build(broccoli): make node_trees produce strict-mode scripts

Closes #2575
Closes #2648

modules/angular2/src/util/decorators.ts

@@ -127,6 +127,10 @@ export function makeParamDecorator(annotationCls): any {
     if (this instanceof annotationCls) {
       return annotationInstance;
     } else {
+      (<any>ParamDecorator).annotation = annotationInstance;
+      return ParamDecorator;
+    }
+
     function ParamDecorator(cls, unusedKey, index) {
       var parameters: Array<Array<any>> = Reflect.getMetadata('parameters', cls);
       parameters = parameters || [];
@@ -144,10 +148,6 @@ export function makeParamDecorator(annotationCls): any {
       Reflect.defineMetadata('parameters', parameters, cls);
       return cls;
     }
-
-      (<any>ParamDecorator).annotation = annotationInstance;
-      return ParamDecorator;
-    }
   }
   ParamDecoratorFactory.prototype = Object.create(annotationCls.prototype);
   return ParamDecoratorFactory;

modules/angular2/test/core/compiler/integration_spec.ts

@@ -1209,8 +1209,6 @@ export function main() {
     // - https://github.com/angular/angular/issues/776
     // - https://github.com/angular/angular/commit/81f3f32
     xdescribe('Missing directive checks', () => {
-
-      if (assertionsEnabled()) {
       function expectCompileError(tb, inlineTpl, errMessage, done) {
         tb.overrideView(MyComp, new viewAnn.View({template: inlineTpl}));
         PromiseWrapper.then(
@@ -1225,6 +1223,7 @@ export function main() {
             });
       }
 
+      if (assertionsEnabled()) {
         it('should raise an error if no directive is registered for a template with template bindings',
            inject([TestBed, AsyncTestCompleter], (tb: TestBed, async) => {
              expectCompileError(tb, '<div><div template="if: foo"></div></div>',

tools/broccoli/trees/node_tree.ts

@@ -127,5 +127,12 @@ module.exports = function makeNodeTree(destinationPath) {
     ]
   });
 
+  // Prepend 'use strict' directive to all JS files.
+  // See https://github.com/Microsoft/TypeScript/issues/3576
+  nodeTree = replace(nodeTree, {
+    files: ['**/*.js'],
+    patterns: [{match: /^/, replacement: function() { return `'use strict';` }}]
+  });
+
   return destCopy(nodeTree, destinationPath);
 };