Method whenStable

packages/core/src/testability/testability.ts:244–253

* Wait for the application to be stable with a timeout. If the timeout is reached before that * happens, the callback receives a list of the macro tasks that were pending, otherwise null. * * @param doneCb The callback to invoke when Angular is stable or the timeout expires * whicheve

(doneCb: Function, timeout?: number, updateCb?: Function)

   *    and no further updates will be issued.
   */
  whenStable(doneCb: Function, timeout?: number, updateCb?: Function): void {
    if (updateCb && !this._taskTrackingZone) {
      throw new Error(
        'Task tracking zone is required when passing an update callback to ' +
          'whenStable(). Is "zone.js/plugins/task-tracking" loaded?',
      );
    }
    this.addCallback(doneCb, timeout, updateCb);
    this._runCallbacksIfReady();
  }

  /**
   * Registers an application with a testability hook so that it can be tracked.