Function scheduleTimerTrigger

packages/core/src/defer/timer_scheduler.ts:30–36

(delay: number, callback: VoidFunction, injector: Injector)

 * @param injector injector for the app.
 */
export function scheduleTimerTrigger(delay: number, callback: VoidFunction, injector: Injector) {
  const scheduler = injector.get(TimerScheduler);
  const ngZone = injector.get(NgZone);
  const cleanupFn = () => scheduler.remove(callback);
  scheduler.add(delay, callback, ngZone);
  return cleanupFn;
}

/**
 * Helper service to schedule `setTimeout`s for batches of defer blocks,