	module.exports = Array.isArray || function (arr) {
@@ -7270,7 +10755,7 @@
 
 
 /***/ },
-/* 31 */
+/* 55 */
 /***/ function(module, exports, __webpack_require__) {
 
 	/* WEBPACK VAR INJECTION */(function(Buffer, global) {/*!
@@ -7283,16 +10768,13 @@
 
 	'use strict'
 
-	var base64 = __webpack_require__(32)
-	var ieee754 = __webpack_require__(33)
-	var isArray = __webpack_require__(34)
+	var base64 = __webpack_require__(56)
+	var ieee754 = __webpack_require__(57)
+	var isArray = __webpack_require__(58)
 
 	exports.Buffer = Buffer
 	exports.SlowBuffer = SlowBuffer
 	exports.INSPECT_MAX_BYTES = 50
-	Buffer.poolSize = 8192 // not used by this implementation
-
-	var rootParent = {}
 
 	/**
 	 * If `Buffer.TYPED_ARRAY_SUPPORT`:
@@ -7310,9 +10792,6 @@
 	 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
 	 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
 	 *
-	 *   - Safari 5-7 lacks support for changing the `Object.prototype.constructor` property
-	 *     on objects.
-	 *
 	 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
 	 *
 	 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
@@ -7325,14 +10804,16 @@
 	  ? global.TYPED_ARRAY_SUPPORT
 	  : typedArraySupport()
 
+	/*
+	 * Export kMaxLength after typed array support is determined.
+	 */
+	exports.kMaxLength = kMaxLength()
+
 	function typedArraySupport () {
-	  function Bar () {}
 	  try {
 	    var arr = new Uint8Array(1)
-	    arr.foo = function () { return 42 }
-	    arr.constructor = Bar
+	    arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
 	    return arr.foo() === 42 && // typed array instances can be augmented
-	        arr.constructor === Bar && // constructor can be set
 	        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
 	        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
 	  } catch (e) {
@@ -7346,184 +10827,252 @@
 	    : 0x3fffffff
 	}
 
-	/**
-	 * Class: Buffer
-	 * =============
-	 *
-	 * The Buffer constructor returns instances of `Uint8Array` that are augmented
-	 * with function properties for all the node `Buffer` API functions. We use
-	 * `Uint8Array` so that square bracket notation works as expected -- it returns
-	 * a single octet.
-	 *
-	 * By augmenting the instances, we can avoid modifying the `Uint8Array`
-	 * prototype.
-	 */
-	function Buffer (arg) {
-	  if (!(this instanceof Buffer)) {
-	    // Avoid going through an ArgumentsAdaptorTrampoline in the common case.
-	    if (arguments.length > 1) return new Buffer(arg, arguments[1])
-	    return new Buffer(arg)
+	function createBuffer (that, length) {
+	  if (kMaxLength() < length) {
+	    throw new RangeError('Invalid typed array length')
+	  }
+	  if (Buffer.TYPED_ARRAY_SUPPORT) {
+	    // Return an augmented `Uint8Array` instance, for best performance
+	    that = new Uint8Array(length)
+	    that.__proto__ = Buffer.prototype
+	  } else {
+	    // Fallback: Return an object instance of the Buffer class
+	    if (that === null) {
+	      that = new Buffer(length)
+	    }
+	    that.length = length
 	  }
 
-	  if (!Buffer.TYPED_ARRAY_SUPPORT) {
-	    this.length = 0
-	    this.parent = undefined
+	  return that
+	}
+
+	/**
+	 * The Buffer constructor returns instances of `Uint8Array` that have their
+	 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
+	 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
+	 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
+	 * returns a single octet.
+	 *
+	 * The `Uint8Array` prototype remains unmodified.
+	 */
+
+	function Buffer (arg, encodingOrOffset, length) {
+	  if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
+	    return new Buffer(arg, encodingOrOffset, length)
 	  }
 
 	  // Common case.
 	  if (typeof arg === 'number') {
-	    return fromNumber(this, arg)
+	    if (typeof encodingOrOffset === 'string') {
+	      throw new Error(
+	        'If encoding is specified then the first argument must be a string'
+	      )
+	    }
+	    return allocUnsafe(this, arg)
 	  }
-
-	  // Slightly less common case.
-	  if (typeof arg === 'string') {
-	    return fromString(this, arg, arguments.length > 1 ? arguments[1] : 'utf8')
-	  }
-
-	  // Unusual.
-	  return fromObject(this, arg)
+	  return from(this, arg, encodingOrOffset, length)
 	}
 
-	function fromNumber (that, length) {
-	  that = allocate(that, length < 0 ? 0 : checked(length) | 0)
+	Buffer.poolSize = 8192 // not used by this implementation
+
+	// TODO: Legacy, not needed anymore. Remove in next major version.
+	Buffer._augment = function (arr) {
+	  arr.__proto__ = Buffer.prototype
+	  return arr
+	}
+
+	function from (that, value, encodingOrOffset, length) {
+	  if (typeof value === 'number') {
+	    throw new TypeError('"value" argument must not be a number')
+	  }
+
+	  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
+	    return fromArrayBuffer(that, value, encodingOrOffset, length)
+	  }
+
+	  if (typeof value === 'string') {
+	    return fromString(that, value, encodingOrOffset)
+	  }
+
+	  return fromObject(that, value)
+	}
+
+	/**
+	 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
+	 * if value is a number.
+	 * Buffer.from(str[, encoding])
+	 * Buffer.from(array)
+	 * Buffer.from(buffer)
+	 * Buffer.from(arrayBuffer[, byteOffset[, length]])
+	 **/
+	Buffer.from = function (value, encodingOrOffset, length) {
+	  return from(null, value, encodingOrOffset, length)
+	}
+
+	if (Buffer.TYPED_ARRAY_SUPPORT) {
+	  Buffer.prototype.__proto__ = Uint8Array.prototype
+	  Buffer.__proto__ = Uint8Array
+	  if (typeof Symbol !== 'undefined' && Symbol.species &&
+	      Buffer[Symbol.species] === Buffer) {
+	    // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
+	    Object.defineProperty(Buffer, Symbol.species, {
+	      value: null,
+	      configurable: true
+	    })
+	  }
+	}
+
+	function assertSize (size) {
+	  if (typeof size !== 'number') {
+	    throw new TypeError('"size" argument must be a number')
+	  } else if (size < 0) {
+	    throw new RangeError('"size" argument must not be negative')
+	  }
+	}
+
+	function alloc (that, size, fill, encoding) {
+	  assertSize(size)
+	  if (size <= 0) {
+	    return createBuffer(that, size)
+	  }
+	  if (fill !== undefined) {
+	    // Only pay attention to encoding if it's a string. This
+	    // prevents accidentally sending in a number that would
+	    // be interpretted as a start offset.
+	    return typeof encoding === 'string'
+	      ? createBuffer(that, size).fill(fill, encoding)
+	      : createBuffer(that, size).fill(fill)
+	  }
+	  return createBuffer(that, size)
+	}
+
+	/**
+	 * Creates a new filled Buffer instance.
+	 * alloc(size[, fill[, encoding]])
+	 **/
+	Buffer.alloc = function (size, fill, encoding) {
+	  return alloc(null, size, fill, encoding)
+	}
+
+	function allocUnsafe (that, size) {
+	  assertSize(size)
+	  that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)
 	  if (!Buffer.TYPED_ARRAY_SUPPORT) {
-	    for (var i = 0; i < length; i++) {
+	    for (var i = 0; i < size; ++i) {
 	      that[i] = 0
 	    }
 	  }
 	  return that
 	}
 
+	/**
+	 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
+	 * */
+	Buffer.allocUnsafe = function (size) {
+	  return allocUnsafe(null, size)
+	}
+	/**
+	 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
+	 */
+	Buffer.allocUnsafeSlow = function (size) {
+	  return allocUnsafe(null, size)
+	}
+
 	function fromString (that, string, encoding) {
-	  if (typeof encoding !== 'string' || encoding === '') encoding = 'utf8'
+	  if (typeof encoding !== 'string' || encoding === '') {
+	    encoding = 'utf8'
+	  }
+
+	  if (!Buffer.isEncoding(encoding)) {
+	    throw new TypeError('"encoding" must be a valid string encoding')
+	  }
 
-	  // Assumption: byteLength() return value is always < kMaxLength.
 	  var length = byteLength(string, encoding) | 0
-	  that = allocate(that, length)
+	  that = createBuffer(that, length)
 
-	  that.write(string, encoding)
-	  return that
-	}
+	  var actual = that.write(string, encoding)
 
-	function fromObject (that, object) {
-	  if (Buffer.isBuffer(object)) return fromBuffer(that, object)
-
-	  if (isArray(object)) return fromArray(that, object)
-
-	  if (object == null) {
-	    throw new TypeError('must start with number, buffer, array or string')
+	  if (actual !== length) {
+	    // Writing a hex string, for example, that contains invalid characters will
+	    // cause everything after the first invalid character to be ignored. (e.g.
+	    // 'abxxcd' will be treated as 'ab')
+	    that = that.slice(0, actual)
 	  }
 
-	  if (typeof ArrayBuffer !== 'undefined') {
-	    if (object.buffer instanceof ArrayBuffer) {
-	      return fromTypedArray(that, object)
-	    }
-	    if (object instanceof ArrayBuffer) {
-	      return fromArrayBuffer(that, object)
-	    }
-	  }
-
-	  if (object.length) return fromArrayLike(that, object)
-
-	  return fromJsonObject(that, object)
-	}
-
-	function fromBuffer (that, buffer) {
-	  var length = checked(buffer.length) | 0
-	  that = allocate(that, length)
-	  buffer.copy(that, 0, 0, length)
-	  return that
-	}
-
-	function fromArray (that, array) {
-	  var length = checked(array.length) | 0
-	  that = allocate(that, length)
-	  for (var i = 0; i < length; i += 1) {
-	    that[i] = array[i] & 255
-	  }
-	  return that
-	}
-
-	// Duplicate of fromArray() to keep fromArray() monomorphic.
-	function fromTypedArray (that, array) {
-	  var length = checked(array.length) | 0
-	  that = allocate(that, length)
-	  // Truncating the elements is probably not what people expect from typed
-	  // arrays with BYTES_PER_ELEMENT > 1 but it's compatible with the behavior
-	  // of the old Buffer constructor.
-	  for (var i = 0; i < length; i += 1) {
-	    that[i] = array[i] & 255
-	  }
-	  return that
-	}
-
-	function fromArrayBuffer (that, array) {
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    // Return an augmented `Uint8Array` instance, for best performance
-	    array.byteLength
-	    that = Buffer._augment(new Uint8Array(array))
-	  } else {
-	    // Fallback: Return an object instance of the Buffer class
-	    that = fromTypedArray(that, new Uint8Array(array))
-	  }
 	  return that
 	}
 
 	function fromArrayLike (that, array) {
-	  var length = checked(array.length) | 0
-	  that = allocate(that, length)
+	  var length = array.length < 0 ? 0 : checked(array.length) | 0
+	  that = createBuffer(that, length)
 	  for (var i = 0; i < length; i += 1) {
 	    that[i] = array[i] & 255
 	  }
 	  return that
 	}
 
-	// Deserialize { type: 'Buffer', data: [1,2,3,...] } into a Buffer object.
-	// Returns a zero-length buffer for inputs that don't conform to the spec.
-	function fromJsonObject (that, object) {
-	  var array
-	  var length = 0
+	function fromArrayBuffer (that, array, byteOffset, length) {
+	  array.byteLength // this throws if `array` is not a valid ArrayBuffer
 
-	  if (object.type === 'Buffer' && isArray(object.data)) {
-	    array = object.data
-	    length = checked(array.length) | 0
+	  if (byteOffset < 0 || array.byteLength < byteOffset) {
+	    throw new RangeError('\'offset\' is out of bounds')
 	  }
-	  that = allocate(that, length)
 
-	  for (var i = 0; i < length; i += 1) {
-	    that[i] = array[i] & 255
+	  if (array.byteLength < byteOffset + (length || 0)) {
+	    throw new RangeError('\'length\' is out of bounds')
 	  }
-	  return that
-	}
 
-	if (Buffer.TYPED_ARRAY_SUPPORT) {
-	  Buffer.prototype.__proto__ = Uint8Array.prototype
-	  Buffer.__proto__ = Uint8Array
-	} else {
-	  // pre-set for values that may exist in the future
-	  Buffer.prototype.length = undefined
-	  Buffer.prototype.parent = undefined
-	}
+	  if (byteOffset === undefined && length === undefined) {
+	    array = new Uint8Array(array)
+	  } else if (length === undefined) {
+	    array = new Uint8Array(array, byteOffset)
+	  } else {
+	    array = new Uint8Array(array, byteOffset, length)
+	  }
 
-	function allocate (that, length) {
 	  if (Buffer.TYPED_ARRAY_SUPPORT) {
 	    // Return an augmented `Uint8Array` instance, for best performance
-	    that = Buffer._augment(new Uint8Array(length))
+	    that = array
 	    that.__proto__ = Buffer.prototype
 	  } else {
 	    // Fallback: Return an object instance of the Buffer class
-	    that.length = length
-	    that._isBuffer = true
+	    that = fromArrayLike(that, array)
 	  }
-
-	  var fromPool = length !== 0 && length <= Buffer.poolSize >>> 1
-	  if (fromPool) that.parent = rootParent
-
 	  return that
 	}
 
+	function fromObject (that, obj) {
+	  if (Buffer.isBuffer(obj)) {
+	    var len = checked(obj.length) | 0
+	    that = createBuffer(that, len)
+
+	    if (that.length === 0) {
+	      return that
+	    }
+
+	    obj.copy(that, 0, 0, len)
+	    return that
+	  }
+
+	  if (obj) {
+	    if ((typeof ArrayBuffer !== 'undefined' &&
+	        obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
+	      if (typeof obj.length !== 'number' || isnan(obj.length)) {
+	        return createBuffer(that, 0)
+	      }
+	      return fromArrayLike(that, obj)
+	    }
+
+	    if (obj.type === 'Buffer' && isArray(obj.data)) {
+	      return fromArrayLike(that, obj.data)
+	    }
+	  }
+
+	  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
+	}
+
 	function checked (length) {
-	  // Note: cannot use `length < kMaxLength` here because that fails when
+	  // Note: cannot use `length < kMaxLength()` here because that fails when
 	  // length is NaN (which is otherwise coerced to zero.)
 	  if (length >= kMaxLength()) {
 	    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
@@ -7532,12 +11081,11 @@
 	  return length | 0
 	}
 
-	function SlowBuffer (subject, encoding) {
-	  if (!(this instanceof SlowBuffer)) return new SlowBuffer(subject, encoding)
-
-	  var buf = new Buffer(subject, encoding)
-	  delete buf.parent
-	  return buf
+	function SlowBuffer (length) {
+	  if (+length != length) { // eslint-disable-line eqeqeq
+	    length = 0
+	  }
+	  return Buffer.alloc(+length)
 	}
 
 	Buffer.isBuffer = function isBuffer (b) {
@@ -7554,17 +11102,12 @@
 	  var x = a.length
 	  var y = b.length
 
-	  var i = 0
-	  var len = Math.min(x, y)
-	  while (i < len) {
-	    if (a[i] !== b[i]) break
-
-	    ++i
-	  }
-
-	  if (i !== len) {
-	    x = a[i]
-	    y = b[i]
+	  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
+	    if (a[i] !== b[i]) {
+	      x = a[i]
+	      y = b[i]
+	      break
+	    }
 	  }
 
 	  if (x < y) return -1
@@ -7578,9 +11121,9 @@
 	    case 'utf8':
 	    case 'utf-8':
 	    case 'ascii':
+	    case 'latin1':
 	    case 'binary':
 	    case 'base64':
-	    case 'raw':
 	    case 'ucs2':
 	    case 'ucs-2':
 	    case 'utf16le':
@@ -7592,32 +11135,46 @@
 	}
 
 	Buffer.concat = function concat (list, length) {
-	  if (!isArray(list)) throw new TypeError('list argument must be an Array of Buffers.')
+	  if (!isArray(list)) {
+	    throw new TypeError('"list" argument must be an Array of Buffers')
+	  }
 
 	  if (list.length === 0) {
-	    return new Buffer(0)
+	    return Buffer.alloc(0)
 	  }
 
 	  var i
 	  if (length === undefined) {
 	    length = 0
-	    for (i = 0; i < list.length; i++) {
+	    for (i = 0; i < list.length; ++i) {
 	      length += list[i].length
 	    }
 	  }
 
-	  var buf = new Buffer(length)
+	  var buffer = Buffer.allocUnsafe(length)
 	  var pos = 0
-	  for (i = 0; i < list.length; i++) {
-	    var item = list[i]
-	    item.copy(buf, pos)
-	    pos += item.length
+	  for (i = 0; i < list.length; ++i) {
+	    var buf = list[i]
+	    if (!Buffer.isBuffer(buf)) {
+	      throw new TypeError('"list" argument must be an Array of Buffers')
+	    }
+	    buf.copy(buffer, pos)
+	    pos += buf.length
 	  }
-	  return buf
+	  return buffer
 	}
 
 	function byteLength (string, encoding) {
-	  if (typeof string !== 'string') string = '' + string
+	  if (Buffer.isBuffer(string)) {
+	    return string.length
+	  }
+	  if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
+	      (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
+	    return string.byteLength
+	  }
+	  if (typeof string !== 'string') {
+	    string = '' + string
+	  }
 
 	  var len = string.length
 	  if (len === 0) return 0
@@ -7627,13 +11184,12 @@
 	  for (;;) {
 	    switch (encoding) {
 	      case 'ascii':
+	      case 'latin1':
 	      case 'binary':
-	      // Deprecated
-	      case 'raw':
-	      case 'raws':
 	        return len
 	      case 'utf8':
 	      case 'utf-8':
+	      case undefined:
 	        return utf8ToBytes(string).length
 	      case 'ucs2':
 	      case 'ucs-2':
@@ -7656,13 +11212,39 @@
 	function slowToString (encoding, start, end) {
 	  var loweredCase = false
 
-	  start = start | 0
-	  end = end === undefined || end === Infinity ? this.length : end | 0
+	  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
+	  // property of a typed array.
+
+	  // This behaves neither like String nor Uint8Array in that we set start/end
+	  // to their upper/lower bounds if the value passed is out of range.
+	  // undefined is handled specially as per ECMA-262 6th Edition,
+	  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
+	  if (start === undefined || start < 0) {
+	    start = 0
+	  }
+	  // Return early if start > this.length. Done here to prevent potential uint32
+	  // coercion fail below.
+	  if (start > this.length) {
+	    return ''
+	  }
+
+	  if (end === undefined || end > this.length) {
+	    end = this.length
+	  }
+
+	  if (end <= 0) {
+	    return ''
+	  }
+
+	  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
+	  end >>>= 0
+	  start >>>= 0
+
+	  if (end <= start) {
+	    return ''
+	  }
 
 	  if (!encoding) encoding = 'utf8'
-	  if (start < 0) start = 0
-	  if (end > this.length) end = this.length
-	  if (end <= start) return ''
 
 	  while (true) {
 	    switch (encoding) {
@@ -7676,8 +11258,9 @@
 	      case 'ascii':
 	        return asciiSlice(this, start, end)
 
+	      case 'latin1':
 	      case 'binary':
-	        return binarySlice(this, start, end)
+	        return latin1Slice(this, start, end)
 
 	      case 'base64':
 	        return base64Slice(this, start, end)
@@ -7696,6 +11279,53 @@
 	  }
 	}
 
+	// The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
+	// Buffer instances.
+	Buffer.prototype._isBuffer = true
+
+	function swap (b, n, m) {
+	  var i = b[n]
+	  b[n] = b[m]
+	  b[m] = i
+	}
+
+	Buffer.prototype.swap16 = function swap16 () {
+	  var len = this.length
+	  if (len % 2 !== 0) {
+	    throw new RangeError('Buffer size must be a multiple of 16-bits')
+	  }
+	  for (var i = 0; i < len; i += 2) {
+	    swap(this, i, i + 1)
+	  }
+	  return this
+	}
+
+	Buffer.prototype.swap32 = function swap32 () {
+	  var len = this.length
+	  if (len % 4 !== 0) {
+	    throw new RangeError('Buffer size must be a multiple of 32-bits')
+	  }
+	  for (var i = 0; i < len; i += 4) {
+	    swap(this, i, i + 3)
+	    swap(this, i + 1, i + 2)
+	  }
+	  return this
+	}
+
+	Buffer.prototype.swap64 = function swap64 () {
+	  var len = this.length
+	  if (len % 8 !== 0) {
+	    throw new RangeError('Buffer size must be a multiple of 64-bits')
+	  }
+	  for (var i = 0; i < len; i += 8) {
+	    swap(this, i, i + 7)
+	    swap(this, i + 1, i + 6)
+	    swap(this, i + 2, i + 5)
+	    swap(this, i + 3, i + 4)
+	  }
+	  return this
+	}
+
 	Buffer.prototype.toString = function toString () {
 	  var length = this.length | 0
 	  if (length === 0) return ''
@@ -7719,63 +11349,197 @@
 	  return '<Buffer ' + str + '>'
 	}
 
-	Buffer.prototype.compare = function compare (b) {
-	  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
-	  if (this === b) return 0
-	  return Buffer.compare(this, b)
+	Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
+	  if (!Buffer.isBuffer(target)) {
+	    throw new TypeError('Argument must be a Buffer')
+	  }
+
+	  if (start === undefined) {
+	    start = 0
+	  }
+	  if (end === undefined) {
+	    end = target ? target.length : 0
+	  }
+	  if (thisStart === undefined) {
+	    thisStart = 0
+	  }
+	  if (thisEnd === undefined) {
+	    thisEnd = this.length
+	  }
+
+	  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
+	    throw new RangeError('out of range index')
+	  }
+
+	  if (thisStart >= thisEnd && start >= end) {
+	    return 0
+	  }
+	  if (thisStart >= thisEnd) {
+	    return -1
+	  }
+	  if (start >= end) {
+	    return 1
+	  }
+
+	  start >>>= 0
+	  end >>>= 0
+	  thisStart >>>= 0
+	  thisEnd >>>= 0
+
+	  if (this === target) return 0
+
+	  var x = thisEnd - thisStart
+	  var y = end - start
+	  var len = Math.min(x, y)
+
+	  var thisCopy = this.slice(thisStart, thisEnd)
+	  var targetCopy = target.slice(start, end)
+
+	  for (var i = 0; i < len; ++i) {
+	    if (thisCopy[i] !== targetCopy[i]) {
+	      x = thisCopy[i]
+	      y = targetCopy[i]
+	      break
+	    }
+	  }
+
+	  if (x < y) return -1
+	  if (y < x) return 1
+	  return 0
 	}
 
-	Buffer.prototype.indexOf = function indexOf (val, byteOffset) {
-	  if (byteOffset > 0x7fffffff) byteOffset = 0x7fffffff
-	  else if (byteOffset < -0x80000000) byteOffset = -0x80000000
-	  byteOffset >>= 0
+	// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
+	// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
+	//
+	// Arguments:
+	// - buffer - a Buffer to search
+	// - val - a string, Buffer, or number
+	// - byteOffset - an index into `buffer`; will be clamped to an int32
+	// - encoding - an optional encoding, relevant is val is a string
+	// - dir - true for indexOf, false for lastIndexOf
+	function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
+	  // Empty buffer means no match
+	  if (buffer.length === 0) return -1
 
-	  if (this.length === 0) return -1
-	  if (byteOffset >= this.length) return -1
+	  // Normalize byteOffset
+	  if (typeof byteOffset === 'string') {
+	    encoding = byteOffset
+	    byteOffset = 0
+	  } else if (byteOffset > 0x7fffffff) {
+	    byteOffset = 0x7fffffff
+	  } else if (byteOffset < -0x80000000) {
+	    byteOffset = -0x80000000
+	  }
+	  byteOffset = +byteOffset  // Coerce to Number.
+	  if (isNaN(byteOffset)) {
+	    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
+	    byteOffset = dir ? 0 : (buffer.length - 1)
+	  }
 
-	  // Negative offsets start from the end of the buffer
-	  if (byteOffset < 0) byteOffset = Math.max(this.length + byteOffset, 0)
+	  // Normalize byteOffset: negative offsets start from the end of the buffer
+	  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
+	  if (byteOffset >= buffer.length) {
+	    if (dir) return -1
+	    else byteOffset = buffer.length - 1
+	  } else if (byteOffset < 0) {
+	    if (dir) byteOffset = 0
+	    else return -1
+	  }
 
+	  // Normalize val
 	  if (typeof val === 'string') {
-	    if (val.length === 0) return -1 // special case: looking for empty string always fails
-	    return String.prototype.indexOf.call(this, val, byteOffset)
-	  }
-	  if (Buffer.isBuffer(val)) {
-	    return arrayIndexOf(this, val, byteOffset)
-	  }
-	  if (typeof val === 'number') {
-	    if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
-	      return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
-	    }
-	    return arrayIndexOf(this, [ val ], byteOffset)
+	    val = Buffer.from(val, encoding)
 	  }
 
-	  function arrayIndexOf (arr, val, byteOffset) {
-	    var foundIndex = -1
-	    for (var i = 0; byteOffset + i < arr.length; i++) {
-	      if (arr[byteOffset + i] === val[foundIndex === -1 ? 0 : i - foundIndex]) {
-	        if (foundIndex === -1) foundIndex = i
-	        if (i - foundIndex + 1 === val.length) return byteOffset + foundIndex
+	  // Finally, search either indexOf (if dir is true) or lastIndexOf
+	  if (Buffer.isBuffer(val)) {
+	    // Special case: looking for empty string/buffer always fails
+	    if (val.length === 0) {
+	      return -1
+	    }
+	    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
+	  } else if (typeof val === 'number') {
+	    val = val & 0xFF // Search for a byte value [0-255]
+	    if (Buffer.TYPED_ARRAY_SUPPORT &&
+	        typeof Uint8Array.prototype.indexOf === 'function') {
+	      if (dir) {
+	        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
 	      } else {
-	        foundIndex = -1
+	        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
 	      }
 	    }
-	    return -1
+	    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
 	  }
 
 	  throw new TypeError('val must be string, number or Buffer')
 	}
 
-	// `get` is deprecated
-	Buffer.prototype.get = function get (offset) {
-	  console.log('.get() is deprecated. Access using array indexes instead.')
-	  return this.readUInt8(offset)
+	function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
+	  var indexSize = 1
+	  var arrLength = arr.length
+	  var valLength = val.length
+
+	  if (encoding !== undefined) {
+	    encoding = String(encoding).toLowerCase()
+	    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
+	        encoding === 'utf16le' || encoding === 'utf-16le') {
+	      if (arr.length < 2 || val.length < 2) {
+	        return -1
+	      }
+	      indexSize = 2
+	      arrLength /= 2
+	      valLength /= 2
+	      byteOffset /= 2
+	    }
+	  }
+
+	  function read (buf, i) {
+	    if (indexSize === 1) {
+	      return buf[i]
+	    } else {
+	      return buf.readUInt16BE(i * indexSize)
+	    }
+	  }
+
+	  var i
+	  if (dir) {
+	    var foundIndex = -1
+	    for (i = byteOffset; i < arrLength; i++) {
+	      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
+	        if (foundIndex === -1) foundIndex = i
+	        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
+	      } else {
+	        if (foundIndex !== -1) i -= i - foundIndex
+	        foundIndex = -1
+	      }
+	    }
+	  } else {
+	    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
+	    for (i = byteOffset; i >= 0; i--) {
+	      var found = true
+	      for (var j = 0; j < valLength; j++) {
+	        if (read(arr, i + j) !== read(val, j)) {
+	          found = false
+	          break
+	        }
+	      }
+	      if (found) return i
+	    }
+	  }
+
+	  return -1
 	}
 
-	// `set` is deprecated
-	Buffer.prototype.set = function set (v, offset) {
-	  console.log('.set() is deprecated. Access using array indexes instead.')
-	  return this.writeUInt8(v, offset)
+	Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
+	  return this.indexOf(val, byteOffset, encoding) !== -1
+	}
+
+	Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
+	  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
+	}
+
+	Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
+	  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
 	}
 
 	function hexWrite (buf, string, offset, length) {
@@ -7792,14 +11556,14 @@
 
 	  // must be an even number of digits
 	  var strLen = string.length
-	  if (strLen % 2 !== 0) throw new Error('Invalid hex string')
+	  if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')
 
 	  if (length > strLen / 2) {
 	    length = strLen / 2
 	  }
-	  for (var i = 0; i < length; i++) {
+	  for (var i = 0; i < length; ++i) {
 	    var parsed = parseInt(string.substr(i * 2, 2), 16)
-	    if (isNaN(parsed)) throw new Error('Invalid hex string')
+	    if (isNaN(parsed)) return i
 	    buf[offset + i] = parsed
 	  }
 	  return i
@@ -7813,7 +11577,7 @@
 	  return blitBuffer(asciiToBytes(string), buf, offset, length)
 	}
 
-	function binaryWrite (buf, string, offset, length) {
+	function latin1Write (buf, string, offset, length) {
 	  return asciiWrite(buf, string, offset, length)
 	}
 
@@ -7848,17 +11612,16 @@
 	    }
 	  // legacy write(string, encoding, offset, length) - remove in v0.13
 	  } else {
-	    var swap = encoding
-	    encoding = offset
-	    offset = length | 0
-	    length = swap
+	    throw new Error(
+	      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
+	    )
 	  }
 
 	  var remaining = this.length - offset
 	  if (length === undefined || length > remaining) length = remaining
 
 	  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
-	    throw new RangeError('attempt to write outside buffer bounds')
+	    throw new RangeError('Attempt to write outside buffer bounds')
 	  }
 
 	  if (!encoding) encoding = 'utf8'
@@ -7876,8 +11639,9 @@
 	      case 'ascii':
 	        return asciiWrite(this, string, offset, length)
 
+	      case 'latin1':
 	      case 'binary':
-	        return binaryWrite(this, string, offset, length)
+	        return latin1Write(this, string, offset, length)
 
 	      case 'base64':
 	        // Warning: maxLength not taken into account in base64Write
@@ -8012,17 +11776,17 @@
 	  var ret = ''
 	  end = Math.min(buf.length, end)
 
-	  for (var i = start; i < end; i++) {
+	  for (var i = start; i < end; ++i) {
 	    ret += String.fromCharCode(buf[i] & 0x7F)
 	  }
 	  return ret
 	}
 
-	function binarySlice (buf, start, end) {
+	function latin1Slice (buf, start, end) {
 	  var ret = ''
 	  end = Math.min(buf.length, end)
 
-	  for (var i = start; i < end; i++) {
+	  for (var i = start; i < end; ++i) {
 	    ret += String.fromCharCode(buf[i])
 	  }
 	  return ret
@@ -8035,7 +11799,7 @@
 	  if (!end || end < 0 || end > len) end = len
 
 	  var out = ''
-	  for (var i = start; i < end; i++) {
+	  for (var i = start; i < end; ++i) {
 	    out += toHex(buf[i])
 	  }
 	  return out
@@ -8073,17 +11837,16 @@
 
 	  var newBuf
 	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    newBuf = Buffer._augment(this.subarray(start, end))
+	    newBuf = this.subarray(start, end)
+	    newBuf.__proto__ = Buffer.prototype
 	  } else {
 	    var sliceLen = end - start
 	    newBuf = new Buffer(sliceLen, undefined)
-	    for (var i = 0; i < sliceLen; i++) {
+	    for (var i = 0; i < sliceLen; ++i) {
 	      newBuf[i] = this[i + start]
 	    }
 	  }
 
-	  if (newBuf.length) newBuf.parent = this.parent || this
-
 	  return newBuf
 	}
 
@@ -8252,16 +12015,19 @@
 	}
 
 	function checkInt (buf, value, offset, ext, max, min) {
-	  if (!Buffer.isBuffer(buf)) throw new TypeError('buffer must be a Buffer instance')
-	  if (value > max || value < min) throw new RangeError('value is out of bounds')
-	  if (offset + ext > buf.length) throw new RangeError('index out of range')
+	  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
+	  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
+	  if (offset + ext > buf.length) throw new RangeError('Index out of range')
 	}
 
 	Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
 	  value = +value
 	  offset = offset | 0
 	  byteLength = byteLength | 0
-	  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
+	  if (!noAssert) {
+	    var maxBytes = Math.pow(2, 8 * byteLength) - 1
+	    checkInt(this, value, offset, byteLength, maxBytes, 0)
+	  }
 
 	  var mul = 1
 	  var i = 0
@@ -8277,7 +12043,10 @@
 	  value = +value
 	  offset = offset | 0
 	  byteLength = byteLength | 0
-	  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
+	  if (!noAssert) {
+	    var maxBytes = Math.pow(2, 8 * byteLength) - 1
+	    checkInt(this, value, offset, byteLength, maxBytes, 0)
+	  }
 
 	  var i = byteLength - 1
 	  var mul = 1
@@ -8300,7 +12069,7 @@
 
 	function objectWriteUInt16 (buf, value, offset, littleEndian) {
 	  if (value < 0) value = 0xffff + value + 1
-	  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
+	  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {
 	    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
 	      (littleEndian ? i : 1 - i) * 8
 	  }
@@ -8334,7 +12103,7 @@
 
 	function objectWriteUInt32 (buf, value, offset, littleEndian) {
 	  if (value < 0) value = 0xffffffff + value + 1
-	  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
+	  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {
 	    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
 	  }
 	}
@@ -8380,9 +12149,12 @@
 
 	  var i = 0
 	  var mul = 1
-	  var sub = value < 0 ? 1 : 0
+	  var sub = 0
 	  this[offset] = value & 0xFF
 	  while (++i < byteLength && (mul *= 0x100)) {
+	    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
+	      sub = 1
+	    }
 	    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
 	  }
 
@@ -8400,9 +12172,12 @@
 
 	  var i = byteLength - 1
 	  var mul = 1
-	  var sub = value < 0 ? 1 : 0
+	  var sub = 0
 	  this[offset + i] = value & 0xFF
 	  while (--i >= 0 && (mul *= 0x100)) {
+	    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
+	      sub = 1
+	    }
 	    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
 	  }
 
@@ -8477,9 +12252,8 @@
 	}
 
 	function checkIEEE754 (buf, value, offset, ext, max, min) {
-	  if (value > max || value < min) throw new RangeError('value is out of bounds')
-	  if (offset + ext > buf.length) throw new RangeError('index out of range')
-	  if (offset < 0) throw new RangeError('index out of range')
+	  if (offset + ext > buf.length) throw new RangeError('Index out of range')
+	  if (offset < 0) throw new RangeError('Index out of range')
 	}
 
 	function writeFloat (buf, value, offset, littleEndian, noAssert) {
@@ -8544,143 +12318,91 @@
 
 	  if (this === target && start < targetStart && targetStart < end) {
 	    // descending copy from end
-	    for (i = len - 1; i >= 0; i--) {
+	    for (i = len - 1; i >= 0; --i) {
 	      target[i + targetStart] = this[i + start]
 	    }
 	  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
 	    // ascending copy from start
-	    for (i = 0; i < len; i++) {
+	    for (i = 0; i < len; ++i) {
 	      target[i + targetStart] = this[i + start]
 	    }
 	  } else {
-	    target._set(this.subarray(start, start + len), targetStart)
+	    Uint8Array.prototype.set.call(
+	      target,
+	      this.subarray(start, start + len),
+	      targetStart
+	    )
 	  }
 
 	  return len
 	}
 
-	// fill(value, start=0, end=buffer.length)
-	Buffer.prototype.fill = function fill (value, start, end) {
-	  if (!value) value = 0
-	  if (!start) start = 0
-	  if (!end) end = this.length
+	// Usage:
+	//    buffer.fill(number[, offset[, end]])
+	//    buffer.fill(buffer[, offset[, end]])
+	//    buffer.fill(string[, offset[, end]][, encoding])
+	Buffer.prototype.fill = function fill (val, start, end, encoding) {
+	  // Handle string cases:
+	  if (typeof val === 'string') {
+	    if (typeof start === 'string') {
+	      encoding = start
+	      start = 0
+	      end = this.length
+	    } else if (typeof end === 'string') {
+	      encoding = end
+	      end = this.length
+	    }
+	    if (val.length === 1) {
+	      var code = val.charCodeAt(0)
+	      if (code < 256) {
+	        val = code
+	      }
+	    }
+	    if (encoding !== undefined && typeof encoding !== 'string') {
+	      throw new TypeError('encoding must be a string')
+	    }
+	    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
+	      throw new TypeError('Unknown encoding: ' + encoding)
+	    }
+	  } else if (typeof val === 'number') {
+	    val = val & 255
+	  }
 
-	  if (end < start) throw new RangeError('end < start')
+	  // Invalid ranges are not set to a default, so can range check early.
+	  if (start < 0 || this.length < start || this.length < end) {
+	    throw new RangeError('Out of range index')
+	  }
 
-	  // Fill 0 bytes; we're done
-	  if (end === start) return
-	  if (this.length === 0) return
+	  if (end <= start) {
+	    return this
+	  }
 
-	  if (start < 0 || start >= this.length) throw new RangeError('start out of bounds')
-	  if (end < 0 || end > this.length) throw new RangeError('end out of bounds')
+	  start = start >>> 0
+	  end = end === undefined ? this.length : end >>> 0
+
+	  if (!val) val = 0
 
 	  var i
-	  if (typeof value === 'number') {
-	    for (i = start; i < end; i++) {
-	      this[i] = value
+	  if (typeof val === 'number') {
+	    for (i = start; i < end; ++i) {
+	      this[i] = val
 	    }
 	  } else {
-	    var bytes = utf8ToBytes(value.toString())
+	    var bytes = Buffer.isBuffer(val)
+	      ? val
+	      : utf8ToBytes(new Buffer(val, encoding).toString())
 	    var len = bytes.length
-	    for (i = start; i < end; i++) {
-	      this[i] = bytes[i % len]
+	    for (i = 0; i < end - start; ++i) {
+	      this[i + start] = bytes[i % len]
 	    }
 	  }
 
 	  return this
 	}
 
-	/**
-	 * Creates a new `ArrayBuffer` with the *copied* memory of the buffer instance.
-	 * Added in Node 0.12. Only available in browsers that support ArrayBuffer.
-	 */
-	Buffer.prototype.toArrayBuffer = function toArrayBuffer () {
-	  if (typeof Uint8Array !== 'undefined') {
-	    if (Buffer.TYPED_ARRAY_SUPPORT) {
-	      return (new Buffer(this)).buffer
-	    } else {
-	      var buf = new Uint8Array(this.length)
-	      for (var i = 0, len = buf.length; i < len; i += 1) {
-	        buf[i] = this[i]
-	      }
-	      return buf.buffer
-	    }
-	  } else {
-	    throw new TypeError('Buffer.toArrayBuffer not supported in this browser')
-	  }
-	}
-
 	// HELPER FUNCTIONS
 	// ================
 
-	var BP = Buffer.prototype
-
-	/**
-	 * Augment a Uint8Array *instance* (not the Uint8Array class!) with Buffer methods
-	 */
-	Buffer._augment = function _augment (arr) {
-	  arr.constructor = Buffer
-	  arr._isBuffer = true
-
-	  // save reference to original Uint8Array set method before overwriting
-	  arr._set = arr.set
-
-	  // deprecated
-	  arr.get = BP.get
-	  arr.set = BP.set
-
-	  arr.write = BP.write
-	  arr.toString = BP.toString
-	  arr.toLocaleString = BP.toString
-	  arr.toJSON = BP.toJSON
-	  arr.equals = BP.equals
-	  arr.compare = BP.compare
-	  arr.indexOf = BP.indexOf
-	  arr.copy = BP.copy
-	  arr.slice = BP.slice
-	  arr.readUIntLE = BP.readUIntLE
-	  arr.readUIntBE = BP.readUIntBE
-	  arr.readUInt8 = BP.readUInt8
-	  arr.readUInt16LE = BP.readUInt16LE
-	  arr.readUInt16BE = BP.readUInt16BE
-	  arr.readUInt32LE = BP.readUInt32LE
-	  arr.readUInt32BE = BP.readUInt32BE
-	  arr.readIntLE = BP.readIntLE
-	  arr.readIntBE = BP.readIntBE
-	  arr.readInt8 = BP.readInt8
-	  arr.readInt16LE = BP.readInt16LE
-	  arr.readInt16BE = BP.readInt16BE
-	  arr.readInt32LE = BP.readInt32LE
-	  arr.readInt32BE = BP.readInt32BE
-	  arr.readFloatLE = BP.readFloatLE
-	  arr.readFloatBE = BP.readFloatBE
-	  arr.readDoubleLE = BP.readDoubleLE
-	  arr.readDoubleBE = BP.readDoubleBE
-	  arr.writeUInt8 = BP.writeUInt8
-	  arr.writeUIntLE = BP.writeUIntLE
-	  arr.writeUIntBE = BP.writeUIntBE
-	  arr.writeUInt16LE = BP.writeUInt16LE
-	  arr.writeUInt16BE = BP.writeUInt16BE
-	  arr.writeUInt32LE = BP.writeUInt32LE
-	  arr.writeUInt32BE = BP.writeUInt32BE
-	  arr.writeIntLE = BP.writeIntLE
-	  arr.writeIntBE = BP.writeIntBE
-	  arr.writeInt8 = BP.writeInt8
-	  arr.writeInt16LE = BP.writeInt16LE
-	  arr.writeInt16BE = BP.writeInt16BE
-	  arr.writeInt32LE = BP.writeInt32LE
-	  arr.writeInt32BE = BP.writeInt32BE
-	  arr.writeFloatLE = BP.writeFloatLE
-	  arr.writeFloatBE = BP.writeFloatBE
-	  arr.writeDoubleLE = BP.writeDoubleLE
-	  arr.writeDoubleBE = BP.writeDoubleBE
-	  arr.fill = BP.fill
-	  arr.inspect = BP.inspect
-	  arr.toArrayBuffer = BP.toArrayBuffer
-
-	  return arr
-	}
-
 	var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g
 
 	function base64clean (str) {
@@ -8712,7 +12434,7 @@
 	  var leadSurrogate = null
 	  var bytes = []
 
-	  for (var i = 0; i < length; i++) {
+	  for (var i = 0; i < length; ++i) {
 	    codePoint = string.charCodeAt(i)
 
 	    // is surrogate component
@@ -8787,7 +12509,7 @@
 
 	function asciiToBytes (str) {
 	  var byteArray = []
-	  for (var i = 0; i < str.length; i++) {
+	  for (var i = 0; i < str.length; ++i) {
 	    // Node's code seems to be doing this and not & 0x7F..
 	    byteArray.push(str.charCodeAt(i) & 0xFF)
 	  }
@@ -8797,7 +12519,7 @@
 	function utf16leToBytes (str, units) {
 	  var c, hi, lo
 	  var byteArray = []
-	  for (var i = 0; i < str.length; i++) {
+	  for (var i = 0; i < str.length; ++i) {
 	    if ((units -= 2) < 0) break
 
 	    c = str.charCodeAt(i)
@@ -8815,147 +12537,136 @@
 	}
 
 	function blitBuffer (src, dst, offset, length) {
-	  for (var i = 0; i < length; i++) {
+	  for (var i = 0; i < length; ++i) {
 	    if ((i + offset >= dst.length) || (i >= src.length)) break
 	    dst[i + offset] = src[i]
 	  }
 	  return i
 	}
 
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(31).Buffer, (function() { return this; }())))
+	function isnan (val) {
+	  return val !== val // eslint-disable-line no-self-compare
+	}
+
+	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(55).Buffer, (function() { return this; }())))
 
 /***/ },
-/* 32 */
-/***/ function(module, exports, __webpack_require__) {
+/* 56 */
+/***/ function(module, exports) {
 
-	var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+	'use strict'
 
-	;(function (exports) {
-		'use strict';
+	exports.toByteArray = toByteArray
+	exports.fromByteArray = fromByteArray
 
-	  var Arr = (typeof Uint8Array !== 'undefined')
-	    ? Uint8Array
-	    : Array
+	var lookup = []
+	var revLookup = []
+	var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
 
-		var PLUS   = '+'.charCodeAt(0)
-		var SLASH  = '/'.charCodeAt(0)
-		var NUMBER = '0'.charCodeAt(0)
-		var LOWER  = 'a'.charCodeAt(0)
-		var UPPER  = 'A'.charCodeAt(0)
-		var PLUS_URL_SAFE = '-'.charCodeAt(0)
-		var SLASH_URL_SAFE = '_'.charCodeAt(0)
+	function init () {
+	  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+	  for (var i = 0, len = code.length; i < len; ++i) {
+	    lookup[i] = code[i]
+	    revLookup[code.charCodeAt(i)] = i
+	  }
 
-		function decode (elt) {
-			var code = elt.charCodeAt(0)
-			if (code === PLUS ||
-			    code === PLUS_URL_SAFE)
-				return 62 // '+'
-			if (code === SLASH ||
-			    code === SLASH_URL_SAFE)
-				return 63 // '/'
-			if (code < NUMBER)
-				return -1 //no match
-			if (code < NUMBER + 10)
-				return code - NUMBER + 26 + 26
-			if (code < UPPER + 26)
-				return code - UPPER
-			if (code < LOWER + 26)
-				return code - LOWER + 26
-		}
+	  revLookup['-'.charCodeAt(0)] = 62
+	  revLookup['_'.charCodeAt(0)] = 63
+	}
 
-		function b64ToByteArray (b64) {
-			var i, j, l, tmp, placeHolders, arr
+	init()
 
-			if (b64.length % 4 > 0) {
-				throw new Error('Invalid string. Length must be a multiple of 4')
-			}
+	function toByteArray (b64) {
+	  var i, j, l, tmp, placeHolders, arr
+	  var len = b64.length
 
-			// the number of equal signs (place holders)
-			// if there are two placeholders, than the two characters before it
-			// represent one byte
-			// if there is only one, then the three characters before it represent 2 bytes
-			// this is just a cheap hack to not do indexOf twice
-			var len = b64.length
-			placeHolders = '=' === b64.charAt(len - 2) ? 2 : '=' === b64.charAt(len - 1) ? 1 : 0
+	  if (len % 4 > 0) {
+	    throw new Error('Invalid string. Length must be a multiple of 4')
+	  }
 
-			// base64 is 4/3 + up to two characters of the original data
-			arr = new Arr(b64.length * 3 / 4 - placeHolders)
+	  // the number of equal signs (place holders)
+	  // if there are two placeholders, than the two characters before it
+	  // represent one byte
+	  // if there is only one, then the three characters before it represent 2 bytes
+	  // this is just a cheap hack to not do indexOf twice
+	  placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
 
