refactor: move angular source to /packages rather than modules/@angular

packages/common/src/platform_id.ts

@@ -0,0 +1,44 @@
+/**
+ * @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
+ */
+
+export const PLATFORM_BROWSER_ID = 'browser';
+export const PLATFORM_SERVER_ID = 'server';
+export const PLATFORM_WORKER_APP_ID = 'browserWorkerApp';
+export const PLATFORM_WORKER_UI_ID = 'browserWorkerUi';
+
+/**
+ * Returns whether a platform id represents a browser platform.
+ * @experimental
+ */
+export function isPlatformBrowser(platformId: Object): boolean {
+  return platformId === PLATFORM_BROWSER_ID;
+}
+
+/**
+ * Returns whether a platform id represents a server platform.
+ * @experimental
+ */
+export function isPlatformServer(platformId: Object): boolean {
+  return platformId === PLATFORM_SERVER_ID;
+}
+
+/**
+ * Returns whether a platform id represents a web worker app platform.
+ * @experimental
+ */
+export function isPlatformWorkerApp(platformId: Object): boolean {
+  return platformId === PLATFORM_WORKER_APP_ID;
+}
+
+/**
+ * Returns whether a platform id represents a web worker UI platform.
+ * @experimental
+ */
+export function isPlatformWorkerUi(platformId: Object): boolean {
+  return platformId === PLATFORM_WORKER_UI_ID;
+}