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

packages/platform-server/src/styles_host.ts

@@ -0,0 +1,36 @@
+/**
+ * @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 {ApplicationRef, Inject, Injectable, Optional} from '@angular/core';
+import {DOCUMENT, ɵSharedStylesHost as SharedStylesHost, ɵTRANSITION_ID, ɵgetDOM as getDOM} from '@angular/platform-browser';
+
+import {Parse5DomAdapter} from './parse5_adapter';
+
+@Injectable()
+export class ServerStylesHost extends SharedStylesHost {
+  private head: any = null;
+
+  constructor(
+      @Inject(DOCUMENT) private doc: any,
+      @Optional() @Inject(ɵTRANSITION_ID) private transitionId: string) {
+    super();
+    this.head = getDOM().getElementsByTagName(doc, 'head')[0];
+  }
+
+  private _addStyle(style: string): void {
+    let adapter: Parse5DomAdapter = getDOM() as Parse5DomAdapter;
+    const el = adapter.createElement('style');
+    adapter.setText(el, style);
+    if (!!this.transitionId) {
+      adapter.setAttribute(el, 'ng-transition', this.transitionId);
+    }
+    adapter.appendChild(this.head, el);
+  }
+
+  onStylesAdded(additions: Set<string>) { additions.forEach(style => this._addStyle(style)); }
+}