-			// if there are placeholders, only get up to the last complete 4 chars
-			l = placeHolders > 0 ? b64.length - 4 : b64.length
+	  // base64 is 4/3 + up to two characters of the original data
+	  arr = new Arr(len * 3 / 4 - placeHolders)
 
-			var L = 0
+	  // if there are placeholders, only get up to the last complete 4 chars
+	  l = placeHolders > 0 ? len - 4 : len
 
-			function push (v) {
-				arr[L++] = v
-			}
+	  var L = 0
 
-			for (i = 0, j = 0; i < l; i += 4, j += 3) {
-				tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
-				push((tmp & 0xFF0000) >> 16)
-				push((tmp & 0xFF00) >> 8)
-				push(tmp & 0xFF)
-			}
+	  for (i = 0, j = 0; i < l; i += 4, j += 3) {
+	    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
+	    arr[L++] = (tmp >> 16) & 0xFF
+	    arr[L++] = (tmp >> 8) & 0xFF
+	    arr[L++] = tmp & 0xFF
+	  }
 
-			if (placeHolders === 2) {
-				tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
-				push(tmp & 0xFF)
-			} else if (placeHolders === 1) {
-				tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
-				push((tmp >> 8) & 0xFF)
-				push(tmp & 0xFF)
-			}
+	  if (placeHolders === 2) {
+	    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
+	    arr[L++] = tmp & 0xFF
+	  } else if (placeHolders === 1) {
+	    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
+	    arr[L++] = (tmp >> 8) & 0xFF
+	    arr[L++] = tmp & 0xFF
+	  }
 
-			return arr
-		}
+	  return arr
+	}
 
-		function uint8ToBase64 (uint8) {
-			var i,
-				extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
-				output = "",
-				temp, length
+	function tripletToBase64 (num) {
+	  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
+	}
 
-			function encode (num) {
-				return lookup.charAt(num)
-			}
+	function encodeChunk (uint8, start, end) {
+	  var tmp
+	  var output = []
+	  for (var i = start; i < end; i += 3) {
+	    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
+	    output.push(tripletToBase64(tmp))
+	  }
+	  return output.join('')
+	}
 
-			function tripletToBase64 (num) {
-				return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
-			}
+	function fromByteArray (uint8) {
+	  var tmp
+	  var len = uint8.length
+	  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
+	  var output = ''
+	  var parts = []
+	  var maxChunkLength = 16383 // must be multiple of 3
 
-			// go through the array every three bytes, we'll deal with trailing stuff later
-			for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
-				temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
-				output += tripletToBase64(temp)
-			}
+	  // go through the array every three bytes, we'll deal with trailing stuff later
+	  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
+	    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
+	  }
 
-			// pad the end with zeros, but make sure to not forget the extra bytes
-			switch (extraBytes) {
-				case 1:
-					temp = uint8[uint8.length - 1]
-					output += encode(temp >> 2)
-					output += encode((temp << 4) & 0x3F)
-					output += '=='
-					break
-				case 2:
-					temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
-					output += encode(temp >> 10)
-					output += encode((temp >> 4) & 0x3F)
-					output += encode((temp << 2) & 0x3F)
-					output += '='
-					break
-			}
+	  // pad the end with zeros, but make sure to not forget the extra bytes
+	  if (extraBytes === 1) {
+	    tmp = uint8[len - 1]
+	    output += lookup[tmp >> 2]
+	    output += lookup[(tmp << 4) & 0x3F]
+	    output += '=='
+	  } else if (extraBytes === 2) {
+	    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
+	    output += lookup[tmp >> 10]
+	    output += lookup[(tmp >> 4) & 0x3F]
+	    output += lookup[(tmp << 2) & 0x3F]
+	    output += '='
+	  }
 
-			return output
-		}
+	  parts.push(output)
 
-		exports.toByteArray = b64ToByteArray
-		exports.fromByteArray = uint8ToBase64
-	}( false ? (this.base64js = {}) : exports))
+	  return parts.join('')
+	}
 
 
 /***/ },
-/* 33 */
+/* 57 */
 /***/ function(module, exports) {
 
 	exports.read = function (buffer, offset, isLE, mLen, nBytes) {
@@ -9045,7 +12756,7 @@
 
 
 /***/ },
-/* 34 */
+/* 58 */
 /***/ function(module, exports) {
 
 	var toString = {}.toString;
@@ -9056,7 +12767,7 @@
 
 
 /***/ },
-/* 35 */
+/* 59 */
 /***/ function(module, exports, __webpack_require__) {
 
 	/* WEBPACK VAR INJECTION */(function(Buffer) {// Copyright Joyent, Inc. and other Node contributors.
@@ -9167,16 +12878,16 @@
 	  return Object.prototype.toString.call(o);
 	}
 
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(31).Buffer))
+	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(55).Buffer))
 
 /***/ },
-/* 36 */
+/* 60 */
 /***/ function(module, exports) {
 
 	/* (ignored) */
 
 /***/ },
-/* 37 */
+/* 61 */
 /***/ function(module, exports, __webpack_require__) {
 
 	/* WEBPACK VAR INJECTION */(function(process) {// Copyright Joyent, Inc. and other Node contributors.
@@ -9217,12 +12928,12 @@
 
 
 	/*<replacement>*/
-	var util = __webpack_require__(35);
+	var util = __webpack_require__(59);
 	util.inherits = __webpack_require__(5);
 	/*</replacement>*/
 
-	var Readable = __webpack_require__(29);
-	var Writable = __webpack_require__(38);
+	var Readable = __webpack_require__(53);
+	var Writable = __webpack_require__(62);
 
 	util.inherits(Duplex, Readable);
 
@@ -9272,7 +12983,7 @@
 	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
 
 /***/ },
-/* 38 */
+/* 62 */
 /***/ function(module, exports, __webpack_require__) {
 
 	/* WEBPACK VAR INJECTION */(function(process) {// Copyright Joyent, Inc. and other Node contributors.
@@ -9303,18 +13014,18 @@
 	module.exports = Writable;
 
 	/*<replacement>*/
-	var Buffer = __webpack_require__(31).Buffer;
+	var Buffer = __webpack_require__(55).Buffer;
 	/*</replacement>*/
 
 	Writable.WritableState = WritableState;
 
 
 	/*<replacement>*/
-	var util = __webpack_require__(35);
+	var util = __webpack_require__(59);
 	util.inherits = __webpack_require__(5);
 	/*</replacement>*/
 
-	var Stream = __webpack_require__(27);
+	var Stream = __webpack_require__(51);
 
 	util.inherits(Writable, Stream);
 
@@ -9325,7 +13036,7 @@
 	}
 
 	function WritableState(options, stream) {
-	  var Duplex = __webpack_require__(37);
+	  var Duplex = __webpack_require__(61);
 
 	  options = options || {};
 
@@ -9413,7 +13124,7 @@
 	}
 
 	function Writable(options) {
-	  var Duplex = __webpack_require__(37);
+	  var Duplex = __webpack_require__(61);
 
 	  // Writable ctor is applied to Duplexes, though they're not
 	  // instanceof Writable, they're instanceof Readable.
@@ -9756,7 +13467,7 @@
 	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
 
 /***/ },
-/* 39 */
+/* 63 */
 /***/ function(module, exports, __webpack_require__) {
 
 	// Copyright Joyent, Inc. and other Node contributors.
@@ -9780,7 +13491,7 @@
 	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 	// USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-	var Buffer = __webpack_require__(31).Buffer;
+	var Buffer = __webpack_require__(55).Buffer;
 
 	var isBufferEncoding = Buffer.isEncoding
 	  || function(encoding) {
@@ -9983,7 +13694,7 @@
 
 
 /***/ },
-/* 40 */
+/* 64 */
 /***/ function(module, exports, __webpack_require__) {
 
 	// Copyright Joyent, Inc. and other Node contributors.
@@ -10052,10 +13763,10 @@
 
 	module.exports = Transform;
 
-	var Duplex = __webpack_require__(37);
+	var Duplex = __webpack_require__(61);
 
 	/*<replacement>*/
-	var util = __webpack_require__(35);
+	var util = __webpack_require__(59);
 	util.inherits = __webpack_require__(5);
 	/*</replacement>*/
 
@@ -10198,7 +13909,7 @@
 
 
 /***/ },
-/* 41 */
+/* 65 */
 /***/ function(module, exports, __webpack_require__) {
 
 	// Copyright Joyent, Inc. and other Node contributors.
@@ -10228,10 +13939,10 @@
 
 	module.exports = PassThrough;
 
-	var Transform = __webpack_require__(40);
+	var Transform = __webpack_require__(64);
 
 	/*<replacement>*/
-	var util = __webpack_require__(35);
+	var util = __webpack_require__(59);
 	util.inherits = __webpack_require__(5);
 	/*</replacement>*/
 
@@ -10250,41 +13961,41 @@
 
 
 /***/ },
-/* 42 */
+/* 66 */
 /***/ function(module, exports, __webpack_require__) {
 
-	module.exports = __webpack_require__(38)
+	module.exports = __webpack_require__(62)
 
 
 /***/ },
-/* 43 */
+/* 67 */
 /***/ function(module, exports, __webpack_require__) {
 
-	module.exports = __webpack_require__(37)
+	module.exports = __webpack_require__(61)
 
 
 /***/ },
-/* 44 */
+/* 68 */
 /***/ function(module, exports, __webpack_require__) {
 
-	module.exports = __webpack_require__(40)
+	module.exports = __webpack_require__(64)
 
 
 /***/ },
-/* 45 */
+/* 69 */
 /***/ function(module, exports, __webpack_require__) {
 
-	module.exports = __webpack_require__(41)
+	module.exports = __webpack_require__(65)
 
 
 /***/ },
-/* 46 */
+/* 70 */
 /***/ function(module, exports) {
 
 	/* (ignored) */
 
 /***/ },
-/* 47 */
+/* 71 */
 /***/ function(module, exports, __webpack_require__) {
 
 	module.exports = ProxyHandler;
@@ -10293,7 +14004,7 @@
 		this._cbs = cbs || {};
 	}
 
-	var EVENTS = __webpack_require__(12).EVENTS;
+	var EVENTS = __webpack_require__(36).EVENTS;
 	Object.keys(EVENTS).forEach(function(name){
 		if(EVENTS[name] === 0){
 			name = "on" + name;
@@ -10316,18 +14027,18 @@
 	});
 
 /***/ },
-/* 48 */
+/* 72 */
 /***/ function(module, exports, __webpack_require__) {
 
 	var DomUtils = module.exports;
 
 	[
-		__webpack_require__(49),
-		__webpack_require__(55),
-		__webpack_require__(56),
-		__webpack_require__(57),
-		__webpack_require__(58),
-		__webpack_require__(59)
+		__webpack_require__(73),
+		__webpack_require__(79),
+		__webpack_require__(80),
+		__webpack_require__(81),
+		__webpack_require__(82),
+		__webpack_require__(83)
 	].forEach(function(ext){
 		Object.keys(ext).forEach(function(key){
 			DomUtils[key] = ext[key].bind(DomUtils);
@@ -10336,11 +14047,11 @@
 
 
 /***/ },
-/* 49 */
+/* 73 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var ElementType = __webpack_require__(21),
-	    getOuterHTML = __webpack_require__(50),
+	var ElementType = __webpack_require__(45),
+	    getOuterHTML = __webpack_require__(74),
 	    isTag = ElementType.isTag;
 
 	module.exports = {
@@ -10364,14 +14075,14 @@
 
 
 /***/ },
-/* 50 */
+/* 74 */
 /***/ function(module, exports, __webpack_require__) {
 
 	/*
 	  Module dependencies
 	*/
-	var ElementType = __webpack_require__(51);
-	var entities = __webpack_require__(52);
+	var ElementType = __webpack_require__(75);
+	var entities = __webpack_require__(76);
 
 	/*
 	  Boolean Attributes
@@ -10548,7 +14259,7 @@
 
 
 /***/ },
-/* 51 */
+/* 75 */
 /***/ function(module, exports) {
 
 	//Types of elements found in the DOM
@@ -10567,11 +14278,11 @@
 	};
 
 /***/ },
-/* 52 */
+/* 76 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var encode = __webpack_require__(53),
-	    decode = __webpack_require__(54);
+	var encode = __webpack_require__(77),
+	    decode = __webpack_require__(78);
 
 	exports.decode = function(data, level){
 		return (!level || level <= 0 ? decode.XML : decode.HTML)(data);
@@ -10606,15 +14317,15 @@
 
 
 /***/ },
-/* 53 */
+/* 77 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var inverseXML = getInverseObj(__webpack_require__(19)),
+	var inverseXML = getInverseObj(__webpack_require__(43)),
 	    xmlReplacer = getInverseReplacer(inverseXML);
 
 	exports.XML = getInverse(inverseXML, xmlReplacer);
 
-	var inverseHTML = getInverseObj(__webpack_require__(17)),
+	var inverseHTML = getInverseObj(__webpack_require__(41)),
 	    htmlReplacer = getInverseReplacer(inverseHTML);
 
 	exports.HTML = getInverse(inverseHTML, htmlReplacer);
@@ -10685,13 +14396,13 @@
 
 
 /***/ },
-/* 54 */
+/* 78 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var entityMap = __webpack_require__(17),
-	    legacyMap = __webpack_require__(18),
-	    xmlMap    = __webpack_require__(19),
-	    decodeCodePoint = __webpack_require__(15);
+	var entityMap = __webpack_require__(41),
+	    legacyMap = __webpack_require__(42),
+	    xmlMap    = __webpack_require__(43),
+	    decodeCodePoint = __webpack_require__(39);
 
 	var decodeXMLStrict  = getStrictDecoder(xmlMap),
 	    decodeHTMLStrict = getStrictDecoder(entityMap);
@@ -10762,7 +14473,7 @@
 	};
 
 /***/ },
-/* 55 */
+/* 79 */
 /***/ function(module, exports) {
 
 	var getChildren = exports.getChildren = function(elem){
@@ -10792,7 +14503,7 @@
 
 
 /***/ },
-/* 56 */
+/* 80 */
 /***/ function(module, exports) {
 
 	exports.removeElement = function(elem){
@@ -10875,10 +14586,10 @@
 
 
 /***/ },
-/* 57 */
+/* 81 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var isTag = __webpack_require__(21).isTag;
+	var isTag = __webpack_require__(45).isTag;
 
 	module.exports = {
 		filter: filter,
@@ -10975,10 +14686,10 @@
 
 
 /***/ },
-/* 58 */
+/* 82 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var ElementType = __webpack_require__(21);
+	var ElementType = __webpack_require__(45);
 	var isTag = exports.isTag = ElementType.isTag;
 
 	exports.testElement = function(options, element){
@@ -11068,7 +14779,7 @@
 
 
 /***/ },
-/* 59 */
+/* 83 */
 /***/ function(module, exports) {
 
 	// removeSubsets
@@ -11215,7 +14926,7 @@
 
 
 /***/ },
-/* 60 */
+/* 84 */
 /***/ function(module, exports, __webpack_require__) {
 
 	module.exports = CollectingHandler;
@@ -11225,7 +14936,7 @@
 		this.events = [];
 	}
 
-	var EVENTS = __webpack_require__(12).EVENTS;
+	var EVENTS = __webpack_require__(36).EVENTS;
 	Object.keys(EVENTS).forEach(function(name){
 		if(EVENTS[name] === 0){
 			name = "on" + name;
@@ -11276,2391 +14987,1824 @@
 
 
 /***/ },
-/* 61 */
+/* 85 */
 /***/ function(module, exports, __webpack_require__) {
 
-	var EventEmitter = __webpack_require__(1);
-	var Sequencer = __webpack_require__(62);
-	var Thread = __webpack_require__(64);
-	var util = __webpack_require__(2);
-
-	// Virtual I/O devices.
-	var Clock = __webpack_require__(66);
-	var Mouse = __webpack_require__(67);
-
-	var defaultBlockPackages = {
-	    'scratch3_control': __webpack_require__(68),
-	    'scratch3_event': __webpack_require__(79),
-	    'scratch3_looks': __webpack_require__(80),
-	    'scratch3_motion': __webpack_require__(81),
-	    'scratch3_operators': __webpack_require__(82),
-	    'scratch3_sensing': __webpack_require__(84)
-	};
+	var Clone = __webpack_require__(86);
+	var Blocks = __webpack_require__(34);
 
 	/**
-	 * Manages targets, scripts, and the sequencer.
-	 * @param {!Array.<Target>} targets List of targets for this runtime.
-	 */
-	function Runtime (targets) {
-	    // Bind event emitter
-	    EventEmitter.call(this);
-
-	    // State for the runtime
-
-	    /**
-	     * Target management and storage.
-	     */
-	    this.targets = targets;
-
-	    /**
-	     * A list of threads that are currently running in the VM.
-	     * Threads are added when execution starts and pruned when execution ends.
-	     * @type {Array.<Thread>}
-	     */
-	    this.threads = [];
-
-	    /** @type {!Sequencer} */
-	    this.sequencer = new Sequencer(this);
-
-	    /**
-	     * Map to look up a block primitive's implementation function by its opcode.
-	     * This is a two-step lookup: package name first, then primitive name.
-	     * @type {Object.<string, Function>}
-	     */
-	    this._primitives = {};
-	    this._registerBlockPackages();
-
-	    this.ioDevices = {
-	        'clock': new Clock(),
-	        'mouse': new Mouse()
-	    };
-	}
-
-	/**
-	 * Event name for glowing a stack
-	 * @const {string}
-	 */
-	Runtime.STACK_GLOW_ON = 'STACK_GLOW_ON';
-
-	/**
-	 * Event name for unglowing a stack
-	 * @const {string}
-	 */
-	Runtime.STACK_GLOW_OFF = 'STACK_GLOW_OFF';
-
-	/**
-	 * Event name for glowing a block
-	 * @const {string}
-	 */
-	Runtime.BLOCK_GLOW_ON = 'BLOCK_GLOW_ON';
-
-	/**
-	 * Event name for unglowing a block
-	 * @const {string}
-	 */
-	Runtime.BLOCK_GLOW_OFF = 'BLOCK_GLOW_OFF';
-
-	/**
-	 * Event name for visual value report.
-	 * @const {string}
-	 */
-	Runtime.VISUAL_REPORT = 'VISUAL_REPORT';
-
-	/**
-	 * Inherit from EventEmitter
-	 */
-	util.inherits(Runtime, EventEmitter);
-
-	/**
-	 * How rapidly we try to step threads, in ms.
-	 */
-	Runtime.THREAD_STEP_INTERVAL = 1000 / 60;
-
-
-	// -----------------------------------------------------------------------------
-	// -----------------------------------------------------------------------------
-
-	/**
-	 * Register default block packages with this runtime.
-	 * @todo Prefix opcodes with package name.
-	 * @private
-	 */
-	Runtime.prototype._registerBlockPackages = function () {
-	    for (var packageName in defaultBlockPackages) {
-	        if (defaultBlockPackages.hasOwnProperty(packageName)) {
-	            // @todo pass a different runtime depending on package privilege?
-	            var packageObject = new (defaultBlockPackages[packageName])(this);
-	            var packageContents = packageObject.getPrimitives();
-	            for (var op in packageContents) {
-	                if (packageContents.hasOwnProperty(op)) {
-	                    this._primitives[op] =
-	                        packageContents[op].bind(packageObject);
-	                }
-	            }
-	        }
-	    }
-	};
-
-	/**
-	 * Retrieve the function associated with the given opcode.
-	 * @param {!string} opcode The opcode to look up.
-	 * @return {Function} The function which implements the opcode.
-	 */
-	Runtime.prototype.getOpcodeFunction = function (opcode) {
-	    return this._primitives[opcode];
-	};
-
-	// -----------------------------------------------------------------------------
-	// -----------------------------------------------------------------------------
-
-	/**
-	 * Create a thread and push it to the list of threads.
-	 * @param {!string} id ID of block that starts the stack
-	 */
-	Runtime.prototype._pushThread = function (id) {
-	    this.emit(Runtime.STACK_GLOW_ON, id);
-	    var thread = new Thread(id);
-	    thread.pushStack(id);
-	    this.threads.push(thread);
-	};
-
-	/**
-	 * Remove a thread from the list of threads.
-	 * @param {?Thread} thread Thread object to remove from actives
-	 */
-	Runtime.prototype._removeThread = function (thread) {
-	    var i = this.threads.indexOf(thread);
-	    if (i > -1) {
-	        this.emit(Runtime.STACK_GLOW_OFF, thread.topBlock);
-	        this.threads.splice(i, 1);
-	    }
-	};
-
-	/**
-	 * Toggle a script.
-	 * @param {!string} topBlockId ID of block that starts the script.
-	 */
-	Runtime.prototype.toggleScript = function (topBlockId) {
-	    // Remove any existing thread.
-	    for (var i = 0; i < this.threads.length; i++) {
-	        if (this.threads[i].topBlock == topBlockId) {
-	            this._removeThread(this.threads[i]);
-	            return;
-	        }
-	    }
-	    // Otherwise add it.
-	    this._pushThread(topBlockId);
-	};
-
-	/**
-	 * Green flag, which stops currently running threads
-	 * and adds all top-level scripts that start with the green flag
-	 */
-	Runtime.prototype.greenFlag = function () {
-	    // Remove all existing threads
-	    for (var i = 0; i < this.threads.length; i++) {
-	        this._removeThread(this.threads[i]);
-	    }
-	    // Add all top scripts with green flag
-	    for (var t = 0; t < this.targets.length; t++) {
-	        var target = this.targets[t];
-	        var scripts = target.blocks.getScripts();
-	        for (var j = 0; j < scripts.length; j++) {
-	            var topBlock = scripts[j];
-	            if (target.blocks.getBlock(topBlock).opcode ===
-	                'event_whenflagclicked') {
-	                this._pushThread(scripts[j]);
-	            }
-	        }
-	    }
-	};
-
-	/**
-	 * Stop "everything"
-	 */
-	Runtime.prototype.stopAll = function () {
-	    var threadsCopy = this.threads.slice();
-	    while (threadsCopy.length > 0) {
-	        var poppedThread = threadsCopy.pop();
-	        // Unglow any blocks on this thread's stack.
-	        for (var i = 0; i < poppedThread.stack.length; i++) {
-	            this.glowBlock(poppedThread.stack[i], false);
-	        }
-	        // Actually remove the thread.
-	        this._removeThread(poppedThread);
-	    }
-	};
-
-	/**
-	 * Repeatedly run `sequencer.stepThreads` and filter out
-	 * inactive threads after each iteration.
-	 */
-	Runtime.prototype._step = function () {
-	    var inactiveThreads = this.sequencer.stepThreads(this.threads);
-	    for (var i = 0; i < inactiveThreads.length; i++) {
-	        this._removeThread(inactiveThreads[i]);
-	    }
-	};
-
-	/**
-	 * Emit feedback for block glowing (used in the sequencer).
-	 * @param {?string} blockId ID for the block to update glow
-	 * @param {boolean} isGlowing True to turn on glow; false to turn off.
-	 */
-	Runtime.prototype.glowBlock = function (blockId, isGlowing) {
-	    if (isGlowing) {
-	        this.emit(Runtime.BLOCK_GLOW_ON, blockId);
-	    } else {
-	        this.emit(Runtime.BLOCK_GLOW_OFF, blockId);
-	    }
-	};
-
-	/**
-	 * Emit value for reporter to show in the blocks.
-	 * @param {string} blockId ID for the block.
-	 * @param {string} value Value to show associated with the block.
-	 */
-	Runtime.prototype.visualReport = function (blockId, value) {
-	    this.emit(Runtime.VISUAL_REPORT, blockId, String(value));
-	};
-
-	/**
-	 * Return the Target for a particular thread.
-	 * @param {!Thread} thread Thread to determine target for.
-	 * @return {?Target} Target object, if one exists.
-	 */
-	Runtime.prototype.targetForThread = function (thread) {
-	    // @todo This is a messy solution,
-	    // but prevents having circular data references.
-	    // Have a map or some other way to associate target with threads.
-	    for (var t = 0; t < this.targets.length; t++) {
-	        var target = this.targets[t];
-	        if (target.blocks.getBlock(thread.topBlock)) {
-	            return target;
-	        }
-	    }
-	};
-
-	/**
-	 * Handle an animation frame from the main thread.
-	 */
-	Runtime.prototype.animationFrame = function () {
-	    if (self.renderer) {
-	        self.renderer.draw();
-	    }
-	};
-
-	/**
-	 * Set up timers to repeatedly step in a browser
-	 */
-	Runtime.prototype.start = function () {
-	    self.setInterval(function() {
-	        this._step();
-	    }.bind(this), Runtime.THREAD_STEP_INTERVAL);
-	};
-
-	module.exports = Runtime;
-
-
-/***/ },
-/* 62 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Timer = __webpack_require__(63);
-	var Thread = __webpack_require__(64);
-	var execute = __webpack_require__(65);
-
-	function Sequencer (runtime) {
-	    /**
-	     * A utility timer for timing thread sequencing.
-	     * @type {!Timer}
-	     */
-	    this.timer = new Timer();
-
-	    /**
-	     * Reference to the runtime owning this sequencer.
-	     * @type {!Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
-	/**
-	 * The sequencer does as much work as it can within WORK_TIME milliseconds,
-	 * then yields. This is essentially a rate-limiter for blocks.
-	 * In Scratch 2.0, this is set to 75% of the target stage frame-rate (30fps).
-	 * @const {!number}
-	 */
-	Sequencer.WORK_TIME = 10;
-
-	/**
-	 * Step through all threads in `this.threads`, running them in order.
-	 * @param {Array.<Thread>} threads List of which threads to step.
-	 * @return {Array.<Thread>} All threads which have finished in this iteration.
-	 */
-	Sequencer.prototype.stepThreads = function (threads) {
-	    // Start counting toward WORK_TIME
-	    this.timer.start();
-	    // List of threads which have been killed by this step.
-	    var inactiveThreads = [];
-	    // If all of the threads are yielding, we should yield.
-	    var numYieldingThreads = 0;
-	    // Clear all yield statuses that were for the previous frame.
-	    for (var t = 0; t < threads.length; t++) {
-	        if (threads[t].status === Thread.STATUS_YIELD_FRAME) {
-	            threads[t].setStatus(Thread.STATUS_RUNNING);
-	        }
-	    }
-
-	    // While there are still threads to run and we are within WORK_TIME,
-	    // continue executing threads.
-	    while (threads.length > 0 &&
-	           threads.length > numYieldingThreads &&
-	           this.timer.timeElapsed() < Sequencer.WORK_TIME) {
-	        // New threads at the end of the iteration.
-	        var newThreads = [];
-	        // Reset yielding thread count.
-	        numYieldingThreads = 0;
-	        // Attempt to run each thread one time
-	        for (var i = 0; i < threads.length; i++) {
-	            var activeThread = threads[i];
-	            if (activeThread.status === Thread.STATUS_RUNNING) {
-	                // Normal-mode thread: step.
-	                this.startThread(activeThread);
-	            } else if (activeThread.status === Thread.STATUS_YIELD ||
-	                       activeThread.status === Thread.STATUS_YIELD_FRAME) {
-	                // Yielding thread: do nothing for this step.
-	                numYieldingThreads++;
-	            }
-	            if (activeThread.stack.length === 0 &&
-	                activeThread.status === Thread.STATUS_DONE) {
-	                // Finished with this thread - tell runtime to clean it up.
-	                inactiveThreads.push(activeThread);
-	            } else {
-	                // Keep this thead in the loop.
-	                newThreads.push(activeThread);
-	            }
-	        }
-	        // Effectively filters out threads that have stopped.
-	        threads = newThreads;
-	    }
-	    return inactiveThreads;
-	};
-
-	/**
-	 * Step the requested thread
-	 * @param {!Thread} thread Thread object to step
-	 */
-	Sequencer.prototype.startThread = function (thread) {
-	    var currentBlockId = thread.peekStack();
-	    if (!currentBlockId) {
-	        // A "null block" - empty branch.
-	        // Yield for the frame.
-	        thread.popStack();
-	        thread.setStatus(Thread.STATUS_YIELD_FRAME);
-	        return;
-	    }
-	    // Execute the current block
-	    execute(this, thread);
-	    // If the block executed without yielding and without doing control flow,
-	    // move to done.
-	    if (thread.status === Thread.STATUS_RUNNING &&
-	        thread.peekStack() === currentBlockId) {
-	        this.proceedThread(thread);
-	    }
-	};
-
-	/**
-	 * Step a thread into a block's branch.
-	 * @param {!Thread} thread Thread object to step to branch.
-	 * @param {Number} branchNum Which branch to step to (i.e., 1, 2).
-	 */
-	Sequencer.prototype.stepToBranch = function (thread, branchNum) {
-	    if (!branchNum) {
-	        branchNum = 1;
-	    }
-	    var currentBlockId = thread.peekStack();
-	    var branchId = this.runtime.targetForThread(thread).blocks.getBranch(
-	        currentBlockId,
-	        branchNum
-	    );
-	    if (branchId) {
-	        // Push branch ID to the thread's stack.
-	        thread.pushStack(branchId);
-	    } else {
-	        // Push null, so we come back to the current block.
-	        thread.pushStack(null);
-	    }
-	};
-
-	/**
-	 * Step a thread into an input reporter, and manage its status appropriately.
-	 * @param {!Thread} thread Thread object to step to reporter.
-	 * @param {!string} blockId ID of reporter block.
-	 * @param {!string} inputName Name of input on parent block.
-	 * @return {boolean} True if yielded, false if it finished immediately.
-	 */
-	Sequencer.prototype.stepToReporter = function (thread, blockId, inputName) {
-	    var currentStackFrame = thread.peekStackFrame();
-	    // Push to the stack to evaluate the reporter block.
-	    thread.pushStack(blockId);
-	    // Save name of input for `Thread.pushReportedValue`.
-	    currentStackFrame.waitingReporter = inputName;
-	    // Actually execute the block.
-	    this.startThread(thread);
-	    // If a reporter yielded, caller must wait for it to unyield.
-	    // The value will be populated once the reporter unyields,
-	    // and passed up to the currentStackFrame on next execution.
-	    return thread.status === Thread.STATUS_YIELD;
-	};
-
-	/**
-	 * Finish stepping a thread and proceed it to the next block.
-	 * @param {!Thread} thread Thread object to proceed.
-	 */
-	Sequencer.prototype.proceedThread = function (thread) {
-	    var currentBlockId = thread.peekStack();
-	    // Mark the status as done and proceed to the next block.
-	    // Pop from the stack - finished this level of execution.
-	    thread.popStack();
-	    // Push next connected block, if there is one.
-	    var nextBlockId = (this.runtime.targetForThread(thread).
-	        blocks.getNextBlock(currentBlockId));
-	    if (nextBlockId) {
-	        thread.pushStack(nextBlockId);
-	    }
-	    // If we can't find a next block to run, mark the thread as done.
-	    if (!thread.peekStack()) {
-	        thread.setStatus(Thread.STATUS_DONE);
-	    }
-	};
-
-	module.exports = Sequencer;
-
-
-/***/ },
-/* 63 */
-/***/ function(module, exports) {
-
-	/**
-	 * Constructor
-	 */
-	function Timer () {
-	    this.startTime = 0;
-	}
-
-	Timer.prototype.time = function () {
-	    return Date.now();
-	};
-
-	Timer.prototype.start = function () {
-	    this.startTime = this.time();
-	};
-
-	Timer.prototype.timeElapsed = function () {
-	    return this.time() - this.startTime;
-	};
-
-	module.exports = Timer;
-
-
-/***/ },
-/* 64 */
-/***/ function(module, exports) {
-
-	/**
-	 * A thread is a running stack context and all the metadata needed.
-	 * @param {?string} firstBlock First block to execute in the thread.
+	 * Sprite to be used on the Scratch stage.
+	 * All clones of a sprite have shared blocks, shared costumes, shared variables.
+	 * @param {?Blocks} blocks Shared blocks object for all clones of sprite.
 	 * @constructor
 	 */
-	function Thread (firstBlock) {
+	function Sprite (blocks) {
+	    if (!blocks) {
+	        // Shared set of blocks for all clones.
+	        blocks = new Blocks();
+	    }
+	    this.blocks = blocks;
 	    /**
-	     * ID of top block of the thread
-	     * @type {!string}
+	     * Human-readable name for this sprite (and all clones).
+	     * @type {string}
 	     */
-	    this.topBlock = firstBlock;
-
+	    this.name = '';
 	    /**
-	     * Stack for the thread. When the sequencer enters a control structure,
-	     * the block is pushed onto the stack so we know where to exit.
-	     * @type {Array.<string>}
+	     * List of costumes for this sprite.
+	     * Each entry is an object, e.g.,
+	     * {
+	     *      skin: "costume.svg",
+	     *      name: "Costume Name",
+	     *      bitmapResolution: 2,
+	     *      rotationCenterX: 0,
+	     *      rotationCenterY: 0
+	     * }
+	     * @type {Array.<!Object>}
 	     */
-	    this.stack = [];
-
+	    this.costumes = [];
 	    /**
-	     * Stack frames for the thread. Store metadata for the executing blocks.
-	     * @type {Array.<Object>}
+	     * List of clones for this sprite, including the original.
+	     * @type {Array.<!Clone>}
 	     */
-	    this.stackFrames = [];
-
-	    /**
-	     * Status of the thread, one of three states (below)
-	     * @type {number}
-	     */
-	    this.status = 0; /* Thread.STATUS_RUNNING */
+	    this.clones = [];
 	}
 
 	/**
-	 * Thread status for initialized or running thread.
-	 * This is the default state for a thread - execution should run normally,
-	 * stepping from block to block.
-	 * @const
+	 * Create a clone of this sprite.
+	 * @returns {!Clone} Newly created clone.
 	 */
-	Thread.STATUS_RUNNING = 0;
+	Sprite.prototype.createClone = function () {
+	    var newClone = new Clone(this);
+	    this.clones.push(newClone);
+	    return newClone;
+	};
+
+	module.exports = Sprite;
+
+
+/***/ },
+/* 86 */
+/***/ function(module, exports, __webpack_require__) {
+
+	var util = __webpack_require__(2);
+	var MathUtil = __webpack_require__(16);
+	var Target = __webpack_require__(87);
 
 	/**
-	 * Thread status for a yielded thread.
-	 * Threads are in this state when a primitive has yielded; execution is paused
-	 * until the relevant primitive unyields.
-	 * @const
+	 * Clone (instance) of a sprite.
+	 * @param {!Sprite} sprite Reference to the sprite.
+	 * @constructor
 	 */
-	Thread.STATUS_YIELD = 1;
+	function Clone(sprite) {
+	    Target.call(this, sprite.blocks);
+	    /**
+	     * Reference to the sprite that this is a clone of.
+	     * @type {!Sprite}
+	     */
+	    this.sprite = sprite;
+	    /**
+	     * Reference to the global renderer for this VM, if one exists.
+	     * @type {?RenderWebGLWorker}
+	     */
+	    this.renderer = null;
+	    // If this is not true, there is no renderer (e.g., running in a test env).
+	    if (typeof self !== 'undefined' && self.renderer) {
+	        // Pull from `self.renderer`.
+	        this.renderer = self.renderer;
+	    }
+	    /**
+	     * ID of the drawable for this clone returned by the renderer, if rendered.
+	     * @type {?Number}
+	     */
+	    this.drawableID = null;
+
+	    this.initDrawable();
+	}
+	util.inherits(Clone, Target);
 
 	/**
-	 * Thread status for a single-frame yield.
-	 * @const
+	 * Create a clone's drawable with the this.renderer.
 	 */
-	Thread.STATUS_YIELD_FRAME = 2;
-
-	/**
-	 * Thread status for a finished/done thread.
-	 * Thread is in this state when there are no more blocks to execute.
-	 * @const
-	 */
-	Thread.STATUS_DONE = 3;
-
-	/**
-	 * Push stack and update stack frames appropriately.
-	 * @param {string} blockId Block ID to push to stack.
-	 */
-	Thread.prototype.pushStack = function (blockId) {
-	    this.stack.push(blockId);
-	    // Push an empty stack frame, if we need one.
-	    // Might not, if we just popped the stack.
-	    if (this.stack.length > this.stackFrames.length) {
-	        this.stackFrames.push({
-	            reported: {}, // Collects reported input values.
-	            waitingReporter: null, // Name of waiting reporter.
-	            executionContext: {} // A context passed to block implementations.
+	Clone.prototype.initDrawable = function () {
+	    if (this.renderer) {
+	        var createPromise = this.renderer.createDrawable();
+	        var instance = this;
+	        createPromise.then(function (id) {
+	            instance.drawableID = id;
+	            // Once the drawable is created, send our current set of properties.
+	            instance.updateAllDrawableProperties();
 	        });
 	    }
 	};
 
+	// Clone-level properties.
 	/**
-	 * Pop last block on the stack and its stack frame.
-	 * @return {string} Block ID popped from the stack.
+	 * Whether this clone represents the Scratch stage.
+	 * @type {boolean}
 	 */
-	Thread.prototype.popStack = function () {
-	    this.stackFrames.pop();
-	    return this.stack.pop();
+	Clone.prototype.isStage = false;
+
+	/**
+	 * Scratch X coordinate. Currently should range from -240 to 240.
+	 * @type {Number}
+	 */
+	Clone.prototype.x = 0;
+
+	/**
+	 * Scratch Y coordinate. Currently should range from -180 to 180.
+	 * @type {number}
+	 */
+	Clone.prototype.y = 0;
+
+	/**
+	 * Scratch direction. Currently should range from -179 to 180.
+	 * @type {number}
+	 */
+	Clone.prototype.direction = 90;
+
+	/**
+	 * Whether the clone is currently visible.
+	 * @type {boolean}
+	 */
+	Clone.prototype.visible = true;
+
+	/**
+	 * Size of clone as a percent of costume size. Ranges from 5% to 535%.
+	 * @type {number}
+	 */
+	Clone.prototype.size = 100;
+
+	/**
+	 * Currently selected costume index.
+	 * @type {number}
+	 */
+	Clone.prototype.currentCostume = 0;
+
+	/**
+	 * Map of current graphic effect values.
+	 * @type {!Object.<string, number>}
+	 */
+	Clone.prototype.effects = {
+	    'color': 0,
+	    'fisheye': 0,
+	    'whirl': 0,
+	    'pixelate': 0,
+	    'mosaic': 0,
+	    'brightness': 0,
+	    'ghost': 0
 	};
+	// End clone-level properties.
 
 	/**
-	 * Get top stack item.
-	 * @return {?string} Block ID on top of stack.
+	 * Set the X and Y coordinates of a clone.
+	 * @param {!number} x New X coordinate of clone, in Scratch coordinates.
+	 * @param {!number} y New Y coordinate of clone, in Scratch coordinates.
 	 */
-	Thread.prototype.peekStack = function () {
-	    return this.stack[this.stack.length - 1];
-	};
-
-
-	/**
-	 * Get top stack frame.
-	 * @return {?Object} Last stack frame stored on this thread.
-	 */
-	Thread.prototype.peekStackFrame = function () {
-	    return this.stackFrames[this.stackFrames.length - 1];
-	};
-
-	/**
-	 * Get stack frame above the current top.
-	 * @return {?Object} Second to last stack frame stored on this thread.
-	 */
-	Thread.prototype.peekParentStackFrame = function () {
-	    return this.stackFrames[this.stackFrames.length - 2];
-	};
-
-	/**
-	 * Push a reported value to the parent of the current stack frame.
-	 * @param {!Any} value Reported value to push.
-	 */
-	Thread.prototype.pushReportedValue = function (value) {
-	    var parentStackFrame = this.peekParentStackFrame();
-	    if (parentStackFrame) {
-	        var waitingReporter = parentStackFrame.waitingReporter;
-	        parentStackFrame.reported[waitingReporter] = value;
-	        parentStackFrame.waitingReporter = null;
-	    }
-	};
-
-	/**
-	 * Set thread status.
-	 * @param {number} status Enum representing thread status.
-	 */
-	Thread.prototype.setStatus = function (status) {
-	    this.status = status;
-	};
-
-	module.exports = Thread;
-
-
-/***/ },
-/* 65 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Thread = __webpack_require__(64);
-
-	/**
-	 * Execute a block.
-	 * @param {!Sequencer} sequencer Which sequencer is executing.
-	 * @param {!Thread} thread Thread which to read and execute.
-	 */
-	var execute = function (sequencer, thread) {
-	    var runtime = sequencer.runtime;
-	    var target = runtime.targetForThread(thread);
-
-	    // Current block to execute is the one on the top of the stack.
-	    var currentBlockId = thread.peekStack();
-	    var currentStackFrame = thread.peekStackFrame();
-
-	    var opcode = target.blocks.getOpcode(currentBlockId);
-
-	    if (!opcode) {
-	        console.warn('Could not get opcode for block: ' + currentBlockId);
+	Clone.prototype.setXY = function (x, y) {
+	    if (this.isStage) {
 	        return;
 	    }
+	    this.x = x;
+	    this.y = y;
+	    if (this.renderer) {
+	        this.renderer.updateDrawableProperties(this.drawableID, {
+	            position: [this.x, this.y]
+	        });
+	    }
+	};
 
-	    var blockFunction = runtime.getOpcodeFunction(opcode);
-	    if (!blockFunction) {
-	        console.warn('Could not get implementation for opcode: ' + opcode);
+	/**
+	 * Set the direction of a clone.
+	 * @param {!number} direction New direction of clone.
+	 */
+	Clone.prototype.setDirection = function (direction) {
+	    if (this.isStage) {
 	        return;
 	    }
-
-	    // Generate values for arguments (inputs).
-	    var argValues = {};
-
-	    // Add all fields on this block to the argValues.
-	    var fields = target.blocks.getFields(currentBlockId);
-	    for (var fieldName in fields) {
-	        argValues[fieldName] = fields[fieldName].value;
-	    }
-
-	    // Recursively evaluate input blocks.
-	    var inputs = target.blocks.getInputs(currentBlockId);
-	    for (var inputName in inputs) {
-	        var input = inputs[inputName];
-	        var inputBlockId = input.block;
-	        // Is there no value for this input waiting in the stack frame?
-	        if (typeof currentStackFrame.reported[inputName] === 'undefined') {
-	            // If there's not, we need to evaluate the block.
-	            var reporterYielded = (
-	                sequencer.stepToReporter(thread, inputBlockId, inputName)
-	            );
-	            // If the reporter yielded, return immediately;
-	            // it needs time to finish and report its value.
-	            if (reporterYielded) {
-	                return;
-	            }
-	        }
-	        argValues[inputName] = currentStackFrame.reported[inputName];
-	    }
-
-	    // If we've gotten this far, all of the input blocks are evaluated,
-	    // and `argValues` is fully populated. So, execute the block primitive.
-	    // First, clear `currentStackFrame.reported`, so any subsequent execution
-	    // (e.g., on return from a branch) gets fresh inputs.
-	    currentStackFrame.reported = {};
-
-	    var primitiveReportedValue = null;
-	    primitiveReportedValue = blockFunction(argValues, {
-	        yield: function() {
-	            thread.setStatus(Thread.STATUS_YIELD);
-	        },
-	        yieldFrame: function() {
-	            thread.setStatus(Thread.STATUS_YIELD_FRAME);
-	        },
-	        done: function() {
-	            thread.setStatus(Thread.STATUS_RUNNING);
-	            sequencer.proceedThread(thread);
-	        },
-	        stackFrame: currentStackFrame.executionContext,
-	        startBranch: function (branchNum) {
-	            sequencer.stepToBranch(thread, branchNum);
-	        },
-	        target: target,
-	        ioQuery: function (device, func, args) {
-	            // Find the I/O device and execute the query/function call.
-	            if (runtime.ioDevices[device] && runtime.ioDevices[device][func]) {
-	                var devObject = runtime.ioDevices[device];
-	                return devObject[func].call(devObject, args);
-	            }
-	        }
-	    });
-
-	    // Deal with any reported value.
-	    // If it's a promise, wait until promise resolves.
-	    var isPromise = (
-	        primitiveReportedValue &&
-	        primitiveReportedValue.then &&
-	        typeof primitiveReportedValue.then === 'function'
-	    );
-	    if (isPromise) {
-	        if (thread.status === Thread.STATUS_RUNNING) {
-	            // Primitive returned a promise; automatically yield thread.
-	            thread.setStatus(Thread.STATUS_YIELD);
-	        }
-	        // Promise handlers
-	        primitiveReportedValue.then(function(resolvedValue) {
-	            // Promise resolved: the primitive reported a value.
-	            thread.pushReportedValue(resolvedValue);
-	            // Report the value visually if necessary.
-	            if (typeof resolvedValue !== 'undefined' &&
-	                thread.peekStack() === thread.topBlock) {
-	                runtime.visualReport(thread.peekStack(), resolvedValue);
-	            }
-	            thread.setStatus(Thread.STATUS_RUNNING);
-	            sequencer.proceedThread(thread);
-	        }, function(rejectionReason) {
-	            // Promise rejected: the primitive had some error.
-	            // Log it and proceed.
-	            console.warn('Primitive rejected promise: ', rejectionReason);
-	            thread.setStatus(Thread.STATUS_RUNNING);
-	            sequencer.proceedThread(thread);
+	    // Keep direction between -179 and +180.
+	    this.direction = MathUtil.wrapClamp(direction, -179, 180);
+	    if (this.renderer) {
+	        this.renderer.updateDrawableProperties(this.drawableID, {
+	            direction: this.direction
 	        });
-	    } else if (thread.status === Thread.STATUS_RUNNING) {
-	        thread.pushReportedValue(primitiveReportedValue);
-	        // Report the value visually if necessary.
-	        if (typeof primitiveReportedValue !== 'undefined' &&
-	            thread.peekStack() === thread.topBlock) {
-	            runtime.visualReport(thread.peekStack(), primitiveReportedValue);
-	        }
 	    }
 	};
 
