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

modules/@angular/core/src/core.ts

@@ -0,0 +1,37 @@
+/**
+ * @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
+ */
+
+/**
+ * @module
+ * @description
+ * Entry point from which you should import all public core APIs.
+ */
+export * from './metadata';
+export * from './util';
+export * from './di';
+export {createPlatform, assertPlatform, destroyPlatform, getPlatform, PlatformRef, ApplicationRef, enableProdMode, isDevMode, createPlatformFactory} from './application_ref';
+export {APP_ID, PACKAGE_ROOT_URL, PLATFORM_INITIALIZER, APP_BOOTSTRAP_LISTENER} from './application_tokens';
+export {APP_INITIALIZER, ApplicationInitStatus} from './application_init';
+export * from './zone';
+export * from './render';
+export * from './linker';
+export {DebugElement, DebugNode, asNativeElements, getDebugNode} from './debug/debug_node';
+export {GetTestability, Testability, TestabilityRegistry, setTestabilityGetter} from './testability/testability';
+export * from './change_detection';
+export * from './platform_core_providers';
+export {TRANSLATIONS, TRANSLATIONS_FORMAT, LOCALE_ID} from './i18n/tokens';
+export {ApplicationModule} from './application_module';
+export {wtfCreateScope, wtfLeave, wtfStartTimeRange, wtfEndTimeRange, WtfScopeFn} from './profile/profile';
+export {Type} from './type';
+export {EventEmitter} from './facade/async';
+export {ErrorHandler} from './error_handler';
+export * from './core_private_export';
+export * from './animation/metadata';
+export {AnimationTransitionEvent} from './animation/animation_transition_event';
+export {AnimationPlayer} from './animation/animation_player';
+export {Sanitizer, SecurityContext} from './security';