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

packages/platform-browser/src/browser/tools/common_tools.ts

@@ -0,0 +1,71 @@
+/**
+ * @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, ComponentRef} from '@angular/core';
+import {getDOM} from '../../dom/dom_adapter';
+import {window} from './browser';
+
+export class ChangeDetectionPerfRecord {
+  constructor(public msPerTick: number, public numTicks: number) {}
+}
+
+/**
+ * Entry point for all Angular profiling-related debug tools. This object
+ * corresponds to the `ng.profiler` in the dev console.
+ */
+export class AngularProfiler {
+  appRef: ApplicationRef;
+
+  constructor(ref: ComponentRef<any>) { this.appRef = ref.injector.get(ApplicationRef); }
+
+  // tslint:disable:no-console
+  /**
+   * Exercises change detection in a loop and then prints the average amount of
+   * time in milliseconds how long a single round of change detection takes for
+   * the current state of the UI. It runs a minimum of 5 rounds for a minimum
+   * of 500 milliseconds.
+   *
+   * Optionally, a user may pass a `config` parameter containing a map of
+   * options. Supported options are:
+   *
+   * `record` (boolean) - causes the profiler to record a CPU profile while
+   * it exercises the change detector. Example:
+   *
+   * ```
+   * ng.profiler.timeChangeDetection({record: true})
+   * ```
+   */
+  timeChangeDetection(config: any): ChangeDetectionPerfRecord {
+    const record = config && config['record'];
+    const profileName = 'Change Detection';
+    // Profiler is not available in Android browsers, nor in IE 9 without dev tools opened
+    const isProfilerAvailable = window.console.profile != null;
+    if (record && isProfilerAvailable) {
+      window.console.profile(profileName);
+    }
+    const start = getDOM().performanceNow();
+    let numTicks = 0;
+    while (numTicks < 5 || (getDOM().performanceNow() - start) < 500) {
+      this.appRef.tick();
+      numTicks++;
+    }
+    const end = getDOM().performanceNow();
+    if (record && isProfilerAvailable) {
+      // need to cast to <any> because type checker thinks there's no argument
+      // while in fact there is:
+      //
+      // https://developer.mozilla.org/en-US/docs/Web/API/Console/profileEnd
+      (<any>window.console.profileEnd)(profileName);
+    }
+    const msPerTick = (end - start) / numTicks;
+    window.console.log(`ran ${numTicks} change detection cycles`);
+    window.console.log(`${msPerTick.toFixed(2)} ms per check`);
+
+    return new ChangeDetectionPerfRecord(msPerTick, numTicks);
+  }
+}