-	module.exports = execute;
-
-
-/***/ },
-/* 66 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Timer = __webpack_require__(63);
-
-	function Clock () {
-	    this._projectTimer = new Timer();
-	    this._projectTimer.start();
-	}
-
-	Clock.prototype.projectTimer = function () {
-	    return this._projectTimer.timeElapsed() / 1000;
-	};
-
-	Clock.prototype.resetProjectTimer = function () {
-	    this._projectTimer.start();
-	};
-
-	module.exports = Clock;
-
-
-/***/ },
-/* 67 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var MathUtil = __webpack_require__(8);
-
-	function Mouse () {
-	    this._x = 0;
-	    this._y = 0;
-	    this._isDown = false;
-	}
-
-	Mouse.prototype.postData = function(data) {
-	    if (data.x) {
-	        this._x = data.x;
-	    }
-	    if (data.y) {
-	        this._y = data.y;
-	    }
-	    if (typeof data.isDown !== 'undefined') {
-	        this._isDown = data.isDown;
-	    }
-	};
-
-	Mouse.prototype.getX = function () {
-	    return MathUtil.clamp(this._x, -240, 240);
-	};
-
-	Mouse.prototype.getY = function () {
-	    return MathUtil.clamp(-this._y, -180, 180);
-	};
-
-	Mouse.prototype.getIsDown = function () {
-	    return this._isDown;
-	};
-
-	module.exports = Mouse;
-
-
-/***/ },
-/* 68 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Promise = __webpack_require__(69);
-
-	function Scratch3ControlBlocks(runtime) {
-	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
 	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 * Set a say bubble on this clone.
+	 * @param {?string} type Type of say bubble: "say", "think", or null.
+	 * @param {?string} message Message to put in say bubble.
 	 */
-	Scratch3ControlBlocks.prototype.getPrimitives = function() {
-	    return {
-	        'control_repeat': this.repeat,
-	        'control_repeat_until': this.repeatUntil,
-	        'control_forever': this.forever,
-	        'control_wait': this.wait,
-	        'control_if': this.if,
-	        'control_if_else': this.ifElse,
-	        'control_stop': this.stop
-	    };
+	Clone.prototype.setSay = function (type, message) {
+	    if (this.isStage) {
+	        return;
+	    }
+	    // @todo: Render to stage.
+	    if (!type || !message) {
+	        console.log('Clearing say bubble');
+	        return;
+	    }
+	    console.log('Setting say bubble:', type, message);
 	};
 
-	Scratch3ControlBlocks.prototype.repeat = function(args, util) {
-	    // Initialize loop
-	    if (util.stackFrame.loopCounter === undefined) {
-	        util.stackFrame.loopCounter = parseInt(args.TIMES);
-	    }
-	    // Only execute once per frame.
-	    // When the branch finishes, `repeat` will be executed again and
-	    // the second branch will be taken, yielding for the rest of the frame.
-	    if (!util.stackFrame.executedInFrame) {
-	        util.stackFrame.executedInFrame = true;
-	        // Decrease counter
-	        util.stackFrame.loopCounter--;
-	        // If we still have some left, start the branch.
-	        if (util.stackFrame.loopCounter >= 0) {
-	            util.startBranch();
-	        }
-	    } else {
-	        util.stackFrame.executedInFrame = false;
-	        util.yieldFrame();
-	    }
-	};
-
-	Scratch3ControlBlocks.prototype.repeatUntil = function(args, util) {
-	    // Only execute once per frame.
-	    // When the branch finishes, `repeat` will be executed again and
-	    // the second branch will be taken, yielding for the rest of the frame.
-	    if (!util.stackFrame.executedInFrame) {
-	        util.stackFrame.executedInFrame = true;
-	        // If the condition is true, start the branch.
-	        if (!args.CONDITION) {
-	            util.startBranch();
-	        }
-	    } else {
-	        util.stackFrame.executedInFrame = false;
-	        util.yieldFrame();
-	    }
-	};
-
-	Scratch3ControlBlocks.prototype.forever = function(args, util) {
-	    // Only execute once per frame.
-	    // When the branch finishes, `forever` will be executed again and
-	    // the second branch will be taken, yielding for the rest of the frame.
-	    if (!util.stackFrame.executedInFrame) {
-	        util.stackFrame.executedInFrame = true;
-	        util.startBranch();
-	    } else {
-	        util.stackFrame.executedInFrame = false;
-	        util.yieldFrame();
-	    }
-	};
-
-	Scratch3ControlBlocks.prototype.wait = function(args) {
-	    return new Promise(function(resolve) {
-	        setTimeout(function() {
-	            resolve();
-	        }, 1000 * args.DURATION);
-	    });
-	};
-
-	Scratch3ControlBlocks.prototype.if = function(args, util) {
-	    // Only execute one time. `if` will be returned to
-	    // when the branch finishes, but it shouldn't execute again.
-	    if (util.stackFrame.executedInFrame === undefined) {
-	        util.stackFrame.executedInFrame = true;
-	        if (args.CONDITION) {
-	            util.startBranch();
-	        }
-	    }
-	};
-
-	Scratch3ControlBlocks.prototype.ifElse = function(args, util) {
-	    // Only execute one time. `ifElse` will be returned to
-	    // when the branch finishes, but it shouldn't execute again.
-	    if (util.stackFrame.executedInFrame === undefined) {
-	        util.stackFrame.executedInFrame = true;
-	        if (args.CONDITION) {
-	            util.startBranch(1);
-	        } else {
-	            util.startBranch(2);
-	        }
-	    }
-	};
-
-	Scratch3ControlBlocks.prototype.stop = function() {
-	    // @todo - don't use this.runtime
-	    this.runtime.stopAll();
-	};
-
-	module.exports = Scratch3ControlBlocks;
-
-
-/***/ },
-/* 69 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(70)
-
-
-/***/ },
-/* 70 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(71);
-	__webpack_require__(73);
-	__webpack_require__(74);
-	__webpack_require__(75);
-	__webpack_require__(76);
-	__webpack_require__(78);
-
-
-/***/ },
-/* 71 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var asap = __webpack_require__(72);
-
-	function noop() {}
-
-	// States:
-	//
-	// 0 - pending
-	// 1 - fulfilled with _value
-	// 2 - rejected with _value
-	// 3 - adopted the state of another promise, _value
-	//
-	// once the state is no longer pending (0) it is immutable
-
-	// All `_` prefixed properties will be reduced to `_{random number}`
-	// at build time to obfuscate them and discourage their use.
-	// We don't use symbols or Object.defineProperty to fully hide them
-	// because the performance isn't good enough.
-
-
-	// to avoid using try/catch inside critical functions, we
-	// extract them to here.
-	var LAST_ERROR = null;
-	var IS_ERROR = {};
-	function getThen(obj) {
-	  try {
-	    return obj.then;
-	  } catch (ex) {
-	    LAST_ERROR = ex;
-	    return IS_ERROR;
-	  }
-	}
-
-	function tryCallOne(fn, a) {
-	  try {
-	    return fn(a);
-	  } catch (ex) {
-	    LAST_ERROR = ex;
-	    return IS_ERROR;
-	  }
-	}
-	function tryCallTwo(fn, a, b) {
-	  try {
-	    fn(a, b);
-	  } catch (ex) {
-	    LAST_ERROR = ex;
-	    return IS_ERROR;
-	  }
-	}
-
-	module.exports = Promise;
-
-	function Promise(fn) {
-	  if (typeof this !== 'object') {
-	    throw new TypeError('Promises must be constructed via new');
-	  }
-	  if (typeof fn !== 'function') {
-	    throw new TypeError('not a function');
-	  }
-	  this._45 = 0;
-	  this._81 = 0;
-	  this._65 = null;
-	  this._54 = null;
-	  if (fn === noop) return;
-	  doResolve(fn, this);
-	}
-	Promise._10 = null;
-	Promise._97 = null;
-	Promise._61 = noop;
-
-	Promise.prototype.then = function(onFulfilled, onRejected) {
-	  if (this.constructor !== Promise) {
-	    return safeThen(this, onFulfilled, onRejected);
-	  }
-	  var res = new Promise(noop);
-	  handle(this, new Handler(onFulfilled, onRejected, res));
-	  return res;
-	};
-
-	function safeThen(self, onFulfilled, onRejected) {
-	  return new self.constructor(function (resolve, reject) {
-	    var res = new Promise(noop);
-	    res.then(resolve, reject);
-	    handle(self, new Handler(onFulfilled, onRejected, res));
-	  });
-	};
-	function handle(self, deferred) {
-	  while (self._81 === 3) {
-	    self = self._65;
-	  }
-	  if (Promise._10) {
-	    Promise._10(self);
-	  }
-	  if (self._81 === 0) {
-	    if (self._45 === 0) {
-	      self._45 = 1;
-	      self._54 = deferred;
-	      return;
-	    }
-	    if (self._45 === 1) {
-	      self._45 = 2;
-	      self._54 = [self._54, deferred];
-	      return;
-	    }
-	    self._54.push(deferred);
-	    return;
-	  }
-	  handleResolved(self, deferred);
-	}
-
-	function handleResolved(self, deferred) {
-	  asap(function() {
-	    var cb = self._81 === 1 ? deferred.onFulfilled : deferred.onRejected;
-	    if (cb === null) {
-	      if (self._81 === 1) {
-	        resolve(deferred.promise, self._65);
-	      } else {
-	        reject(deferred.promise, self._65);
-	      }
-	      return;
-	    }
-	    var ret = tryCallOne(cb, self._65);
-	    if (ret === IS_ERROR) {
-	      reject(deferred.promise, LAST_ERROR);
-	    } else {
-	      resolve(deferred.promise, ret);
-	    }
-	  });
-	}
-	function resolve(self, newValue) {
-	  // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure
-	  if (newValue === self) {
-	    return reject(
-	      self,
-	      new TypeError('A promise cannot be resolved with itself.')
-	    );
-	  }
-	  if (
-	    newValue &&
-	    (typeof newValue === 'object' || typeof newValue === 'function')
-	  ) {
-	    var then = getThen(newValue);
-	    if (then === IS_ERROR) {
-	      return reject(self, LAST_ERROR);
-	    }
-	    if (
-	      then === self.then &&
-	      newValue instanceof Promise
-	    ) {
-	      self._81 = 3;
-	      self._65 = newValue;
-	      finale(self);
-	      return;
-	    } else if (typeof then === 'function') {
-	      doResolve(then.bind(newValue), self);
-	      return;
-	    }
-	  }
-	  self._81 = 1;
-	  self._65 = newValue;
-	  finale(self);
-	}
-
-	function reject(self, newValue) {
-	  self._81 = 2;
-	  self._65 = newValue;
-	  if (Promise._97) {
-	    Promise._97(self, newValue);
-	  }
-	  finale(self);
-	}
-	function finale(self) {
-	  if (self._45 === 1) {
-	    handle(self, self._54);
-	    self._54 = null;
-	  }
-	  if (self._45 === 2) {
-	    for (var i = 0; i < self._54.length; i++) {
-	      handle(self, self._54[i]);
-	    }
-	    self._54 = null;
-	  }
-	}
-
-	function Handler(onFulfilled, onRejected, promise){
-	  this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
-	  this.onRejected = typeof onRejected === 'function' ? onRejected : null;
-	  this.promise = promise;
-	}
-
 	/**
-	 * Take a potentially misbehaving resolver function and make sure
-	 * onFulfilled and onRejected are only called once.
-	 *
-	 * Makes no guarantees about asynchrony.
+	 * Set visibility of the clone; i.e., whether it's shown or hidden.
+	 * @param {!boolean} visible True if the sprite should be shown.
 	 */
-	function doResolve(fn, promise) {
-	  var done = false;
-	  var res = tryCallTwo(fn, function (value) {
-	    if (done) return;
-	    done = true;
-	    resolve(promise, value);
-	  }, function (reason) {
-	    if (done) return;
-	    done = true;
-	    reject(promise, reason);
-	  })
-	  if (!done && res === IS_ERROR) {
-	    done = true;
-	    reject(promise, LAST_ERROR);
-	  }
-	}
-
-
-/***/ },
-/* 72 */
-/***/ function(module, exports) {
-
-	/* WEBPACK VAR INJECTION */(function(global) {"use strict";
-
-	// Use the fastest means possible to execute a task in its own turn, with
-	// priority over other events including IO, animation, reflow, and redraw
-	// events in browsers.
-	//
-	// An exception thrown by a task will permanently interrupt the processing of
-	// subsequent tasks. The higher level `asap` function ensures that if an
-	// exception is thrown by a task, that the task queue will continue flushing as
-	// soon as possible, but if you use `rawAsap` directly, you are responsible to
-	// either ensure that no exceptions are thrown from your task, or to manually
-	// call `rawAsap.requestFlush` if an exception is thrown.
-	module.exports = rawAsap;
-	function rawAsap(task) {
-	    if (!queue.length) {
-	        requestFlush();
-	        flushing = true;
+	Clone.prototype.setVisible = function (visible) {
+	    if (this.isStage) {
+	        return;
 	    }
-	    // Equivalent to push, but avoids a function call.
-	    queue[queue.length] = task;
-	}
-
-	var queue = [];
-	// Once a flush has been requested, no further calls to `requestFlush` are
-	// necessary until the next `flush` completes.
-	var flushing = false;
-	// `requestFlush` is an implementation-specific method that attempts to kick
-	// off a `flush` event as quickly as possible. `flush` will attempt to exhaust
-	// the event queue before yielding to the browser's own event loop.
-	var requestFlush;
-	// The position of the next task to execute in the task queue. This is
-	// preserved between calls to `flush` so that it can be resumed if
-	// a task throws an exception.
-	var index = 0;
-	// If a task schedules additional tasks recursively, the task queue can grow
-	// unbounded. To prevent memory exhaustion, the task queue will periodically
-	// truncate already-completed tasks.
-	var capacity = 1024;
-
-	// The flush function processes all tasks that have been scheduled with
-	// `rawAsap` unless and until one of those tasks throws an exception.
-	// If a task throws an exception, `flush` ensures that its state will remain
-	// consistent and will resume where it left off when called again.
-	// However, `flush` does not make any arrangements to be called again if an
-	// exception is thrown.
-	function flush() {
-	    while (index < queue.length) {
-	        var currentIndex = index;
-	        // Advance the index before calling the task. This ensures that we will
-	        // begin flushing on the next task the task throws an error.
-	        index = index + 1;
-	        queue[currentIndex].call();
-	        // Prevent leaking memory for long chains of recursive calls to `asap`.
-	        // If we call `asap` within tasks scheduled by `asap`, the queue will
-	        // grow, but to avoid an O(n) walk for every task we execute, we don't
-	        // shift tasks off the queue after they have been executed.
-	        // Instead, we periodically shift 1024 tasks off the queue.
-	        if (index > capacity) {
-	            // Manually shift all values starting at the index back to the
-	            // beginning of the queue.
-	            for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {
-	                queue[scan] = queue[scan + index];
-	            }
-	            queue.length -= index;
-	            index = 0;
-	        }
-	    }
-	    queue.length = 0;
-	    index = 0;
-	    flushing = false;
-	}
-
-	// `requestFlush` is implemented using a strategy based on data collected from
-	// every available SauceLabs Selenium web driver worker at time of writing.
-	// https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593
-
-	// Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that
-	// have WebKitMutationObserver but not un-prefixed MutationObserver.
-	// Must use `global` instead of `window` to work in both frames and web
-	// workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.
-	var BrowserMutationObserver = global.MutationObserver || global.WebKitMutationObserver;
-
-	// MutationObservers are desirable because they have high priority and work
-	// reliably everywhere they are implemented.
-	// They are implemented in all modern browsers.
-	//
-	// - Android 4-4.3
-	// - Chrome 26-34
-	// - Firefox 14-29
-	// - Internet Explorer 11
-	// - iPad Safari 6-7.1
-	// - iPhone Safari 7-7.1
-	// - Safari 6-7
-	if (typeof BrowserMutationObserver === "function") {
-	    requestFlush = makeRequestCallFromMutationObserver(flush);
-
-	// MessageChannels are desirable because they give direct access to the HTML
-	// task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera
-	// 11-12, and in web workers in many engines.
-	// Although message channels yield to any queued rendering and IO tasks, they
-	// would be better than imposing the 4ms delay of timers.
-	// However, they do not work reliably in Internet Explorer or Safari.
-
-	// Internet Explorer 10 is the only browser that has setImmediate but does
-	// not have MutationObservers.
-	// Although setImmediate yields to the browser's renderer, it would be
-	// preferrable to falling back to setTimeout since it does not have
-	// the minimum 4ms penalty.
-	// Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and
-	// Desktop to a lesser extent) that renders both setImmediate and
-	// MessageChannel useless for the purposes of ASAP.
-	// https://github.com/kriskowal/q/issues/396
-
-	// Timers are implemented universally.
-	// We fall back to timers in workers in most engines, and in foreground
-	// contexts in the following browsers.
-	// However, note that even this simple case requires nuances to operate in a
-	// broad spectrum of browsers.
-	//
-	// - Firefox 3-13
-	// - Internet Explorer 6-9
-	// - iPad Safari 4.3
-	// - Lynx 2.8.7
-	} else {
-	    requestFlush = makeRequestCallFromTimer(flush);
-	}
-
-	// `requestFlush` requests that the high priority event queue be flushed as
-	// soon as possible.
-	// This is useful to prevent an error thrown in a task from stalling the event
-	// queue if the exception handled by Node.js’s
-	// `process.on("uncaughtException")` or by a domain.
-	rawAsap.requestFlush = requestFlush;
-
-	// To request a high priority event, we induce a mutation observer by toggling
-	// the text of a text node between "1" and "-1".
-	function makeRequestCallFromMutationObserver(callback) {
-	    var toggle = 1;
-	    var observer = new BrowserMutationObserver(callback);
-	    var node = document.createTextNode("");
-	    observer.observe(node, {characterData: true});
-	    return function requestCall() {
-	        toggle = -toggle;
-	        node.data = toggle;
-	    };
-	}
-
-	// The message channel technique was discovered by Malte Ubl and was the
-	// original foundation for this library.
-	// http://www.nonblocking.io/2011/06/windownexttick.html
-
-	// Safari 6.0.5 (at least) intermittently fails to create message ports on a
-	// page's first load. Thankfully, this version of Safari supports
-	// MutationObservers, so we don't need to fall back in that case.
-
-	// function makeRequestCallFromMessageChannel(callback) {
-	//     var channel = new MessageChannel();
-	//     channel.port1.onmessage = callback;
-	//     return function requestCall() {
-	//         channel.port2.postMessage(0);
-	//     };
-	// }
-
-	// For reasons explained above, we are also unable to use `setImmediate`
-	// under any circumstances.
-	// Even if we were, there is another bug in Internet Explorer 10.
-	// It is not sufficient to assign `setImmediate` to `requestFlush` because
-	// `setImmediate` must be called *by name* and therefore must be wrapped in a
-	// closure.
-	// Never forget.
-
-	// function makeRequestCallFromSetImmediate(callback) {
-	//     return function requestCall() {
-	//         setImmediate(callback);
-	//     };
-	// }
-
-	// Safari 6.0 has a problem where timers will get lost while the user is
-	// scrolling. This problem does not impact ASAP because Safari 6.0 supports
-	// mutation observers, so that implementation is used instead.
-	// However, if we ever elect to use timers in Safari, the prevalent work-around
-	// is to add a scroll event listener that calls for a flush.
-
-	// `setTimeout` does not call the passed callback if the delay is less than
-	// approximately 7 in web workers in Firefox 8 through 18, and sometimes not
-	// even then.
-
-	function makeRequestCallFromTimer(callback) {
-	    return function requestCall() {
-	        // We dispatch a timeout with a specified delay of 0 for engines that
-	        // can reliably accommodate that request. This will usually be snapped
-	        // to a 4 milisecond delay, but once we're flushing, there's no delay
-	        // between events.
-	        var timeoutHandle = setTimeout(handleTimer, 0);
-	        // However, since this timer gets frequently dropped in Firefox
-	        // workers, we enlist an interval handle that will try to fire
-	        // an event 20 times per second until it succeeds.
-	        var intervalHandle = setInterval(handleTimer, 50);
-
-	        function handleTimer() {
-	            // Whichever timer succeeds will cancel both timers and
-	            // execute the callback.
-	            clearTimeout(timeoutHandle);
-	            clearInterval(intervalHandle);
-	            callback();
-	        }
-	    };
-	}
-
-	// This is for `asap.js` only.
-	// Its name will be periodically randomized to break any code that depends on
-	// its existence.
-	rawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;
-
-	// ASAP was originally a nextTick shim included in Q. This was factored out
-	// into this ASAP package. It was later adapted to RSVP which made further
-	// amendments. These decisions, particularly to marginalize MessageChannel and
-	// to capture the MutationObserver implementation in a closure, were integrated
-	// back into ASAP proper.
-	// https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js
-
-	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())))
-
-/***/ },
-/* 73 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var Promise = __webpack_require__(71);
-
-	module.exports = Promise;
-	Promise.prototype.done = function (onFulfilled, onRejected) {
-	  var self = arguments.length ? this.then.apply(this, arguments) : this;
-	  self.then(null, function (err) {
-	    setTimeout(function () {
-	      throw err;
-	    }, 0);
-	  });
-	};
-
-
-/***/ },
-/* 74 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var Promise = __webpack_require__(71);
-
-	module.exports = Promise;
-	Promise.prototype['finally'] = function (f) {
-	  return this.then(function (value) {
-	    return Promise.resolve(f()).then(function () {
-	      return value;
-	    });
-	  }, function (err) {
-	    return Promise.resolve(f()).then(function () {
-	      throw err;
-	    });
-	  });
-	};
-
-
-/***/ },
-/* 75 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	//This file contains the ES6 extensions to the core Promises/A+ API
-
-	var Promise = __webpack_require__(71);
-
-	module.exports = Promise;
-
-	/* Static Functions */
-
-	var TRUE = valuePromise(true);
-	var FALSE = valuePromise(false);
-	var NULL = valuePromise(null);
-	var UNDEFINED = valuePromise(undefined);
-	var ZERO = valuePromise(0);
-	var EMPTYSTRING = valuePromise('');
-
-	function valuePromise(value) {
-	  var p = new Promise(Promise._61);
-	  p._81 = 1;
-	  p._65 = value;
-	  return p;
-	}
-	Promise.resolve = function (value) {
-	  if (value instanceof Promise) return value;
-
-	  if (value === null) return NULL;
-	  if (value === undefined) return UNDEFINED;
-	  if (value === true) return TRUE;
-	  if (value === false) return FALSE;
-	  if (value === 0) return ZERO;
-	  if (value === '') return EMPTYSTRING;
-
-	  if (typeof value === 'object' || typeof value === 'function') {
-	    try {
-	      var then = value.then;
-	      if (typeof then === 'function') {
-	        return new Promise(then.bind(value));
-	      }
-	    } catch (ex) {
-	      return new Promise(function (resolve, reject) {
-	        reject(ex);
-	      });
-	    }
-	  }
-	  return valuePromise(value);
-	};
-
-	Promise.all = function (arr) {
-	  var args = Array.prototype.slice.call(arr);
-
-	  return new Promise(function (resolve, reject) {
-	    if (args.length === 0) return resolve([]);
-	    var remaining = args.length;
-	    function res(i, val) {
-	      if (val && (typeof val === 'object' || typeof val === 'function')) {
-	        if (val instanceof Promise && val.then === Promise.prototype.then) {
-	          while (val._81 === 3) {
-	            val = val._65;
-	          }
-	          if (val._81 === 1) return res(i, val._65);
-	          if (val._81 === 2) reject(val._65);
-	          val.then(function (val) {
-	            res(i, val);
-	          }, reject);
-	          return;
-	        } else {
-	          var then = val.then;
-	          if (typeof then === 'function') {
-	            var p = new Promise(then.bind(val));
-	            p.then(function (val) {
-	              res(i, val);
-	            }, reject);
-	            return;
-	          }
-	        }
-	      }
-	      args[i] = val;
-	      if (--remaining === 0) {
-	        resolve(args);
-	      }
-	    }
-	    for (var i = 0; i < args.length; i++) {
-	      res(i, args[i]);
-	    }
-	  });
-	};
-
-	Promise.reject = function (value) {
-	  return new Promise(function (resolve, reject) {
-	    reject(value);
-	  });
-	};
-
-	Promise.race = function (values) {
-	  return new Promise(function (resolve, reject) {
-	    values.forEach(function(value){
-	      Promise.resolve(value).then(resolve, reject);
-	    });
-	  });
-	};
-
-	/* Prototype Methods */
-
-	Promise.prototype['catch'] = function (onRejected) {
-	  return this.then(null, onRejected);
-	};
-
-
-/***/ },
-/* 76 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	// This file contains then/promise specific extensions that are only useful
-	// for node.js interop
-
-	var Promise = __webpack_require__(71);
-	var asap = __webpack_require__(77);
-
-	module.exports = Promise;
-
-	/* Static Functions */
-
-	Promise.denodeify = function (fn, argumentCount) {
-	  if (
-	    typeof argumentCount === 'number' && argumentCount !== Infinity
-	  ) {
-	    return denodeifyWithCount(fn, argumentCount);
-	  } else {
-	    return denodeifyWithoutCount(fn);
-	  }
-	}
-
-	var callbackFn = (
-	  'function (err, res) {' +
-	  'if (err) { rj(err); } else { rs(res); }' +
-	  '}'
-	);
-	function denodeifyWithCount(fn, argumentCount) {
-	  var args = [];
-	  for (var i = 0; i < argumentCount; i++) {
-	    args.push('a' + i);
-	  }
-	  var body = [
-	    'return function (' + args.join(',') + ') {',
-	    'var self = this;',
-	    'return new Promise(function (rs, rj) {',
-	    'var res = fn.call(',
-	    ['self'].concat(args).concat([callbackFn]).join(','),
-	    ');',
-	    'if (res &&',
-	    '(typeof res === "object" || typeof res === "function") &&',
-	    'typeof res.then === "function"',
-	    ') {rs(res);}',
-	    '});',
-	    '};'
-	  ].join('');
-	  return Function(['Promise', 'fn'], body)(Promise, fn);
-	}
-	function denodeifyWithoutCount(fn) {
-	  var fnLength = Math.max(fn.length - 1, 3);
-	  var args = [];
-	  for (var i = 0; i < fnLength; i++) {
-	    args.push('a' + i);
-	  }
-	  var body = [
-	    'return function (' + args.join(',') + ') {',
-	    'var self = this;',
-	    'var args;',
-	    'var argLength = arguments.length;',
-	    'if (arguments.length > ' + fnLength + ') {',
-	    'args = new Array(arguments.length + 1);',
-	    'for (var i = 0; i < arguments.length; i++) {',
-	    'args[i] = arguments[i];',
-	    '}',
-	    '}',
-	    'return new Promise(function (rs, rj) {',
-	    'var cb = ' + callbackFn + ';',
-	    'var res;',
-	    'switch (argLength) {',
-	    args.concat(['extra']).map(function (_, index) {
-	      return (
-	        'case ' + (index) + ':' +
-	        'res = fn.call(' + ['self'].concat(args.slice(0, index)).concat('cb').join(',') + ');' +
-	        'break;'
-	      );
-	    }).join(''),
-	    'default:',
-	    'args[argLength] = cb;',
-	    'res = fn.apply(self, args);',
-	    '}',
-	    
-	    'if (res &&',
-	    '(typeof res === "object" || typeof res === "function") &&',
-	    'typeof res.then === "function"',
-	    ') {rs(res);}',
-	    '});',
-	    '};'
-	  ].join('');
-
-	  return Function(
-	    ['Promise', 'fn'],
-	    body
-	  )(Promise, fn);
-	}
-
-	Promise.nodeify = function (fn) {
-	  return function () {
-	    var args = Array.prototype.slice.call(arguments);
-	    var callback =
-	      typeof args[args.length - 1] === 'function' ? args.pop() : null;
-	    var ctx = this;
-	    try {
-	      return fn.apply(this, arguments).nodeify(callback, ctx);
-	    } catch (ex) {
-	      if (callback === null || typeof callback == 'undefined') {
-	        return new Promise(function (resolve, reject) {
-	          reject(ex);
+	    this.visible = visible;
+	    if (this.renderer) {
+	        this.renderer.updateDrawableProperties(this.drawableID, {
+	            visible: this.visible
 	        });
-	      } else {
-	        asap(function () {
-	          callback.call(ctx, ex);
-	        })
-	      }
 	    }
-	  }
-	}
-
-	Promise.prototype.nodeify = function (callback, ctx) {
-	  if (typeof callback != 'function') return this;
-
-	  this.then(function (value) {
-	    asap(function () {
-	      callback.call(ctx, null, value);
-	    });
-	  }, function (err) {
-	    asap(function () {
-	      callback.call(ctx, err);
-	    });
-	  });
-	}
-
-
-/***/ },
-/* 77 */
-/***/ function(module, exports, __webpack_require__) {
-
-	"use strict";
-
-	// rawAsap provides everything we need except exception management.
-	var rawAsap = __webpack_require__(72);
-	// RawTasks are recycled to reduce GC churn.
-	var freeTasks = [];
-	// We queue errors to ensure they are thrown in right order (FIFO).
-	// Array-as-queue is good enough here, since we are just dealing with exceptions.
-	var pendingErrors = [];
-	var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);
-
-	function throwFirstError() {
-	    if (pendingErrors.length) {
-	        throw pendingErrors.shift();
-	    }
-	}
+	};
 
 	/**
-	 * Calls a task as soon as possible after returning, in its own event, with priority
-	 * over other events like animation, reflow, and repaint. An error thrown from an
-	 * event will not interrupt, nor even substantially slow down the processing of
-	 * other events, but will be rather postponed to a lower priority event.
-	 * @param {{call}} task A callable object, typically a function that takes no
-	 * arguments.
+	 * Set size of the clone, as a percentage of the costume size.
+	 * @param {!number} size Size of clone, from 5 to 535.
 	 */
-	module.exports = asap;
-	function asap(task) {
-	    var rawTask;
-	    if (freeTasks.length) {
-	        rawTask = freeTasks.pop();
-	    } else {
-	        rawTask = new RawTask();
+	Clone.prototype.setSize = function (size) {
+	    if (this.isStage) {
+	        return;
 	    }
-	    rawTask.task = task;
-	    rawAsap(rawTask);
-	}
+	    // Keep size between 5% and 535%.
+	    this.size = MathUtil.clamp(size, 5, 535);
+	    if (this.renderer) {
+	        this.renderer.updateDrawableProperties(this.drawableID, {
+	            scale: [this.size, this.size]
+	        });
+	    }
+	};
 
-	// We wrap tasks with recyclable task objects.  A task object implements
-	// `call`, just like a function.
-	function RawTask() {
-	    this.task = null;
-	}
+	/**
+	 * Set a particular graphic effect on this clone.
+	 * @param {!string} effectName Name of effect (see `Clone.prototype.effects`).
+	 * @param {!number} value Numerical magnitude of effect.
+	 */
+	Clone.prototype.setEffect = function (effectName, value) {
+	    if (!this.effects.hasOwnProperty(effectName)) return;
+	    this.effects[effectName] = value;
+	    if (this.renderer) {
+	        var props = {};
+	        props[effectName] = this.effects[effectName];
+	        this.renderer.updateDrawableProperties(this.drawableID, props);
+	    }
+	};
 
-	// The sole purpose of wrapping the task is to catch the exception and recycle
-	// the task object after its single use.
-	RawTask.prototype.call = function () {
-	    try {
-	        this.task.call();
-	    } catch (error) {
-	        if (asap.onerror) {
-	            // This hook exists purely for testing purposes.
-	            // Its name will be periodically randomized to break any code that
-	            // depends on its existence.
-	            asap.onerror(error);
-	        } else {
-	            // In a web browser, exceptions are not fatal. However, to avoid
-	            // slowing down the queue of pending tasks, we rethrow the error in a
-	            // lower priority turn.
-	            pendingErrors.push(error);
-	            requestErrorThrow();
+	/**
+	 * Clear all graphic effects on this clone.
+	 */
+	Clone.prototype.clearEffects = function () {
+	    for (var effectName in this.effects) {
+	        this.effects[effectName] = 0;
+	    }
+	    if (this.renderer) {
+	        this.renderer.updateDrawableProperties(this.drawableID, this.effects);
+	    }
+	};
+
+	/**
+	 * Set the current costume of this clone.
+	 * @param {number} index New index of costume.
+	 */
+	Clone.prototype.setCostume = function (index) {
+	    // Keep the costume index within possible values.
+	    this.currentCostume = MathUtil.wrapClamp(
+	        index, 0, this.sprite.costumes.length - 1
+	    );
+	    if (this.renderer) {
+	        this.renderer.updateDrawableProperties(this.drawableID, {
+	            skin: this.sprite.costumes[this.currentCostume].skin
+	        });
+	    }
+	};
+
+	/**
+	 * Get a costume index of this clone, by name of the costume.
+	 * @param {?string} costumeName Name of a costume.
+	 * @return {number} Index of the named costume, or -1 if not present.
+	 */
+	Clone.prototype.getCostumeIndexByName = function (costumeName) {
+	    for (var i = 0; i < this.sprite.costumes.length; i++) {
+	        if (this.sprite.costumes[i].name == costumeName) {
+	            return i;
 	        }
-	    } finally {
-	        this.task = null;
-	        freeTasks[freeTasks.length] = this;
+	    }
+	    return -1;
+	};
+
+	/**
+	 * Update all drawable properties for this clone.
+	 * Use when a batch has changed, e.g., when the drawable is first created.
+	 */
+	Clone.prototype.updateAllDrawableProperties = function () {
+	    if (this.renderer) {
+	        this.renderer.updateDrawableProperties(this.drawableID, {
+	            position: [this.x, this.y],
+	            direction: this.direction,
+	            scale: [this.size, this.size],
+	            visible: this.visible,
+	            skin: this.sprite.costumes[this.currentCostume].skin
+	        });
 	    }
 	};
 
+	/**
+	 * Return the human-readable name for this clone, i.e., the sprite's name.
+	 * @override
+	 * @returns {string} Human-readable name for the clone.
+	 */
+	Clone.prototype.getName = function () {
+	    return this.sprite.name;
+	};
+
+	/**
+	 * Return whether the clone is touching a color.
+	 * @param {Array.<number>} rgb [r,g,b], values between 0-255.
+	 * @return {Promise.<Boolean>} True iff the clone is touching the color.
+	 */
+	Clone.prototype.isTouchingColor = function (rgb) {
+	    if (this.renderer) {
+	        return this.renderer.isTouchingColor(this.drawableID, rgb);
+	    }
+	    return false;
+	};
+
+	/**
+	 * Return whether the clone's color is touching a color.
+	 * @param {Object} targetRgb {Array.<number>} [r,g,b], values between 0-255.
+	 * @param {Object} maskRgb {Array.<number>} [r,g,b], values between 0-255.
+	 * @return {Promise.<Boolean>} True iff the clone's color is touching the color.
+	 */
+	Clone.prototype.colorIsTouchingColor = function (targetRgb, maskRgb) {
+	    if (this.renderer) {
+	        return this.renderer.isTouchingColor(
+	            this.drawableID,
+	            targetRgb,
+	            maskRgb
+	        );
+	    }
+	    return false;
+	};
+
+	module.exports = Clone;
+
 
 /***/ },
-/* 78 */
+/* 87 */
 /***/ function(module, exports, __webpack_require__) {
 
-	'use strict';
-
-	var Promise = __webpack_require__(71);
-
-	module.exports = Promise;
-	Promise.enableSynchronous = function () {
-	  Promise.prototype.isPending = function() {
-	    return this.getState() == 0;
-	  };
-
-	  Promise.prototype.isFulfilled = function() {
-	    return this.getState() == 1;
-	  };
-
-	  Promise.prototype.isRejected = function() {
-	    return this.getState() == 2;
-	  };
-
-	  Promise.prototype.getValue = function () {
-	    if (this._81 === 3) {
-	      return this._65.getValue();
-	    }
-
-	    if (!this.isFulfilled()) {
-	      throw new Error('Cannot get a value of an unfulfilled promise.');
-	    }
-
-	    return this._65;
-	  };
-
-	  Promise.prototype.getReason = function () {
-	    if (this._81 === 3) {
-	      return this._65.getReason();
-	    }
-
-	    if (!this.isRejected()) {
-	      throw new Error('Cannot get a rejection reason of a non-rejected promise.');
-	    }
-
-	    return this._65;
-	  };
-
-	  Promise.prototype.getState = function () {
-	    if (this._81 === 3) {
-	      return this._65.getState();
-	    }
-	    if (this._81 === -1 || this._81 === -2) {
-	      return 0;
-	    }
-
-	    return this._81;
-	  };
-	};
-
-	Promise.disableSynchronous = function() {
-	  Promise.prototype.isPending = undefined;
-	  Promise.prototype.isFulfilled = undefined;
-	  Promise.prototype.isRejected = undefined;
-	  Promise.prototype.getValue = undefined;
-	  Promise.prototype.getReason = undefined;
-	  Promise.prototype.getState = undefined;
-	};
-
-
-/***/ },
-/* 79 */
-/***/ function(module, exports) {
-
-	function Scratch3EventBlocks(runtime) {
-	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
-	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
-	 */
-	Scratch3EventBlocks.prototype.getPrimitives = function() {
-	    return {
-	        'event_whenflagclicked': this.whenFlagClicked,
-	        'event_whenbroadcastreceived': this.whenBroadcastReceived,
-	        'event_broadcast': this.broadcast
-	    };
-	};
-
-
-	Scratch3EventBlocks.prototype.whenFlagClicked = function() {
-	    // No-op
-	};
-
-	Scratch3EventBlocks.prototype.whenBroadcastReceived = function() {
-	    // No-op
-	};
-
-	Scratch3EventBlocks.prototype.broadcast = function() {
-	    // @todo
-	};
-
-	module.exports = Scratch3EventBlocks;
-
-
-/***/ },
-/* 80 */
-/***/ function(module, exports) {
-
-	function Scratch3LooksBlocks(runtime) {
-	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
-	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
-	 */
-	Scratch3LooksBlocks.prototype.getPrimitives = function() {
-	    return {
-	        'looks_say': this.say,
-	        'looks_sayforsecs': this.sayforsecs,
-	        'looks_think': this.think,
-	        'looks_thinkforsecs': this.sayforsecs,
-	        'looks_show': this.show,
-	        'looks_hide': this.hide,
-	        'looks_effectmenu': this.effectMenu,
-	        'looks_changeeffectby': this.changeEffect,
-	        'looks_seteffectto': this.setEffect,
-	        'looks_cleargraphiceffects': this.clearEffects,
-	        'looks_changesizeby': this.changeSize,
-	        'looks_setsizeto': this.setSize,
-	        'looks_size': this.getSize
-	    };
-	};
-
-	Scratch3LooksBlocks.prototype.say = function (args, util) {
-	    util.target.setSay('say', args.MESSAGE);
-	};
-
-	Scratch3LooksBlocks.prototype.sayforsecs = function (args, util) {
-	    util.target.setSay('say', args.MESSAGE);
-	    return new Promise(function(resolve) {
-	        setTimeout(function() {
-	            // Clear say bubble and proceed.
-	            util.target.setSay();
-	            resolve();
-	        }, 1000 * args.SECS);
-	    });
-	};
-
-	Scratch3LooksBlocks.prototype.think = function (args, util) {
-	    util.target.setSay('think', args.MESSAGE);
-	};
-
-	Scratch3LooksBlocks.prototype.thinkforsecs = function (args, util) {
-	    util.target.setSay('think', args.MESSAGE);
-	    return new Promise(function(resolve) {
-	        setTimeout(function() {
-	            // Clear say bubble and proceed.
-	            util.target.setSay();
-	            resolve();
-	        }, 1000 * args.SECS);
-	    });
-	};
-
-	Scratch3LooksBlocks.prototype.show = function (args, util) {
-	    util.target.setVisible(true);
-	};
-
-	Scratch3LooksBlocks.prototype.hide = function (args, util) {
-	    util.target.setVisible(false);
-	};
-
-	Scratch3LooksBlocks.prototype.effectMenu = function (args) {
-	    return args.EFFECT.toLowerCase();
-	};
-
-	Scratch3LooksBlocks.prototype.changeEffect = function (args, util) {
-	    var newValue = args.CHANGE + util.target.effects[args.EFFECT];
-	    util.target.setEffect(args.EFFECT, newValue);
-	};
-
-	Scratch3LooksBlocks.prototype.setEffect = function (args, util) {
-	    util.target.setEffect(args.EFFECT, args.VALUE);
-	};
-
-	Scratch3LooksBlocks.prototype.clearEffects = function (args, util) {
-	    util.target.clearEffects();
-	};
-
-	Scratch3LooksBlocks.prototype.changeSize = function (args, util) {
-	    util.target.setSize(util.target.size + args.CHANGE);
-	};
-
-	Scratch3LooksBlocks.prototype.setSize = function (args, util) {
-	    util.target.setSize(args.SIZE);
-	};
-
-	Scratch3LooksBlocks.prototype.getSize = function (args, util) {
-	    return util.target.size;
-	};
-
-	module.exports = Scratch3LooksBlocks;
-
-
-/***/ },
-/* 81 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var MathUtil = __webpack_require__(8);
-
-	function Scratch3MotionBlocks(runtime) {
-	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
-	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
-	 */
-	Scratch3MotionBlocks.prototype.getPrimitives = function() {
-	    return {
-	        'motion_movesteps': this.moveSteps,
-	        'motion_gotoxy': this.goToXY,
-	        'motion_turnright': this.turnRight,
-	        'motion_turnleft': this.turnLeft,
-	        'motion_pointindirection': this.pointInDirection,
-	        'motion_changexby': this.changeX,
-	        'motion_setx': this.setX,
-	        'motion_changeyby': this.changeY,
-	        'motion_sety': this.setY,
-	        'motion_xposition': this.getX,
-	        'motion_yposition': this.getY,
-	        'motion_direction': this.getDirection
-	    };
-	};
-
-	Scratch3MotionBlocks.prototype.moveSteps = function (args, util) {
-	    var radians = MathUtil.degToRad(util.target.direction);
-	    var dx = args.STEPS * Math.cos(radians);
-	    var dy = args.STEPS * Math.sin(radians);
-	    util.target.setXY(util.target.x + dx, util.target.y + dy);
-	};
-
-	Scratch3MotionBlocks.prototype.goToXY = function (args, util) {
-	    util.target.setXY(args.X, args.Y);
-	};
-
-	Scratch3MotionBlocks.prototype.turnRight = function (args, util) {
-	    util.target.setDirection(util.target.direction + args.DEGREES);
-	};
-
-	Scratch3MotionBlocks.prototype.turnLeft = function (args, util) {
-	    util.target.setDirection(util.target.direction - args.DEGREES);
-	};
-
-	Scratch3MotionBlocks.prototype.pointInDirection = function (args, util) {
-	    util.target.setDirection(args.DIRECTION);
-	};
-
-	Scratch3MotionBlocks.prototype.changeX = function (args, util) {
-	    util.target.setXY(util.target.x + args.DX, util.target.y);
-	};
-
-	Scratch3MotionBlocks.prototype.setX = function (args, util) {
-	    util.target.setXY(args.X, util.target.y);
-	};
-
-	Scratch3MotionBlocks.prototype.changeY = function (args, util) {
-	    util.target.setXY(util.target.x, util.target.y + args.DY);
-	};
-
-	Scratch3MotionBlocks.prototype.setY = function (args, util) {
-	    util.target.setXY(util.target.x, args.Y);
-	};
-
-	Scratch3MotionBlocks.prototype.getX = function (args, util) {
-	    return util.target.x;
-	};
-
-	Scratch3MotionBlocks.prototype.getY = function (args, util) {
-	    return util.target.y;
-	};
-
-	Scratch3MotionBlocks.prototype.getDirection = function (args, util) {
-	    return util.target.direction;
-	};
-
-	module.exports = Scratch3MotionBlocks;
-
-
-/***/ },
-/* 82 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Cast = __webpack_require__(83);
-
-	function Scratch3OperatorsBlocks(runtime) {
-	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
-	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
-	 */
-	Scratch3OperatorsBlocks.prototype.getPrimitives = function() {
-	    return {
-	        'math_number': this.number,
-	        'math_positive_number': this.number,
-	        'math_whole_number': this.number,
-	        'math_angle': this.number,
-	        'text': this.text,
-	        'operator_add': this.add,
-	        'operator_subtract': this.subtract,
-	        'operator_multiply': this.multiply,
-	        'operator_divide': this.divide,
-	        'operator_lt': this.lt,
-	        'operator_equals': this.equals,
-	        'operator_gt': this.gt,
-	        'operator_and': this.and,
-	        'operator_or': this.or,
-	        'operator_not': this.not,
-	        'operator_random': this.random,
-	        'operator_join': this.join,
-	        'operator_letter_of': this.letterOf,
-	        'operator_length': this.length,
-	        'operator_mod': this.mod,
-	        'operator_round': this.round,
-	        'operator_mathop_menu': this.mathopMenu,
-	        'operator_mathop': this.mathop
-	    };
-	};
-
-	Scratch3OperatorsBlocks.prototype.number = function (args) {
-	    return Cast.toNumber(args.NUM);
-	};
-
-	Scratch3OperatorsBlocks.prototype.text = function (args) {
-	    return Cast.toString(args.TEXT);
-	};
-
-	Scratch3OperatorsBlocks.prototype.add = function (args) {
-	    return Cast.toNumber(args.NUM1) + Cast.toNumber(args.NUM2);
-	};
-
-	Scratch3OperatorsBlocks.prototype.subtract = function (args) {
-	    return Cast.toNumber(args.NUM1) - Cast.toNumber(args.NUM2);
-	};
-
-	Scratch3OperatorsBlocks.prototype.multiply = function (args) {
-	    return Cast.toNumber(args.NUM1) * Cast.toNumber(args.NUM2);
-	};
-
-	Scratch3OperatorsBlocks.prototype.divide = function (args) {
-	    return Cast.toNumber(args.NUM1) / Cast.toNumber(args.NUM2);
-	};
-
-	Scratch3OperatorsBlocks.prototype.lt = function (args) {
-	    return Cast.compare(args.OPERAND1, args.OPERAND2) < 0;
-	};
-
-	Scratch3OperatorsBlocks.prototype.equals = function (args) {
-	    return Cast.compare(args.OPERAND1, args.OPERAND2) == 0;
-	};
-
-	Scratch3OperatorsBlocks.prototype.gt = function (args) {
-	    return Cast.compare(args.OPERAND1, args.OPERAND2) > 0;
-	};
-
-	Scratch3OperatorsBlocks.prototype.and = function (args) {
-	    return Cast.toBoolean(args.OPERAND1 && args.OPERAND2);
-	};
-
-	Scratch3OperatorsBlocks.prototype.or = function (args) {
-	    return Cast.toBoolean(args.OPERAND1 || args.OPERAND2);
-	};
-
-	Scratch3OperatorsBlocks.prototype.not = function (args) {
-	    return Cast.toBoolean(!args.OPERAND);
-	};
-
-	Scratch3OperatorsBlocks.prototype.random = function (args) {
-	    var low = args.FROM <= args.TO ? args.FROM : args.TO;
-	    var high = args.FROM <= args.TO ? args.TO : args.FROM;
-	    if (low == high) return low;
-	    // If both low and high are ints, truncate the result to an int.
-	    var lowInt = low == parseInt(low);
-	    var highInt = high == parseInt(high);
-	    if (lowInt && highInt) {
-	        return low + parseInt(Math.random() * ((high + 1) - low));
-	    }
-	    return (Math.random() * (high - low)) + low;
-	};
-
-	Scratch3OperatorsBlocks.prototype.join = function (args) {
-	    return Cast.toString(args.STRING1) + Cast.toString(args.STRING2);
-	};
-
-	Scratch3OperatorsBlocks.prototype.letterOf = function (args) {
-	    var index = Cast.toNumber(args.LETTER) - 1;
-	    var str = Cast.toString(args.STRING);
-	    // Out of bounds?
-	    if (index < 0 || index >= str.length) {
-	        return '';
-	    }
-	    return str.charAt(index);
-	};
-
-	Scratch3OperatorsBlocks.prototype.length = function (args) {
-	    return Cast.toString(args.STRING).length;
-	};
-
-	Scratch3OperatorsBlocks.prototype.mod = function (args) {
-	    var n = Cast.toNumber(args.NUM1);
-	    var modulus = Cast.toNumber(args.NUM2);
-	    var result = n % modulus;
-	    // Scratch mod is kept positive.
-	    if (result / modulus < 0) result += modulus;
-	    return result;
-	};
-
-	Scratch3OperatorsBlocks.prototype.round = function (args) {
-	    return Math.round(Cast.toNumber(args.NUM));
-	};
-
-	Scratch3OperatorsBlocks.prototype.mathopMenu = function (args) {
-	    return args.OPERATOR;
-	};
-
-	Scratch3OperatorsBlocks.prototype.mathop = function (args) {
-	    var operator = Cast.toString(args.OPERATOR).toLowerCase();
-	    var n = Cast.toNumber(args.NUM);
-	    switch (operator) {
-	    case 'abs': return Math.abs(n);
-	    case 'floor': return Math.floor(n);
-	    case 'ceiling': return Math.ceil(n);
-	    case 'sqrt': return Math.sqrt(n);
-	    case 'sin': return Math.sin((Math.PI * n) / 180);
-	    case 'cos': return Math.cos((Math.PI * n) / 180);
-	    case 'tan': return Math.tan((Math.PI * n) / 180);
-	    case 'asin': return (Math.asin(n) * 180) / Math.PI;
-	    case 'acos': return (Math.acos(n) * 180) / Math.PI;
-	    case 'atan': return (Math.atan(n) * 180) / Math.PI;
-	    case 'ln': return Math.log(n);
-	    case 'log': return Math.log(n) / Math.LN10;
-	    case 'e ^': return Math.exp(n);
-	    case '10 ^': return Math.pow(10, n);
-	    }
-	    return 0;
-	};
-
-	module.exports = Scratch3OperatorsBlocks;
-
-
-/***/ },
-/* 83 */
-/***/ function(module, exports) {
-
-	function Cast () {}
+	var Blocks = __webpack_require__(34);
+	var uid = __webpack_require__(88);
 
