diff --git a/modules/angular2/angular2_sfx.es6 b/modules/angular2/angular2_sfx.ts
similarity index 55%
rename from modules/angular2/angular2_sfx.es6
rename to modules/angular2/angular2_sfx.ts
index 35f5d3914a..ef31e617ec 100644
--- a/modules/angular2/angular2_sfx.es6
+++ b/modules/angular2/angular2_sfx.ts
@@ -1,20 +1,30 @@
-import * as angular from './angular2';
+import * as ng from './angular2';
 // the router should have its own SFX bundle
 // But currently the module arithemtic 'angular2/router_sfx - angular2/angular2',
 // is not support by system builder.
 import * as router from './router';
 
+var angular: AngularOne = <any>ng;
+(<AngularWindow>window).angular = angular;
+
+var _prevAngular = (<AngularWindow>window).angular;
+
+
 angular.router = router;
-
-var _prevAngular = window.angular;
-
 /**
  * Calling noConflict will restore window.angular to its pre-angular loading state
  * and return the angular module object.
  */
 angular.noConflict = function() {
-  window.angular = _prevAngular;
+  (<AngularWindow>window).angular = _prevAngular;
   return angular;
 };
 
-window.angular = angular;
+interface AngularOne {
+  router: any;
+  noConflict(): any;
+}
+
+interface AngularWindow extends Window {
+  angular: any;
+}