fix(packages): use ES modules for primary build (#11120)

modules/@angular/platform-browser-dynamic/testing/private_export_testing.ts

@@ -0,0 +1,14 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import * as testing from './dom_test_component_renderer';
+
+export var __platform_browser_dynamic_private__:
+    {DOMTestComponentRenderer: typeof testing.DOMTestComponentRenderer} = {
+      DOMTestComponentRenderer: testing.DOMTestComponentRenderer
+    };