 	/**
 	 * @fileoverview
-	 * Utilities for casting and comparing Scratch data-types.
-	 * Scratch behaves slightly differently from JavaScript in many respects,
-	 * and these differences should be encapsulated below.
-	 * For example, in Scratch, add(1, join("hello", world")) -> 1.
-	 * This is because "hello world" is cast to 0.
-	 * In JavaScript, 1 + Number("hello" + "world") would give you NaN.
-	 * Use when coercing a value before computation.
+	 * A Target is an abstract "code-running" object for the Scratch VM.
+	 * Examples include sprites/clones or potentially physical-world devices.
 	 */
 
 	/**
-	 * Scratch cast to number.
-	 * Treats NaN as 0.
-	 * In Scratch 2.0, this is captured by `interp.numArg.`
-	 * @param {*} value Value to cast to number.
-	 * @return {number} The Scratch-casted number value.
+	 * @param {?Blocks} blocks Blocks instance for the blocks owned by this target.
+	 * @constructor
 	 */
-	Cast.toNumber = function (value) {
-	    var n = Number(value);
-	    if (isNaN(n)) {
-	        // Scratch treats NaN as 0, when needed as a number.
-	        // E.g., 0 + NaN -> 0.
-	        return 0;
+	function Target (blocks) {
+	    if (!blocks) {
+	        blocks = new Blocks(this);
 	    }
-	    return n;
-	};
-
-	/**
-	 * Scratch cast to boolean.
-	 * In Scratch 2.0, this is captured by `interp.boolArg.`
-	 * Treats some string values differently from JavaScript.
-	 * @param {*} value Value to cast to boolean.
-	 * @return {boolean} The Scratch-casted boolean value.
-	 */
-	Cast.toBoolean = function (value) {
-	    // Already a boolean?
-	    if (typeof value === 'boolean') {
-	        return value;
-	    }
-	    if (typeof value === 'string') {
-	        // These specific strings are treated as false in Scratch.
-	        if ((value == '') ||
-	            (value == '0') ||
-	            (value.toLowerCase() == 'false')) {
-	            return false;
-	        }
-	        // All other strings treated as true.
-	        return true;
-	    }
-	    // Coerce other values and numbers.
-	    return Boolean(value);
-	};
-
-	/**
-	 * Scratch cast to string.
-	 * @param {*} value Value to cast to string.
-	 * @return {string} The Scratch-casted string value.
-	 */
-	Cast.toString = function (value) {
-	    return String(value);
-	};
-
-	/**
-	 * Compare two values, using Scratch cast, case-insensitive string compare, etc.
-	 * In Scratch 2.0, this is captured by `interp.compare.`
-	 * @param {*} v1 First value to compare.
-	 * @param {*} v2 Second value to compare.
-	 * @returns {Number} Negative number if v1 < v2; 0 if equal; positive otherwise.
-	 */
-	Cast.compare = function (v1, v2) {
-	    var n1 = Number(v1);
-	    var n2 = Number(v2);
-	    if (isNaN(n1) || isNaN(n2)) {
-	        // At least one argument can't be converted to a number.
-	        // Scratch compares strings as case insensitive.
-	        var s1 = String(v1).toLowerCase();
-	        var s2 = String(v2).toLowerCase();
-	        return s1.localeCompare(s2);
-	    } else {
-	        // Compare as numbers.
-	        return n1 - n2;
-	    }
-	};
-
-	module.exports = Cast;
-
-
-/***/ },
-/* 84 */
-/***/ function(module, exports) {
-
-	function Scratch3SensingBlocks(runtime) {
 	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
+	     * A unique ID for this target.
+	     * @type {string}
 	     */
-	    this.runtime = runtime;
+	    this.id = uid();
+	    /**
+	     * Blocks run as code for this target.
+	     * @type {!Blocks}
+	     */
+	    this.blocks = blocks;
 	}
 
 	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
+	 * Return a human-readable name for this target.
+	 * Target implementations should override this.
+	 * @abstract
+	 * @returns {string} Human-readable name for the target.
 	 */
-	Scratch3SensingBlocks.prototype.getPrimitives = function() {
-	    return {
-	        'sensing_timer': this.getTimer,
-	        'sensing_resettimer': this.resetTimer,
-	        'sensing_mousex': this.getMouseX,
-	        'sensing_mousey': this.getMouseY,
-	        'sensing_mousedown': this.getMouseDown
-	    };
+	Target.prototype.getName = function () {
+	    return this.id;
 	};
 
-	Scratch3SensingBlocks.prototype.getTimer = function (args, util) {
-	    return util.ioQuery('clock', 'projectTimer');
+	module.exports = Target;
+
+
+/***/ },
+/* 88 */
+/***/ function(module, exports) {
+
+	/**
+	 * @fileoverview UID generator, from Blockly.
+	 */
+
+	/**
+	 * Legal characters for the unique ID.
+	 * Should be all on a US keyboard.  No XML special characters or control codes.
+	 * Removed $ due to issue 251.
+	 * @private
+	 */
+	var soup_ = '!#%()*+,-./:;=?@[]^_`{|}~' +
+	    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+
+	/**
+	 * Generate a unique ID, from Blockly.  This should be globally unique.
+	 * 87 characters ^ 20 length > 128 bits (better than a UUID).
+	 * @return {string} A globally unique ID string.
+	 */
+	var uid = function () {
+	    var length = 20;
+	    var soupLength = soup_.length;
+	    var id = [];
+	    for (var i = 0; i < length; i++) {
+	        id[i] = soup_.charAt(Math.random() * soupLength);
+	    }
+	    return id.join('');
 	};
 
-	Scratch3SensingBlocks.prototype.resetTimer = function (args, util) {
-	    util.ioQuery('clock', 'resetProjectTimer');
-	};
+	module.exports = uid;
 
-	Scratch3SensingBlocks.prototype.getMouseX = function (args, util) {
-	    return util.ioQuery('mouse', 'getX');
-	};
 
-	Scratch3SensingBlocks.prototype.getMouseY = function (args, util) {
-	    return util.ioQuery('mouse', 'getY');
-	};
+/***/ },
+/* 89 */
+/***/ function(module, exports) {
 
-	Scratch3SensingBlocks.prototype.getMouseDown = function (args, util) {
-	    return util.ioQuery('mouse', 'getIsDown');
+	/**
+	 * @fileoverview
+	 * The specMap below handles a few pieces of "translation" work between
+	 * the SB2 JSON format and the data we need to run a project
+	 * in the Scratch 3.0 VM.
+	 * Notably:
+	 *  - Map 2.0-format opcodes (forward:) into 3.0-format (motion_movesteps).
+	 *  - Map ordered, unnamed args to unordered, named inputs and fields.
+	 * Keep this up-to-date as 3.0 blocks are renamed, changed, etc.
+	 */
+	var specMap = {
+	    'forward:':{
+	        'opcode':'motion_movesteps',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'STEPS'
+	            }
+	        ]
+	    },
+	    'turnRight:':{
+	        'opcode':'motion_turnright',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'DEGREES'
+	            }
+	        ]
+	    },
+	    'turnLeft:':{
+	        'opcode':'motion_turnleft',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'DEGREES'
+	            }
+	        ]
+	    },
+	    'heading:':{
+	        'opcode':'motion_pointindirection',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_angle',
+	                'inputName':'DIRECTION'
+	            }
+	        ]
+	    },
+	    'pointTowards:':{
+	        'opcode':'motion_pointtowards',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'motion_pointtowards_menu',
+	                'inputName':'TOWARDS'
+	            }
+	        ]
+	    },
+	    'gotoX:y:':{
+	        'opcode':'motion_gotoxy',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'X'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'Y'
+	            }
+	        ]
+	    },
+	    'gotoSpriteOrMouse:':{
+	        'opcode':'motion_goto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'motion_goto_menu',
+	                'inputName':'TO'
+	            }
+	        ]
+	    },
+	    'glideSecs:toX:y:elapsed:from:':{
+	        'opcode':'motion_glidesecstoxy',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SECS'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'X'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'Y'
+	            }
+	        ]
+	    },
+	    'changeXposBy:':{
+	        'opcode':'motion_changexby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'DX'
+	            }
+	        ]
+	    },
+	    'xpos:':{
+	        'opcode':'motion_setx',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'X'
+	            }
+	        ]
+	    },
+	    'changeYposBy:':{
+	        'opcode':'motion_changeyby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'DY'
+	            }
+	        ]
+	    },
+	    'ypos:':{
+	        'opcode':'motion_sety',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'Y'
+	            }
+	        ]
+	    },
+	    'bounceOffEdge':{
+	        'opcode':'motion_ifonedgebounce',
+	        'argMap':[
+	        ]
+	    },
+	    'setRotationStyle':{
+	        'opcode':'motion_setrotationstyle',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'motion_setrotationstyle_menu',
+	                'inputName':'STYLE'
+	            }
+	        ]
+	    },
+	    'xpos':{
+	        'opcode':'motion_xposition',
+	        'argMap':[
+	        ]
+	    },
+	    'ypos':{
+	        'opcode':'motion_yposition',
+	        'argMap':[
+	        ]
+	    },
+	    'heading':{
+	        'opcode':'motion_direction',
+	        'argMap':[
+	        ]
+	    },
+	    'say:duration:elapsed:from:':{
+	        'opcode':'looks_sayforsecs',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'MESSAGE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SECS'
+	            }
+	        ]
+	    },
+	    'say:':{
+	        'opcode':'looks_say',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'MESSAGE'
+	            }
+	        ]
+	    },
+	    'think:duration:elapsed:from:':{
+	        'opcode':'looks_thinkforsecs',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'MESSAGE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SECS'
+	            }
+	        ]
+	    },
+	    'think:':{
+	        'opcode':'looks_think',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'MESSAGE'
+	            }
+	        ]
+	    },
+	    'show':{
+	        'opcode':'looks_show',
+	        'argMap':[
+	        ]
+	    },
+	    'hide':{
+	        'opcode':'looks_hide',
+	        'argMap':[
+	        ]
+	    },
+	    'lookLike:':{
+	        'opcode':'looks_switchcostumeto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'looks_costume',
+	                'inputName':'COSTUME'
+	            }
+	        ]
+	    },
+	    'nextCostume':{
+	        'opcode':'looks_nextcostume',
+	        'argMap':[
+	        ]
+	    },
+	    'startScene':{
+	        'opcode':'looks_switchbackdropto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'looks_backdrops',
+	                'inputName':'BACKDROP'
+	            }
+	        ]
+	    },
+	    'changeGraphicEffect:by:':{
+	        'opcode':'looks_changeeffectby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'looks_effectmenu',
+	                'inputName':'EFFECT'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'CHANGE'
+	            }
+	        ]
+	    },
+	    'setGraphicEffect:to:':{
+	        'opcode':'looks_seteffectto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'looks_effectmenu',
+	                'inputName':'EFFECT'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'VALUE'
+	            }
+	        ]
+	    },
+	    'filterReset':{
+	        'opcode':'looks_cleargraphiceffects',
+	        'argMap':[
+	        ]
+	    },
+	    'changeSizeBy:':{
+	        'opcode':'looks_changesizeby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'CHANGE'
+	            }
+	        ]
+	    },
+	    'setSizeTo:':{
+	        'opcode':'looks_setsizeto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SIZE'
+	            }
+	        ]
+	    },
+	    'comeToFront':{
+	        'opcode':'looks_gotofront',
+	        'argMap':[
+	        ]
+	    },
+	    'goBackByLayers:':{
+	        'opcode':'looks_gobacklayers',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_integer',
+	                'inputName':'NUM'
+	            }
+	        ]
+	    },
+	    'costumeIndex':{
+	        'opcode':'looks_costumeorder',
+	        'argMap':[
+	        ]
+	    },
+	    'sceneName':{
+	        'opcode':'looks_backdropname',
+	        'argMap':[
+	        ]
+	    },
+	    'scale':{
+	        'opcode':'looks_size',
+	        'argMap':[
+	        ]
+	    },
+	    'startSceneAndWait':{
+	        'opcode':'looks_switchbackdroptoandwait',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'looks_backdrops',
+	                'inputName':'BACKDROP'
+	            }
+	        ]
+	    },
+	    'nextScene':{
+	        'opcode':'looks_nextbackdrop',
+	        'argMap':[
+	        ]
+	    },
+	    'backgroundIndex':{
+	        'opcode':'looks_backdroporder',
+	        'argMap':[
+	        ]
+	    },
+	    'playSound:':{
+	        'opcode':'sound_play',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sound_sounds_option',
+	                'inputName':'SOUND_MENU'
+	            }
+	        ]
+	    },
+	    'doPlaySoundAndWait':{
+	        'opcode':'sound_playuntildone',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sound_sounds_option',
+	                'inputName':'SOUND_MENU'
+	            }
+	        ]
+	    },
+	    'stopAllSounds':{
+	        'opcode':'sound_stopallsounds',
+	        'argMap':[
+	        ]
+	    },
+	    'playDrum':{
+	        'opcode':'sound_playdrumforbeats',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'DRUMTYPE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'BEATS'
+	            }
+	        ]
+	    },
+	    'rest:elapsed:from:':{
+	        'opcode':'sound_restforbeats',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'BEATS'
+	            }
+	        ]
+	    },
+	    'noteOn:duration:elapsed:from:':{
+	        'opcode':'sound_playnoteforbeats',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NOTE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'BEATS'
+	            }
+	        ]
+	    },
+	    'instrument:':{
+	        'opcode':'sound_setinstrumentto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'INSTRUMENT'
+	            }
+	        ]
+	    },
+	    'changeVolumeBy:':{
+	        'opcode':'sound_changevolumeby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'VOLUME'
+	            }
+	        ]
+	    },
+	    'setVolumeTo:':{
+	        'opcode':'sound_setvolumeto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'VOLUME'
+	            }
+	        ]
+	    },
+	    'volume':{
+	        'opcode':'sound_volume',
+	        'argMap':[
+	        ]
+	    },
+	    'changeTempoBy:':{
+	        'opcode':'sound_changetempoby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'TEMPO'
+	            }
+	        ]
+	    },
+	    'setTempoTo:':{
+	        'opcode':'sound_settempotobpm',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'TEMPO'
+	            }
+	        ]
+	    },
+	    'tempo':{
+	        'opcode':'sound_tempo',
+	        'argMap':[
+	        ]
+	    },
+	    'clearPenTrails':{
+	        'opcode':'pen_clear',
+	        'argMap':[
+	        ]
+	    },
+	    'stampCostume':{
+	        'opcode':'pen_stamp',
+	        'argMap':[
+	        ]
+	    },
+	    'putPenDown':{
+	        'opcode':'pen_pendown',
+	        'argMap':[
+	        ]
+	    },
+	    'putPenUp':{
+	        'opcode':'pen_penup',
+	        'argMap':[
+	        ]
+	    },
+	    'penColor:':{
+	        'opcode':'pen_setpencolortocolor',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'colour_picker',
+	                'inputName':'COLOR'
+	            }
+	        ]
+	    },
+	    'changePenHueBy:':{
+	        'opcode':'pen_changepencolorby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'COLOR'
+	            }
+	        ]
+	    },
+	    'setPenHueTo:':{
+	        'opcode':'pen_setpencolortonum',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'COLOR'
+	            }
+	        ]
+	    },
+	    'changePenShadeBy:':{
+	        'opcode':'pen_changepenshadeby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SHADE'
+	            }
+	        ]
+	    },
+	    'setPenShadeTo:':{
+	        'opcode':'pen_changepenshadeby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SHADE'
+	            }
+	        ]
+	    },
+	    'changePenSizeBy:':{
+	        'opcode':'pen_changepensizeby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SIZE'
+	            }
+	        ]
+	    },
+	    'penSize:':{
+	        'opcode':'pen_setpensizeto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'SIZE'
+	            }
+	        ]
+	    },
+	    'whenGreenFlag':{
+	        'opcode':'event_whenflagclicked',
+	        'argMap':[
+	        ]
+	    },
+	    'whenKeyPressed':{
+	        'opcode':'event_whenkeypressed',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'KEY_OPTION'
+	            }
+	        ]
+	    },
+	    'whenClicked':{
+	        'opcode':'event_whenthisspriteclicked',
+	        'argMap':[
+	        ]
+	    },
+	    'whenSceneStarts':{
+	        'opcode':'event_whenbackdropswitchesto',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'BACKDROP'
+	            }
+	        ]
+	    },
+	    'whenSensorGreaterThan':{
+	        'opcode':'event_whengreaterthan',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'WHENGREATERTHANMENU'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'VALUE'
+	            }
+	        ]
+	    },
+	    'whenIReceive':{
+	        'opcode':'event_whenbroadcastreceived',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'BROADCAST_OPTION'
+	            }
+	        ]
+	    },
+	    'broadcast:':{
+	        'opcode':'event_broadcast',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'BROADCAST_OPTION'
+	            }
+	        ]
+	    },
+	    'doBroadcastAndWait':{
+	        'opcode':'event_broadcastandwait',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'BROADCAST_OPTION'
+	            }
+	        ]
+	    },
+	    'wait:elapsed:from:':{
+	        'opcode':'control_wait',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_positive_number',
+	                'inputName':'DURATION'
+	            }
+	        ]
+	    },
+	    'doRepeat':{
+	        'opcode':'control_repeat',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_whole_number',
+	                'inputName':'TIMES'
+	            },
+	            {
+	                'type':'input',
+	                'inputName': 'SUBSTACK'
+	            }
+	        ]
+	    },
+	    'doForever':{
+	        'opcode':'control_forever',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'SUBSTACK'
+	            }
+	        ]
+	    },
+	    'doIf':{
+	        'opcode':'control_if',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'CONDITION'
+	            },
+	            {
+	                'type':'input',
+	                'inputName':'SUBSTACK'
+	            }
+	        ]
+	    },
+	    'doIfElse':{
+	        'opcode':'control_if_else',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'CONDITION'
+	            },
+	            {
+	                'type':'input',
+	                'inputName':'SUBSTACK'
+	            },
+	            {
+	                'type':'input',
+	                'inputName':'SUBSTACK2'
+	            }
+	        ]
+	    },
+	    'doWaitUntil':{
+	        'opcode':'control_wait_until',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'CONDITION'
+	            }
+	        ]
+	    },
+	    'doUntil':{
+	        'opcode':'control_repeat_until',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'CONDITION'
+	            },
+	            {
+	                'type':'input',
+	                'inputName':'SUBSTACK'
+	            }
+	        ]
+	    },
+	    'stopScripts':{
+	        'opcode':'control_stop',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'control_stop_menu',
+	                'inputName':'STOP_OPTION'
+	            }
+	        ]
+	    },
+	    'whenCloned':{
+	        'opcode':'control_start_as_clone',
+	        'argMap':[
+	        ]
+	    },
+	    'createCloneOf':{
+	        'opcode':'control_create_clone_of',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'control_create_clone_of_menu',
+	                'inputName':'CLONE_OPTION'
+	            }
+	        ]
+	    },
+	    'deleteClone':{
+	        'opcode':'control_delete_this_clone',
+	        'argMap':[
+	        ]
+	    },
+	    'touching:':{
+	        'opcode':'sensing_touchingobject',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_touchingobjectmenu',
+	                'inputName':'TOUCHINGOBJECTMENU'
+	            }
+	        ]
+	    },
+	    'touchingColor:':{
+	        'opcode':'sensing_touchingcolor',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'colour_picker',
+	                'inputName':'COLOR'
+	            }
+	        ]
+	    },
+	    'color:sees:':{
+	        'opcode':'sensing_coloristouchingcolor',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'colour_picker',
+	                'inputName':'COLOR'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'colour_picker',
+	                'inputName':'COLOR2'
+	            }
+	        ]
+	    },
+	    'distanceTo:':{
+	        'opcode':'sensing_distanceto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_distancetomenu',
+	                'inputName':'DISTANCETOMENU'
+	            }
+	        ]
+	    },
+	    'doAsk':{
+	        'opcode':'sensing_askandwait',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'QUESTION'
+	            }
+	        ]
+	    },
+	    'answer':{
+	        'opcode':'sensing_answer',
+	        'argMap':[
+	        ]
+	    },
+	    'keyPressed:':{
+	        'opcode':'sensing_keypressed',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_keyoptions',
+	                'inputName':'KEY_OPTION'
+	            }
+	        ]
+	    },
+	    'mousePressed':{
+	        'opcode':'sensing_mousedown',
+	        'argMap':[
+	        ]
+	    },
+	    'mouseX':{
+	        'opcode':'sensing_mousex',
+	        'argMap':[
+	        ]
+	    },
+	    'mouseY':{
+	        'opcode':'sensing_mousey',
+	        'argMap':[
+	        ]
+	    },
+	    'soundLevel':{
+	        'opcode':'sensing_loudness',
+	        'argMap':[
+	        ]
+	    },
+	    'senseVideoMotion':{
+	        'opcode':'sensing_videoon',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_videoonmenuone',
+	                'inputName':'VIDEOONMENU1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_videoonmenutwo',
+	                'inputName':'VIDEOONMENU2'
+	            }
+	        ]
+	    },
+	    'setVideoState':{
+	        'opcode':'sensing_videotoggle',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_videotogglemenu',
+	                'inputName':'VIDEOTOGGLEMENU'
+	            }
+	        ]
+	    },
+	    'setVideoTransparency':{
+	        'opcode':'sensing_setvideotransparency',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'TRANSPARENCY'
+	            }
+	        ]
+	    },
+	    'timer':{
+	        'opcode':'sensing_timer',
+	        'argMap':[
+	        ]
+	    },
+	    'timerReset':{
+	        'opcode':'sensing_resettimer',
+	        'argMap':[
+	        ]
+	    },
+	    'getAttribute:of:':{
+	        'opcode':'sensing_of',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_ofattributemenu',
+	                'inputName':'ATTRIBUTE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_ofobjectmenu',
+	                'inputName':'OBJECT'
+	            }
+	        ]
+	    },
+	    'timeAndDate':{
+	        'opcode':'sensing_current',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'sensing_currentmenu',
+	                'inputName':'CURRENTMENU'
+	            }
+	        ]
+	    },
+	    'timestamp':{
+	        'opcode':'sensing_dayssince2000',
+	        'argMap':[
+	        ]
+	    },
+	    'getUserName':{
+	        'opcode':'sensing_username',
+	        'argMap':[
+	        ]
+	    },
+	    '+':{
+	        'opcode':'operator_add',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM2'
+	            }
+	        ]
+	    },
+	    '-':{
+	        'opcode':'operator_subtract',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM2'
+	            }
+	        ]
+	    },
+	    '*':{
+	        'opcode':'operator_multiply',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM2'
+	            }
+	        ]
+	    },
+	    '/':{
+	        'opcode':'operator_divide',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM2'
+	            }
+	        ]
+	    },
+	    'randomFrom:to:':{
+	        'opcode':'operator_random',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'FROM'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'TO'
+	            }
+	        ]
+	    },
+	    '<':{
+	        'opcode':'operator_lt',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'OPERAND1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'OPERAND2'
+	            }
+	        ]
+	    },
+	    '=':{
+	        'opcode':'operator_equals',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'OPERAND1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'OPERAND2'
+	            }
+	        ]
+	    },
+	    '>':{
+	        'opcode':'operator_gt',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'OPERAND1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'OPERAND2'
+	            }
+	        ]
+	    },
+	    '&':{
+	        'opcode':'operator_and',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'OPERAND1'
+	            },
+	            {
+	                'type':'input',
+	                'inputName':'OPERAND2'
+	            }
+	        ]
+	    },
+	    '|':{
+	        'opcode':'operator_or',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'OPERAND1'
+	            },
+	            {
+	                'type':'input',
+	                'inputName':'OPERAND2'
+	            }
+	        ]
+	    },
+	    'not':{
+	        'opcode':'operator_not',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputName':'OPERAND'
+	            }
+	        ]
+	    },
+	    'concatenate:with:':{
+	        'opcode':'operator_join',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'STRING1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'STRING2'
+	            }
+	        ]
+	    },
+	    'letter:of:':{
+	        'opcode':'operator_letter_of',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_whole_number',
+	                'inputName':'LETTER'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'STRING'
+	            }
+	        ]
+	    },
+	    'stringLength:':{
+	        'opcode':'operator_length',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'STRING'
+	            }
+	        ]
+	    },
+	    '%':{
+	        'opcode':'operator_mod',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM1'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM2'
+	            }
+	        ]
+	    },
+	    'rounded':{
+	        'opcode':'operator_round',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM'
+	            }
+	        ]
+	    },
+	    'computeFunction:of:':{
+	        'opcode':'operator_mathop',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'operator_mathop_menu',
+	                'inputName':'OPERATOR'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'NUM'
+	            }
+	        ]
+	    },
+	    'readVariable':{
+	        'opcode':'data_variable',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'data_variablemenu',
+	                'inputName':'VARIABLE'
+	            }
+	        ]
+	    },
+	    'setVar:to:':{
+	        'opcode':'data_setvariableto',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'data_variablemenu',
+	                'inputName':'VARIABLE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'VALUE'
+	            }
+	        ]
+	    },
+	    'changeVar:by:':{
+	        'opcode':'data_changevariableby',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'data_variablemenu',
+	                'inputName':'VARIABLE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'math_number',
+	                'inputName':'VALUE'
+	            }
+	        ]
+	    },
+	    'showVariable:':{
+	        'opcode':'data_showvariable',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'data_variablemenu',
+	                'inputName':'VARIABLE'
+	            }
+	        ]
+	    },
+	    'hideVariable:':{
+	        'opcode':'data_hidevariable',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'data_variablemenu',
+	                'inputName':'VARIABLE'
+	            }
+	        ]
+	    },
+	    'append:toList:':{
+	        'opcode':'data_listadd',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'VALUE'
+	            },
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            }
+	        ]
+	    },
+	    'deleteLine:ofList:':{
+	        'opcode':'data_listdelete',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'LINE'
+	            },
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            }
+	        ]
+	    },
+	    'insert:at:ofList:':{
+	        'opcode':'data_listinsert',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'VALUE'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'LINE'
+	            },
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            }
+	        ]
+	    },
+	    'setLine:ofList:to:':{
+	        'opcode':'data_listreplace',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'LINE'
+	            },
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'VALUE'
+	            }
+	        ]
+	    },
+	    'getLine:ofList:':{
+	        'opcode':'data_listitem',
+	        'argMap':[
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'LINE'
+	            },
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            }
+	        ]
+	    },
+	    'lineCountOfList:':{
+	        'opcode':'data_listlength',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            }
+	        ]
+	    },
+	    'list:contains:':{
+	        'opcode':'data_listcontains',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            },
+	            {
+	                'type':'input',
+	                'inputOp':'text',
+	                'inputName':'VALUE'
+	            }
+	        ]
+	    },
+	    'showList:':{
+	        'opcode':'data_showlist',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            }
+	        ]
+	    },
+	    'hideList:':{
+	        'opcode':'data_hidelist',
+	        'argMap':[
+	            {
+	                'type':'field',
+	                'fieldName':'LIST'
+	            }
+	        ]
+	    },
+	    'procDef':{
+	        'opcode':'proc_def',
+	        'argMap':[]
+	    },
+	    'getParam':{
+	        'opcode':'proc_param',
+	        'argMap':[]
+	    },
+	    'call':{
+	        'opcode':'proc_call',
+	        'argMap':[]
+	    }
 	};
-
-	module.exports = Scratch3SensingBlocks;
+	module.exports = specMap;
 
