feat($compile): Allow ES6 classes as controllers with bindToController: true

Modify `$injector.invoke` so ES6 classes would be invoked using `new`

Closes: #13510

Author: lgalfaso

src/auto/injector.js

@@ -821,6 +821,10 @@ function createInjector(modulesToLoad, strictDi) {
       return args;
     }
 
+    function isClass(func) {
+      return typeof func === 'function'
+        && /^class\s/.test(Function.prototype.toString.call(func));
+    }
 
     function invoke(fn, self, locals, serviceName) {
       if (typeof locals === 'string') {
@@ -833,9 +837,16 @@ function createInjector(modulesToLoad, strictDi) {
         fn = fn[fn.length - 1];
       }
 
-      // http://jsperf.com/angularjs-invoke-apply-vs-switch
-      // #5388
-      return fn.apply(self, args);
+      if (!isClass(fn)) {
+        // http://jsperf.com/angularjs-invoke-apply-vs-switch
+        // #5388
+        return fn.apply(self, args);
+      } else {
+        args.unshift(null);
+        /*jshint -W058 */ // Applying a constructor without immediate parentheses is the point here.
+        return new (Function.prototype.bind.apply(fn, args));
+        /*jshint +W058 */
+      }
     }
 
 
@@ -845,7 +856,7 @@ function createInjector(modulesToLoad, strictDi) {
       var ctor = (isArray(Type) ? Type[Type.length - 1] : Type);
       var args = injectionArgs(Type, locals, serviceName);
       // Empty object at position 0 is ignored for invocation with `new`, but required.
-      args.unshift({});
+      args.unshift(null);
       /*jshint -W058 */ // Applying a constructor without immediate parentheses is the point here.
       return new (Function.prototype.bind.apply(ctor, args));
       /*jshint +W058 */

src/ng/compile.js

@@ -214,7 +214,7 @@
  * #### `bindToController`
  * When an isolate scope is used for a component (see above), and `controllerAs` is used, `bindToController: true` will
  * allow a component to have its properties bound to the controller, rather than to scope. When the controller
- * is instantiated, the initial values of the isolate scope bindings are already available.
+ * is instantiated, the initial values of the isolate scope bindings will be available if the controller is not an ES6 class.
  *
  * #### `controller`
  * Controller constructor function. The controller is instantiated before the

test/ng/compileSpec.js

@@ -4235,6 +4235,52 @@ describe('$compile', function() {
     });
 
 
+    it('should eventually expose isolate scope variables on ES6 class controller with controllerAs when bindToController is true', function() {
+      /*jshint -W061 */
+      var controllerCalled = false;
+      module(function($compileProvider) {
+        $compileProvider.directive('fooDir', valueFn({
+          template: '<p>isolate</p>',
+          scope: {
+            'data': '=dirData',
+            'str': '@dirStr',
+            'fn': '&dirFn'
+          },
+          controller: eval(
+            "class Foo {" +
+            "  constructor($scope) {}" +
+            "  check() {" +
+            "    expect(this.data).toEqualData({" +
+            "      'foo': 'bar'," +
+            "      'baz': 'biz'" +
+            "    });" +
+            "    expect(this.str).toBe('Hello, world!');" +
+            "    expect(this.fn()).toBe('called!');" +
+            "    controllerCalled = true;" +
+            "  }" +
+            "}"
+          ),
+          controllerAs: 'test',
+          bindToController: true
+        }));
+      });
+      inject(function($compile, $rootScope) {
+        $rootScope.fn = valueFn('called!');
+        $rootScope.whom = 'world';
+        $rootScope.remoteData = {
+          'foo': 'bar',
+          'baz': 'biz'
+        };
+        element = $compile('<div foo-dir dir-data="remoteData" ' +
+                                 'dir-str="Hello, {{whom}}!" ' +
+                                 'dir-fn="fn()"></div>')($rootScope);
+        element.data('$fooDirController').check();
+        expect(controllerCalled).toBe(true);
+      });
+      /*jshint +W061 */
+    });
+
+
     it('should update @-bindings on controller when bindToController and attribute change observed', function() {
       module(function($compileProvider) {
         $compileProvider.directive('atBinding', valueFn({