Function checkStable

packages/core/src/zone/ng_zone.ts:354–385

(zone: NgZonePrivate)

}

function checkStable(zone: NgZonePrivate) {
  // TODO: @JiaLiPassion, should check zone.isCheckStableRunning to prevent
  // re-entry. The case is:
  //
  // @Component({...})
  // export class AppComponent {
  // constructor(private ngZone: NgZone) {
  //   this.ngZone.onStable.subscribe(() => {
  //     this.ngZone.run(() => console.log('stable'););
  //   });
  // }
  //
  // The onStable subscriber run another function inside ngZone
  // which causes `checkStable()` re-entry.
  // But this fix causes some issues in g3, so this fix will be
  // launched in another PR.
  if (zone._nesting == 0 && !zone.hasPendingMicrotasks && !zone.isStable) {
    try {
      zone._nesting++;
      zone.onMicrotaskEmpty.emit(null);
    } finally {
      zone._nesting--;
      if (!zone.hasPendingMicrotasks) {
        try {
          zone.runOutsideAngular(() => zone.onStable.emit(null));
        } finally {
          zone.isStable = true;
        }
      }
    }
  }
}

function delayChangeDetectionForEvents(zone: NgZonePrivate) {
  /**