 
 /***/ }
diff --git a/vm.min.js b/vm.min.js
index 3b039864..ce44c751 100644
--- a/vm.min.js
+++ b/vm.min.js
@@ -1,11 +1,11 @@
-!function(t){function e(n){if(r[n])return r[n].exports;var i=r[n]={exports:{},id:n,loaded:!1};return t[n].call(i.exports,i,i.exports,e),i.loaded=!0,i.exports}var r={};return e.m=t,e.c=r,e.p="",e(0)}([function(t,e,r){function n(){var t=this;i.call(t);var e=new s;e.createClone();var r=[e.clones[0]];t.exampleSprite=e,t.runtime=new a(r),t.blockListener=e.blocks.generateBlockListener(!1,t.runtime),t.flyoutBlockListener=e.blocks.generateBlockListener(!0,t.runtime),t.runtime.on(a.STACK_GLOW_ON,function(e){t.emit(a.STACK_GLOW_ON,{id:e})}),t.runtime.on(a.STACK_GLOW_OFF,function(e){t.emit(a.STACK_GLOW_OFF,{id:e})}),t.runtime.on(a.BLOCK_GLOW_ON,function(e){t.emit(a.BLOCK_GLOW_ON,{id:e})}),t.runtime.on(a.BLOCK_GLOW_OFF,function(e){t.emit(a.BLOCK_GLOW_OFF,{id:e})}),t.runtime.on(a.VISUAL_REPORT,function(e,r){t.emit(a.VISUAL_REPORT,{id:e,value:r})})}var i=r(1),o=r(2),s=r(6),a=r(61),c="function"==typeof importScripts;o.inherits(n,i),n.prototype.start=function(){this.runtime.start()},n.prototype.greenFlag=function(){this.runtime.greenFlag()},n.prototype.stopAll=function(){this.runtime.stopAll()},n.prototype.getPlaygroundData=function(){this.emit("playgroundData",{blocks:this.exampleSprite.blocks,threads:this.runtime.threads})},n.prototype.animationFrame=function(){this.runtime.animationFrame()},n.prototype.postIOData=function(t,e){this.runtime.ioDevices[t]&&this.runtime.ioDevices[t].postData(e)},c&&(self.importScripts("./node_modules/scratch-render/render-worker.js"),self.renderer=new self.RenderWebGLWorker,self.vmInstance=new n,self.onmessage=function(t){var e=t.data;switch(e.method){case"start":self.vmInstance.runtime.start();break;case"greenFlag":self.vmInstance.runtime.greenFlag();break;case"stopAll":self.vmInstance.runtime.stopAll();break;case"blockListener":self.vmInstance.blockListener(e.args);break;case"flyoutBlockListener":self.vmInstance.flyoutBlockListener(e.args);break;case"getPlaygroundData":self.postMessage({method:"playgroundData",blocks:self.vmInstance.exampleSprite.blocks,threads:self.vmInstance.runtime.threads});break;case"animationFrame":self.vmInstance.animationFrame();break;case"postIOData":self.vmInstance.postIOData(e.device,e.data);break;default:"RendererConnected"==t.data.id,self.renderer.onmessage(t)}},self.vmInstance.runtime.on(a.STACK_GLOW_ON,function(t){self.postMessage({method:a.STACK_GLOW_ON,id:t})}),self.vmInstance.runtime.on(a.STACK_GLOW_OFF,function(t){self.postMessage({method:a.STACK_GLOW_OFF,id:t})}),self.vmInstance.runtime.on(a.BLOCK_GLOW_ON,function(t){self.postMessage({method:a.BLOCK_GLOW_ON,id:t})}),self.vmInstance.runtime.on(a.BLOCK_GLOW_OFF,function(t){self.postMessage({method:a.BLOCK_GLOW_OFF,id:t})}),self.vmInstance.runtime.on(a.VISUAL_REPORT,function(t,e){self.postMessage({method:a.VISUAL_REPORT,id:t,value:e})})),t.exports=n,"undefined"!=typeof window&&(window.VirtualMachine=t.exports)},function(t,e){function r(){this._events=this._events||{},this._maxListeners=this._maxListeners||void 0}function n(t){return"function"==typeof t}function i(t){return"number"==typeof t}function o(t){return"object"==typeof t&&null!==t}function s(t){return void 0===t}t.exports=r,r.EventEmitter=r,r.prototype._events=void 0,r.prototype._maxListeners=void 0,r.defaultMaxListeners=10,r.prototype.setMaxListeners=function(t){if(!i(t)||0>t||isNaN(t))throw TypeError("n must be a positive number");return this._maxListeners=t,this},r.prototype.emit=function(t){var e,r,i,a,c,u;if(this._events||(this._events={}),"error"===t&&(!this._events.error||o(this._events.error)&&!this._events.error.length)){if(e=arguments[1],e instanceof Error)throw e;throw TypeError('Uncaught, unspecified "error" event.')}if(r=this._events[t],s(r))return!1;if(n(r))switch(arguments.length){case 1:r.call(this);break;case 2:r.call(this,arguments[1]);break;case 3:r.call(this,arguments[1],arguments[2]);break;default:a=Array.prototype.slice.call(arguments,1),r.apply(this,a)}else if(o(r))for(a=Array.prototype.slice.call(arguments,1),u=r.slice(),i=u.length,c=0;i>c;c++)u[c].apply(this,a);return!0},r.prototype.addListener=function(t,e){var i;if(!n(e))throw TypeError("listener must be a function");return this._events||(this._events={}),this._events.newListener&&this.emit("newListener",t,n(e.listener)?e.listener:e),this._events[t]?o(this._events[t])?this._events[t].push(e):this._events[t]=[this._events[t],e]:this._events[t]=e,o(this._events[t])&&!this._events[t].warned&&(i=s(this._maxListeners)?r.defaultMaxListeners:this._maxListeners,i&&i>0&&this._events[t].length>i&&(this._events[t].warned=!0,console.error("(node) warning: possible EventEmitter memory leak detected. %d listeners added. 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t=this._buffer.substring(this._sectionStart+1,this._index),e=this._xmlMode?l:u;e.hasOwnProperty(t)&&(this._emitPartial(e[t]),this._sectionStart=this._index+1)}},a.prototype._parseLegacyEntity=function(){var t=this._sectionStart+1,e=this._index-t;for(e>6&&(e=6);e>=2;){var r=this._buffer.substr(t,e);if(h.hasOwnProperty(r))return this._emitPartial(h[r]),void(this._sectionStart+=e+1);e--}},a.prototype._stateInNamedEntity=function(t){";"===t?(this._parseNamedEntityStrict(),this._sectionStart+1<this._index&&!this._xmlMode&&this._parseLegacyEntity(),this._state=this._baseState):("a">t||t>"z")&&("A">t||t>"Z")&&("0">t||t>"9")&&(this._xmlMode||this._sectionStart+1===this._index||(this._baseState!==f?"="!==t&&this._parseNamedEntityStrict():this._parseLegacyEntity()),this._state=this._baseState,this._index--)},a.prototype._decodeNumericEntity=function(t,e){var r=this._sectionStart+t;if(r!==this._index){var n=this._buffer.substring(r,this._index),i=parseInt(n,e);this._emitPartial(c(i)),this._sectionStart=this._index}else 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t=this._buffer.charAt(this._index);this._state===f?this._stateText(t):this._state===d?this._stateBeforeTagName(t):this._state===g?this._stateInTagName(t):this._state===m?this._stateBeforeCloseingTagName(t):this._state===b?this._stateInCloseingTagName(t):this._state===y?this._stateAfterCloseingTagName(t):this._state===_?this._stateInSelfClosingTag(t):this._state===v?this._stateBeforeAttributeName(t):this._state===w?this._stateInAttributeName(t):this._state===S?this._stateAfterAttributeName(t):this._state===E?this._stateBeforeAttributeValue(t):this._state===k?this._stateInAttributeValueDoubleQuotes(t):this._state===x?this._stateInAttributeValueSingleQuotes(t):this._state===T?this._stateInAttributeValueNoQuotes(t):this._state===A?this._stateBeforeDeclaration(t):this._state===L?this._stateInDeclaration(t):this._state===I?this._stateInProcessingInstruction(t):this._state===D?this._stateBeforeComment(t):this._state===R?this._stateInComment(t):this._state===N?this._stateAfterComment1(t):this._state===O?this._stateAfterComment2(t):this._state===B?this._stateBeforeCdata1(t):this._state===C?this._stateBeforeCdata2(t):this._state===M?this._stateBeforeCdata3(t):this._state===q?this._stateBeforeCdata4(t):this._state===P?this._stateBeforeCdata5(t):this._state===U?this._stateBeforeCdata6(t):this._state===F?this._stateInCdata(t):this._state===j?this._stateAfterCdata1(t):this._state===G?this._stateAfterCdata2(t):this._state===Y?this._stateBeforeSpecial(t):this._state===V?this._stateBeforeSpecialEnd(t):this._state===z?this._stateBeforeScript1(t):this._state===H?this._stateBeforeScript2(t):this._state===W?this._stateBeforeScript3(t):this._state===X?this._stateBeforeScript4(t):this._state===K?this._stateBeforeScript5(t):this._state===J?this._stateAfterScript1(t):this._state===Q?this._stateAfterScript2(t):this._state===Z?this._stateAfterScript3(t):this._state===$?this._stateAfterScript4(t):this._state===tt?this._stateAfterScript5(t):this._state===et?this._stateBeforeStyle1(t):this._state===rt?this._stateBeforeStyle2(t):this._state===nt?this._stateBeforeStyle3(t):this._state===it?this._stateBeforeStyle4(t):this._state===ot?this._stateAfterStyle1(t):this._state===st?this._stateAfterStyle2(t):this._state===at?this._stateAfterStyle3(t):this._state===ct?this._stateAfterStyle4(t):this._state===ut?this._stateBeforeEntity(t):this._state===ht?this._stateBeforeNumericEntity(t):this._state===lt?this._stateInNamedEntity(t):this._state===pt?this._stateInNumericEntity(t):this._state===ft?this._stateInHexEntity(t):this._cbs.onerror(Error("unknown 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t=this._buffer.substr(this._sectionStart);this._state===F||this._state===j||this._state===G?this._cbs.oncdata(t):this._state===R||this._state===N||this._state===O?this._cbs.oncomment(t):this._state!==lt||this._xmlMode?this._state!==pt||this._xmlMode?this._state!==ft||this._xmlMode?this._state!==g&&this._state!==v&&this._state!==E&&this._state!==S&&this._state!==w&&this._state!==x&&this._state!==k&&this._state!==T&&this._state!==b&&this._cbs.ontext(t):(this._decodeNumericEntity(3,16),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData())):(this._decodeNumericEntity(2,10),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData())):(this._parseLegacyEntity(),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData()))},a.prototype.reset=function(){a.call(this,{xmlMode:this._xmlMode,decodeEntities:this._decodeEntities},this._cbs)},a.prototype.getAbsoluteIndex=function(){return this._bufferOffset+this._index},a.prototype._getSection=function(){return this._buffer.substring(this._sectionStart,this._index)},a.prototype._emitToken=function(t){this._cbs[t](this._getSection()),this._sectionStart=-1},a.prototype._emitPartial=function(t){this._baseState!==f?this._cbs.onattribdata(t):this._cbs.ontext(t)}},function(t,e,r){function n(t){if(t>=55296&&57343>=t||t>1114111)return"�";t in i&&(t=i[t]);var e="";return t>65535&&(t-=65536,e+=String.fromCharCode(t>>>10&1023|55296),t=56320|1023&t),e+=String.fromCharCode(t)}var i=r(16);t.exports=n},function(t,e){t.exports={0:65533,128:8364,130:8218,131:402,132:8222,133:8230,134:8224,135:8225,136:710,137:8240,138:352,139:8249,140:338,142:381,145:8216,146:8217,147:8220,148:8221,149:8226,150:8211,151:8212,152:732,153:8482,154:353,155:8250,156:339,158:382,159:376}},function(t,e){t.exports={Aacute:"Á",aacute:"á",Abreve:"Ă",abreve:"ă",ac:"∾",acd:"∿",acE:"∾̳",Acirc:"Â",acirc:"â",acute:"´",Acy:"А",acy:"а",AElig:"Æ",aelig:"æ",af:"⁡",Afr:"𝔄",afr:"𝔞",Agrave:"À",agrave:"à",alefsym:"ℵ",aleph:"ℵ",Alpha:"Α",alpha:"α",Amacr:"Ā",amacr:"ā",amalg:"⨿",amp:"&",AMP:"&",andand:"⩕",And:"⩓",and:"∧",andd:"⩜",andslope:"⩘",andv:"⩚",ang:"∠",ange:"⦤",angle:"∠",angmsdaa:"⦨",angmsdab:"⦩",angmsdac:"⦪",angmsdad:"⦫",angmsdae:"⦬",angmsdaf:"⦭",angmsdag:"⦮",angmsdah:"⦯",angmsd:"∡",angrt:"∟",angrtvb:"⊾",angrtvbd:"⦝",angsph:"∢",angst:"Å",angzarr:"⍼",Aogon:"Ą",aogon:"ą",Aopf:"𝔸",aopf:"𝕒",apacir:"⩯",ap:"≈",apE:"⩰",ape:"≊",apid:"≋",apos:"'",ApplyFunction:"⁡",approx:"≈",approxeq:"≊",Aring:"Å",aring:"å",Ascr:"𝒜",ascr:"𝒶",Assign:"≔",ast:"*",asymp:"≈",asympeq:"≍",Atilde:"Ã",atilde:"ã",Auml:"Ä",auml:"ä",awconint:"∳",awint:"⨑",backcong:"≌",backepsilon:"϶",backprime:"‵",backsim:"∽",backsimeq:"⋍",Backslash:"∖",Barv:"⫧",barvee:"⊽",barwed:"⌅",Barwed:"⌆",barwedge:"⌅",bbrk:"⎵",bbrktbrk:"⎶",bcong:"≌",Bcy:"Б",bcy:"б",bdquo:"„",becaus:"∵",because:"∵",Because:"∵",bemptyv:"⦰",bepsi:"϶",bernou:"ℬ",Bernoullis:"ℬ",Beta:"Β",beta:"β",beth:"ℶ",between:"≬",Bfr:"𝔅",bfr:"𝔟",bigcap:"⋂",bigcirc:"◯",bigcup:"⋃",bigodot:"⨀",bigoplus:"⨁",bigotimes:"⨂",bigsqcup:"⨆",bigstar:"★",bigtriangledown:"▽",bigtriangleup:"△",biguplus:"⨄",bigvee:"⋁",bigwedge:"⋀",bkarow:"⤍",blacklozenge:"⧫",blacksquare:"▪",blacktriangle:"▴",blacktriangledown:"▾",blacktriangleleft:"◂",blacktriangleright:"▸",blank:"␣",blk12:"▒",blk14:"░",blk34:"▓",block:"█",bne:"=⃥",bnequiv:"≡⃥",bNot:"⫭",bnot:"⌐",Bopf:"𝔹",bopf:"𝕓",bot:"⊥",bottom:"⊥",bowtie:"⋈",boxbox:"⧉",boxdl:"┐",boxdL:"╕",boxDl:"╖",boxDL:"╗",boxdr:"┌",boxdR:"╒",boxDr:"╓",boxDR:"╔",boxh:"─",boxH:"═",boxhd:"┬",boxHd:"╤",boxhD:"╥",boxHD:"╦",boxhu:"┴",boxHu:"╧",boxhU:"╨",boxHU:"╩",boxminus:"⊟",boxplus:"⊞",boxtimes:"⊠",boxul:"┘",boxuL:"╛",boxUl:"╜",boxUL:"╝",boxur:"└",boxuR:"╘",boxUr:"╙",boxUR:"╚",boxv:"│",boxV:"║",boxvh:"┼",boxvH:"╪",boxVh:"╫",boxVH:"╬",boxvl:"┤",boxvL:"╡",boxVl:"╢",boxVL:"╣",boxvr:"├",boxvR:"╞",boxVr:"╟",boxVR:"╠",bprime:"‵",breve:"˘",Breve:"˘",brvbar:"¦",bscr:"𝒷",Bscr:"ℬ",bsemi:"⁏",bsim:"∽",bsime:"⋍",bsolb:"⧅",bsol:"\\",bsolhsub:"⟈",bull:"•",bullet:"•",bump:"≎",bumpE:"⪮",bumpe:"≏",Bumpeq:"≎",bumpeq:"≏",Cacute:"Ć",cacute:"ć",capand:"⩄",capbrcup:"⩉",capcap:"⩋",cap:"∩",Cap:"⋒",capcup:"⩇",capdot:"⩀",CapitalDifferentialD:"ⅅ",caps:"∩︀",caret:"⁁",caron:"ˇ",Cayleys:"ℭ",ccaps:"⩍",Ccaron:"Č",ccaron:"č",Ccedil:"Ç",ccedil:"ç",Ccirc:"Ĉ",ccirc:"ĉ",Cconint:"∰",ccups:"⩌",ccupssm:"⩐",Cdot:"Ċ",cdot:"ċ",cedil:"¸",Cedilla:"¸",cemptyv:"⦲",cent:"¢",centerdot:"·",CenterDot:"·",cfr:"𝔠",Cfr:"ℭ",CHcy:"Ч",chcy:"ч",check:"✓",checkmark:"✓",Chi:"Χ",chi:"χ",circ:"ˆ",circeq:"≗",circlearrowleft:"↺",circlearrowright:"↻",circledast:"⊛",circledcirc:"⊚",circleddash:"⊝",CircleDot:"⊙",circledR:"®",circledS:"Ⓢ",CircleMinus:"⊖",CirclePlus:"⊕",CircleTimes:"⊗",cir:"○",cirE:"⧃",cire:"≗",cirfnint:"⨐",cirmid:"⫯",cirscir:"⧂",ClockwiseContourIntegral:"∲",CloseCurlyDoubleQuote:"”",CloseCurlyQuote:"’",clubs:"♣",clubsuit:"♣",colon:":",Colon:"∷",Colone:"⩴",colone:"≔",coloneq:"≔",comma:",",commat:"@",comp:"∁",compfn:"∘",complement:"∁",complexes:"ℂ",cong:"≅",congdot:"⩭",Congruent:"≡",conint:"∮",Conint:"∯",ContourIntegral:"∮",copf:"𝕔",Copf:"ℂ",coprod:"∐",Coproduct:"∐",copy:"©",COPY:"©",copysr:"℗",CounterClockwiseContourIntegral:"∳",crarr:"↵",cross:"✗",Cross:"⨯",Cscr:"𝒞",cscr:"𝒸",csub:"⫏",csube:"⫑",csup:"⫐",csupe:"⫒",ctdot:"⋯",cudarrl:"⤸",cudarrr:"⤵",cuepr:"⋞",cuesc:"⋟",cularr:"↶",cularrp:"⤽",cupbrcap:"⩈",cupcap:"⩆",CupCap:"≍",cup:"∪",Cup:"⋓",cupcup:"⩊",cupdot:"⊍",cupor:"⩅",cups:"∪︀",curarr:"↷",curarrm:"⤼",curlyeqprec:"⋞",curlyeqsucc:"⋟",curlyvee:"⋎",curlywedge:"⋏",curren:"¤",curvearrowleft:"↶",curvearrowright:"↷",cuvee:"⋎",cuwed:"⋏",cwconint:"∲",cwint:"∱",cylcty:"⌭",dagger:"†",Dagger:"‡",daleth:"ℸ",darr:"↓",Darr:"↡",dArr:"⇓",dash:"‐",Dashv:"⫤",dashv:"⊣",dbkarow:"⤏",dblac:"˝",Dcaron:"Ď",dcaron:"ď",Dcy:"Д",dcy:"д",ddagger:"‡",ddarr:"⇊",DD:"ⅅ",dd:"ⅆ",DDotrahd:"⤑",ddotseq:"⩷",deg:"°",Del:"∇",Delta:"Δ",delta:"δ",demptyv:"⦱",dfisht:"⥿",Dfr:"𝔇",dfr:"𝔡",dHar:"⥥",dharl:"⇃",dharr:"⇂",DiacriticalAcute:"´",DiacriticalDot:"˙",DiacriticalDoubleAcute:"˝",DiacriticalGrave:"`",DiacriticalTilde:"˜",diam:"⋄",diamond:"⋄",Diamond:"⋄",diamondsuit:"♦",diams:"♦",die:"¨",DifferentialD:"ⅆ",digamma:"ϝ",disin:"⋲",div:"÷",divide:"÷",divideontimes:"⋇",divonx:"⋇",DJcy:"Ђ",djcy:"ђ",dlcorn:"⌞",dlcrop:"⌍",dollar:"$",Dopf:"𝔻",dopf:"𝕕",Dot:"¨",dot:"˙",DotDot:"⃜",doteq:"≐",doteqdot:"≑",DotEqual:"≐",dotminus:"∸",dotplus:"∔",dotsquare:"⊡",doublebarwedge:"⌆",DoubleContourIntegral:"∯",DoubleDot:"¨",DoubleDownArrow:"⇓",DoubleLeftArrow:"⇐",DoubleLeftRightArrow:"⇔",DoubleLeftTee:"⫤",DoubleLongLeftArrow:"⟸",DoubleLongLeftRightArrow:"⟺",DoubleLongRightArrow:"⟹",DoubleRightArrow:"⇒",DoubleRightTee:"⊨",DoubleUpArrow:"⇑",DoubleUpDownArrow:"⇕",DoubleVerticalBar:"∥",DownArrowBar:"⤓",downarrow:"↓",DownArrow:"↓",Downarrow:"⇓",DownArrowUpArrow:"⇵",DownBreve:"̑",downdownarrows:"⇊",downharpoonleft:"⇃",downharpoonright:"⇂",DownLeftRightVector:"⥐",DownLeftTeeVector:"⥞",DownLeftVectorBar:"⥖",DownLeftVector:"↽",DownRightTeeVector:"⥟",DownRightVectorBar:"⥗",DownRightVector:"⇁",DownTeeArrow:"↧",DownTee:"⊤",drbkarow:"⤐",drcorn:"⌟",drcrop:"⌌",Dscr:"𝒟",dscr:"𝒹",DScy:"Ѕ",dscy:"ѕ",dsol:"⧶",Dstrok:"Đ",dstrok:"đ",dtdot:"⋱",dtri:"▿",dtrif:"▾",duarr:"⇵",duhar:"⥯",dwangle:"⦦",DZcy:"Џ",dzcy:"џ",dzigrarr:"⟿",Eacute:"É",eacute:"é",easter:"⩮",Ecaron:"Ě",ecaron:"ě",Ecirc:"Ê",ecirc:"ê",ecir:"≖",ecolon:"≕",Ecy:"Э",ecy:"э",eDDot:"⩷",Edot:"Ė",edot:"ė",eDot:"≑",ee:"ⅇ",efDot:"≒",Efr:"𝔈",efr:"𝔢",eg:"⪚",Egrave:"È",egrave:"è",egs:"⪖",egsdot:"⪘",el:"⪙",Element:"∈",elinters:"⏧",ell:"ℓ",els:"⪕",elsdot:"⪗",Emacr:"Ē",emacr:"ē",empty:"∅",emptyset:"∅",EmptySmallSquare:"◻",emptyv:"∅",EmptyVerySmallSquare:"▫",emsp13:" ",emsp14:" ",emsp:" ",ENG:"Ŋ",eng:"ŋ",ensp:" ",Eogon:"Ę",eogon:"ę",Eopf:"𝔼",eopf:"𝕖",epar:"⋕",eparsl:"⧣",eplus:"⩱",epsi:"ε",Epsilon:"Ε",epsilon:"ε",epsiv:"ϵ",eqcirc:"≖",eqcolon:"≕",eqsim:"≂",eqslantgtr:"⪖",eqslantless:"⪕",Equal:"⩵",equals:"=",EqualTilde:"≂",equest:"≟",Equilibrium:"⇌",equiv:"≡",equivDD:"⩸",eqvparsl:"⧥",erarr:"⥱",erDot:"≓",escr:"ℯ",Escr:"ℰ",esdot:"≐",Esim:"⩳",esim:"≂",Eta:"Η",eta:"η",ETH:"Ð",eth:"ð",Euml:"Ë",euml:"ë",euro:"€",excl:"!",exist:"∃",Exists:"∃",expectation:"ℰ",exponentiale:"ⅇ",ExponentialE:"ⅇ",fallingdotseq:"≒",Fcy:"Ф",fcy:"ф",female:"♀",ffilig:"ffi",fflig:"ff",ffllig:"ffl",Ffr:"𝔉",ffr:"𝔣",filig:"fi",FilledSmallSquare:"◼",FilledVerySmallSquare:"▪",fjlig:"fj",flat:"♭",fllig:"fl",fltns:"▱",fnof:"ƒ",Fopf:"𝔽",fopf:"𝕗",forall:"∀",ForAll:"∀",fork:"⋔",forkv:"⫙",Fouriertrf:"ℱ",fpartint:"⨍",frac12:"½",frac13:"⅓",frac14:"¼",frac15:"⅕",frac16:"⅙",frac18:"⅛",frac23:"⅔",frac25:"⅖",frac34:"¾",frac35:"⅗",frac38:"⅜",frac45:"⅘",frac56:"⅚",frac58:"⅝",frac78:"⅞",frasl:"⁄",frown:"⌢",fscr:"𝒻",Fscr:"ℱ",gacute:"ǵ",Gamma:"Γ",gamma:"γ",Gammad:"Ϝ",gammad:"ϝ",gap:"⪆",Gbreve:"Ğ",gbreve:"ğ",Gcedil:"Ģ",Gcirc:"Ĝ",gcirc:"ĝ",Gcy:"Г",gcy:"г",Gdot:"Ġ",gdot:"ġ",ge:"≥",gE:"≧",gEl:"⪌",gel:"⋛",geq:"≥",geqq:"≧",geqslant:"⩾",gescc:"⪩",ges:"⩾",gesdot:"⪀",gesdoto:"⪂",gesdotol:"⪄",gesl:"⋛︀",gesles:"⪔",Gfr:"𝔊",gfr:"𝔤",gg:"≫",Gg:"⋙",ggg:"⋙",gimel:"ℷ",GJcy:"Ѓ",gjcy:"ѓ",gla:"⪥",gl:"≷",glE:"⪒",glj:"⪤",gnap:"⪊",gnapprox:"⪊",gne:"⪈",gnE:"≩",gneq:"⪈",gneqq:"≩",gnsim:"⋧",Gopf:"𝔾",gopf:"𝕘",grave:"`",GreaterEqual:"≥",GreaterEqualLess:"⋛",GreaterFullEqual:"≧",GreaterGreater:"⪢",GreaterLess:"≷",GreaterSlantEqual:"⩾",GreaterTilde:"≳",Gscr:"𝒢",gscr:"ℊ",gsim:"≳",gsime:"⪎",gsiml:"⪐",gtcc:"⪧",gtcir:"⩺",gt:">",GT:">",Gt:"≫",gtdot:"⋗",gtlPar:"⦕",gtquest:"⩼",gtrapprox:"⪆",gtrarr:"⥸",gtrdot:"⋗",gtreqless:"⋛",gtreqqless:"⪌",gtrless:"≷",gtrsim:"≳",gvertneqq:"≩︀",gvnE:"≩︀",Hacek:"ˇ",hairsp:" ",half:"½",hamilt:"ℋ",HARDcy:"Ъ",hardcy:"ъ",harrcir:"⥈",harr:"↔",hArr:"⇔",harrw:"↭",Hat:"^",hbar:"ℏ",Hcirc:"Ĥ",hcirc:"ĥ",hearts:"♥",heartsuit:"♥",hellip:"…",hercon:"⊹",hfr:"𝔥",Hfr:"ℌ",HilbertSpace:"ℋ",hksearow:"⤥",hkswarow:"⤦",hoarr:"⇿",homtht:"∻",hookleftarrow:"↩",hookrightarrow:"↪",hopf:"𝕙",Hopf:"ℍ",horbar:"―",HorizontalLine:"─",hscr:"𝒽",Hscr:"ℋ",hslash:"ℏ",Hstrok:"Ħ",hstrok:"ħ",HumpDownHump:"≎",HumpEqual:"≏",hybull:"⁃",hyphen:"‐",Iacute:"Í",iacute:"í",ic:"⁣",Icirc:"Î",icirc:"î",Icy:"И",icy:"и",Idot:"İ",IEcy:"Е",iecy:"е",iexcl:"¡",iff:"⇔",ifr:"𝔦",Ifr:"ℑ",Igrave:"Ì",igrave:"ì",ii:"ⅈ",iiiint:"⨌",iiint:"∭",iinfin:"⧜",iiota:"℩",IJlig:"IJ",ijlig:"ij",Imacr:"Ī",imacr:"ī",image:"ℑ",ImaginaryI:"ⅈ",imagline:"ℐ",imagpart:"ℑ",imath:"ı",Im:"ℑ",imof:"⊷",imped:"Ƶ",Implies:"⇒",incare:"℅","in":"∈",infin:"∞",infintie:"⧝",inodot:"ı",intcal:"⊺","int":"∫",Int:"∬",integers:"ℤ",Integral:"∫",intercal:"⊺",Intersection:"⋂",intlarhk:"⨗",intprod:"⨼",InvisibleComma:"⁣",InvisibleTimes:"⁢",IOcy:"Ё",iocy:"ё",Iogon:"Į",iogon:"į",Iopf:"𝕀",iopf:"𝕚",Iota:"Ι",iota:"ι",iprod:"⨼",iquest:"¿",iscr:"𝒾",Iscr:"ℐ",isin:"∈",isindot:"⋵",isinE:"⋹",isins:"⋴",isinsv:"⋳",isinv:"∈",it:"⁢",Itilde:"Ĩ",itilde:"ĩ",Iukcy:"І",iukcy:"і",Iuml:"Ï",iuml:"ï",Jcirc:"Ĵ",jcirc:"ĵ",Jcy:"Й",jcy:"й",Jfr:"𝔍",jfr:"𝔧",jmath:"ȷ",Jopf:"𝕁",jopf:"𝕛",Jscr:"𝒥",jscr:"𝒿",Jsercy:"Ј",jsercy:"ј",Jukcy:"Є",jukcy:"є",Kappa:"Κ",kappa:"κ",kappav:"ϰ",Kcedil:"Ķ",kcedil:"ķ",Kcy:"К",kcy:"к",Kfr:"𝔎",kfr:"𝔨",kgreen:"ĸ",KHcy:"Х",khcy:"х",KJcy:"Ќ",kjcy:"ќ",Kopf:"𝕂",kopf:"𝕜",Kscr:"𝒦",kscr:"𝓀",lAarr:"⇚",Lacute:"Ĺ",lacute:"ĺ",laemptyv:"⦴",lagran:"ℒ",Lambda:"Λ",lambda:"λ",lang:"⟨",Lang:"⟪",langd:"⦑",langle:"⟨",lap:"⪅",Laplacetrf:"ℒ",laquo:"«",larrb:"⇤",larrbfs:"⤟",larr:"←",Larr:"↞",lArr:"⇐",larrfs:"⤝",larrhk:"↩",larrlp:"↫",larrpl:"⤹",larrsim:"⥳",larrtl:"↢",latail:"⤙",lAtail:"⤛",lat:"⪫",late:"⪭",lates:"⪭︀",lbarr:"⤌",lBarr:"⤎",lbbrk:"❲",lbrace:"{",lbrack:"[",lbrke:"⦋",lbrksld:"⦏",lbrkslu:"⦍",Lcaron:"Ľ",lcaron:"ľ",Lcedil:"Ļ",lcedil:"ļ",lceil:"⌈",lcub:"{",Lcy:"Л",lcy:"л",ldca:"⤶",ldquo:"“",ldquor:"„",ldrdhar:"⥧",ldrushar:"⥋",ldsh:"↲",le:"≤",lE:"≦",LeftAngleBracket:"⟨",LeftArrowBar:"⇤",leftarrow:"←",LeftArrow:"←",Leftarrow:"⇐",LeftArrowRightArrow:"⇆",leftarrowtail:"↢",LeftCeiling:"⌈",LeftDoubleBracket:"⟦",LeftDownTeeVector:"⥡",LeftDownVectorBar:"⥙",LeftDownVector:"⇃",LeftFloor:"⌊",leftharpoondown:"↽",leftharpoonup:"↼",leftleftarrows:"⇇",leftrightarrow:"↔",LeftRightArrow:"↔",Leftrightarrow:"⇔",leftrightarrows:"⇆",leftrightharpoons:"⇋",leftrightsquigarrow:"↭",LeftRightVector:"⥎",LeftTeeArrow:"↤",LeftTee:"⊣",LeftTeeVector:"⥚",leftthreetimes:"⋋",LeftTriangleBar:"⧏",LeftTriangle:"⊲",LeftTriangleEqual:"⊴",LeftUpDownVector:"⥑",LeftUpTeeVector:"⥠",LeftUpVectorBar:"⥘",LeftUpVector:"↿",LeftVectorBar:"⥒",LeftVector:"↼",lEg:"⪋",leg:"⋚",leq:"≤",leqq:"≦",leqslant:"⩽",lescc:"⪨",les:"⩽",lesdot:"⩿",lesdoto:"⪁",lesdotor:"⪃",lesg:"⋚︀",lesges:"⪓",lessapprox:"⪅",lessdot:"⋖",lesseqgtr:"⋚",lesseqqgtr:"⪋",LessEqualGreater:"⋚",LessFullEqual:"≦",LessGreater:"≶",lessgtr:"≶",LessLess:"⪡",lesssim:"≲",LessSlantEqual:"⩽",LessTilde:"≲",lfisht:"⥼",lfloor:"⌊",Lfr:"𝔏",lfr:"𝔩",lg:"≶",lgE:"⪑",lHar:"⥢",lhard:"↽",lharu:"↼",lharul:"⥪",lhblk:"▄",LJcy:"Љ",ljcy:"љ",llarr:"⇇",ll:"≪",Ll:"⋘",llcorner:"⌞",Lleftarrow:"⇚",llhard:"⥫",lltri:"◺",Lmidot:"Ŀ",lmidot:"ŀ",lmoustache:"⎰",lmoust:"⎰",lnap:"⪉",lnapprox:"⪉",lne:"⪇",lnE:"≨",lneq:"⪇",lneqq:"≨",lnsim:"⋦",loang:"⟬",loarr:"⇽",lobrk:"⟦",longleftarrow:"⟵",LongLeftArrow:"⟵",Longleftarrow:"⟸",longleftrightarrow:"⟷",LongLeftRightArrow:"⟷",Longleftrightarrow:"⟺",longmapsto:"⟼",longrightarrow:"⟶",LongRightArrow:"⟶",Longrightarrow:"⟹",looparrowleft:"↫",looparrowright:"↬",lopar:"⦅",Lopf:"𝕃",lopf:"𝕝",loplus:"⨭",lotimes:"⨴",lowast:"∗",lowbar:"_",LowerLeftArrow:"↙",LowerRightArrow:"↘",loz:"◊",lozenge:"◊",lozf:"⧫",lpar:"(",lparlt:"⦓",lrarr:"⇆",lrcorner:"⌟",lrhar:"⇋",lrhard:"⥭",lrm:"‎",lrtri:"⊿",lsaquo:"‹",lscr:"𝓁",Lscr:"ℒ",lsh:"↰",Lsh:"↰",lsim:"≲",lsime:"⪍",lsimg:"⪏",lsqb:"[",lsquo:"‘",lsquor:"‚",Lstrok:"Ł",lstrok:"ł",ltcc:"⪦",ltcir:"⩹",lt:"<",LT:"<",Lt:"≪",ltdot:"⋖",lthree:"⋋",ltimes:"⋉",ltlarr:"⥶",ltquest:"⩻",ltri:"◃",ltrie:"⊴",ltrif:"◂",ltrPar:"⦖",lurdshar:"⥊",luruhar:"⥦",lvertneqq:"≨︀",lvnE:"≨︀",macr:"¯",male:"♂",malt:"✠",maltese:"✠",Map:"⤅",map:"↦",mapsto:"↦",mapstodown:"↧",mapstoleft:"↤",mapstoup:"↥",marker:"▮",mcomma:"⨩",Mcy:"М",mcy:"м",mdash:"—",mDDot:"∺",measuredangle:"∡",MediumSpace:" ",Mellintrf:"ℳ",Mfr:"𝔐",mfr:"𝔪",mho:"℧",micro:"µ",midast:"*",midcir:"⫰",mid:"∣",middot:"·",minusb:"⊟",minus:"−",minusd:"∸",minusdu:"⨪",MinusPlus:"∓",mlcp:"⫛",mldr:"…",mnplus:"∓",models:"⊧",Mopf:"𝕄",mopf:"𝕞",mp:"∓",mscr:"𝓂",Mscr:"ℳ",mstpos:"∾",Mu:"Μ",mu:"μ",multimap:"⊸",mumap:"⊸",nabla:"∇",Nacute:"Ń",nacute:"ń",nang:"∠⃒",nap:"≉",napE:"⩰̸",napid:"≋̸",napos:"ʼn",napprox:"≉",natural:"♮",naturals:"ℕ",natur:"♮",nbsp:" ",nbump:"≎̸",nbumpe:"≏̸",ncap:"⩃",Ncaron:"Ň",ncaron:"ň",Ncedil:"Ņ",ncedil:"ņ",ncong:"≇",ncongdot:"⩭̸",ncup:"⩂",Ncy:"Н",ncy:"н",ndash:"–",nearhk:"⤤",nearr:"↗",neArr:"⇗",nearrow:"↗",ne:"≠",nedot:"≐̸",NegativeMediumSpace:"​",NegativeThickSpace:"​",NegativeThinSpace:"​",NegativeVeryThinSpace:"​",nequiv:"≢",nesear:"⤨",nesim:"≂̸",NestedGreaterGreater:"≫",NestedLessLess:"≪",NewLine:"\n",nexist:"∄",nexists:"∄",Nfr:"𝔑",nfr:"𝔫",ngE:"≧̸",nge:"≱",ngeq:"≱",ngeqq:"≧̸",ngeqslant:"⩾̸",nges:"⩾̸",nGg:"⋙̸",ngsim:"≵",nGt:"≫⃒",ngt:"≯",ngtr:"≯",nGtv:"≫̸",nharr:"↮",nhArr:"⇎",nhpar:"⫲",ni:"∋",nis:"⋼",nisd:"⋺",niv:"∋",NJcy:"Њ",njcy:"њ",nlarr:"↚",nlArr:"⇍",nldr:"‥",nlE:"≦̸",nle:"≰",nleftarrow:"↚",nLeftarrow:"⇍",nleftrightarrow:"↮",nLeftrightarrow:"⇎",nleq:"≰",nleqq:"≦̸",nleqslant:"⩽̸",nles:"⩽̸",nless:"≮",nLl:"⋘̸",nlsim:"≴",nLt:"≪⃒",nlt:"≮",nltri:"⋪",nltrie:"⋬",nLtv:"≪̸",nmid:"∤",NoBreak:"⁠",NonBreakingSpace:" ",nopf:"𝕟",Nopf:"ℕ",Not:"⫬",not:"¬",NotCongruent:"≢",NotCupCap:"≭",NotDoubleVerticalBar:"∦",NotElement:"∉",NotEqual:"≠",NotEqualTilde:"≂̸",NotExists:"∄",NotGreater:"≯",NotGreaterEqual:"≱",NotGreaterFullEqual:"≧̸",NotGreaterGreater:"≫̸",NotGreaterLess:"≹",NotGreaterSlantEqual:"⩾̸",NotGreaterTilde:"≵",NotHumpDownHump:"≎̸",NotHumpEqual:"≏̸",notin:"∉",notindot:"⋵̸",notinE:"⋹̸",notinva:"∉",notinvb:"⋷",notinvc:"⋶",NotLeftTriangleBar:"⧏̸",NotLeftTriangle:"⋪",NotLeftTriangleEqual:"⋬",NotLess:"≮",NotLessEqual:"≰",NotLessGreater:"≸",NotLessLess:"≪̸",NotLessSlantEqual:"⩽̸",NotLessTilde:"≴",NotNestedGreaterGreater:"⪢̸",NotNestedLessLess:"⪡̸",notni:"∌",notniva:"∌",notnivb:"⋾",notnivc:"⋽",NotPrecedes:"⊀",NotPrecedesEqual:"⪯̸",NotPrecedesSlantEqual:"⋠",NotReverseElement:"∌",NotRightTriangleBar:"⧐̸",NotRightTriangle:"⋫",NotRightTriangleEqual:"⋭",NotSquareSubset:"⊏̸",NotSquareSubsetEqual:"⋢",NotSquareSuperset:"⊐̸",NotSquareSupersetEqual:"⋣",NotSubset:"⊂⃒",NotSubsetEqual:"⊈",NotSucceeds:"⊁",NotSucceedsEqual:"⪰̸",NotSucceedsSlantEqual:"⋡",NotSucceedsTilde:"≿̸",NotSuperset:"⊃⃒",NotSupersetEqual:"⊉",NotTilde:"≁",NotTildeEqual:"≄",NotTildeFullEqual:"≇",NotTildeTilde:"≉",NotVerticalBar:"∤",nparallel:"∦",npar:"∦",nparsl:"⫽⃥",npart:"∂̸",npolint:"⨔",npr:"⊀",nprcue:"⋠",nprec:"⊀",npreceq:"⪯̸",npre:"⪯̸",nrarrc:"⤳̸",nrarr:"↛",nrArr:"⇏",nrarrw:"↝̸",nrightarrow:"↛",nRightarrow:"⇏",nrtri:"⋫",nrtrie:"⋭",nsc:"⊁",nsccue:"⋡",nsce:"⪰̸",Nscr:"𝒩",nscr:"𝓃",nshortmid:"∤",nshortparallel:"∦",nsim:"≁",nsime:"≄",nsimeq:"≄",nsmid:"∤",nspar:"∦",nsqsube:"⋢",nsqsupe:"⋣",nsub:"⊄",nsubE:"⫅̸",nsube:"⊈",nsubset:"⊂⃒",nsubseteq:"⊈",nsubseteqq:"⫅̸",nsucc:"⊁",nsucceq:"⪰̸",nsup:"⊅",nsupE:"⫆̸",nsupe:"⊉",nsupset:"⊃⃒",nsupseteq:"⊉",nsupseteqq:"⫆̸",ntgl:"≹",Ntilde:"Ñ",ntilde:"ñ",ntlg:"≸",ntriangleleft:"⋪",ntrianglelefteq:"⋬",ntriangleright:"⋫",ntrianglerighteq:"⋭",Nu:"Ν",nu:"ν",num:"#",numero:"№",numsp:" ",nvap:"≍⃒",nvdash:"⊬",nvDash:"⊭",nVdash:"⊮",nVDash:"⊯",nvge:"≥⃒",nvgt:">⃒",nvHarr:"⤄",nvinfin:"⧞",nvlArr:"⤂",nvle:"≤⃒",nvlt:"<⃒",nvltrie:"⊴⃒",nvrArr:"⤃",nvrtrie:"⊵⃒",nvsim:"∼⃒",nwarhk:"⤣",nwarr:"↖",nwArr:"⇖",nwarrow:"↖",nwnear:"⤧",Oacute:"Ó",oacute:"ó",oast:"⊛",Ocirc:"Ô",ocirc:"ô",ocir:"⊚",Ocy:"О",ocy:"о",odash:"⊝",Odblac:"Ő",odblac:"ő",odiv:"⨸",odot:"⊙",odsold:"⦼",OElig:"Œ",oelig:"œ",ofcir:"⦿",Ofr:"𝔒",ofr:"𝔬",ogon:"˛",Ograve:"Ò",ograve:"ò",ogt:"⧁",ohbar:"⦵",ohm:"Ω",oint:"∮",olarr:"↺",olcir:"⦾",olcross:"⦻",oline:"‾",olt:"⧀",Omacr:"Ō",omacr:"ō",Omega:"Ω",omega:"ω",Omicron:"Ο",omicron:"ο",omid:"⦶",ominus:"⊖",Oopf:"𝕆",oopf:"𝕠",opar:"⦷",OpenCurlyDoubleQuote:"“",OpenCurlyQuote:"‘",operp:"⦹",oplus:"⊕",orarr:"↻",Or:"⩔",or:"∨",ord:"⩝",order:"ℴ",orderof:"ℴ",ordf:"ª",ordm:"º",origof:"⊶",oror:"⩖",orslope:"⩗",orv:"⩛",oS:"Ⓢ",Oscr:"𝒪",oscr:"ℴ",Oslash:"Ø",oslash:"ø",osol:"⊘",Otilde:"Õ",otilde:"õ",otimesas:"⨶",Otimes:"⨷",otimes:"⊗",Ouml:"Ö",ouml:"ö",ovbar:"⌽",OverBar:"‾",OverBrace:"⏞",OverBracket:"⎴",OverParenthesis:"⏜",para:"¶",parallel:"∥",par:"∥",parsim:"⫳",parsl:"⫽",part:"∂",PartialD:"∂",Pcy:"П",pcy:"п",percnt:"%",period:".",permil:"‰",perp:"⊥",pertenk:"‱",Pfr:"𝔓",pfr:"𝔭",Phi:"Φ",phi:"φ",phiv:"ϕ",phmmat:"ℳ",phone:"☎",Pi:"Π",pi:"π",pitchfork:"⋔",piv:"ϖ",planck:"ℏ",planckh:"ℎ",plankv:"ℏ",plusacir:"⨣",plusb:"⊞",pluscir:"⨢",plus:"+",plusdo:"∔",plusdu:"⨥",pluse:"⩲",PlusMinus:"±",plusmn:"±",plussim:"⨦",plustwo:"⨧",pm:"±",Poincareplane:"ℌ",pointint:"⨕",popf:"𝕡",Popf:"ℙ",pound:"£",prap:"⪷",Pr:"⪻",pr:"≺",prcue:"≼",precapprox:"⪷",prec:"≺",preccurlyeq:"≼",Precedes:"≺",PrecedesEqual:"⪯",PrecedesSlantEqual:"≼",PrecedesTilde:"≾",preceq:"⪯",precnapprox:"⪹",precneqq:"⪵",precnsim:"⋨",pre:"⪯",prE:"⪳",precsim:"≾",prime:"′",Prime:"″",primes:"ℙ",prnap:"⪹",prnE:"⪵",prnsim:"⋨",prod:"∏",Product:"∏",profalar:"⌮",profline:"⌒",profsurf:"⌓",prop:"∝",Proportional:"∝",Proportion:"∷",propto:"∝",prsim:"≾",prurel:"⊰",Pscr:"𝒫",pscr:"𝓅",Psi:"Ψ",psi:"ψ",puncsp:" ",Qfr:"𝔔",qfr:"𝔮",qint:"⨌",qopf:"𝕢",Qopf:"ℚ",qprime:"⁗",Qscr:"𝒬",qscr:"𝓆",quaternions:"ℍ",quatint:"⨖",quest:"?",questeq:"≟",quot:'"',QUOT:'"',rAarr:"⇛",race:"∽̱",Racute:"Ŕ",racute:"ŕ",radic:"√",raemptyv:"⦳",rang:"⟩",Rang:"⟫",rangd:"⦒",range:"⦥",rangle:"⟩",raquo:"»",rarrap:"⥵",rarrb:"⇥",rarrbfs:"⤠",rarrc:"⤳",rarr:"→",Rarr:"↠",rArr:"⇒",rarrfs:"⤞",rarrhk:"↪",rarrlp:"↬",rarrpl:"⥅",rarrsim:"⥴",Rarrtl:"⤖",rarrtl:"↣",rarrw:"↝",ratail:"⤚",rAtail:"⤜",ratio:"∶",rationals:"ℚ",rbarr:"⤍",rBarr:"⤏",RBarr:"⤐",rbbrk:"❳",rbrace:"}",rbrack:"]",rbrke:"⦌",rbrksld:"⦎",rbrkslu:"⦐",Rcaron:"Ř",rcaron:"ř",Rcedil:"Ŗ",rcedil:"ŗ",rceil:"⌉",rcub:"}",Rcy:"Р",rcy:"р",rdca:"⤷",rdldhar:"⥩",rdquo:"”",rdquor:"”",rdsh:"↳",real:"ℜ",realine:"ℛ",realpart:"ℜ",reals:"ℝ",Re:"ℜ",rect:"▭",reg:"®",REG:"®",ReverseElement:"∋",ReverseEquilibrium:"⇋",ReverseUpEquilibrium:"⥯",rfisht:"⥽",rfloor:"⌋",rfr:"𝔯",Rfr:"ℜ",rHar:"⥤",rhard:"⇁",rharu:"⇀",rharul:"⥬",Rho:"Ρ",rho:"ρ",rhov:"ϱ",RightAngleBracket:"⟩",RightArrowBar:"⇥",rightarrow:"→",RightArrow:"→",Rightarrow:"⇒",RightArrowLeftArrow:"⇄",rightarrowtail:"↣",RightCeiling:"⌉",RightDoubleBracket:"⟧",RightDownTeeVector:"⥝",RightDownVectorBar:"⥕",RightDownVector:"⇂",RightFloor:"⌋",rightharpoondown:"⇁",rightharpoonup:"⇀",rightleftarrows:"⇄",rightleftharpoons:"⇌",rightrightarrows:"⇉",rightsquigarrow:"↝",RightTeeArrow:"↦",RightTee:"⊢",RightTeeVector:"⥛",rightthreetimes:"⋌",RightTriangleBar:"⧐",RightTriangle:"⊳",RightTriangleEqual:"⊵",RightUpDownVector:"⥏",RightUpTeeVector:"⥜",RightUpVectorBar:"⥔",RightUpVector:"↾",RightVectorBar:"⥓",RightVector:"⇀",ring:"˚",risingdotseq:"≓",rlarr:"⇄",rlhar:"⇌",rlm:"‏",rmoustache:"⎱",rmoust:"⎱",rnmid:"⫮",roang:"⟭",roarr:"⇾",robrk:"⟧",ropar:"⦆",ropf:"𝕣",Ropf:"ℝ",roplus:"⨮",rotimes:"⨵",RoundImplies:"⥰",rpar:")",rpargt:"⦔",rppolint:"⨒",rrarr:"⇉",Rrightarrow:"⇛",rsaquo:"›",rscr:"𝓇",Rscr:"ℛ",rsh:"↱",Rsh:"↱",rsqb:"]",rsquo:"’",rsquor:"’",rthree:"⋌",rtimes:"⋊",rtri:"▹",rtrie:"⊵",rtrif:"▸",rtriltri:"⧎",RuleDelayed:"⧴",ruluhar:"⥨",rx:"℞",Sacute:"Ś",sacute:"ś",sbquo:"‚",scap:"⪸",Scaron:"Š",scaron:"š",Sc:"⪼",sc:"≻",sccue:"≽",sce:"⪰",scE:"⪴",Scedil:"Ş",scedil:"ş",Scirc:"Ŝ",scirc:"ŝ",scnap:"⪺",scnE:"⪶",scnsim:"⋩",scpolint:"⨓",scsim:"≿",Scy:"С",scy:"с",sdotb:"⊡",sdot:"⋅",sdote:"⩦",searhk:"⤥",searr:"↘",seArr:"⇘",searrow:"↘",sect:"§",semi:";",seswar:"⤩",setminus:"∖",setmn:"∖",sext:"✶",Sfr:"𝔖",sfr:"𝔰",sfrown:"⌢",sharp:"♯",SHCHcy:"Щ",shchcy:"щ",SHcy:"Ш",shcy:"ш",ShortDownArrow:"↓",ShortLeftArrow:"←",shortmid:"∣",shortparallel:"∥",ShortRightArrow:"→",ShortUpArrow:"↑",shy:"­",Sigma:"Σ",sigma:"σ",sigmaf:"ς",sigmav:"ς",sim:"∼",simdot:"⩪",sime:"≃",simeq:"≃",simg:"⪞",simgE:"⪠",siml:"⪝",simlE:"⪟",simne:"≆",simplus:"⨤",simrarr:"⥲",slarr:"←",SmallCircle:"∘",smallsetminus:"∖",smashp:"⨳",smeparsl:"⧤",smid:"∣",smile:"⌣",smt:"⪪",smte:"⪬",smtes:"⪬︀",SOFTcy:"Ь",softcy:"ь",solbar:"⌿",solb:"⧄",sol:"/",Sopf:"𝕊",sopf:"𝕤",spades:"♠",spadesuit:"♠",spar:"∥",sqcap:"⊓",sqcaps:"⊓︀",sqcup:"⊔",sqcups:"⊔︀",Sqrt:"√",sqsub:"⊏",sqsube:"⊑",sqsubset:"⊏",sqsubseteq:"⊑",sqsup:"⊐",sqsupe:"⊒",sqsupset:"⊐",sqsupseteq:"⊒",square:"□",Square:"□",SquareIntersection:"⊓",SquareSubset:"⊏",SquareSubsetEqual:"⊑",SquareSuperset:"⊐",SquareSupersetEqual:"⊒",SquareUnion:"⊔",squarf:"▪",squ:"□",squf:"▪",srarr:"→",Sscr:"𝒮",sscr:"𝓈",ssetmn:"∖",ssmile:"⌣",sstarf:"⋆",Star:"⋆",star:"☆",starf:"★",straightepsilon:"ϵ",straightphi:"ϕ",strns:"¯",sub:"⊂",Sub:"⋐",subdot:"⪽",subE:"⫅",sube:"⊆",subedot:"⫃",submult:"⫁",subnE:"⫋",subne:"⊊",subplus:"⪿",subrarr:"⥹",subset:"⊂",Subset:"⋐",subseteq:"⊆",subseteqq:"⫅",SubsetEqual:"⊆",subsetneq:"⊊",subsetneqq:"⫋",subsim:"⫇",subsub:"⫕",subsup:"⫓",succapprox:"⪸",succ:"≻",succcurlyeq:"≽",Succeeds:"≻",SucceedsEqual:"⪰",SucceedsSlantEqual:"≽",SucceedsTilde:"≿",succeq:"⪰",succnapprox:"⪺",succneqq:"⪶",succnsim:"⋩",succsim:"≿",SuchThat:"∋",sum:"∑",Sum:"∑",sung:"♪",sup1:"¹",sup2:"²",sup3:"³",sup:"⊃",Sup:"⋑",supdot:"⪾",supdsub:"⫘",supE:"⫆",supe:"⊇",supedot:"⫄",Superset:"⊃",SupersetEqual:"⊇",suphsol:"⟉",suphsub:"⫗",suplarr:"⥻",supmult:"⫂",supnE:"⫌",supne:"⊋",supplus:"⫀",supset:"⊃",Supset:"⋑",supseteq:"⊇",supseteqq:"⫆",supsetneq:"⊋",supsetneqq:"⫌",supsim:"⫈",supsub:"⫔",supsup:"⫖",swarhk:"⤦",swarr:"↙",swArr:"⇙",swarrow:"↙",swnwar:"⤪",szlig:"ß",Tab:"	",target:"⌖",Tau:"Τ",tau:"τ",tbrk:"⎴",Tcaron:"Ť",tcaron:"ť",Tcedil:"Ţ",tcedil:"ţ",Tcy:"Т",tcy:"т",tdot:"⃛",telrec:"⌕",Tfr:"𝔗",tfr:"𝔱",there4:"∴",therefore:"∴",Therefore:"∴",Theta:"Θ",theta:"θ",thetasym:"ϑ",thetav:"ϑ",thickapprox:"≈",thicksim:"∼",ThickSpace:"  ",ThinSpace:" ",thinsp:" ",thkap:"≈",thksim:"∼",THORN:"Þ",thorn:"þ",tilde:"˜",Tilde:"∼",TildeEqual:"≃",TildeFullEqual:"≅",TildeTilde:"≈",timesbar:"⨱",timesb:"⊠",times:"×",timesd:"⨰",tint:"∭",toea:"⤨",topbot:"⌶",topcir:"⫱",top:"⊤",Topf:"𝕋",topf:"𝕥",topfork:"⫚",tosa:"⤩",tprime:"‴",trade:"™",TRADE:"™",triangle:"▵",triangledown:"▿",triangleleft:"◃",trianglelefteq:"⊴",triangleq:"≜",triangleright:"▹",trianglerighteq:"⊵",tridot:"◬",trie:"≜",triminus:"⨺",TripleDot:"⃛",triplus:"⨹",trisb:"⧍",tritime:"⨻",trpezium:"⏢",Tscr:"𝒯",tscr:"𝓉",TScy:"Ц",tscy:"ц",TSHcy:"Ћ",tshcy:"ћ",Tstrok:"Ŧ",tstrok:"ŧ",twixt:"≬",twoheadleftarrow:"↞",twoheadrightarrow:"↠",Uacute:"Ú",uacute:"ú",uarr:"↑",Uarr:"↟",uArr:"⇑",Uarrocir:"⥉",Ubrcy:"Ў",ubrcy:"ў",Ubreve:"Ŭ",ubreve:"ŭ",Ucirc:"Û",ucirc:"û",Ucy:"У",ucy:"у",udarr:"⇅",Udblac:"Ű",udblac:"ű",udhar:"⥮",ufisht:"⥾",Ufr:"𝔘",ufr:"𝔲",Ugrave:"Ù",ugrave:"ù",uHar:"⥣",uharl:"↿",uharr:"↾",uhblk:"▀",ulcorn:"⌜",ulcorner:"⌜",ulcrop:"⌏",ultri:"◸",Umacr:"Ū",umacr:"ū",uml:"¨",UnderBar:"_",UnderBrace:"⏟",UnderBracket:"⎵",UnderParenthesis:"⏝",Union:"⋃",UnionPlus:"⊎",Uogon:"Ų",uogon:"ų",Uopf:"𝕌",uopf:"𝕦",UpArrowBar:"⤒",uparrow:"↑",UpArrow:"↑",Uparrow:"⇑",UpArrowDownArrow:"⇅",updownarrow:"↕",UpDownArrow:"↕",Updownarrow:"⇕",UpEquilibrium:"⥮",upharpoonleft:"↿",upharpoonright:"↾",uplus:"⊎",UpperLeftArrow:"↖",UpperRightArrow:"↗",upsi:"υ",Upsi:"ϒ",upsih:"ϒ",Upsilon:"Υ",upsilon:"υ",UpTeeArrow:"↥",UpTee:"⊥",upuparrows:"⇈",urcorn:"⌝",urcorner:"⌝",urcrop:"⌎",Uring:"Ů",uring:"ů",urtri:"◹",Uscr:"𝒰",uscr:"𝓊",utdot:"⋰",Utilde:"Ũ",utilde:"ũ",utri:"▵",utrif:"▴",uuarr:"⇈",Uuml:"Ü",uuml:"ü",uwangle:"⦧",vangrt:"⦜",
