Added BabylonJS dependency checker to Canvas2D

So as to inform developers of their mistake more clearly and as an added bonus, provide compatibility with Webpack's ProvidePlugin.

canvas2D/gulp-addModuleExports.js

@@ -18,11 +18,16 @@ module.exports = function (varName) {
         '};\n';
 
         var decorateAddition =
-        'var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {\n' +
-            'var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;\n' +
-            'if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);\n' +
-            'else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;\n' +
-            'return c > 3 && r && Object.defineProperty(target, key, r), r;\n' +
+        'var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {\n' +
+            'var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;\n' +
+            'if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);\n' +
+            'else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;\n' +
+            'return c > 3 && r && Object.defineProperty(target, key, r), r;\n' +
+        '};\n';
+
+        var dependencyAddition =
+        'if (typeof BABYLON === "undefined") {\n' +
+            'throw "BabylonJS is a required dependency, please include it first!"\n' +
         '};\n';
 
         if (file.isNull()) {
@@ -36,7 +41,7 @@ module.exports = function (varName) {
         }
 
         try {
-            file.contents = new Buffer(decorateAddition.concat(new Buffer(extendsAddition.concat(String(file.contents)).concat(moduleExportsAddition))));
+            file.contents = new Buffer(decorateAddition.concat(new Buffer(extendsAddition.concat(dependencyAddition).concat(String(file.contents)).concat(moduleExportsAddition))));
             this.push(file);
 
         } catch (err) {