Method _updateTaskCount

packages/zone.js/lib/zone-impl.ts:1087–1095

(task: ZoneTask<any>, count: number)

    }

    private _updateTaskCount(task: ZoneTask<any>, count: number) {
      const zoneDelegates = task._zoneDelegates!;
      if (count == -1) {
        task._zoneDelegates = null;
      }
      for (let i = 0; i < zoneDelegates.length; i++) {
        zoneDelegates[i]._updateTaskCount(task.type, count);
      }
    }
  }

  const DELEGATE_ZS: ZoneSpec = {