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i=r(13);n.prototype.getPrimitives=function(){return{event_broadcast:this.broadcast,event_broadcastandwait:this.broadcastAndWait,event_whengreaterthan:this.hatGreaterThanPredicate}},n.prototype.getHats=function(){return{event_whenflagclicked:{restartExistingThreads:!0},event_whenkeypressed:{restartExistingThreads:!1},event_whenthisspriteclicked:{restartExistingThreads:!0},event_whenbackdropswitchesto:{restartExistingThreads:!0},event_whengreaterthan:{restartExistingThreads:!1,edgeActivated:!0},event_whenbroadcastreceived:{restartExistingThreads:!0}}},n.prototype.hatGreaterThanPredicate=function(t,e){var r=i.toString(t.WHENGREATERTHANMENU).toLowerCase(),n=i.toNumber(t.VALUE);return"timer"==r&&e.ioQuery("clock","projectTimer")>n},n.prototype.broadcast=function(t,e){var r=i.toString(t.BROADCAST_OPTION);e.startHats("event_whenbroadcastreceived",{BROADCAST_OPTION:r})},n.prototype.broadcastAndWait=function(t,e){var r=i.toString(t.BROADCAST_OPTION);if(e.stackFrame.startedThreads||(e.stackFrame.startedThreads=e.startHats("event_whenbroadcastreceived",{BROADCAST_OPTION:r}),0!=e.stackFrame.startedThreads.length)){var n=this,o=e.stackFrame.startedThreads.some(function(t){return n.runtime.isActiveThread(t)});o&&e.yieldFrame()}},t.exports=n},function(t,e,r){function n(t){this.runtime=t}var i=r(13);n.prototype.getPrimitives=function(){return{looks_say:this.say,looks_sayforsecs:this.sayforsecs,looks_think:this.think,looks_thinkforsecs:this.sayforsecs,looks_show:this.show,looks_hide:this.hide,looks_switchcostumeto:this.switchCostume,looks_switchbackdropto:this.switchBackdrop,looks_switchbackdroptoandwait:this.switchBackdropAndWait,looks_nextcostume:this.nextCostume,looks_nextbackdrop:this.nextBackdrop,looks_changeeffectby:this.changeEffect,looks_seteffectto:this.setEffect,looks_cleargraphiceffects:this.clearEffects,looks_changesizeby:this.changeSize,looks_setsizeto:this.setSize,looks_size:this.getSize,looks_costumeorder:this.getCostumeIndex,looks_backdroporder:this.getBackdropIndex,looks_backdropname:this.getBackdropName}},n.prototype.say=function(t,e){e.target.setSay("say",t.MESSAGE)},n.prototype.sayforsecs=function(t,e){return e.target.setSay("say",t.MESSAGE),new Promise(function(r){setTimeout(function(){e.target.setSay(),r()},1e3*t.SECS)})},n.prototype.think=function(t,e){e.target.setSay("think",t.MESSAGE)},n.prototype.thinkforsecs=function(t,e){return e.target.setSay("think",t.MESSAGE),new Promise(function(r){setTimeout(function(){e.target.setSay(),r()},1e3*t.SECS)})},n.prototype.show=function(t,e){e.target.setVisible(!0)},n.prototype.hide=function(t,e){e.target.setVisible(!1)},n.prototype._setCostumeOrBackdrop=function(t,e,r){if("number"==typeof e)t.setCostume(r?e:e-1);else{var n=t.getCostumeIndexByName(e);if(n>-1)t.setCostume(n);else if("previous costume"==n||"previous backdrop"==n)t.setCostume(t.currentCostume-1);else if("next costume"==n||"next backdrop"==n)t.setCostume(t.currentCostume+1);else{var o=i.toNumber(e);isNaN(o)||t.setCostume(r?o:o-1)}}if(t==this.runtime.getTargetForStage()){var s=t.sprite.costumes[t.currentCostume].name;return this.runtime.startHats("event_whenbackdropswitchesto",{BACKDROP:s})}return[]},n.prototype.switchCostume=function(t,e){this._setCostumeOrBackdrop(e.target,t.COSTUME)},n.prototype.nextCostume=function(t,e){this._setCostumeOrBackdrop(e.target,e.target.currentCostume+1,!0)},n.prototype.switchBackdrop=function(t){this._setCostumeOrBackdrop(this.runtime.getTargetForStage(),t.BACKDROP)},n.prototype.switchBackdropAndWait=function(t,e){if(e.stackFrame.startedThreads||(e.stackFrame.startedThreads=this._setCostumeOrBackdrop(this.runtime.getTargetForStage(),t.BACKDROP),0!=e.stackFrame.startedThreads.length)){var r=this,n=e.stackFrame.startedThreads.some(function(t){return r.runtime.isActiveThread(t)});n&&e.yieldFrame()}},n.prototype.nextBackdrop=function(){var t=this.runtime.getTargetForStage();this._setCostumeOrBackdrop(t,t.currentCostume+1,!0)},n.prototype.changeEffect=function(t,e){var r=i.toString(t.EFFECT).toLowerCase(),n=i.toNumber(t.CHANGE);if(e.target.effects.hasOwnProperty(r)){var o=n+e.target.effects[r];e.target.setEffect(r,o)}},n.prototype.setEffect=function(t,e){var r=i.toString(t.EFFECT).toLowerCase(),n=i.toNumber(t.VALUE);e.target.setEffect(r,n)},n.prototype.clearEffects=function(t,e){e.target.clearEffects()},n.prototype.changeSize=function(t,e){var r=i.toNumber(t.CHANGE);e.target.setSize(e.target.size+r)},n.prototype.setSize=function(t,e){var r=i.toNumber(t.SIZE);e.target.setSize(r)},n.prototype.getSize=function(t,e){return e.target.size},n.prototype.getBackdropIndex=function(){var t=this.runtime.getTargetForStage();return t.currentCostume+1},n.prototype.getBackdropName=function(){var t=this.runtime.getTargetForStage();return t.sprite.costumes[t.currentCostume].name},n.prototype.getCostumeIndex=function(t,e){return e.target.currentCostume+1},t.exports=n},function(t,e,r){function n(t){this.runtime=t}var i=r(13),o=r(16),s=r(8);n.prototype.getPrimitives=function(){return{motion_movesteps:this.moveSteps,motion_gotoxy:this.goToXY,motion_turnright:this.turnRight,motion_turnleft:this.turnLeft,motion_pointindirection:this.pointInDirection,motion_glidesecstoxy:this.glide,motion_changexby:this.changeX,motion_setx:this.setX,motion_changeyby:this.changeY,motion_sety:this.setY,motion_xposition:this.getX,motion_yposition:this.getY,motion_direction:this.getDirection}},n.prototype.moveSteps=function(t,e){var r=i.toNumber(t.STEPS),n=o.degToRad(e.target.direction),s=r*Math.cos(n),a=r*Math.sin(n);e.target.setXY(e.target.x+s,e.target.y+a)},n.prototype.goToXY=function(t,e){var r=i.toNumber(t.X),n=i.toNumber(t.Y);e.target.setXY(r,n)},n.prototype.turnRight=function(t,e){var r=i.toNumber(t.DEGREES);e.target.setDirection(e.target.direction+r)},n.prototype.turnLeft=function(t,e){var r=i.toNumber(t.DEGREES);e.target.setDirection(e.target.direction-r)},n.prototype.pointInDirection=function(t,e){var r=i.toNumber(t.DIRECTION);e.target.setDirection(r)},n.prototype.glide=function(t,e){if(e.stackFrame.timer){var r=e.stackFrame.timer.timeElapsed();if(r<1e3*e.stackFrame.duration){var n=r/(1e3*e.stackFrame.duration),o=n*(e.stackFrame.endX-e.stackFrame.startX),a=n*(e.stackFrame.endY-e.stackFrame.startY);e.target.setXY(e.stackFrame.startX+o,e.stackFrame.startY+a),e.yieldFrame()}else e.target.setXY(e.stackFrame.endX,e.stackFrame.endY)}else{if(e.stackFrame.timer=new s,e.stackFrame.timer.start(),e.stackFrame.duration=i.toNumber(t.SECS),e.stackFrame.startX=e.target.x,e.stackFrame.startY=e.target.y,e.stackFrame.endX=i.toNumber(t.X),e.stackFrame.endY=i.toNumber(t.Y),e.stackFrame.duration<=0)return void e.target.setXY(e.stackFrame.endX,e.stackFrame.endY);e.yieldFrame()}},n.prototype.changeX=function(t,e){var r=i.toNumber(t.DX);e.target.setXY(e.target.x+r,e.target.y)},n.prototype.setX=function(t,e){var r=i.toNumber(t.X);e.target.setXY(r,e.target.y)},n.prototype.changeY=function(t,e){var r=i.toNumber(t.DY);e.target.setXY(e.target.x,e.target.y+r)},n.prototype.setY=function(t,e){var r=i.toNumber(t.Y);e.target.setXY(e.target.x,r)},n.prototype.getX=function(t,e){return e.target.x},n.prototype.getY=function(t,e){return e.target.y},n.prototype.getDirection=function(t,e){return e.target.direction},t.exports=n},function(t,e,r){function n(t){this.runtime=t}var i=r(13);n.prototype.getPrimitives=function(){return{operator_add:this.add,operator_subtract:this.subtract,operator_multiply:this.multiply,operator_divide:this.divide,operator_lt:this.lt,operator_equals:this.equals,operator_gt:this.gt,operator_and:this.and,operator_or:this.or,operator_not:this.not,operator_random:this.random,operator_join:this.join,operator_letter_of:this.letterOf,operator_length:this.length,operator_mod:this.mod,operator_round:this.round,operator_mathop:this.mathop}},n.prototype.add=function(t){return i.toNumber(t.NUM1)+i.toNumber(t.NUM2)},n.prototype.subtract=function(t){return i.toNumber(t.NUM1)-i.toNumber(t.NUM2)},n.prototype.multiply=function(t){return i.toNumber(t.NUM1)*i.toNumber(t.NUM2)},n.prototype.divide=function(t){return i.toNumber(t.NUM1)/i.toNumber(t.NUM2)},n.prototype.lt=function(t){return i.compare(t.OPERAND1,t.OPERAND2)<0},n.prototype.equals=function(t){return 0==i.compare(t.OPERAND1,t.OPERAND2)},n.prototype.gt=function(t){return i.compare(t.OPERAND1,t.OPERAND2)>0},n.prototype.and=function(t){return i.toBoolean(t.OPERAND1)&&i.toBoolean(t.OPERAND2)},n.prototype.or=function(t){return i.toBoolean(t.OPERAND1)||i.toBoolean(t.OPERAND2)},n.prototype.not=function(t){return!i.toBoolean(t.OPERAND)},n.prototype.random=function(t){var e=i.toNumber(t.FROM),r=i.toNumber(t.TO),n=e<=r?e:r,o=e<=r?r:e;if(n==o)return n;var s=n==parseInt(n),a=o==parseInt(o);return s&&a?n+parseInt(Math.random()*(o+1-n)):Math.random()*(o-n)+n},n.prototype.join=function(t){return i.toString(t.STRING1)+i.toString(t.STRING2)},n.prototype.letterOf=function(t){var e=i.toNumber(t.LETTER)-1,r=i.toString(t.STRING);return e<0||e>=r.length?"":r.charAt(e)},n.prototype.length=function(t){return i.toString(t.STRING).length},n.prototype.mod=function(t){var e=i.toNumber(t.NUM1),r=i.toNumber(t.NUM2),n=e%r;return n/r<0&&(n+=r),n},n.prototype.round=function(t){return Math.round(i.toNumber(t.NUM))},n.prototype.mathop=function(t){var e=i.toString(t.OPERATOR).toLowerCase(),r=i.toNumber(t.NUM);switch(e){case"abs":return Math.abs(r);case"floor":return Math.floor(r);case"ceiling":return Math.ceil(r);case"sqrt":return Math.sqrt(r);case"sin":return Math.sin(Math.PI*r/180);case"cos":return Math.cos(Math.PI*r/180);case"tan":return Math.tan(Math.PI*r/180);case"asin":return 180*Math.asin(r)/Math.PI;case"acos":return 180*Math.acos(r)/Math.PI;case"atan":return 180*Math.atan(r)/Math.PI;case"ln":return Math.log(r);case"log":return Math.log(r)/Math.LN10;case"e ^":return Math.exp(r);case"10 ^":return Math.pow(10,r)}return 0},t.exports=n},function(t,e,r){function n(t){this.runtime=t}var i=r(13);n.prototype.getPrimitives=function(){return{sensing_touchingcolor:this.touchingColor,sensing_coloristouchingcolor:this.colorTouchingColor,sensing_timer:this.getTimer,sensing_resettimer:this.resetTimer,sensing_mousex:this.getMouseX,sensing_mousey:this.getMouseY,sensing_mousedown:this.getMouseDown,sensing_keypressed:this.getKeyPressed,sensing_current:this.current}},n.prototype.touchingColor=function(t,e){var r=i.toRgbColorList(t.COLOR);return e.target.isTouchingColor(r)},n.prototype.colorTouchingColor=function(t,e){var r=i.toRgbColorList(t.COLOR),n=i.toRgbColorList(t.COLOR2);return e.target.colorIsTouchingColor(n,r)},n.prototype.getTimer=function(t,e){return e.ioQuery("clock","projectTimer")},n.prototype.resetTimer=function(t,e){e.ioQuery("clock","resetProjectTimer")},n.prototype.getMouseX=function(t,e){return e.ioQuery("mouse","getX")},n.prototype.getMouseY=function(t,e){return e.ioQuery("mouse","getY")},n.prototype.getMouseDown=function(t,e){return e.ioQuery("mouse","getIsDown")},n.prototype.current=function(t){var e=i.toString(t.CURRENTMENU).toLowerCase(),r=new Date;switch(e){case"year":return r.getFullYear();case"month":return r.getMonth()+1;case"date":return r.getDate();case"dayofweek":return r.getDay()+1;case"hour":return r.getHours();case"minute":return r.getMinutes();case"second":return r.getSeconds()}return 0},n.prototype.getKeyPressed=function(t,e){return e.ioQuery("keyboard","getKeyIsDown",t.KEY_OPTION)},t.exports=n},function(t,e,r){function n(t,e){i(JSON.parse(t),e,!0)}function i(t,e,r){if(t.hasOwnProperty("objName")){var n=new c,s=new p(n);if(t.hasOwnProperty("objName")&&(s.name=t.objName),t.hasOwnProperty("costumes"))for(var a=0;a<t.costumes.length;a++){var u=t.costumes[a];s.costumes.push({skin:"https://cdn.assets.scratch.mit.edu/internalapi/asset/"+u.baseLayerMD5+"/get/",name:u.costumeName,bitmapResolution:u.bitmapResolution,rotationCenterX:u.rotationCenterX,rotationCenterY:u.rotationCenterY})}t.hasOwnProperty("scripts")&&o(t.scripts,n);var h=s.createClone();if(e.targets.push(h),t.scratchX&&(h.x=t.scratchX),t.scratchY&&(h.y=t.scratchY),t.direction&&(h.direction=t.direction),t.scale&&(h.size=100*t.scale),t.visible&&(h.visible=t.visible),t.currentCostumeIndex&&(h.currentCostume=t.currentCostumeIndex),h.isStage=r,t.children)for(var l=0;l<t.children.length;l++)i(t.children[l],e,!1)}}function o(t,e){for(var r=0;r<t.length;r++){var n=t[r],i=n[0],o=n[1],u=n[2],c=s(u);c[0]&&(c[0].x=1.1*i,c[0].y=1.1*o,c[0].topLevel=!0,c[0].parent=null);for(var p=a(c),h=0;h<p.length;h++)e.createBlock(p[h])}}function s(t){for(var e=[],r=null,n=0;n<t.length;n++){var i=t[n],o=u(i);r&&(o.parent=r.id,r.next=o.id),r=o,e.push(o)}return e}function a(t){for(var e=[],r=0;r<t.length;r++){var n=t[r];e.push(n),n.children&&(e=e.concat(a(n.children))),delete n.children}return e}function u(t){var e=t[0];if(!e||!f[e])return void console.warn("Couldn't find SB2 block: ",e);for(var r=f[e],n={id:l(),opcode:r.opcode,inputs:{},fields:{},next:null,shadow:!1,children:[]},i=0;i<r.argMap.length;i++){var o=r.argMap[i],a=t[i+1],c=!1;if("input"==o.type){var p=l();if(n.inputs[o.inputName]={name:o.inputName,block:null,shadow:null},"object"==typeof a&&a){var d;d="object"==typeof a[0]&&a[0]?s(a):[u(a)];for(var g=0;g<d.length;g++)d[g].parent=n.id;c=!0,n.inputs[o.inputName].block=d[0].id,n.children=n.children.concat(d)}if(!o.inputOp)continue;var m=a,_=o.inputName;"math_number"==o.inputOp||"math_whole_number"==o.inputOp||"math_positive_number"==o.inputOp||"math_integer"==o.inputOp||"math_angle"==o.inputOp?(_="NUM",c&&(m=10)):"text"==o.inputOp?(_="TEXT",c&&(m="")):"colour_picker"==o.inputOp&&(m=h.decimalToHex(a),_="COLOUR",c&&(m="#990000"));var y={};y[_]={name:_,value:m},n.children.push({id:p,opcode:o.inputOp,inputs:{},fields:y,next:null,topLevel:!1,parent:n.id,shadow:!0}),n.inputs[o.inputName].shadow=p,n.inputs[o.inputName].block||(n.inputs[o.inputName].block=p)}else"field"==o.type&&(n.fields[o.fieldName]={name:o.fieldName,value:a})}return n}var c=r(34),p=r(85),h=r(14),l=r(88),f=r(89);t.exports=n},function(t,e,r){function n(){this._blocks={},this._scripts=[]}var i=r(35);n.BRANCH_INPUT_PREFIX="SUBSTACK",n.prototype.getBlock=function(t){return this._blocks[t]},n.prototype.getScripts=function(){return this._scripts},n.prototype.getNextBlock=function(t){return"undefined"==typeof this._blocks[t]?null:this._blocks[t].next},n.prototype.getBranch=function(t,e){var r=this._blocks[t];if("undefined"==typeof r)return null;e||(e=1);var i=n.BRANCH_INPUT_PREFIX;return e>1&&(i+=e),i in r.inputs?r.inputs[i].block:null},n.prototype.getOpcode=function(t){return"undefined"==typeof this._blocks[t]?null:this._blocks[t].opcode},n.prototype.getFields=function(t){return"undefined"==typeof this._blocks[t]?null:this._blocks[t].fields},n.prototype.getInputs=function(t){if("undefined"==typeof this._blocks[t])return null;var e={};for(var r in this._blocks[t].inputs)r.substring(0,n.BRANCH_INPUT_PREFIX.length)!=n.BRANCH_INPUT_PREFIX&&(e[r]=this._blocks[t].inputs[r]);return e},n.prototype.getTopLevelScript=function(t){if("undefined"==typeof this._blocks[t])return null;for(var e=this._blocks[t];null!==e.parent;)e=this._blocks[e.parent];return e.id},n.prototype.blocklyListen=function(t,e,r){if("object"==typeof t&&"string"==typeof t.blockId){if("stackclick"===t.element)return void(r&&r.toggleScript(t.blockId));switch(t.type){case"create":for(var n=i(t),o=0;o<n.length;o++)this.createBlock(n[o],e);break;case"change":this.changeBlock({id:t.blockId,element:t.element,name:t.name,value:t.newValue});break;case"move":this.moveBlock({id:t.blockId,oldParent:t.oldParentId,oldInput:t.oldInputName,newParent:t.newParentId,newInput:t.newInputName,newCoordinate:t.newCoordinate});break;case"delete":if(this._blocks[t.blockId].shadow)return;this.deleteBlock({id:t.blockId})}}},n.prototype.createBlock=function(t,e){this._blocks.hasOwnProperty(t.id)||(this._blocks[t.id]=t,!e&&t.topLevel&&this._addScript(t.id))},n.prototype.changeBlock=function(t){"field"===t.element&&"undefined"!=typeof this._blocks[t.id]&&"undefined"!=typeof this._blocks[t.id].fields[t.name]&&(this._blocks[t.id].fields[t.name].value=t.value)},n.prototype.moveBlock=function(t){if(t.newCoordinate&&(this._blocks[t.id].x=t.newCoordinate.x,this._blocks[t.id].y=t.newCoordinate.y),void 0!==t.oldParent){var e=this._blocks[t.oldParent];void 0!==t.oldInput&&e.inputs[t.oldInput].block===t.id?e.inputs[t.oldInput].block=null:e.next===t.id&&(e.next=null),this._blocks[t.id].parent=null}if(void 0===t.newParent)this._addScript(t.id);else{if(this._deleteScript(t.id),void 0!==t.newInput){var r=null;this._blocks[t.newParent].inputs.hasOwnProperty(t.newInput)&&(r=this._blocks[t.newParent].inputs[t.newInput].shadow),this._blocks[t.newParent].inputs[t.newInput]={name:t.newInput,block:t.id,shadow:r}}else this._blocks[t.newParent].next=t.id;this._blocks[t.id].parent=t.newParent}},n.prototype.deleteBlock=function(t){var e=this._blocks[t.id];null!==e.next&&this.deleteBlock({id:e.next});for(var r in e.inputs)null!==e.inputs[r].block&&this.deleteBlock({id:e.inputs[r].block}),null!==e.inputs[r].shadow&&e.inputs[r].shadow!==e.inputs[r].block&&this.deleteBlock({id:e.inputs[r].shadow});this._deleteScript(t.id),delete this._blocks[t.id]},n.prototype.toXML=function(){for(var t='<xml xmlns="http://www.w3.org/1999/xhtml">',e=0;e<this._scripts.length;e++)t+=this.blockToXML(this._scripts[e]);return t+"</xml>"},n.prototype.blockToXML=function(t){var e=this._blocks[t],r=e.shadow?"shadow":"block",n=e.topLevel?' x="'+e.x+'" y="'+e.y+'"':"",i="";i+="<"+r+' id="'+e.id+'" type="'+e.opcode+'"'+n+">";for(var o in e.inputs){var s=e.inputs[o];(s.block||s.shadow)&&(i+='<value name="'+s.name+'">',s.block&&(i+=this.blockToXML(s.block)),s.shadow&&s.shadow!=s.block&&(i+=this.blockToXML(s.shadow)),i+="</value>")}for(var a in e.fields){var u=e.fields[a];i+='<field name="'+u.name+'">'+u.value+"</field>"}return e.next&&(i+="<next>"+this.blockToXML(e.next)+"</next>"),i+="</"+r+">"},n.prototype._addScript=function(t){var e=this._scripts.indexOf(t);e>-1||(this._scripts.push(t),this._blocks[t].topLevel=!0)},n.prototype._deleteScript=function(t){var e=this._scripts.indexOf(t);e>-1&&this._scripts.splice(e,1),this._blocks[t]&&(this._blocks[t].topLevel=!1)},t.exports=n},function(t,e,r){function n(t){for(var e={},r=0;r<t.length;r++){var n=t[r];if(n.name&&n.attribs){var o=n.name.toLowerCase();"block"!=o&&"shadow"!=o||i(n,e,!0,null)}}var s=[];for(var a in e)s.push(e[a]);return s}function i(t,e,r,n){var o={id:t.attribs.id,opcode:t.attribs.type,inputs:{},fields:{},next:null,topLevel:r,parent:n,shadow:"shadow"==t.name,x:t.attribs.x,y:t.attribs.y};e[o.id]=o;for(var s=0;s<t.children.length;s++){for(var a=t.children[s],u=null,c=null,p=0;p<a.children.length;p++){var h=a.children[p];if(h.name){var l=h.name.toLowerCase();"block"==l?u=h:"shadow"==l&&(c=h)}}switch(!u&&c&&(u=c),a.name.toLowerCase()){case"field":var f=a.attribs.name,d="";d=a.children.length>0&&a.children[0].data?a.children[0].data:"",o.fields[f]={name:f,value:d};break;case"value":case"statement":i(u,e,!1,o.id),c&&u!=c&&i(c,e,!1,o.id);var g=a.attribs.name;o.inputs[g]={name:g,block:u.attribs.id,shadow:c?c.attribs.id:null};break;case"next":if(!u||!u.attribs)continue;i(u,e,!1,o.id),o.next=u.attribs.id}}}var o=r(36);t.exports=function(t){if("object"==typeof t&&"object"==typeof t.xml)return n(o.parseDOM(t.xml.outerHTML))}},function(t,e,r){function n(e,r){return delete t.exports[e],t.exports[e]=r,r}var i=r(37),o=r(44);t.exports={Parser:i,Tokenizer:r(38),ElementType:r(45),DomHandler:o,get FeedHandler(){return n("FeedHandler",r(48))},get Stream(){return n("Stream",r(49))},get WritableStream(){return n("WritableStream",r(50))},get ProxyHandler(){return n("ProxyHandler",r(71))},get DomUtils(){return n("DomUtils",r(72))},get CollectingHandler(){return n("CollectingHandler",r(84))},DefaultHandler:o,get RssHandler(){return n("RssHandler",this.FeedHandler)},parseDOM:function(t,e){var r=new o(e);return new i(r,e).end(t),r.dom},parseFeed:function(e,r){var n=new t.exports.FeedHandler(r);return new i(n,r).end(e),n.dom},createDomStream:function(t,e,r){var n=new o(t,e,r);return new i(n,e)},EVENTS:{attribute:2,cdatastart:0,cdataend:0,text:1,processinginstruction:2,comment:1,commentend:0,closetag:1,opentag:2,opentagname:1,error:1,end:0}}},function(t,e,r){function n(t,e){this._options=e||{},this._cbs=t||{},this._tagname="",this._attribname="",this._attribvalue="",this._attribs=null,this._stack=[],this.startIndex=0,this.endIndex=null,this._lowerCaseTagNames="lowerCaseTags"in this._options?!!this._options.lowerCaseTags:!this._options.xmlMode,this._lowerCaseAttributeNames="lowerCaseAttributeNames"in this._options?!!this._options.lowerCaseAttributeNames:!this._options.xmlMode,this._options.Tokenizer&&(i=this._options.Tokenizer),this._tokenizer=new i(this._options,this),this._cbs.onparserinit&&this._cbs.onparserinit(this)}var i=r(38),o={input:!0,option:!0,optgroup:!0,select:!0,button:!0,datalist:!0,textarea:!0},s={tr:{tr:!0,th:!0,td:!0},th:{th:!0},td:{thead:!0,th:!0,td:!0},body:{head:!0,link:!0,script:!0},li:{li:!0},p:{p:!0},h1:{p:!0},h2:{p:!0},h3:{p:!0},h4:{p:!0},h5:{p:!0},h6:{p:!0},select:o,input:o,output:o,button:o,datalist:o,textarea:o,option:{option:!0},optgroup:{optgroup:!0}},a={__proto__:null,area:!0,base:!0,basefont:!0,br:!0,col:!0,command:!0,embed:!0,frame:!0,hr:!0,img:!0,input:!0,isindex:!0,keygen:!0,link:!0,meta:!0,param:!0,source:!0,track:!0,wbr:!0,path:!0,circle:!0,ellipse:!0,line:!0,rect:!0,use:!0,stop:!0,polyline:!0,polygon:!0},u=/\s|\//;r(2).inherits(n,r(1).EventEmitter),n.prototype._updatePosition=function(t){null===this.endIndex?this._tokenizer._sectionStart<=t?this.startIndex=0:this.startIndex=this._tokenizer._sectionStart-t:this.startIndex=this.endIndex+1,this.endIndex=this._tokenizer.getAbsoluteIndex()},n.prototype.ontext=function(t){this._updatePosition(1),this.endIndex--,this._cbs.ontext&&this._cbs.ontext(t)},n.prototype.onopentagname=function(t){if(this._lowerCaseTagNames&&(t=t.toLowerCase()),this._tagname=t,!this._options.xmlMode&&t in s)for(var e;(e=this._stack[this._stack.length-1])in s[t];this.onclosetag(e));!this._options.xmlMode&&t in a||this._stack.push(t),this._cbs.onopentagname&&this._cbs.onopentagname(t),this._cbs.onopentag&&(this._attribs={})},n.prototype.onopentagend=function(){this._updatePosition(1),this._attribs&&(this._cbs.onopentag&&this._cbs.onopentag(this._tagname,this._attribs),this._attribs=null),!this._options.xmlMode&&this._cbs.onclosetag&&this._tagname in a&&this._cbs.onclosetag(this._tagname),this._tagname=""},n.prototype.onclosetag=function(t){if(this._updatePosition(1),this._lowerCaseTagNames&&(t=t.toLowerCase()),!this._stack.length||t in a&&!this._options.xmlMode)this._options.xmlMode||"br"!==t&&"p"!==t||(this.onopentagname(t),this._closeCurrentTag());else{var e=this._stack.lastIndexOf(t);if(e!==-1)if(this._cbs.onclosetag)for(e=this._stack.length-e;e--;)this._cbs.onclosetag(this._stack.pop());else this._stack.length=e;else"p"!==t||this._options.xmlMode||(this.onopentagname(t),this._closeCurrentTag())}},n.prototype.onselfclosingtag=function(){this._options.xmlMode||this._options.recognizeSelfClosing?this._closeCurrentTag():this.onopentagend()},n.prototype._closeCurrentTag=function(){var t=this._tagname;this.onopentagend(),this._stack[this._stack.length-1]===t&&(this._cbs.onclosetag&&this._cbs.onclosetag(t),this._stack.pop())},n.prototype.onattribname=function(t){this._lowerCaseAttributeNames&&(t=t.toLowerCase()),this._attribname=t},n.prototype.onattribdata=function(t){this._attribvalue+=t},n.prototype.onattribend=function(){this._cbs.onattribute&&this._cbs.onattribute(this._attribname,this._attribvalue),this._attribs&&!Object.prototype.hasOwnProperty.call(this._attribs,this._attribname)&&(this._attribs[this._attribname]=this._attribvalue),this._attribname="",this._attribvalue=""},n.prototype._getInstructionName=function(t){var e=t.search(u),r=e<0?t:t.substr(0,e);return this._lowerCaseTagNames&&(r=r.toLowerCase()),r},n.prototype.ondeclaration=function(t){if(this._cbs.onprocessinginstruction){var e=this._getInstructionName(t);this._cbs.onprocessinginstruction("!"+e,"!"+t)}},n.prototype.onprocessinginstruction=function(t){if(this._cbs.onprocessinginstruction){var e=this._getInstructionName(t);this._cbs.onprocessinginstruction("?"+e,"?"+t)}},n.prototype.oncomment=function(t){this._updatePosition(4),this._cbs.oncomment&&this._cbs.oncomment(t),this._cbs.oncommentend&&this._cbs.oncommentend()},n.prototype.oncdata=function(t){this._updatePosition(1),this._options.xmlMode||this._options.recognizeCDATA?(this._cbs.oncdatastart&&this._cbs.oncdatastart(),this._cbs.ontext&&this._cbs.ontext(t),this._cbs.oncdataend&&this._cbs.oncdataend()):this.oncomment("[CDATA["+t+"]]")},n.prototype.onerror=function(t){this._cbs.onerror&&this._cbs.onerror(t)},n.prototype.onend=function(){if(this._cbs.onclosetag)for(var t=this._stack.length;t>0;this._cbs.onclosetag(this._stack[--t]));this._cbs.onend&&this._cbs.onend()},n.prototype.reset=function(){this._cbs.onreset&&this._cbs.onreset(),this._tokenizer.reset(),this._tagname="",this._attribname="",this._attribs=null,this._stack=[],this._cbs.onparserinit&&this._cbs.onparserinit(this)},n.prototype.parseComplete=function(t){this.reset(),this.end(t)},n.prototype.write=function(t){this._tokenizer.write(t)},n.prototype.end=function(t){this._tokenizer.end(t)},n.prototype.pause=function(){this._tokenizer.pause()},n.prototype.resume=function(){this._tokenizer.resume()},n.prototype.parseChunk=n.prototype.write,n.prototype.done=n.prototype.end,t.exports=n},function(t,e,r){function n(t){return" "===t||"\n"===t||"\t"===t||"\f"===t||"\r"===t}function i(t,e){return function(r){r===t&&(this._state=e)}}function o(t,e,r){var n=t.toLowerCase();return t===n?function(t){t===n?this._state=e:(this._state=r,this._index--)}:function(i){i===n||i===t?this._state=e:(this._state=r,this._index--)}}function s(t,e){var r=t.toLowerCase();return function(n){n===r||n===t?this._state=e:(this._state=g,this._index--)}}function a(t,e){this._state=f,this._buffer="",this._sectionStart=0,this._index=0,this._bufferOffset=0,this._baseState=f,this._special=gt,this._cbs=e,this._running=!0,this._ended=!1,this._xmlMode=!(!t||!t.xmlMode),this._decodeEntities=!(!t||!t.decodeEntities)}t.exports=a;var u=r(39),c=r(41),p=r(42),h=r(43),l=0,f=l++,d=l++,g=l++,m=l++,_=l++,y=l++,b=l++,v=l++,w=l++,S=l++,k=l++,T=l++,E=l++,x=l++,N=l++,O=l++,A=l++,C=l++,M=l++,L=l++,R=l++,D=l++,I=l++,B=l++,P=l++,U=l++,q=l++,F=l++,j=l++,G=l++,V=l++,H=l++,Y=l++,z=l++,X=l++,W=l++,K=l++,Q=l++,J=l++,Z=l++,$=l++,tt=l++,et=l++,rt=l++,nt=l++,it=l++,ot=l++,st=l++,at=l++,ut=l++,ct=l++,pt=l++,ht=l++,lt=l++,ft=l++,dt=0,gt=dt++,mt=dt++,_t=dt++;a.prototype._stateText=function(t){"<"===t?(this._index>this._sectionStart&&this._cbs.ontext(this._getSection()),this._state=d,this._sectionStart=this._index):this._decodeEntities&&this._special===gt&&"&"===t&&(this._index>this._sectionStart&&this._cbs.ontext(this._getSection()),this._baseState=f,this._state=ct,this._sectionStart=this._index)},a.prototype._stateBeforeTagName=function(t){"/"===t?this._state=_:">"===t||this._special!==gt||n(t)?this._state=f:"!"===t?(this._state=N,this._sectionStart=this._index+1):"?"===t?(this._state=A,this._sectionStart=this._index+1):"<"===t?(this._cbs.ontext(this._getSection()),this._sectionStart=this._index):(this._state=this._xmlMode||"s"!==t&&"S"!==t?g:V,this._sectionStart=this._index)},a.prototype._stateInTagName=function(t){("/"===t||">"===t||n(t))&&(this._emitToken("onopentagname"),this._state=v,this._index--)},a.prototype._stateBeforeCloseingTagName=function(t){n(t)||(">"===t?this._state=f:this._special!==gt?"s"===t||"S"===t?this._state=H:(this._state=f,
+this._index--):(this._state=y,this._sectionStart=this._index))},a.prototype._stateInCloseingTagName=function(t){(">"===t||n(t))&&(this._emitToken("onclosetag"),this._state=b,this._index--)},a.prototype._stateAfterCloseingTagName=function(t){">"===t&&(this._state=f,this._sectionStart=this._index+1)},a.prototype._stateBeforeAttributeName=function(t){">"===t?(this._cbs.onopentagend(),this._state=f,this._sectionStart=this._index+1):"/"===t?this._state=m:n(t)||(this._state=w,this._sectionStart=this._index)},a.prototype._stateInSelfClosingTag=function(t){">"===t?(this._cbs.onselfclosingtag(),this._state=f,this._sectionStart=this._index+1):n(t)||(this._state=v,this._index--)},a.prototype._stateInAttributeName=function(t){("="===t||"/"===t||">"===t||n(t))&&(this._cbs.onattribname(this._getSection()),this._sectionStart=-1,this._state=S,this._index--)},a.prototype._stateAfterAttributeName=function(t){"="===t?this._state=k:"/"===t||">"===t?(this._cbs.onattribend(),this._state=v,this._index--):n(t)||(this._cbs.onattribend(),this._state=w,this._sectionStart=this._index)},a.prototype._stateBeforeAttributeValue=function(t){'"'===t?(this._state=T,this._sectionStart=this._index+1):"'"===t?(this._state=E,this._sectionStart=this._index+1):n(t)||(this._state=x,this._sectionStart=this._index,this._index--)},a.prototype._stateInAttributeValueDoubleQuotes=function(t){'"'===t?(this._emitToken("onattribdata"),this._cbs.onattribend(),this._state=v):this._decodeEntities&&"&"===t&&(this._emitToken("onattribdata"),this._baseState=this._state,this._state=ct,this._sectionStart=this._index)},a.prototype._stateInAttributeValueSingleQuotes=function(t){"'"===t?(this._emitToken("onattribdata"),this._cbs.onattribend(),this._state=v):this._decodeEntities&&"&"===t&&(this._emitToken("onattribdata"),this._baseState=this._state,this._state=ct,this._sectionStart=this._index)},a.prototype._stateInAttributeValueNoQuotes=function(t){n(t)||">"===t?(this._emitToken("onattribdata"),this._cbs.onattribend(),this._state=v,this._index--):this._decodeEntities&&"&"===t&&(this._emitToken("onattribdata"),this._baseState=this._state,this._state=ct,this._sectionStart=this._index)},a.prototype._stateBeforeDeclaration=function(t){this._state="["===t?D:"-"===t?C:O},a.prototype._stateInDeclaration=function(t){">"===t&&(this._cbs.ondeclaration(this._getSection()),this._state=f,this._sectionStart=this._index+1)},a.prototype._stateInProcessingInstruction=function(t){">"===t&&(this._cbs.onprocessinginstruction(this._getSection()),this._state=f,this._sectionStart=this._index+1)},a.prototype._stateBeforeComment=function(t){"-"===t?(this._state=M,this._sectionStart=this._index+1):this._state=O},a.prototype._stateInComment=function(t){"-"===t&&(this._state=L)},a.prototype._stateAfterComment1=function(t){"-"===t?this._state=R:this._state=M},a.prototype._stateAfterComment2=function(t){">"===t?(this._cbs.oncomment(this._buffer.substring(this._sectionStart,this._index-2)),this._state=f,this._sectionStart=this._index+1):"-"!==t&&(this._state=M)},a.prototype._stateBeforeCdata1=o("C",I,O),a.prototype._stateBeforeCdata2=o("D",B,O),a.prototype._stateBeforeCdata3=o("A",P,O),a.prototype._stateBeforeCdata4=o("T",U,O),a.prototype._stateBeforeCdata5=o("A",q,O),a.prototype._stateBeforeCdata6=function(t){"["===t?(this._state=F,this._sectionStart=this._index+1):(this._state=O,this._index--)},a.prototype._stateInCdata=function(t){"]"===t&&(this._state=j)},a.prototype._stateAfterCdata1=i("]",G),a.prototype._stateAfterCdata2=function(t){">"===t?(this._cbs.oncdata(this._buffer.substring(this._sectionStart,this._index-2)),this._state=f,this._sectionStart=this._index+1):"]"!==t&&(this._state=F)},a.prototype._stateBeforeSpecial=function(t){"c"===t||"C"===t?this._state=Y:"t"===t||"T"===t?this._state=et:(this._state=g,this._index--)},a.prototype._stateBeforeSpecialEnd=function(t){this._special!==mt||"c"!==t&&"C"!==t?this._special!==_t||"t"!==t&&"T"!==t?this._state=f:this._state=ot:this._state=Q},a.prototype._stateBeforeScript1=s("R",z),a.prototype._stateBeforeScript2=s("I",X),a.prototype._stateBeforeScript3=s("P",W),a.prototype._stateBeforeScript4=s("T",K),a.prototype._stateBeforeScript5=function(t){("/"===t||">"===t||n(t))&&(this._special=mt),this._state=g,this._index--},a.prototype._stateAfterScript1=o("R",J,f),a.prototype._stateAfterScript2=o("I",Z,f),a.prototype._stateAfterScript3=o("P",$,f),a.prototype._stateAfterScript4=o("T",tt,f),a.prototype._stateAfterScript5=function(t){">"===t||n(t)?(this._special=gt,this._state=y,this._sectionStart=this._index-6,this._index--):this._state=f},a.prototype._stateBeforeStyle1=s("Y",rt),a.prototype._stateBeforeStyle2=s("L",nt),a.prototype._stateBeforeStyle3=s("E",it),a.prototype._stateBeforeStyle4=function(t){("/"===t||">"===t||n(t))&&(this._special=_t),this._state=g,this._index--},a.prototype._stateAfterStyle1=o("Y",st,f),a.prototype._stateAfterStyle2=o("L",at,f),a.prototype._stateAfterStyle3=o("E",ut,f),a.prototype._stateAfterStyle4=function(t){">"===t||n(t)?(this._special=gt,this._state=y,this._sectionStart=this._index-5,this._index--):this._state=f},a.prototype._stateBeforeEntity=o("#",pt,ht),a.prototype._stateBeforeNumericEntity=o("X",ft,lt),a.prototype._parseNamedEntityStrict=function(){if(this._sectionStart+1<this._index){var t=this._buffer.substring(this._sectionStart+1,this._index),e=this._xmlMode?h:c;e.hasOwnProperty(t)&&(this._emitPartial(e[t]),this._sectionStart=this._index+1)}},a.prototype._parseLegacyEntity=function(){var t=this._sectionStart+1,e=this._index-t;for(e>6&&(e=6);e>=2;){var r=this._buffer.substr(t,e);if(p.hasOwnProperty(r))return this._emitPartial(p[r]),void(this._sectionStart+=e+1);e--}},a.prototype._stateInNamedEntity=function(t){";"===t?(this._parseNamedEntityStrict(),this._sectionStart+1<this._index&&!this._xmlMode&&this._parseLegacyEntity(),this._state=this._baseState):(t<"a"||t>"z")&&(t<"A"||t>"Z")&&(t<"0"||t>"9")&&(this._xmlMode||this._sectionStart+1===this._index||(this._baseState!==f?"="!==t&&this._parseNamedEntityStrict():this._parseLegacyEntity()),this._state=this._baseState,this._index--)},a.prototype._decodeNumericEntity=function(t,e){var r=this._sectionStart+t;if(r!==this._index){var n=this._buffer.substring(r,this._index),i=parseInt(n,e);this._emitPartial(u(i)),this._sectionStart=this._index}else this._sectionStart--;this._state=this._baseState},a.prototype._stateInNumericEntity=function(t){";"===t?(this._decodeNumericEntity(2,10),this._sectionStart++):(t<"0"||t>"9")&&(this._xmlMode?this._state=this._baseState:this._decodeNumericEntity(2,10),this._index--)},a.prototype._stateInHexEntity=function(t){";"===t?(this._decodeNumericEntity(3,16),this._sectionStart++):(t<"a"||t>"f")&&(t<"A"||t>"F")&&(t<"0"||t>"9")&&(this._xmlMode?this._state=this._baseState:this._decodeNumericEntity(3,16),this._index--)},a.prototype._cleanup=function(){this._sectionStart<0?(this._buffer="",this._index=0,this._bufferOffset+=this._index):this._running&&(this._state===f?(this._sectionStart!==this._index&&this._cbs.ontext(this._buffer.substr(this._sectionStart)),this._buffer="",this._index=0,this._bufferOffset+=this._index):this._sectionStart===this._index?(this._buffer="",this._index=0,this._bufferOffset+=this._index):(this._buffer=this._buffer.substr(this._sectionStart),this._index-=this._sectionStart,this._bufferOffset+=this._sectionStart),this._sectionStart=0)},a.prototype.write=function(t){this._ended&&this._cbs.onerror(Error(".write() after done!")),this._buffer+=t,this._parse()},a.prototype._parse=function(){for(;this._index<this._buffer.length&&this._running;){var t=this._buffer.charAt(this._index);this._state===f?this._stateText(t):this._state===d?this._stateBeforeTagName(t):this._state===g?this._stateInTagName(t):this._state===_?this._stateBeforeCloseingTagName(t):this._state===y?this._stateInCloseingTagName(t):this._state===b?this._stateAfterCloseingTagName(t):this._state===m?this._stateInSelfClosingTag(t):this._state===v?this._stateBeforeAttributeName(t):this._state===w?this._stateInAttributeName(t):this._state===S?this._stateAfterAttributeName(t):this._state===k?this._stateBeforeAttributeValue(t):this._state===T?this._stateInAttributeValueDoubleQuotes(t):this._state===E?this._stateInAttributeValueSingleQuotes(t):this._state===x?this._stateInAttributeValueNoQuotes(t):this._state===N?this._stateBeforeDeclaration(t):this._state===O?this._stateInDeclaration(t):this._state===A?this._stateInProcessingInstruction(t):this._state===C?this._stateBeforeComment(t):this._state===M?this._stateInComment(t):this._state===L?this._stateAfterComment1(t):this._state===R?this._stateAfterComment2(t):this._state===D?this._stateBeforeCdata1(t):this._state===I?this._stateBeforeCdata2(t):this._state===B?this._stateBeforeCdata3(t):this._state===P?this._stateBeforeCdata4(t):this._state===U?this._stateBeforeCdata5(t):this._state===q?this._stateBeforeCdata6(t):this._state===F?this._stateInCdata(t):this._state===j?this._stateAfterCdata1(t):this._state===G?this._stateAfterCdata2(t):this._state===V?this._stateBeforeSpecial(t):this._state===H?this._stateBeforeSpecialEnd(t):this._state===Y?this._stateBeforeScript1(t):this._state===z?this._stateBeforeScript2(t):this._state===X?this._stateBeforeScript3(t):this._state===W?this._stateBeforeScript4(t):this._state===K?this._stateBeforeScript5(t):this._state===Q?this._stateAfterScript1(t):this._state===J?this._stateAfterScript2(t):this._state===Z?this._stateAfterScript3(t):this._state===$?this._stateAfterScript4(t):this._state===tt?this._stateAfterScript5(t):this._state===et?this._stateBeforeStyle1(t):this._state===rt?this._stateBeforeStyle2(t):this._state===nt?this._stateBeforeStyle3(t):this._state===it?this._stateBeforeStyle4(t):this._state===ot?this._stateAfterStyle1(t):this._state===st?this._stateAfterStyle2(t):this._state===at?this._stateAfterStyle3(t):this._state===ut?this._stateAfterStyle4(t):this._state===ct?this._stateBeforeEntity(t):this._state===pt?this._stateBeforeNumericEntity(t):this._state===ht?this._stateInNamedEntity(t):this._state===lt?this._stateInNumericEntity(t):this._state===ft?this._stateInHexEntity(t):this._cbs.onerror(Error("unknown _state"),this._state),this._index++}this._cleanup()},a.prototype.pause=function(){this._running=!1},a.prototype.resume=function(){this._running=!0,this._index<this._buffer.length&&this._parse(),this._ended&&this._finish()},a.prototype.end=function(t){this._ended&&this._cbs.onerror(Error(".end() after done!")),t&&this.write(t),this._ended=!0,this._running&&this._finish()},a.prototype._finish=function(){this._sectionStart<this._index&&this._handleTrailingData(),this._cbs.onend()},a.prototype._handleTrailingData=function(){var t=this._buffer.substr(this._sectionStart);this._state===F||this._state===j||this._state===G?this._cbs.oncdata(t):this._state===M||this._state===L||this._state===R?this._cbs.oncomment(t):this._state!==ht||this._xmlMode?this._state!==lt||this._xmlMode?this._state!==ft||this._xmlMode?this._state!==g&&this._state!==v&&this._state!==k&&this._state!==S&&this._state!==w&&this._state!==E&&this._state!==T&&this._state!==x&&this._state!==y&&this._cbs.ontext(t):(this._decodeNumericEntity(3,16),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData())):(this._decodeNumericEntity(2,10),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData())):(this._parseLegacyEntity(),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData()))},a.prototype.reset=function(){a.call(this,{xmlMode:this._xmlMode,decodeEntities:this._decodeEntities},this._cbs)},a.prototype.getAbsoluteIndex=function(){return this._bufferOffset+this._index},a.prototype._getSection=function(){return this._buffer.substring(this._sectionStart,this._index)},a.prototype._emitToken=function(t){this._cbs[t](this._getSection()),this._sectionStart=-1},a.prototype._emitPartial=function(t){this._baseState!==f?this._cbs.onattribdata(t):this._cbs.ontext(t)}},function(t,e,r){function n(t){if(t>=55296&&t<=57343||t>1114111)return"�";t in i&&(t=i[t]);var e="";return t>65535&&(t-=65536,e+=String.fromCharCode(t>>>10&1023|55296),t=56320|1023&t),e+=String.fromCharCode(t)}var i=r(40);t.exports=n},function(t,e){t.exports={0:65533,128:8364,130:8218,131:402,132:8222,133:8230,134:8224,135:8225,136:710,137:8240,138:352,139:8249,140:338,142:381,145:8216,146:8217,147:8220,148:8221,149:8226,150:8211,151:8212,152:732,153:8482,154:353,155:8250,156:339,158:382,159:376}},function(t,e){t.exports={Aacute:"Á",aacute:"á",Abreve:"Ă",abreve:"ă",ac:"∾",acd:"∿",acE:"∾̳",Acirc:"Â",acirc:"â",acute:"´",Acy:"А",acy:"а",AElig:"Æ",aelig:"æ",af:"⁡",Afr:"𝔄",afr:"𝔞",Agrave:"À",agrave:"à",alefsym:"ℵ",aleph:"ℵ",Alpha:"Α",alpha:"α",Amacr:"Ā",amacr:"ā",amalg:"⨿",amp:"&",AMP:"&",andand:"⩕",And:"⩓",and:"∧",andd:"⩜",andslope:"⩘",andv:"⩚",ang:"∠",ange:"⦤",angle:"∠",angmsdaa:"⦨",angmsdab:"⦩",angmsdac:"⦪",angmsdad:"⦫",angmsdae:"⦬",angmsdaf:"⦭",angmsdag:"⦮",angmsdah:"⦯",angmsd:"∡",angrt:"∟",angrtvb:"⊾",angrtvbd:"⦝",angsph:"∢",angst:"Å",angzarr:"⍼",Aogon:"Ą",aogon:"ą",Aopf:"𝔸",aopf:"𝕒",apacir:"⩯",ap:"≈",apE:"⩰",ape:"≊",apid:"≋",apos:"'",ApplyFunction:"⁡",approx:"≈",approxeq:"≊",Aring:"Å",aring:"å",Ascr:"𝒜",ascr:"𝒶",Assign:"≔",ast:"*",asymp:"≈",asympeq:"≍",Atilde:"Ã",atilde:"ã",Auml:"Ä",auml:"ä",awconint:"∳",awint:"⨑",backcong:"≌",backepsilon:"϶",backprime:"‵",backsim:"∽",backsimeq:"⋍",Backslash:"∖",Barv:"⫧",barvee:"⊽",barwed:"⌅",Barwed:"⌆",barwedge:"⌅",bbrk:"⎵",bbrktbrk:"⎶",bcong:"≌",Bcy:"Б",bcy:"б",bdquo:"„",becaus:"∵",because:"∵",Because:"∵",bemptyv:"⦰",bepsi:"϶",bernou:"ℬ",Bernoullis:"ℬ",Beta:"Β",beta:"β",beth:"ℶ",between:"≬",Bfr:"𝔅",bfr:"𝔟",bigcap:"⋂",bigcirc:"◯",bigcup:"⋃",bigodot:"⨀",bigoplus:"⨁",bigotimes:"⨂",bigsqcup:"⨆",bigstar:"★",bigtriangledown:"▽",bigtriangleup:"△",biguplus:"⨄",bigvee:"⋁",bigwedge:"⋀",bkarow:"⤍",blacklozenge:"⧫",blacksquare:"▪",blacktriangle:"▴",blacktriangledown:"▾",blacktriangleleft:"◂",blacktriangleright:"▸",blank:"␣",blk12:"▒",blk14:"░",blk34:"▓",block:"█",bne:"=⃥",bnequiv:"≡⃥",bNot:"⫭",bnot:"⌐",Bopf:"𝔹",bopf:"𝕓",bot:"⊥",bottom:"⊥",bowtie:"⋈",boxbox:"⧉",boxdl:"┐",boxdL:"╕",boxDl:"╖",boxDL:"╗",boxdr:"┌",boxdR:"╒",boxDr:"╓",boxDR:"╔",boxh:"─",boxH:"═",boxhd:"┬",boxHd:"╤",boxhD:"╥",boxHD:"╦",boxhu:"┴",boxHu:"╧",boxhU:"╨",boxHU:"╩",boxminus:"⊟",boxplus:"⊞",boxtimes:"⊠",boxul:"┘",boxuL:"╛",boxUl:"╜",boxUL:"╝",boxur:"└",boxuR:"╘",boxUr:"╙",boxUR:"╚",boxv:"│",boxV:"║",boxvh:"┼",boxvH:"╪",boxVh:"╫",boxVH:"╬",boxvl:"┤",boxvL:"╡",boxVl:"╢",boxVL:"╣",boxvr:"├",boxvR:"╞",boxVr:"╟",boxVR:"╠",bprime:"‵",breve:"˘",Breve:"˘",brvbar:"¦",bscr:"𝒷",Bscr:"ℬ",bsemi:"⁏",bsim:"∽",bsime:"⋍",bsolb:"⧅",bsol:"\\",bsolhsub:"⟈",bull:"•",bullet:"•",bump:"≎",bumpE:"⪮",bumpe:"≏",Bumpeq:"≎",bumpeq:"≏",Cacute:"Ć",cacute:"ć",capand:"⩄",capbrcup:"⩉",capcap:"⩋",cap:"∩",Cap:"⋒",capcup:"⩇",capdot:"⩀",CapitalDifferentialD:"ⅅ",caps:"∩︀",caret:"⁁",caron:"ˇ",Cayleys:"ℭ",ccaps:"⩍",Ccaron:"Č",ccaron:"č",Ccedil:"Ç",ccedil:"ç",Ccirc:"Ĉ",ccirc:"ĉ",Cconint:"∰",ccups:"⩌",ccupssm:"⩐",Cdot:"Ċ",cdot:"ċ",cedil:"¸",Cedilla:"¸",cemptyv:"⦲",cent:"¢",centerdot:"·",CenterDot:"·",cfr:"𝔠",Cfr:"ℭ",CHcy:"Ч",chcy:"ч",check:"✓",checkmark:"✓",Chi:"Χ",chi:"χ",circ:"ˆ",circeq:"≗",circlearrowleft:"↺",circlearrowright:"↻",circledast:"⊛",circledcirc:"⊚",circleddash:"⊝",CircleDot:"⊙",circledR:"®",circledS:"Ⓢ",CircleMinus:"⊖",CirclePlus:"⊕",CircleTimes:"⊗",cir:"○",cirE:"⧃",cire:"≗",cirfnint:"⨐",cirmid:"⫯",cirscir:"⧂",ClockwiseContourIntegral:"∲",CloseCurlyDoubleQuote:"”",CloseCurlyQuote:"’",clubs:"♣",clubsuit:"♣",colon:":",Colon:"∷",Colone:"⩴",colone:"≔",coloneq:"≔",comma:",",commat:"@",comp:"∁",compfn:"∘",complement:"∁",complexes:"ℂ",cong:"≅",congdot:"⩭",Congruent:"≡",conint:"∮",Conint:"∯",ContourIntegral:"∮",copf:"𝕔",Copf:"ℂ",coprod:"∐",Coproduct:"∐",copy:"©",COPY:"©",copysr:"℗",CounterClockwiseContourIntegral:"∳",crarr:"↵",cross:"✗",Cross:"⨯",Cscr:"𝒞",cscr:"𝒸",csub:"⫏",csube:"⫑",csup:"⫐",csupe:"⫒",ctdot:"⋯",cudarrl:"⤸",cudarrr:"⤵",cuepr:"⋞",cuesc:"⋟",cularr:"↶",cularrp:"⤽",cupbrcap:"⩈",cupcap:"⩆",CupCap:"≍",cup:"∪",Cup:"⋓",cupcup:"⩊",cupdot:"⊍",cupor:"⩅",cups:"∪︀",curarr:"↷",curarrm:"⤼",curlyeqprec:"⋞",curlyeqsucc:"⋟",curlyvee:"⋎",curlywedge:"⋏",curren:"¤",curvearrowleft:"↶",curvearrowright:"↷",cuvee:"⋎",cuwed:"⋏",cwconint:"∲",cwint:"∱",cylcty:"⌭",dagger:"†",Dagger:"‡",daleth:"ℸ",darr:"↓",Darr:"↡",dArr:"⇓",dash:"‐",Dashv:"⫤",dashv:"⊣",dbkarow:"⤏",dblac:"˝",Dcaron:"Ď",dcaron:"ď",Dcy:"Д",dcy:"д",ddagger:"‡",ddarr:"⇊",DD:"ⅅ",dd:"ⅆ",DDotrahd:"⤑",ddotseq:"⩷",deg:"°",Del:"∇",Delta:"Δ",delta:"δ",demptyv:"⦱",dfisht:"⥿",Dfr:"𝔇",dfr:"𝔡",dHar:"⥥",dharl:"⇃",dharr:"⇂",DiacriticalAcute:"´",DiacriticalDot:"˙",DiacriticalDoubleAcute:"˝",DiacriticalGrave:"`",DiacriticalTilde:"˜",diam:"⋄",diamond:"⋄",Diamond:"⋄",diamondsuit:"♦",diams:"♦",die:"¨",DifferentialD:"ⅆ",digamma:"ϝ",disin:"⋲",div:"÷",divide:"÷",divideontimes:"⋇",divonx:"⋇",DJcy:"Ђ",djcy:"ђ",dlcorn:"⌞",dlcrop:"⌍",dollar:"$",Dopf:"𝔻",dopf:"𝕕",Dot:"¨",dot:"˙",DotDot:"⃜",doteq:"≐",doteqdot:"≑",DotEqual:"≐",dotminus:"∸",dotplus:"∔",dotsquare:"⊡",doublebarwedge:"⌆",DoubleContourIntegral:"∯",DoubleDot:"¨",DoubleDownArrow:"⇓",DoubleLeftArrow:"⇐",DoubleLeftRightArrow:"⇔",DoubleLeftTee:"⫤",DoubleLongLeftArrow:"⟸",DoubleLongLeftRightArrow:"⟺",DoubleLongRightArrow:"⟹",DoubleRightArrow:"⇒",DoubleRightTee:"⊨",DoubleUpArrow:"⇑",DoubleUpDownArrow:"⇕",DoubleVerticalBar:"∥",DownArrowBar:"⤓",downarrow:"↓",DownArrow:"↓",Downarrow:"⇓",DownArrowUpArrow:"⇵",DownBreve:"̑",downdownarrows:"⇊",downharpoonleft:"⇃",downharpoonright:"⇂",DownLeftRightVector:"⥐",DownLeftTeeVector:"⥞",DownLeftVectorBar:"⥖",DownLeftVector:"↽",DownRightTeeVector:"⥟",DownRightVectorBar:"⥗",DownRightVector:"⇁",DownTeeArrow:"↧",DownTee:"⊤",drbkarow:"⤐",drcorn:"⌟",drcrop:"⌌",Dscr:"𝒟",dscr:"𝒹",DScy:"Ѕ",dscy:"ѕ",dsol:"⧶",Dstrok:"Đ",dstrok:"đ",dtdot:"⋱",dtri:"▿",dtrif:"▾",duarr:"⇵",duhar:"⥯",dwangle:"⦦",DZcy:"Џ",dzcy:"џ",dzigrarr:"⟿",Eacute:"É",eacute:"é",easter:"⩮",Ecaron:"Ě",ecaron:"ě",Ecirc:"Ê",ecirc:"ê",ecir:"≖",ecolon:"≕",Ecy:"Э",ecy:"э",eDDot:"⩷",Edot:"Ė",edot:"ė",eDot:"≑",ee:"ⅇ",efDot:"≒",Efr:"𝔈",efr:"𝔢",eg:"⪚",Egrave:"È",egrave:"è",egs:"⪖",egsdot:"⪘",el:"⪙",Element:"∈",elinters:"⏧",ell:"ℓ",els:"⪕",elsdot:"⪗",Emacr:"Ē",emacr:"ē",empty:"∅",emptyset:"∅",EmptySmallSquare:"◻",emptyv:"∅",EmptyVerySmallSquare:"▫",emsp13:" ",emsp14:" ",emsp:" ",ENG:"Ŋ",eng:"ŋ",ensp:" ",Eogon:"Ę",eogon:"ę",Eopf:"𝔼",eopf:"𝕖",epar:"⋕",eparsl:"⧣",eplus:"⩱",epsi:"ε",Epsilon:"Ε",epsilon:"ε",epsiv:"ϵ",eqcirc:"≖",eqcolon:"≕",eqsim:"≂",eqslantgtr:"⪖",eqslantless:"⪕",Equal:"⩵",equals:"=",EqualTilde:"≂",equest:"≟",Equilibrium:"⇌",equiv:"≡",equivDD:"⩸",eqvparsl:"⧥",erarr:"⥱",erDot:"≓",escr:"ℯ",Escr:"ℰ",esdot:"≐",Esim:"⩳",esim:"≂",Eta:"Η",eta:"η",ETH:"Ð",eth:"ð",Euml:"Ë",euml:"ë",euro:"€",excl:"!",exist:"∃",Exists:"∃",expectation:"ℰ",exponentiale:"ⅇ",ExponentialE:"ⅇ",fallingdotseq:"≒",Fcy:"Ф",fcy:"ф",female:"♀",ffilig:"ffi",fflig:"ff",ffllig:"ffl",Ffr:"𝔉",ffr:"𝔣",filig:"fi",FilledSmallSquare:"◼",FilledVerySmallSquare:"▪",fjlig:"fj",flat:"♭",fllig:"fl",fltns:"▱",fnof:"ƒ",Fopf:"𝔽",fopf:"𝕗",forall:"∀",ForAll:"∀",fork:"⋔",forkv:"⫙",Fouriertrf:"ℱ",fpartint:"⨍",frac12:"½",frac13:"⅓",frac14:"¼",frac15:"⅕",frac16:"⅙",frac18:"⅛",frac23:"⅔",frac25:"⅖",frac34:"¾",frac35:"⅗",frac38:"⅜",frac45:"⅘",frac56:"⅚",frac58:"⅝",frac78:"⅞",frasl:"⁄",frown:"⌢",fscr:"𝒻",Fscr:"ℱ",gacute:"ǵ",Gamma:"Γ",gamma:"γ",Gammad:"Ϝ",gammad:"ϝ",gap:"⪆",Gbreve:"Ğ",gbreve:"ğ",Gcedil:"Ģ",Gcirc:"Ĝ",gcirc:"ĝ",Gcy:"Г",gcy:"г",Gdot:"Ġ",gdot:"ġ",ge:"≥",gE:"≧",gEl:"⪌",gel:"⋛",geq:"≥",geqq:"≧",geqslant:"⩾",gescc:"⪩",ges:"⩾",gesdot:"⪀",gesdoto:"⪂",gesdotol:"⪄",gesl:"⋛︀",gesles:"⪔",Gfr:"𝔊",gfr:"𝔤",gg:"≫",Gg:"⋙",ggg:"⋙",gimel:"ℷ",GJcy:"Ѓ",gjcy:"ѓ",gla:"⪥",gl:"≷",glE:"⪒",glj:"⪤",gnap:"⪊",gnapprox:"⪊",gne:"⪈",gnE:"≩",gneq:"⪈",gneqq:"≩",gnsim:"⋧",Gopf:"𝔾",gopf:"𝕘",grave:"`",GreaterEqual:"≥",GreaterEqualLess:"⋛",GreaterFullEqual:"≧",GreaterGreater:"⪢",GreaterLess:"≷",GreaterSlantEqual:"⩾",GreaterTilde:"≳",Gscr:"𝒢",gscr:"ℊ",gsim:"≳",gsime:"⪎",gsiml:"⪐",gtcc:"⪧",gtcir:"⩺",gt:">",GT:">",Gt:"≫",gtdot:"⋗",gtlPar:"⦕",gtquest:"⩼",gtrapprox:"⪆",gtrarr:"⥸",gtrdot:"⋗",gtreqless:"⋛",gtreqqless:"⪌",gtrless:"≷",gtrsim:"≳",gvertneqq:"≩︀",gvnE:"≩︀",Hacek:"ˇ",hairsp:" ",half:"½",hamilt:"ℋ",HARDcy:"Ъ",hardcy:"ъ",harrcir:"⥈",harr:"↔",hArr:"⇔",harrw:"↭",Hat:"^",hbar:"ℏ",Hcirc:"Ĥ",hcirc:"ĥ",hearts:"♥",heartsuit:"♥",hellip:"…",hercon:"⊹",hfr:"𝔥",Hfr:"ℌ",HilbertSpace:"ℋ",hksearow:"⤥",hkswarow:"⤦",hoarr:"⇿",homtht:"∻",hookleftarrow:"↩",hookrightarrow:"↪",hopf:"𝕙",Hopf:"ℍ",horbar:"―",HorizontalLine:"─",hscr:"𝒽",Hscr:"ℋ",hslash:"ℏ",Hstrok:"Ħ",hstrok:"ħ",HumpDownHump:"≎",HumpEqual:"≏",hybull:"⁃",hyphen:"‐",Iacute:"Í",iacute:"í",ic:"⁣",Icirc:"Î",icirc:"î",Icy:"И",icy:"и",Idot:"İ",IEcy:"Е",iecy:"е",iexcl:"¡",iff:"⇔",ifr:"𝔦",Ifr:"ℑ",Igrave:"Ì",igrave:"ì",ii:"ⅈ",iiiint:"⨌",iiint:"∭",iinfin:"⧜",iiota:"℩",IJlig:"IJ",ijlig:"ij",Imacr:"Ī",imacr:"ī",image:"ℑ",ImaginaryI:"ⅈ",imagline:"ℐ",imagpart:"ℑ",imath:"ı",Im:"ℑ",imof:"⊷",imped:"Ƶ",Implies:"⇒",incare:"℅","in":"∈",infin:"∞",infintie:"⧝",inodot:"ı",intcal:"⊺","int":"∫",Int:"∬",integers:"ℤ",Integral:"∫",intercal:"⊺",Intersection:"⋂",intlarhk:"⨗",intprod:"⨼",InvisibleComma:"⁣",InvisibleTimes:"⁢",IOcy:"Ё",iocy:"ё",Iogon:"Į",iogon:"į",Iopf:"𝕀",iopf:"𝕚",Iota:"Ι",iota:"ι",iprod:"⨼",iquest:"¿",iscr:"𝒾",Iscr:"ℐ",isin:"∈",isindot:"⋵",isinE:"⋹",isins:"⋴",isinsv:"⋳",isinv:"∈",it:"⁢",Itilde:"Ĩ",itilde:"ĩ",Iukcy:"І",iukcy:"і",Iuml:"Ï",iuml:"ï",Jcirc:"Ĵ",jcirc:"ĵ",Jcy:"Й",jcy:"й",Jfr:"𝔍",jfr:"𝔧",jmath:"ȷ",Jopf:"𝕁",jopf:"𝕛",Jscr:"𝒥",jscr:"𝒿",Jsercy:"Ј",jsercy:"ј",Jukcy:"Є",jukcy:"є",Kappa:"Κ",kappa:"κ",kappav:"ϰ",Kcedil:"Ķ",kcedil:"ķ",Kcy:"К",kcy:"к",Kfr:"𝔎",kfr:"𝔨",kgreen:"ĸ",KHcy:"Х",khcy:"х",KJcy:"Ќ",kjcy:"ќ",Kopf:"𝕂",kopf:"𝕜",Kscr:"𝒦",kscr:"𝓀",lAarr:"⇚",Lacute:"Ĺ",lacute:"ĺ",laemptyv:"⦴",lagran:"ℒ",Lambda:"Λ",lambda:"λ",lang:"⟨",Lang:"⟪",langd:"⦑",langle:"⟨",lap:"⪅",Laplacetrf:"ℒ",laquo:"«",larrb:"⇤",larrbfs:"⤟",larr:"←",Larr:"↞",lArr:"⇐",larrfs:"⤝",larrhk:"↩",larrlp:"↫",larrpl:"⤹",larrsim:"⥳",larrtl:"↢",latail:"⤙",lAtail:"⤛",lat:"⪫",late:"⪭",lates:"⪭︀",lbarr:"⤌",lBarr:"⤎",lbbrk:"❲",lbrace:"{",lbrack:"[",lbrke:"⦋",lbrksld:"⦏",lbrkslu:"⦍",Lcaron:"Ľ",lcaron:"ľ",Lcedil:"Ļ",lcedil:"ļ",lceil:"⌈",lcub:"{",Lcy:"Л",lcy:"л",ldca:"⤶",ldquo:"“",ldquor:"„",ldrdhar:"⥧",ldrushar:"⥋",ldsh:"↲",le:"≤",lE:"≦",LeftAngleBracket:"⟨",LeftArrowBar:"⇤",leftarrow:"←",LeftArrow:"←",Leftarrow:"⇐",LeftArrowRightArrow:"⇆",leftarrowtail:"↢",LeftCeiling:"⌈",LeftDoubleBracket:"⟦",LeftDownTeeVector:"⥡",LeftDownVectorBar:"⥙",LeftDownVector:"⇃",LeftFloor:"⌊",leftharpoondown:"↽",leftharpoonup:"↼",leftleftarrows:"⇇",leftrightarrow:"↔",LeftRightArrow:"↔",Leftrightarrow:"⇔",leftrightarrows:"⇆",leftrightharpoons:"⇋",leftrightsquigarrow:"↭",LeftRightVector:"⥎",LeftTeeArrow:"↤",LeftTee:"⊣",LeftTeeVector:"⥚",leftthreetimes:"⋋",LeftTriangleBar:"⧏",LeftTriangle:"⊲",LeftTriangleEqual:"⊴",LeftUpDownVector:"⥑",LeftUpTeeVector:"⥠",LeftUpVectorBar:"⥘",LeftUpVector:"↿",LeftVectorBar:"⥒",LeftVector:"↼",lEg:"⪋",leg:"⋚",leq:"≤",leqq:"≦",leqslant:"⩽",lescc:"⪨",les:"⩽",lesdot:"⩿",lesdoto:"⪁",lesdotor:"⪃",lesg:"⋚︀",lesges:"⪓",lessapprox:"⪅",lessdot:"⋖",lesseqgtr:"⋚",lesseqqgtr:"⪋",LessEqualGreater:"⋚",LessFullEqual:"≦",LessGreater:"≶",lessgtr:"≶",LessLess:"⪡",lesssim:"≲",LessSlantEqual:"⩽",LessTilde:"≲",lfisht:"⥼",lfloor:"⌊",Lfr:"𝔏",lfr:"𝔩",lg:"≶",lgE:"⪑",lHar:"⥢",lhard:"↽",lharu:"↼",lharul:"⥪",lhblk:"▄",LJcy:"Љ",ljcy:"љ",llarr:"⇇",ll:"≪",Ll:"⋘",llcorner:"⌞",Lleftarrow:"⇚",llhard:"⥫",lltri:"◺",Lmidot:"Ŀ",lmidot:"ŀ",lmoustache:"⎰",lmoust:"⎰",lnap:"⪉",lnapprox:"⪉",lne:"⪇",lnE:"≨",lneq:"⪇",lneqq:"≨",lnsim:"⋦",loang:"⟬",loarr:"⇽",lobrk:"⟦",longleftarrow:"⟵",LongLeftArrow:"⟵",Longleftarrow:"⟸",longleftrightarrow:"⟷",LongLeftRightArrow:"⟷",Longleftrightarrow:"⟺",longmapsto:"⟼",longrightarrow:"⟶",LongRightArrow:"⟶",Longrightarrow:"⟹",looparrowleft:"↫",looparrowright:"↬",lopar:"⦅",Lopf:"𝕃",lopf:"𝕝",loplus:"⨭",lotimes:"⨴",lowast:"∗",lowbar:"_",LowerLeftArrow:"↙",LowerRightArrow:"↘",loz:"◊",lozenge:"◊",lozf:"⧫",lpar:"(",lparlt:"⦓",lrarr:"⇆",lrcorner:"⌟",lrhar:"⇋",lrhard:"⥭",lrm:"‎",lrtri:"⊿",lsaquo:"‹",lscr:"𝓁",Lscr:"ℒ",lsh:"↰",Lsh:"↰",lsim:"≲",lsime:"⪍",lsimg:"⪏",lsqb:"[",lsquo:"‘",lsquor:"‚",Lstrok:"Ł",lstrok:"ł",ltcc:"⪦",ltcir:"⩹",lt:"<",LT:"<",Lt:"≪",ltdot:"⋖",lthree:"⋋",ltimes:"⋉",ltlarr:"⥶",ltquest:"⩻",ltri:"◃",ltrie:"⊴",ltrif:"◂",ltrPar:"⦖",lurdshar:"⥊",luruhar:"⥦",lvertneqq:"≨︀",lvnE:"≨︀",macr:"¯",male:"♂",malt:"✠",maltese:"✠",Map:"⤅",map:"↦",mapsto:"↦",mapstodown:"↧",mapstoleft:"↤",mapstoup:"↥",marker:"▮",mcomma:"⨩",Mcy:"М",mcy:"м",mdash:"—",mDDot:"∺",measuredangle:"∡",MediumSpace:" ",Mellintrf:"ℳ",Mfr:"𝔐",mfr:"𝔪",mho:"℧",micro:"µ",midast:"*",midcir:"⫰",mid:"∣",middot:"·",minusb:"⊟",minus:"−",minusd:"∸",minusdu:"⨪",MinusPlus:"∓",mlcp:"⫛",mldr:"…",mnplus:"∓",models:"⊧",Mopf:"𝕄",mopf:"𝕞",mp:"∓",mscr:"𝓂",Mscr:"ℳ",mstpos:"∾",Mu:"Μ",mu:"μ",multimap:"⊸",mumap:"⊸",nabla:"∇",Nacute:"Ń",nacute:"ń",nang:"∠⃒",nap:"≉",napE:"⩰̸",napid:"≋̸",napos:"ʼn",napprox:"≉",natural:"♮",naturals:"ℕ",natur:"♮",nbsp:" ",nbump:"≎̸",nbumpe:"≏̸",ncap:"⩃",Ncaron:"Ň",ncaron:"ň",Ncedil:"Ņ",ncedil:"ņ",ncong:"≇",ncongdot:"⩭̸",ncup:"⩂",Ncy:"Н",ncy:"н",ndash:"–",nearhk:"⤤",nearr:"↗",neArr:"⇗",nearrow:"↗",ne:"≠",nedot:"≐̸",NegativeMediumSpace:"​",NegativeThickSpace:"​",NegativeThinSpace:"​",NegativeVeryThinSpace:"​",nequiv:"≢",nesear:"⤨",nesim:"≂̸",NestedGreaterGreater:"≫",NestedLessLess:"≪",NewLine:"\n",nexist:"∄",nexists:"∄",Nfr:"𝔑",nfr:"𝔫",ngE:"≧̸",nge:"≱",ngeq:"≱",ngeqq:"≧̸",ngeqslant:"⩾̸",nges:"⩾̸",nGg:"⋙̸",ngsim:"≵",nGt:"≫⃒",ngt:"≯",ngtr:"≯",nGtv:"≫̸",nharr:"↮",nhArr:"⇎",nhpar:"⫲",ni:"∋",nis:"⋼",nisd:"⋺",niv:"∋",NJcy:"Њ",njcy:"њ",nlarr:"↚",nlArr:"⇍",nldr:"‥",nlE:"≦̸",nle:"≰",nleftarrow:"↚",nLeftarrow:"⇍",nleftrightarrow:"↮",nLeftrightarrow:"⇎",nleq:"≰",nleqq:"≦̸",nleqslant:"⩽̸",nles:"⩽̸",nless:"≮",nLl:"⋘̸",nlsim:"≴",nLt:"≪⃒",nlt:"≮",nltri:"⋪",nltrie:"⋬",nLtv:"≪̸",nmid:"∤",NoBreak:"⁠",NonBreakingSpace:" ",nopf:"𝕟",Nopf:"ℕ",Not:"⫬",not:"¬",NotCongruent:"≢",NotCupCap:"≭",NotDoubleVerticalBar:"∦",NotElement:"∉",NotEqual:"≠",NotEqualTilde:"≂̸",NotExists:"∄",NotGreater:"≯",NotGreaterEqual:"≱",NotGreaterFullEqual:"≧̸",NotGreaterGreater:"≫̸",NotGreaterLess:"≹",NotGreaterSlantEqual:"⩾̸",NotGreaterTilde:"≵",NotHumpDownHump:"≎̸",NotHumpEqual:"≏̸",notin:"∉",notindot:"⋵̸",notinE:"⋹̸",notinva:"∉",notinvb:"⋷",notinvc:"⋶",NotLeftTriangleBar:"⧏̸",NotLeftTriangle:"⋪",NotLeftTriangleEqual:"⋬",NotLess:"≮",NotLessEqual:"≰",NotLessGreater:"≸",NotLessLess:"≪̸",NotLessSlantEqual:"⩽̸",NotLessTilde:"≴",NotNestedGreaterGreater:"⪢̸",NotNestedLessLess:"⪡̸",notni:"∌",notniva:"∌",notnivb:"⋾",notnivc:"⋽",NotPrecedes:"⊀",NotPrecedesEqual:"⪯̸",NotPrecedesSlantEqual:"⋠",NotReverseElement:"∌",NotRightTriangleBar:"⧐̸",NotRightTriangle:"⋫",NotRightTriangleEqual:"⋭",NotSquareSubset:"⊏̸",NotSquareSubsetEqual:"⋢",NotSquareSuperset:"⊐̸",NotSquareSupersetEqual:"⋣",NotSubset:"⊂⃒",NotSubsetEqual:"⊈",NotSucceeds:"⊁",NotSucceedsEqual:"⪰̸",NotSucceedsSlantEqual:"⋡",NotSucceedsTilde:"≿̸",NotSuperset:"⊃⃒",NotSupersetEqual:"⊉",NotTilde:"≁",NotTildeEqual:"≄",NotTildeFullEqual:"≇",NotTildeTilde:"≉",NotVerticalBar:"∤",nparallel:"∦",npar:"∦",nparsl:"⫽⃥",npart:"∂̸",npolint:"⨔",npr:"⊀",nprcue:"⋠",nprec:"⊀",npreceq:"⪯̸",npre:"⪯̸",nrarrc:"⤳̸",nrarr:"↛",nrArr:"⇏",nrarrw:"↝̸",nrightarrow:"↛",nRightarrow:"⇏",nrtri:"⋫",nrtrie:"⋭",nsc:"⊁",nsccue:"⋡",nsce:"⪰̸",Nscr:"𝒩",nscr:"𝓃",nshortmid:"∤",nshortparallel:"∦",nsim:"≁",nsime:"≄",nsimeq:"≄",nsmid:"∤",nspar:"∦",nsqsube:"⋢",nsqsupe:"⋣",nsub:"⊄",nsubE:"⫅̸",nsube:"⊈",nsubset:"⊂⃒",nsubseteq:"⊈",nsubseteqq:"⫅̸",nsucc:"⊁",nsucceq:"⪰̸",nsup:"⊅",nsupE:"⫆̸",nsupe:"⊉",nsupset:"⊃⃒",nsupseteq:"⊉",nsupseteqq:"⫆̸",ntgl:"≹",Ntilde:"Ñ",ntilde:"ñ",ntlg:"≸",ntriangleleft:"⋪",ntrianglelefteq:"⋬",ntriangleright:"⋫",ntrianglerighteq:"⋭",Nu:"Ν",nu:"ν",num:"#",numero:"№",numsp:" ",nvap:"≍⃒",nvdash:"⊬",nvDash:"⊭",nVdash:"⊮",nVDash:"⊯",nvge:"≥⃒",nvgt:">⃒",nvHarr:"⤄",nvinfin:"⧞",nvlArr:"⤂",nvle:"≤⃒",nvlt:"<⃒",nvltrie:"⊴⃒",nvrArr:"⤃",nvrtrie:"⊵⃒",nvsim:"∼⃒",nwarhk:"⤣",nwarr:"↖",nwArr:"⇖",nwarrow:"↖",nwnear:"⤧",Oacute:"Ó",oacute:"ó",oast:"⊛",Ocirc:"Ô",ocirc:"ô",ocir:"⊚",Ocy:"О",ocy:"о",odash:"⊝",Odblac:"Ő",odblac:"ő",odiv:"⨸",odot:"⊙",odsold:"⦼",OElig:"Œ",oelig:"œ",ofcir:"⦿",Ofr:"𝔒",ofr:"𝔬",ogon:"˛",Ograve:"Ò",ograve:"ò",ogt:"⧁",ohbar:"⦵",ohm:"Ω",oint:"∮",olarr:"↺",olcir:"⦾",olcross:"⦻",oline:"‾",olt:"⧀",Omacr:"Ō",omacr:"ō",Omega:"Ω",omega:"ω",Omicron:"Ο",omicron:"ο",omid:"⦶",ominus:"⊖",Oopf:"𝕆",oopf:"𝕠",opar:"⦷",OpenCurlyDoubleQuote:"“",OpenCurlyQuote:"‘",operp:"⦹",oplus:"⊕",orarr:"↻",Or:"⩔",or:"∨",ord:"⩝",order:"ℴ",orderof:"ℴ",ordf:"ª",ordm:"º",origof:"⊶",oror:"⩖",orslope:"⩗",orv:"⩛",oS:"Ⓢ",Oscr:"𝒪",oscr:"ℴ",Oslash:"Ø",oslash:"ø",osol:"⊘",Otilde:"Õ",otilde:"õ",otimesas:"⨶",Otimes:"⨷",otimes:"⊗",Ouml:"Ö",ouml:"ö",ovbar:"⌽",OverBar:"‾",OverBrace:"⏞",OverBracket:"⎴",OverParenthesis:"⏜",para:"¶",parallel:"∥",par:"∥",parsim:"⫳",parsl:"⫽",part:"∂",PartialD:"∂",Pcy:"П",pcy:"п",percnt:"%",period:".",permil:"‰",perp:"⊥",pertenk:"‱",Pfr:"𝔓",pfr:"𝔭",Phi:"Φ",phi:"φ",phiv:"ϕ",phmmat:"ℳ",phone:"☎",Pi:"Π",pi:"π",pitchfork:"⋔",piv:"ϖ",planck:"ℏ",planckh:"ℎ",plankv:"ℏ",plusacir:"⨣",plusb:"⊞",pluscir:"⨢",plus:"+",plusdo:"∔",plusdu:"⨥",pluse:"⩲",PlusMinus:"±",plusmn:"±",plussim:"⨦",plustwo:"⨧",pm:"±",Poincareplane:"ℌ",pointint:"⨕",popf:"𝕡",Popf:"ℙ",pound:"£",prap:"⪷",Pr:"⪻",pr:"≺",prcue:"≼",precapprox:"⪷",prec:"≺",preccurlyeq:"≼",Precedes:"≺",PrecedesEqual:"⪯",PrecedesSlantEqual:"≼",PrecedesTilde:"≾",preceq:"⪯",precnapprox:"⪹",precneqq:"⪵",precnsim:"⋨",pre:"⪯",prE:"⪳",precsim:"≾",prime:"′",Prime:"″",primes:"ℙ",prnap:"⪹",prnE:"⪵",prnsim:"⋨",prod:"∏",Product:"∏",profalar:"⌮",profline:"⌒",profsurf:"⌓",prop:"∝",Proportional:"∝",Proportion:"∷",propto:"∝",prsim:"≾",prurel:"⊰",Pscr:"𝒫",pscr:"𝓅",Psi:"Ψ",psi:"ψ",puncsp:" ",Qfr:"𝔔",qfr:"𝔮",qint:"⨌",qopf:"𝕢",Qopf:"ℚ",qprime:"⁗",Qscr:"𝒬",qscr:"𝓆",quaternions:"ℍ",quatint:"⨖",quest:"?",questeq:"≟",quot:'"',QUOT:'"',rAarr:"⇛",race:"∽̱",Racute:"Ŕ",racute:"ŕ",radic:"√",raemptyv:"⦳",rang:"⟩",Rang:"⟫",rangd:"⦒",range:"⦥",rangle:"⟩",raquo:"»",rarrap:"⥵",rarrb:"⇥",rarrbfs:"⤠",rarrc:"⤳",rarr:"→",Rarr:"↠",rArr:"⇒",rarrfs:"⤞",rarrhk:"↪",rarrlp:"↬",rarrpl:"⥅",rarrsim:"⥴",Rarrtl:"⤖",rarrtl:"↣",rarrw:"↝",ratail:"⤚",rAtail:"⤜",ratio:"∶",rationals:"ℚ",rbarr:"⤍",rBarr:"⤏",RBarr:"⤐",rbbrk:"❳",rbrace:"}",rbrack:"]",rbrke:"⦌",rbrksld:"⦎",rbrkslu:"⦐",Rcaron:"Ř",rcaron:"ř",Rcedil:"Ŗ",rcedil:"ŗ",rceil:"⌉",rcub:"}",Rcy:"Р",rcy:"р",rdca:"⤷",rdldhar:"⥩",rdquo:"”",rdquor:"”",rdsh:"↳",real:"ℜ",realine:"ℛ",realpart:"ℜ",reals:"ℝ",Re:"ℜ",rect:"▭",reg:"®",REG:"®",ReverseElement:"∋",ReverseEquilibrium:"⇋",ReverseUpEquilibrium:"⥯",rfisht:"⥽",rfloor:"⌋",rfr:"𝔯",Rfr:"ℜ",rHar:"⥤",rhard:"⇁",rharu:"⇀",rharul:"⥬",Rho:"Ρ",rho:"ρ",rhov:"ϱ",RightAngleBracket:"⟩",RightArrowBar:"⇥",rightarrow:"→",RightArrow:"→",Rightarrow:"⇒",RightArrowLeftArrow:"⇄",rightarrowtail:"↣",RightCeiling:"⌉",RightDoubleBracket:"⟧",RightDownTeeVector:"⥝",RightDownVectorBar:"⥕",RightDownVector:"⇂",RightFloor:"⌋",rightharpoondown:"⇁",rightharpoonup:"⇀",rightleftarrows:"⇄",rightleftharpoons:"⇌",rightrightarrows:"⇉",rightsquigarrow:"↝",RightTeeArrow:"↦",RightTee:"⊢",RightTeeVector:"⥛",rightthreetimes:"⋌",RightTriangleBar:"⧐",RightTriangle:"⊳",RightTriangleEqual:"⊵",RightUpDownVector:"⥏",RightUpTeeVector:"⥜",RightUpVectorBar:"⥔",RightUpVector:"↾",RightVectorBar:"⥓",RightVector:"⇀",ring:"˚",risingdotseq:"≓",rlarr:"⇄",rlhar:"⇌",rlm:"‏",rmoustache:"⎱",rmoust:"⎱",rnmid:"⫮",roang:"⟭",roarr:"⇾",robrk:"⟧",ropar:"⦆",ropf:"𝕣",Ropf:"ℝ",roplus:"⨮",rotimes:"⨵",RoundImplies:"⥰",rpar:")",rpargt:"⦔",rppolint:"⨒",rrarr:"⇉",Rrightarrow:"⇛",rsaquo:"›",rscr:"𝓇",Rscr:"ℛ",rsh:"↱",Rsh:"↱",rsqb:"]",rsquo:"’",rsquor:"’",rthree:"⋌",rtimes:"⋊",rtri:"▹",rtrie:"⊵",rtrif:"▸",rtriltri:"⧎",RuleDelayed:"⧴",ruluhar:"⥨",rx:"℞",Sacute:"Ś",sacute:"ś",sbquo:"‚",scap:"⪸",Scaron:"Š",scaron:"š",Sc:"⪼",sc:"≻",sccue:"≽",sce:"⪰",scE:"⪴",Scedil:"Ş",scedil:"ş",Scirc:"Ŝ",scirc:"ŝ",scnap:"⪺",scnE:"⪶",scnsim:"⋩",scpolint:"⨓",scsim:"≿",Scy:"С",scy:"с",sdotb:"⊡",sdot:"⋅",sdote:"⩦",searhk:"⤥",searr:"↘",seArr:"⇘",searrow:"↘",sect:"§",semi:";",
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",yicy:"ї",Yopf:"𝕐",yopf:"𝕪",Yscr:"𝒴",yscr:"𝓎",YUcy:"Ю",yucy:"ю",yuml:"ÿ",Yuml:"Ÿ",Zacute:"Ź",zacute:"ź",Zcaron:"Ž",zcaron:"ž",Zcy:"З",zcy:"з",Zdot:"Ż",zdot:"ż",zeetrf:"ℨ",ZeroWidthSpace:"​",Zeta:"Ζ",zeta:"ζ",zfr:"𝔷",Zfr:"ℨ",ZHcy:"Ж",zhcy:"ж",zigrarr:"⇝",zopf:"𝕫",Zopf:"ℤ",Zscr:"𝒵",zscr:"𝓏",zwj:"‍",zwnj:"‌"}},function(t,e){t.exports={Aacute:"Á",aacute:"á",Acirc:"Â",acirc:"â",acute:"´",AElig:"Æ",aelig:"æ",Agrave:"À",agrave:"à",amp:"&",AMP:"&",Aring:"Å",aring:"å",Atilde:"Ã",atilde:"ã",Auml:"Ä",auml:"ä",brvbar:"¦",Ccedil:"Ç",ccedil:"ç",cedil:"¸",cent:"¢",copy:"©",COPY:"©",curren:"¤",deg:"°",divide:"÷",Eacute:"É",eacute:"é",Ecirc:"Ê",ecirc:"ê",Egrave:"È",egrave:"è",ETH:"Ð",eth:"ð",Euml:"Ë",euml:"ë",frac12:"½",frac14:"¼",frac34:"¾",gt:">",GT:">",Iacute:"Í",iacute:"í",Icirc:"Î",icirc:"î",iexcl:"¡",Igrave:"Ì",igrave:"ì",iquest:"¿",Iuml:"Ï",iuml:"ï",laquo:"«",lt:"<",LT:"<",macr:"¯",micro:"µ",middot:"·",nbsp:" ",not:"¬",Ntilde:"Ñ",ntilde:"ñ",Oacute:"Ó",oacute:"ó",Ocirc:"Ô",ocirc:"ô",Ograve:"Ò",ograve:"ò",ordf:"ª",ordm:"º",Oslash:"Ø",oslash:"ø",Otilde:"Õ",otilde:"õ",Ouml:"Ö",ouml:"ö",para:"¶",plusmn:"±",pound:"£",quot:'"',QUOT:'"',raquo:"»",reg:"®",REG:"®",sect:"§",shy:"­",sup1:"¹",sup2:"²",sup3:"³",szlig:"ß",THORN:"Þ",thorn:"þ",times:"×",Uacute:"Ú",uacute:"ú",Ucirc:"Û",ucirc:"û",Ugrave:"Ù",ugrave:"ù",uml:"¨",Uuml:"Ü",uuml:"ü",Yacute:"Ý",yacute:"ý",yen:"¥",yuml:"ÿ"}},function(t,e){t.exports={amp:"&",apos:"'",gt:">",lt:"<",quot:'"'}},function(t,e,r){function 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e=0;e<this.sprite.costumes.length;e++)if(this.sprite.costumes[e].name==t)return e;return-1},n.prototype.updateAllDrawableProperties=function(){this.renderer&&this.renderer.updateDrawableProperties(this.drawableID,{position:[this.x,this.y],direction:this.direction,scale:[this.size,this.size],visible:this.visible,skin:this.sprite.costumes[this.currentCostume].skin})},n.prototype.getName=function(){return this.sprite.name},n.prototype.isTouchingColor=function(t){return!!this.renderer&&this.renderer.isTouchingColor(this.drawableID,t)},n.prototype.colorIsTouchingColor=function(t,e){return!!this.renderer&&this.renderer.isTouchingColor(this.drawableID,t,e)},t.exports=n},function(t,e,r){function n(t){t||(t=new i(this)),this.id=o(),this.blocks=t}var i=r(34),o=r(88);n.prototype.getName=function(){return this.id},t.exports=n},function(t,e){var r="!#%()*+,-./:;=?@[]^_`{|}~ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",n=function(){for(var t=20,e=r.length,n=[],i=0;i<t;i++)n[i]=r.charAt(Math.random()*e);return n.join("")};t.exports=n},function(t,e){var r={"forward:":{opcode:"motion_movesteps",argMap:[{type:"input",inputOp:"math_number",inputName:"STEPS"}]},"turnRight:":{opcode:"motion_turnright",argMap:[{type:"input",inputOp:"math_number",inputName:"DEGREES"}]},"turnLeft:":{opcode:"motion_turnleft",argMap:[{type:"input",inputOp:"math_number",inputName:"DEGREES"}]},"heading:":{opcode:"motion_pointindirection",argMap:[{type:"input",inputOp:"math_angle",inputName:"DIRECTION"}]},"pointTowards:":{opcode:"motion_pointtowards",argMap:[{type:"input",inputOp:"motion_pointtowards_menu",inputName:"TOWARDS"}]},"gotoX:y:":{opcode:"motion_gotoxy",argMap:[{type:"input",inputOp:"math_number",inputName:"X"},{type:"input",inputOp:"math_number",inputName:"Y"}]},"gotoSpriteOrMouse:":{opcode:"motion_goto",argMap:[{type:"input",inputOp:"motion_goto_menu",inputName:"TO"}]},"glideSecs:toX:y:elapsed:from:":{opcode:"motion_glidesecstoxy",argMap:[{type:"input",inputOp:"math_number",inputName:"SECS"},{type:"input",inputOp:"math_number",inputName:"X"},{type:"input",inputOp:"math_number",inputName:"Y"}]},"changeXposBy:":{opcode:"motion_changexby",argMap:[{type:"input",inputOp:"math_number",inputName:"DX"}]},"xpos:":{opcode:"motion_setx",argMap:[{type:"input",inputOp:"math_number",inputName:"X"}]},"changeYposBy:":{opcode:"motion_changeyby",argMap:[{type:"input",inputOp:"math_number",inputName:"DY"}]},"ypos:":{opcode:"motion_sety",argMap:[{type:"input",inputOp:"math_number",inputName:"Y"}]},bounceOffEdge:{opcode:"motion_ifonedgebounce",argMap:[]},setRotationStyle:{opcode:"motion_setrotationstyle",argMap:[{type:"input",inputOp:"motion_setrotationstyle_menu",inputName:"STYLE"}]},xpos:{opcode:"motion_xposition",argMap:[]},ypos:{opcode:"motion_yposition",argMap:[]},heading:{opcode:"motion_direction",argMap:[]},"say:duration:elapsed:from:":{opcode:"looks_sayforsecs",argMap:[{type:"input",inputOp:"text",inputName:"MESSAGE"},{type:"input",inputOp:"math_number",inputName:"SECS"}]},"say:":{opcode:"looks_say",argMap:[{type:"input",inputOp:"text",inputName:"MESSAGE"}]},"think:duration:elapsed:from:":{opcode:"looks_thinkforsecs",argMap:[{type:"input",inputOp:"text",inputName:"MESSAGE"},{type:"input",inputOp:"math_number",inputName:"SECS"}]},"think:":{opcode:"looks_think",argMap:[{type:"input",inputOp:"text",inputName:"MESSAGE"}]},show:{opcode:"looks_show",argMap:[]},hide:{opcode:"looks_hide",argMap:[]},"lookLike:":{opcode:"looks_switchcostumeto",argMap:[{type:"input",inputOp:"looks_costume",inputName:"COSTUME"}]},nextCostume:{opcode:"looks_nextcostume",argMap:[]},startScene:{opcode:"looks_switchbackdropto",argMap:[{type:"input",inputOp:"looks_backdrops",inputName:"BACKDROP"}]},"changeGraphicEffect:by:":{opcode:"looks_changeeffectby",argMap:[{type:"input",inputOp:"looks_effectmenu",inputName:"EFFECT"},{type:"input",inputOp:"math_number",inputName:"CHANGE"}]},"setGraphicEffect:to:":{opcode:"looks_seteffectto",argMap:[{type:"input",inputOp:"looks_effectmenu",inputName:"EFFECT"},{type:"input",inputOp:"math_number",inputName:"VALUE"}]},filterReset:{opcode:"looks_cleargraphiceffects",argMap:[]},"changeSizeBy:":{opcode:"looks_changesizeby",argMap:[{type:"input",inputOp:"math_number",inputName:"CHANGE"}]},"setSizeTo:":{opcode:"looks_setsizeto",argMap:[{type:"input",inputOp:"math_number",inputName:"SIZE"}]},comeToFront:{opcode:"looks_gotofront",argMap:[]},"goBackByLayers:":{opcode:"looks_gobacklayers",argMap:[{type:"input",inputOp:"math_integer",inputName:"NUM"}]},costumeIndex:{opcode:"looks_costumeorder",argMap:[]},sceneName:{opcode:"looks_backdropname",argMap:[]},scale:{opcode:"looks_size",argMap:[]},startSceneAndWait:{opcode:"looks_switchbackdroptoandwait",argMap:[{type:"input",inputOp:"looks_backdrops",inputName:"BACKDROP"}]},nextScene:{opcode:"looks_nextbackdrop",argMap:[]},backgroundIndex:{opcode:"looks_backdroporder",argMap:[]},"playSound:":{opcode:"sound_play",argMap:[{type:"input",inputOp:"sound_sounds_option",inputName:"SOUND_MENU"}]},doPlaySoundAndWait:{opcode:"sound_playuntildone",argMap:[{type:"input",inputOp:"sound_sounds_option",inputName:"SOUND_MENU"}]},stopAllSounds:{opcode:"sound_stopallsounds",argMap:[]},playDrum:{opcode:"sound_playdrumforbeats",argMap:[{type:"input",inputOp:"math_number",inputName:"DRUMTYPE"},{type:"input",inputOp:"math_number",inputName:"BEATS"}]},"rest:elapsed:from:":{opcode:"sound_restforbeats",argMap:[{type:"input",inputOp:"math_number",inputName:"BEATS"}]},"noteOn:duration:elapsed:from:":{opcode:"sound_playnoteforbeats",argMap:[{type:"input",inputOp:"math_number",inputName:"NOTE"},{type:"input",inputOp:"math_number",inputName:"BEATS"}]},"instrument:":{opcode:"sound_setinstrumentto",argMap:[{type:"input",inputOp:"math_number",inputName:"INSTRUMENT"}]},"changeVolumeBy:":{opcode:"sound_changevolumeby",argMap:[{type:"input",inputOp:"math_number",inputName:"VOLUME"}]},"setVolumeTo:":{opcode:"sound_setvolumeto",argMap:[{type:"input",inputOp:"math_number",inputName:"VOLUME"}]},volume:{opcode:"sound_volume",argMap:[]},"changeTempoBy:":{opcode:"sound_changetempoby",argMap:[{type:"input",inputOp:"math_number",inputName:"TEMPO"}]},"setTempoTo:":{opcode:"sound_settempotobpm",argMap:[{type:"input",inputOp:"math_number",inputName:"TEMPO"}]},tempo:{opcode:"sound_tempo",argMap:[]},clearPenTrails:{opcode:"pen_clear",argMap:[]},stampCostume:{opcode:"pen_stamp",argMap:[]},putPenDown:{opcode:"pen_pendown",argMap:[]},putPenUp:{opcode:"pen_penup",argMap:[]},"penColor:":{opcode:"pen_setpencolortocolor",argMap:[{type:"input",inputOp:"colour_picker",inputName:"COLOR"}]},"changePenHueBy:":{opcode:"pen_changepencolorby",argMap:[{type:"input",inputOp:"math_number",inputName:"COLOR"}]},"setPenHueTo:":{opcode:"pen_setpencolortonum",argMap:[{type:"input",inputOp:"math_number",inputName:"COLOR"}]},"changePenShadeBy:":{opcode:"pen_changepenshadeby",argMap:[{type:"input",inputOp:"math_number",inputName:"SHADE"}]},"setPenShadeTo:":{opcode:"pen_changepenshadeby",argMap:[{type:"input",inputOp:"math_number",inputName:"SHADE"}]},"changePenSizeBy:":{opcode:"pen_changepensizeby",argMap:[{type:"input",inputOp:"math_number",inputName:"SIZE"}]},"penSize:":{opcode:"pen_setpensizeto",argMap:[{type:"input",inputOp:"math_number",inputName:"SIZE"}]},whenGreenFlag:{opcode:"event_whenflagclicked",argMap:[]},whenKeyPressed:{opcode:"event_whenkeypressed",argMap:[{type:"field",fieldName:"KEY_OPTION"}]},whenClicked:{opcode:"event_whenthisspriteclicked",argMap:[]},whenSceneStarts:{opcode:"event_whenbackdropswitchesto",argMap:[{type:"field",fieldName:"BACKDROP"}]},whenSensorGreaterThan:{opcode:"event_whengreaterthan",argMap:[{type:"field",fieldName:"WHENGREATERTHANMENU"},{type:"input",inputOp:"math_number",inputName:"VALUE"}]},whenIReceive:{opcode:"event_whenbroadcastreceived",argMap:[{type:"field",fieldName:"BROADCAST_OPTION"}]},"broadcast:":{opcode:"event_broadcast",argMap:[{type:"field",fieldName:"BROADCAST_OPTION"}]},doBroadcastAndWait:{opcode:"event_broadcastandwait",argMap:[{type:"field",fieldName:"BROADCAST_OPTION"}]},"wait:elapsed:from:":{opcode:"control_wait",argMap:[{type:"input",inputOp:"math_positive_number",inputName:"DURATION"}]},doRepeat:{opcode:"control_repeat",argMap:[{type:"input",inputOp:"math_whole_number",inputName:"TIMES"},{type:"input",inputName:"SUBSTACK"}]},doForever:{opcode:"control_forever",argMap:[{type:"input",inputName:"SUBSTACK"}]},doIf:{opcode:"control_if",argMap:[{type:"input",inputName:"CONDITION"},{type:"input",inputName:"SUBSTACK"}]},doIfElse:{opcode:"control_if_else",argMap:[{type:"input",inputName:"CONDITION"},{type:"input",inputName:"SUBSTACK"},{type:"input",inputName:"SUBSTACK2"}]},doWaitUntil:{opcode:"control_wait_until",argMap:[{type:"input",inputName:"CONDITION"}]},doUntil:{opcode:"control_repeat_until",argMap:[{type:"input",inputName:"CONDITION"},{type:"input",inputName:"SUBSTACK"}]},stopScripts:{opcode:"control_stop",argMap:[{type:"input",inputOp:"control_stop_menu",inputName:"STOP_OPTION"}]},whenCloned:{opcode:"control_start_as_clone",argMap:[]},createCloneOf:{opcode:"control_create_clone_of",argMap:[{type:"input",inputOp:"control_create_clone_of_menu",inputName:"CLONE_OPTION"}]},deleteClone:{opcode:"control_delete_this_clone",argMap:[]},"touching:":{opcode:"sensing_touchingobject",argMap:[{type:"input",inputOp:"sensing_touchingobjectmenu",inputName:"TOUCHINGOBJECTMENU"}]},"touchingColor:":{opcode:"sensing_touchingcolor",argMap:[{type:"input",inputOp:"colour_picker",inputName:"COLOR"}]},"color:sees:":{opcode:"sensing_coloristouchingcolor",argMap:[{type:"input",inputOp:"colour_picker",inputName:"COLOR"},{type:"input",inputOp:"colour_picker",inputName:"COLOR2"}]},"distanceTo:":{opcode:"sensing_distanceto",argMap:[{type:"input",inputOp:"sensing_distancetomenu",inputName:"DISTANCETOMENU"}]},doAsk:{opcode:"sensing_askandwait",argMap:[{type:"input",inputOp:"text",inputName:"QUESTION"}]},answer:{opcode:"sensing_answer",argMap:[]},"keyPressed:":{opcode:"sensing_keypressed",argMap:[{type:"input",inputOp:"sensing_keyoptions",inputName:"KEY_OPTION"}]},mousePressed:{opcode:"sensing_mousedown",argMap:[]},mouseX:{opcode:"sensing_mousex",argMap:[]},mouseY:{opcode:"sensing_mousey",argMap:[]},soundLevel:{opcode:"sensing_loudness",argMap:[]},senseVideoMotion:{opcode:"sensing_videoon",argMap:[{type:"input",inputOp:"sensing_videoonmenuone",inputName:"VIDEOONMENU1"},{type:"input",inputOp:"sensing_videoonmenutwo",inputName:"VIDEOONMENU2"}]},setVideoState:{opcode:"sensing_videotoggle",argMap:[{type:"input",inputOp:"sensing_videotogglemenu",inputName:"VIDEOTOGGLEMENU"}]},setVideoTransparency:{opcode:"sensing_setvideotransparency",argMap:[{type:"input",inputOp:"math_number",inputName:"TRANSPARENCY"}]},timer:{opcode:"sensing_timer",argMap:[]},timerReset:{opcode:"sensing_resettimer",argMap:[]},"getAttribute:of:":{opcode:"sensing_of",argMap:[{type:"input",inputOp:"sensing_ofattributemenu",inputName:"ATTRIBUTE"},{type:"input",inputOp:"sensing_ofobjectmenu",inputName:"OBJECT"}]},timeAndDate:{opcode:"sensing_current",argMap:[{type:"input",inputOp:"sensing_currentmenu",inputName:"CURRENTMENU"}]},timestamp:{opcode:"sensing_dayssince2000",argMap:[]},getUserName:{opcode:"sensing_username",argMap:[]},"+":{opcode:"operator_add",argMap:[{type:"input",inputOp:"math_number",inputName:"NUM1"},{type:"input",inputOp:"math_number",inputName:"NUM2"}]},"-":{opcode:"operator_subtract",argMap:[{type:"input",inputOp:"math_number",inputName:"NUM1"},{type:"input",inputOp:"math_number",inputName:"NUM2"}]},"*":{opcode:"operator_multiply",argMap:[{type:"input",inputOp:"math_number",inputName:"NUM1"},{type:"input",inputOp:"math_number",inputName:"NUM2"}]},"/":{opcode:"operator_divide",argMap:[{type:"input",inputOp:"math_number",inputName:"NUM1"},{type:"input",inputOp:"math_number",inputName:"NUM2"}]},"randomFrom:to:":{opcode:"operator_random",argMap:[{type:"input",inputOp:"math_number",inputName:"FROM"},{type:"input",inputOp:"math_number",inputName:"TO"}]},"<":{opcode:"operator_lt",argMap:[{type:"input",inputOp:"text",inputName:"OPERAND1"},{type:"input",inputOp:"text",inputName:"OPERAND2"}]},"=":{opcode:"operator_equals",argMap:[{type:"input",inputOp:"text",inputName:"OPERAND1"},{type:"input",inputOp:"text",inputName:"OPERAND2"}]},">":{opcode:"operator_gt",argMap:[{type:"input",inputOp:"text",inputName:"OPERAND1"},{type:"input",inputOp:"text",inputName:"OPERAND2"}]},"&":{opcode:"operator_and",argMap:[{type:"input",inputName:"OPERAND1"},{type:"input",inputName:"OPERAND2"}]},"|":{opcode:"operator_or",argMap:[{type:"input",inputName:"OPERAND1"},{type:"input",inputName:"OPERAND2"}]},not:{opcode:"operator_not",argMap:[{type:"input",inputName:"OPERAND"}]},"concatenate:with:":{opcode:"operator_join",argMap:[{type:"input",inputOp:"text",inputName:"STRING1"},{type:"input",inputOp:"text",inputName:"STRING2"}]},"letter:of:":{opcode:"operator_letter_of",argMap:[{type:"input",inputOp:"math_whole_number",inputName:"LETTER"},{type:"input",inputOp:"text",inputName:"STRING"}]},"stringLength:":{opcode:"operator_length",argMap:[{type:"input",inputOp:"text",inputName:"STRING"}]},"%":{opcode:"operator_mod",argMap:[{type:"input",inputOp:"math_number",inputName:"NUM1"},{type:"input",inputOp:"math_number",inputName:"NUM2"}]},rounded:{opcode:"operator_round",argMap:[{type:"input",inputOp:"math_number",inputName:"NUM"}]},"computeFunction:of:":{opcode:"operator_mathop",argMap:[{type:"input",inputOp:"operator_mathop_menu",inputName:"OPERATOR"},{type:"input",inputOp:"math_number",inputName:"NUM"}]},readVariable:{opcode:"data_variable",argMap:[{type:"input",inputOp:"data_variablemenu",inputName:"VARIABLE"}]},"setVar:to:":{opcode:"data_setvariableto",argMap:[{type:"input",inputOp:"data_variablemenu",inputName:"VARIABLE"},{type:"input",inputOp:"text",inputName:"VALUE"}]},"changeVar:by:":{opcode:"data_changevariableby",argMap:[{type:"input",inputOp:"data_variablemenu",inputName:"VARIABLE"},{type:"input",inputOp:"math_number",inputName:"VALUE"}]},"showVariable:":{opcode:"data_showvariable",argMap:[{type:"input",inputOp:"data_variablemenu",inputName:"VARIABLE"}]},"hideVariable:":{opcode:"data_hidevariable",argMap:[{type:"input",inputOp:"data_variablemenu",inputName:"VARIABLE"}]},"append:toList:":{opcode:"data_listadd",argMap:[{type:"input",inputOp:"text",inputName:"VALUE"},{type:"field",fieldName:"LIST"}]},"deleteLine:ofList:":{opcode:"data_listdelete",argMap:[{type:"input",inputOp:"text",inputName:"LINE"},{type:"field",fieldName:"LIST"}]},"insert:at:ofList:":{opcode:"data_listinsert",argMap:[{type:"input",inputOp:"text",inputName:"VALUE"},{type:"input",inputOp:"text",inputName:"LINE"},{type:"field",fieldName:"LIST"}]},"setLine:ofList:to:":{opcode:"data_listreplace",argMap:[{type:"input",inputOp:"text",inputName:"LINE"},{type:"field",fieldName:"LIST"},{type:"input",inputOp:"text",inputName:"VALUE"}]},"getLine:ofList:":{opcode:"data_listitem",argMap:[{type:"input",inputOp:"text",inputName:"LINE"},{type:"field",fieldName:"LIST"}]},"lineCountOfList:":{opcode:"data_listlength",argMap:[{type:"field",fieldName:"LIST"}]},"list:contains:":{opcode:"data_listcontains",argMap:[{type:"field",fieldName:"LIST"},{type:"input",inputOp:"text",inputName:"VALUE"}]},"showList:":{opcode:"data_showlist",argMap:[{type:"field",fieldName:"LIST"}]},"hideList:":{opcode:"data_hidelist",argMap:[{type:"field",fieldName:"LIST"}]},procDef:{opcode:"proc_def",argMap:[]},getParam:{opcode:"proc_param",argMap:[]},call:{opcode:"proc_call",argMap:[]}};t.exports=r}]);
\ No newline at end of file
diff --git a/vm.worker.js b/vm.worker.js
deleted file mode 100644
index efdd8771..00000000
--- a/vm.worker.js
+++ /dev/null
@@ -1,1169 +0,0 @@
-/******/ (function(modules) { // webpackBootstrap
-/******/ 	// The module cache
-/******/ 	var installedModules = {};
-
-/******/ 	// The require function
-/******/ 	function __webpack_require__(moduleId) {
-
-/******/ 		// Check if module is in cache
-/******/ 		if(installedModules[moduleId])
-/******/ 			return installedModules[moduleId].exports;
-
-/******/ 		// Create a new module (and put it into the cache)
-/******/ 		var module = installedModules[moduleId] = {
-/******/ 			exports: {},
-/******/ 			id: moduleId,
-/******/ 			loaded: false
-/******/ 		};
-
-/******/ 		// Execute the module function
-/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
-
-/******/ 		// Flag the module as loaded
-/******/ 		module.loaded = true;
-
-/******/ 		// Return the exports of the module
-/******/ 		return module.exports;
-/******/ 	}
-
-
-/******/ 	// expose the modules object (__webpack_modules__)
-/******/ 	__webpack_require__.m = modules;
-
-/******/ 	// expose the module cache
-/******/ 	__webpack_require__.c = installedModules;
-
-/******/ 	// __webpack_public_path__
-/******/ 	__webpack_require__.p = "";
-
-/******/ 	// Load entry module and return exports
-/******/ 	return __webpack_require__(0);
-/******/ })
-/************************************************************************/
-/******/ ([
-/* 0 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var EventEmitter = __webpack_require__(1);
-	var util = __webpack_require__(2);
-
-	function VirtualMachine () {
-	    if (!window.Worker) {
-	        console.error('WebWorkers not supported in this environment.' +
-	            ' Please use the non-worker version (vm.js or vm.min.js).');
-	        return;
-	    }
-	    var instance = this;
-	    EventEmitter.call(instance);
-	    instance.vmWorker = new Worker('../vm.js');
-
-	    // onmessage calls are converted into emitted events.
-	    instance.vmWorker.onmessage = function (e) {
-	        instance.emit(e.data.method, e.data);
-	    };
-
-	    instance.blockListener = function (e) {
-	        // Messages from Blockly are not serializable by default.
-	        // Pull out the necessary, serializable components to pass across.
-	        var serializableE = {
-	            blockId: e.blockId,
-	            element: e.element,
-	            type: e.type,
-	            name: e.name,
-	            newValue: e.newValue,
-	            oldParentId: e.oldParentId,
-	            oldInputName: e.oldInputName,
-	            newParentId: e.newParentId,
-	            newInputName: e.newInputName,
-	            xml: {
-	                outerHTML: (e.xml) ? e.xml.outerHTML : null
-	            }
-	        };
-	        instance.vmWorker.postMessage({
-	            method: 'blockListener',
-	            args: serializableE
-	        });
-	    };
-	}
-
-	/**
-	 * Inherit from EventEmitter
-	 */
-	util.inherits(VirtualMachine, EventEmitter);
-
-	// For documentation, please see index.js.
-	// These mirror the functionality provided there, with the worker wrapper.
-	VirtualMachine.prototype.getPlaygroundData = function () {
-	    this.vmWorker.postMessage({method: 'getPlaygroundData'});
-	};
-
-	VirtualMachine.prototype.postIOData = function (device, data) {
-	    this.vmWorker.postMessage({
-	        method: 'postIOData',
-	        device: device,
-	        data: data
-	    });
-	};
-
-	VirtualMachine.prototype.start = function () {
-	    this.vmWorker.postMessage({method: 'start'});
-	};
-
-	VirtualMachine.prototype.greenFlag = function () {
-	    this.vmWorker.postMessage({method: 'greenFlag'});
-	};
-
-	VirtualMachine.prototype.stopAll = function () {
-	    this.vmWorker.postMessage({method: 'stopAll'});
-	};
-
-	VirtualMachine.prototype.animationFrame = function () {
-	    this.vmWorker.postMessage({method: 'animationFrame'});
-	};
-
-	/**
-	 * Export and bind to `window`
-	 */
-	module.exports = VirtualMachine;
-	if (typeof window !== 'undefined') window.VirtualMachine = module.exports;
-
-
-/***/ },
-/* 1 */
-/***/ function(module, exports) {
-
-	// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	function EventEmitter() {
-	  this._events = this._events || {};
-	  this._maxListeners = this._maxListeners || undefined;
-	}
-	module.exports = EventEmitter;
-
-	// Backwards-compat with node 0.10.x
-	EventEmitter.EventEmitter = EventEmitter;
-
-	EventEmitter.prototype._events = undefined;
-	EventEmitter.prototype._maxListeners = undefined;
-
-	// By default EventEmitters will print a warning if more than 10 listeners are
-	// added to it. This is a useful default which helps finding memory leaks.
-	EventEmitter.defaultMaxListeners = 10;
-
-	// Obviously not all Emitters should be limited to 10. This function allows
-	// that to be increased. Set to zero for unlimited.
-	EventEmitter.prototype.setMaxListeners = function(n) {
-	  if (!isNumber(n) || n < 0 || isNaN(n))
-	    throw TypeError('n must be a positive number');
-	  this._maxListeners = n;
-	  return this;
-	};
-
-	EventEmitter.prototype.emit = function(type) {
-	  var er, handler, len, args, i, listeners;
-
-	  if (!this._events)
-	    this._events = {};
-
-	  // If there is no 'error' event listener then throw.
-	  if (type === 'error') {
-	    if (!this._events.error ||
-	        (isObject(this._events.error) && !this._events.error.length)) {
-	      er = arguments[1];
-	      if (er instanceof Error) {
-	        throw er; // Unhandled 'error' event
-	      }
-	      throw TypeError('Uncaught, unspecified "error" event.');
-	    }
-	  }
-
-	  handler = this._events[type];
-
-	  if (isUndefined(handler))
-	    return false;
-
-	  if (isFunction(handler)) {
-	    switch (arguments.length) {
-	      // fast cases
-	      case 1:
-	        handler.call(this);
-	        break;
-	      case 2:
-	        handler.call(this, arguments[1]);
-	        break;
-	      case 3:
-	        handler.call(this, arguments[1], arguments[2]);
-	        break;
-	      // slower
-	      default:
-	        args = Array.prototype.slice.call(arguments, 1);
-	        handler.apply(this, args);
-	    }
-	  } else if (isObject(handler)) {
-	    args = Array.prototype.slice.call(arguments, 1);
-	    listeners = handler.slice();
-	    len = listeners.length;
-	    for (i = 0; i < len; i++)
-	      listeners[i].apply(this, args);
-	  }
-
-	  return true;
-	};
-
-	EventEmitter.prototype.addListener = function(type, listener) {
-	  var m;
-
-	  if (!isFunction(listener))
-	    throw TypeError('listener must be a function');
-
-	  if (!this._events)
-	    this._events = {};
-
-	  // To avoid recursion in the case that type === "newListener"! Before
-	  // adding it to the listeners, first emit "newListener".
-	  if (this._events.newListener)
-	    this.emit('newListener', type,
-	              isFunction(listener.listener) ?
-	              listener.listener : listener);
-
-	  if (!this._events[type])
-	    // Optimize the case of one listener. Don't need the extra array object.
-	    this._events[type] = listener;
-	  else if (isObject(this._events[type]))
-	    // If we've already got an array, just append.
-	    this._events[type].push(listener);
-	  else
-	    // Adding the second element, need to change to array.
-	    this._events[type] = [this._events[type], listener];
-
-	  // Check for listener leak
-	  if (isObject(this._events[type]) && !this._events[type].warned) {
-	    if (!isUndefined(this._maxListeners)) {
-	      m = this._maxListeners;
-	    } else {
-	      m = EventEmitter.defaultMaxListeners;
-	    }
-
-	    if (m && m > 0 && this._events[type].length > m) {
-	      this._events[type].warned = true;
-	      console.error('(node) warning: possible EventEmitter memory ' +
-	                    'leak detected. %d listeners added. ' +
-	                    'Use emitter.setMaxListeners() to increase limit.',
-	                    this._events[type].length);
-	      if (typeof console.trace === 'function') {
-	        // not supported in IE 10
-	        console.trace();
-	      }
-	    }
-	  }
-
-	  return this;
-	};
-
-	EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-
-	EventEmitter.prototype.once = function(type, listener) {
-	  if (!isFunction(listener))
-	    throw TypeError('listener must be a function');
-
-	  var fired = false;
-
-	  function g() {
-	    this.removeListener(type, g);
-
-	    if (!fired) {
-	      fired = true;
-	      listener.apply(this, arguments);
-	    }
-	  }
-
-	  g.listener = listener;
-	  this.on(type, g);
-
-	  return this;
-	};
-
-	// emits a 'removeListener' event iff the listener was removed
-	EventEmitter.prototype.removeListener = function(type, listener) {
-	  var list, position, length, i;
-
-	  if (!isFunction(listener))
-	    throw TypeError('listener must be a function');
-
-	  if (!this._events || !this._events[type])
-	    return this;
-
-	  list = this._events[type];
-	  length = list.length;
-	  position = -1;
-
-	  if (list === listener ||
-	      (isFunction(list.listener) && list.listener === listener)) {
-	    delete this._events[type];
-	    if (this._events.removeListener)
-	      this.emit('removeListener', type, listener);
-
-	  } else if (isObject(list)) {
-	    for (i = length; i-- > 0;) {
-	      if (list[i] === listener ||
-	          (list[i].listener && list[i].listener === listener)) {
-	        position = i;
-	        break;
-	      }
-	    }
-
-	    if (position < 0)
-	      return this;
-
-	    if (list.length === 1) {
-	      list.length = 0;
-	      delete this._events[type];
-	    } else {
-	      list.splice(position, 1);
-	    }
-
-	    if (this._events.removeListener)
-	      this.emit('removeListener', type, listener);
-	  }
-
-	  return this;
-	};
-
-	EventEmitter.prototype.removeAllListeners = function(type) {
-	  var key, listeners;
-
-	  if (!this._events)
-	    return this;
-
-	  // not listening for removeListener, no need to emit
-	  if (!this._events.removeListener) {
-	    if (arguments.length === 0)
-	      this._events = {};
-	    else if (this._events[type])
-	      delete this._events[type];
-	    return this;
-	  }
-
-	  // emit removeListener for all listeners on all events
-	  if (arguments.length === 0) {
-	    for (key in this._events) {
-	      if (key === 'removeListener') continue;
-	      this.removeAllListeners(key);
-	    }
-	    this.removeAllListeners('removeListener');
-	    this._events = {};
-	    return this;
-	  }
-
-	  listeners = this._events[type];
-
-	  if (isFunction(listeners)) {
-	    this.removeListener(type, listeners);
-	  } else if (listeners) {
-	    // LIFO order
-	    while (listeners.length)
-	      this.removeListener(type, listeners[listeners.length - 1]);
-	  }
-	  delete this._events[type];
-
-	  return this;
-	};
-
-	EventEmitter.prototype.listeners = function(type) {
-	  var ret;
-	  if (!this._events || !this._events[type])
-	    ret = [];
-	  else if (isFunction(this._events[type]))
-	    ret = [this._events[type]];
-	  else
-	    ret = this._events[type].slice();
-	  return ret;
-	};
-
-	EventEmitter.prototype.listenerCount = function(type) {
-	  if (this._events) {
-	    var evlistener = this._events[type];
-
-	    if (isFunction(evlistener))
-	      return 1;
-	    else if (evlistener)
-	      return evlistener.length;
-	  }
-	  return 0;
-	};
-
-	EventEmitter.listenerCount = function(emitter, type) {
-	  return emitter.listenerCount(type);
-	};
-
-	function isFunction(arg) {
-	  return typeof arg === 'function';
-	}
-
-	function isNumber(arg) {
-	  return typeof arg === 'number';
-	}
-
-	function isObject(arg) {
-	  return typeof arg === 'object' && arg !== null;
-	}
-
-	function isUndefined(arg) {
-	  return arg === void 0;
-	}
-
-
-/***/ },
-/* 2 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(global, process) {// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	var formatRegExp = /%[sdj%]/g;
-	exports.format = function(f) {
-	  if (!isString(f)) {
-	    var objects = [];
-	    for (var i = 0; i < arguments.length; i++) {
-	      objects.push(inspect(arguments[i]));
-	    }
-	    return objects.join(' ');
-	  }
-
-	  var i = 1;
-	  var args = arguments;
-	  var len = args.length;
-	  var str = String(f).replace(formatRegExp, function(x) {
-	    if (x === '%%') return '%';
-	    if (i >= len) return x;
-	    switch (x) {
-	      case '%s': return String(args[i++]);
-	      case '%d': return Number(args[i++]);
-	      case '%j':
-	        try {
-	          return JSON.stringify(args[i++]);
-	        } catch (_) {
-	          return '[Circular]';
-	        }
-	      default:
-	        return x;
-	    }
-	  });
-	  for (var x = args[i]; i < len; x = args[++i]) {
-	    if (isNull(x) || !isObject(x)) {
-	      str += ' ' + x;
-	    } else {
-	      str += ' ' + inspect(x);
-	    }
-	  }
-	  return str;
-	};
-
-
-	// Mark that a method should not be used.
-	// Returns a modified function which warns once by default.
-	// If --no-deprecation is set, then it is a no-op.
-	exports.deprecate = function(fn, msg) {
-	  // Allow for deprecating things in the process of starting up.
-	  if (isUndefined(global.process)) {
-	    return function() {
-	      return exports.deprecate(fn, msg).apply(this, arguments);
-	    };
-	  }
-
-	  if (process.noDeprecation === true) {
-	    return fn;
-	  }
-
-	  var warned = false;
-	  function deprecated() {
-	    if (!warned) {
-	      if (process.throwDeprecation) {
-	        throw new Error(msg);
-	      } else if (process.traceDeprecation) {
-	        console.trace(msg);
-	      } else {
-	        console.error(msg);
-	      }
-	      warned = true;
-	    }
-	    return fn.apply(this, arguments);
-	  }
-
-	  return deprecated;
-	};
-
-
-	var debugs = {};
-	var debugEnviron;
-	exports.debuglog = function(set) {
-	  if (isUndefined(debugEnviron))
-	    debugEnviron = process.env.NODE_DEBUG || '';
-	  set = set.toUpperCase();
-	  if (!debugs[set]) {
-	    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
-	      var pid = process.pid;
-	      debugs[set] = function() {
-	        var msg = exports.format.apply(exports, arguments);
-	        console.error('%s %d: %s', set, pid, msg);
-	      };
-	    } else {
-	      debugs[set] = function() {};
-	    }
-	  }
-	  return debugs[set];
-	};
-
-
-	/**
-	 * Echos the value of a value. Trys to print the value out
-	 * in the best way possible given the different types.
-	 *
-	 * @param {Object} obj The object to print out.
-	 * @param {Object} opts Optional options object that alters the output.
-	 */
-	/* legacy: obj, showHidden, depth, colors*/
-	function inspect(obj, opts) {
-	  // default options
-	  var ctx = {
-	    seen: [],
-	    stylize: stylizeNoColor
-	  };
-	  // legacy...
-	  if (arguments.length >= 3) ctx.depth = arguments[2];
-	  if (arguments.length >= 4) ctx.colors = arguments[3];
-	  if (isBoolean(opts)) {
-	    // legacy...
-	    ctx.showHidden = opts;
-	  } else if (opts) {
-	    // got an "options" object
-	    exports._extend(ctx, opts);
-	  }
-	  // set default options
-	  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
-	  if (isUndefined(ctx.depth)) ctx.depth = 2;
-	  if (isUndefined(ctx.colors)) ctx.colors = false;
-	  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
-	  if (ctx.colors) ctx.stylize = stylizeWithColor;
-	  return formatValue(ctx, obj, ctx.depth);
-	}
-	exports.inspect = inspect;
-
-
-	// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
-	inspect.colors = {
-	  'bold' : [1, 22],
-	  'italic' : [3, 23],
-	  'underline' : [4, 24],
-	  'inverse' : [7, 27],
-	  'white' : [37, 39],
-	  'grey' : [90, 39],
-	  'black' : [30, 39],
-	  'blue' : [34, 39],
-	  'cyan' : [36, 39],
-	  'green' : [32, 39],
-	  'magenta' : [35, 39],
-	  'red' : [31, 39],
-	  'yellow' : [33, 39]
-	};
-
-	// Don't use 'blue' not visible on cmd.exe
-	inspect.styles = {
-	  'special': 'cyan',
-	  'number': 'yellow',
-	  'boolean': 'yellow',
-	  'undefined': 'grey',
-	  'null': 'bold',
-	  'string': 'green',
-	  'date': 'magenta',
-	  // "name": intentionally not styling
-	  'regexp': 'red'
-	};
-
-
-	function stylizeWithColor(str, styleType) {
-	  var style = inspect.styles[styleType];
-
-	  if (style) {
-	    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
-	           '\u001b[' + inspect.colors[style][1] + 'm';
-	  } else {
-	    return str;
-	  }
-	}
-
-
-	function stylizeNoColor(str, styleType) {
-	  return str;
-	}
-
-
-	function arrayToHash(array) {
-	  var hash = {};
-
-	  array.forEach(function(val, idx) {
-	    hash[val] = true;
-	  });
-
-	  return hash;
-	}
-
-
-	function formatValue(ctx, value, recurseTimes) {
-	  // Provide a hook for user-specified inspect functions.
-	  // Check that value is an object with an inspect function on it
-	  if (ctx.customInspect &&
-	      value &&
-	      isFunction(value.inspect) &&
-	      // Filter out the util module, it's inspect function is special
-	      value.inspect !== exports.inspect &&
-	      // Also filter out any prototype objects using the circular check.
-	      !(value.constructor && value.constructor.prototype === value)) {
-	    var ret = value.inspect(recurseTimes, ctx);
-	    if (!isString(ret)) {
-	      ret = formatValue(ctx, ret, recurseTimes);
-	    }
-	    return ret;
-	  }
-
-	  // Primitive types cannot have properties
-	  var primitive = formatPrimitive(ctx, value);
-	  if (primitive) {
-	    return primitive;
-	  }
-
-	  // Look up the keys of the object.
-	  var keys = Object.keys(value);
-	  var visibleKeys = arrayToHash(keys);
-
-	  if (ctx.showHidden) {
-	    keys = Object.getOwnPropertyNames(value);
-	  }
-
-	  // IE doesn't make error fields non-enumerable
-	  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
-	  if (isError(value)
-	      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
-	    return formatError(value);
-	  }
-
-	  // Some type of object without properties can be shortcutted.
-	  if (keys.length === 0) {
-	    if (isFunction(value)) {
-	      var name = value.name ? ': ' + value.name : '';
-	      return ctx.stylize('[Function' + name + ']', 'special');
-	    }
-	    if (isRegExp(value)) {
-	      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-	    }
-	    if (isDate(value)) {
-	      return ctx.stylize(Date.prototype.toString.call(value), 'date');
-	    }
-	    if (isError(value)) {
-	      return formatError(value);
-	    }
-	  }
-
-	  var base = '', array = false, braces = ['{', '}'];
-
-	  // Make Array say that they are Array
-	  if (isArray(value)) {
-	    array = true;
-	    braces = ['[', ']'];
-	  }
-
-	  // Make functions say that they are functions
-	  if (isFunction(value)) {
-	    var n = value.name ? ': ' + value.name : '';
-	    base = ' [Function' + n + ']';
-	  }
-
-	  // Make RegExps say that they are RegExps
-	  if (isRegExp(value)) {
-	    base = ' ' + RegExp.prototype.toString.call(value);
-	  }
-
-	  // Make dates with properties first say the date
-	  if (isDate(value)) {
-	    base = ' ' + Date.prototype.toUTCString.call(value);
-	  }
-
-	  // Make error with message first say the error
-	  if (isError(value)) {
-	    base = ' ' + formatError(value);
-	  }
-
-	  if (keys.length === 0 && (!array || value.length == 0)) {
-	    return braces[0] + base + braces[1];
-	  }
-
-	  if (recurseTimes < 0) {
-	    if (isRegExp(value)) {
-	      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-	    } else {
-	      return ctx.stylize('[Object]', 'special');
-	    }
-	  }
-
-	  ctx.seen.push(value);
-
-	  var output;
-	  if (array) {
-	    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
-	  } else {
-	    output = keys.map(function(key) {
-	      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
-	    });
-	  }
-
-	  ctx.seen.pop();
-
-	  return reduceToSingleString(output, base, braces);
-	}
-
-
-	function formatPrimitive(ctx, value) {
-	  if (isUndefined(value))
-	    return ctx.stylize('undefined', 'undefined');
-	  if (isString(value)) {
-	    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
-	                                             .replace(/'/g, "\\'")
-	                                             .replace(/\\"/g, '"') + '\'';
-	    return ctx.stylize(simple, 'string');
-	  }
-	  if (isNumber(value))
-	    return ctx.stylize('' + value, 'number');
-	  if (isBoolean(value))
-	    return ctx.stylize('' + value, 'boolean');
-	  // For some reason typeof null is "object", so special case here.
-	  if (isNull(value))
-	    return ctx.stylize('null', 'null');
-	}
-
-
-	function formatError(value) {
-	  return '[' + Error.prototype.toString.call(value) + ']';
-	}
-
-
-	function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
-	  var output = [];
-	  for (var i = 0, l = value.length; i < l; ++i) {
-	    if (hasOwnProperty(value, String(i))) {
-	      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-	          String(i), true));
-	    } else {
-	      output.push('');
-	    }
-	  }
-	  keys.forEach(function(key) {
-	    if (!key.match(/^\d+$/)) {
-	      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-	          key, true));
-	    }
-	  });
-	  return output;
-	}
-
-
-	function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
-	  var name, str, desc;
-	  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
-	  if (desc.get) {
-	    if (desc.set) {
-	      str = ctx.stylize('[Getter/Setter]', 'special');
-	    } else {
-	      str = ctx.stylize('[Getter]', 'special');
-	    }
-	  } else {
-	    if (desc.set) {
-	      str = ctx.stylize('[Setter]', 'special');
-	    }
-	  }
-	  if (!hasOwnProperty(visibleKeys, key)) {
-	    name = '[' + key + ']';
-	  }
-	  if (!str) {
-	    if (ctx.seen.indexOf(desc.value) < 0) {
-	      if (isNull(recurseTimes)) {
-	        str = formatValue(ctx, desc.value, null);
-	      } else {
-	        str = formatValue(ctx, desc.value, recurseTimes - 1);
-	      }
-	      if (str.indexOf('\n') > -1) {
-	        if (array) {
-	          str = str.split('\n').map(function(line) {
-	            return '  ' + line;
-	          }).join('\n').substr(2);
-	        } else {
-	          str = '\n' + str.split('\n').map(function(line) {
-	            return '   ' + line;
-	          }).join('\n');
-	        }
-	      }
-	    } else {
-	      str = ctx.stylize('[Circular]', 'special');
-	    }
-	  }
-	  if (isUndefined(name)) {
-	    if (array && key.match(/^\d+$/)) {
-	      return str;
-	    }
-	    name = JSON.stringify('' + key);
-	    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
-	      name = name.substr(1, name.length - 2);
-	      name = ctx.stylize(name, 'name');
-	    } else {
-	      name = name.replace(/'/g, "\\'")
-	                 .replace(/\\"/g, '"')
-	                 .replace(/(^"|"$)/g, "'");
-	      name = ctx.stylize(name, 'string');
-	    }
-	  }
-
-	  return name + ': ' + str;
-	}
-
-
-	function reduceToSingleString(output, base, braces) {
-	  var numLinesEst = 0;
-	  var length = output.reduce(function(prev, cur) {
-	    numLinesEst++;
-	    if (cur.indexOf('\n') >= 0) numLinesEst++;
-	    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
-	  }, 0);
-
-	  if (length > 60) {
-	    return braces[0] +
-	           (base === '' ? '' : base + '\n ') +
-	           ' ' +
-	           output.join(',\n  ') +
-	           ' ' +
-	           braces[1];
-	  }
-
-	  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
-	}
-
-
-	// NOTE: These type checking functions intentionally don't use `instanceof`
-	// because it is fragile and can be easily faked with `Object.create()`.
-	function isArray(ar) {
-	  return Array.isArray(ar);
-	}
-	exports.isArray = isArray;
-
-	function isBoolean(arg) {
-	  return typeof arg === 'boolean';
-	}
-	exports.isBoolean = isBoolean;
-
-	function isNull(arg) {
-	  return arg === null;
-	}
-	exports.isNull = isNull;
-
-	function isNullOrUndefined(arg) {
-	  return arg == null;
-	}
-	exports.isNullOrUndefined = isNullOrUndefined;
-
-	function isNumber(arg) {
-	  return typeof arg === 'number';
-	}
-	exports.isNumber = isNumber;
-
-	function isString(arg) {
-	  return typeof arg === 'string';
-	}
-	exports.isString = isString;
-
-	function isSymbol(arg) {
-	  return typeof arg === 'symbol';
-	}
-	exports.isSymbol = isSymbol;
-
-	function isUndefined(arg) {
-	  return arg === void 0;
-	}
-	exports.isUndefined = isUndefined;
-
-	function isRegExp(re) {
-	  return isObject(re) && objectToString(re) === '[object RegExp]';
-	}
-	exports.isRegExp = isRegExp;
-
-	function isObject(arg) {
-	  return typeof arg === 'object' && arg !== null;
-	}
-	exports.isObject = isObject;
-
-	function isDate(d) {
-	  return isObject(d) && objectToString(d) === '[object Date]';
-	}
-	exports.isDate = isDate;
-
-	function isError(e) {
-	  return isObject(e) &&
-	      (objectToString(e) === '[object Error]' || e instanceof Error);
-	}
-	exports.isError = isError;
-
-	function isFunction(arg) {
-	  return typeof arg === 'function';
-	}
-	exports.isFunction = isFunction;
-
-	function isPrimitive(arg) {
-	  return arg === null ||
-	         typeof arg === 'boolean' ||
-	         typeof arg === 'number' ||
-	         typeof arg === 'string' ||
-	         typeof arg === 'symbol' ||  // ES6 symbol
-	         typeof arg === 'undefined';
-	}
-	exports.isPrimitive = isPrimitive;
-
-	exports.isBuffer = __webpack_require__(4);
-
-	function objectToString(o) {
-	  return Object.prototype.toString.call(o);
-	}
-
-
-	function pad(n) {
-	  return n < 10 ? '0' + n.toString(10) : n.toString(10);
-	}
-
-
-	var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
-	              'Oct', 'Nov', 'Dec'];
-
-	// 26 Feb 16:19:34
-	function timestamp() {
-	  var d = new Date();
-	  var time = [pad(d.getHours()),
-	              pad(d.getMinutes()),
-	              pad(d.getSeconds())].join(':');
-	  return [d.getDate(), months[d.getMonth()], time].join(' ');
-	}
-
-
-	// log is just a thin wrapper to console.log that prepends a timestamp
-	exports.log = function() {
-	  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
-	};
-
-
-	/**
-	 * Inherit the prototype methods from one constructor into another.
-	 *
-	 * The Function.prototype.inherits from lang.js rewritten as a standalone
-	 * function (not on Function.prototype). NOTE: If this file is to be loaded
-	 * during bootstrapping this function needs to be rewritten using some native
-	 * functions as prototype setup using normal JavaScript does not work as
-	 * expected during bootstrapping (see mirror.js in r114903).
-	 *
-	 * @param {function} ctor Constructor function which needs to inherit the
-	 *     prototype.
-	 * @param {function} superCtor Constructor function to inherit prototype from.
-	 */
-	exports.inherits = __webpack_require__(5);
-
-	exports._extend = function(origin, add) {
-	  // Don't do anything if add isn't an object
-	  if (!add || !isObject(add)) return origin;
-
-	  var keys = Object.keys(add);
-	  var i = keys.length;
-	  while (i--) {
-	    origin[keys[i]] = add[keys[i]];
-	  }
-	  return origin;
-	};
-
-	function hasOwnProperty(obj, prop) {
-	  return Object.prototype.hasOwnProperty.call(obj, prop);
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }()), __webpack_require__(3)))
-
-/***/ },
-/* 3 */
-/***/ function(module, exports) {
-
-	// shim for using process in browser
-
-	var process = module.exports = {};
-	var queue = [];
-	var draining = false;
-	var currentQueue;
-	var queueIndex = -1;
-
-	function cleanUpNextTick() {
-	    if (!draining || !currentQueue) {
-	        return;
-	    }
-	    draining = false;
-	    if (currentQueue.length) {
-	        queue = currentQueue.concat(queue);
-	    } else {
-	        queueIndex = -1;
-	    }
-	    if (queue.length) {
-	        drainQueue();
-	    }
-	}
-
-	function drainQueue() {
-	    if (draining) {
-	        return;
-	    }
-	    var timeout = setTimeout(cleanUpNextTick);
-	    draining = true;
-
-	    var len = queue.length;
-	    while(len) {
-	        currentQueue = queue;
-	        queue = [];
-	        while (++queueIndex < len) {
-	            if (currentQueue) {
-	                currentQueue[queueIndex].run();
-	            }
-	        }
-	        queueIndex = -1;
-	        len = queue.length;
-	    }
-	    currentQueue = null;
-	    draining = false;
-	    clearTimeout(timeout);
-	}
-
-	process.nextTick = function (fun) {
-	    var args = new Array(arguments.length - 1);
-	    if (arguments.length > 1) {
-	        for (var i = 1; i < arguments.length; i++) {
-	            args[i - 1] = arguments[i];
-	        }
-	    }
-	    queue.push(new Item(fun, args));
-	    if (queue.length === 1 && !draining) {
-	        setTimeout(drainQueue, 0);
-	    }
-	};
-
-	// v8 likes predictible objects
-	function Item(fun, array) {
-	    this.fun = fun;
-	    this.array = array;
-	}
-	Item.prototype.run = function () {
-	    this.fun.apply(null, this.array);
-	};
-	process.title = 'browser';
-	process.browser = true;
-	process.env = {};
-	process.argv = [];
-	process.version = ''; // empty string to avoid regexp issues
-	process.versions = {};
-
-	function noop() {}
-
-	process.on = noop;
-	process.addListener = noop;
-	process.once = noop;
-	process.off = noop;
-	process.removeListener = noop;
-	process.removeAllListeners = noop;
-	process.emit = noop;
-
-	process.binding = function (name) {
-	    throw new Error('process.binding is not supported');
-	};
-
-	process.cwd = function () { return '/' };
-	process.chdir = function (dir) {
-	    throw new Error('process.chdir is not supported');
-	};
-	process.umask = function() { return 0; };
-
-
-/***/ },
-/* 4 */
-/***/ function(module, exports) {
-
-	module.exports = function isBuffer(arg) {
-	  return arg && typeof arg === 'object'
-	    && typeof arg.copy === 'function'
-	    && typeof arg.fill === 'function'
-	    && typeof arg.readUInt8 === 'function';
-	}
-
-/***/ },
-/* 5 */
-/***/ function(module, exports) {
-
-	if (typeof Object.create === 'function') {
-	  // implementation from standard node.js 'util' module
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    ctor.prototype = Object.create(superCtor.prototype, {
-	      constructor: {
-	        value: ctor,
-	        enumerable: false,
-	        writable: true,
-	        configurable: true
-	      }
-	    });
-	  };
-	} else {
-	  // old school shim for old browsers
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    var TempCtor = function () {}
-	    TempCtor.prototype = superCtor.prototype
-	    ctor.prototype = new TempCtor()
-	    ctor.prototype.constructor = ctor
-	  }
-	}
-
-
-/***/ }
-/******/ ]);
\ No newline at end of file
diff --git a/webpack.config.js b/webpack.config.js
index 46a89c67..6badafd2 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -3,8 +3,7 @@ var webpack = require('webpack');
 module.exports = {
     entry: {
         'vm': './src/index.js',
-        'vm.min': './src/index.js',
-        'vm.worker': './src/worker.js'
+        'vm.min': './src/index.js'
     },
     output: {
         path: __dirname,