Function drainMicroTaskQueueSynchronously

packages/zone.js/lib/zone-impl.ts:1552–1585

()

  }

  function drainMicroTaskQueueSynchronously() {
    if (_isDrainingMicrotaskQueue) {
      return;
    }

    _isDrainingMicrotaskQueue = true;

    try {
      while (_microTaskQueue.length) {
        const queue = _microTaskQueue;
        _microTaskQueue = [];

        for (const task of queue) {
          try {
            task.zone.runTask(task, null, null);
          } catch (error) {
            _api.onUnhandledError(error as Error);
          }
        }
      }
    } finally {
      // The order matters!
      if (global[enableNativeMicrotaskDraining]) {
        _isDrainingMicrotaskQueue = false;
        _api.microtaskDrainDone();
      } else {
        try {
          _api.microtaskDrainDone();
        } finally {
          _isDrainingMicrotaskQueue = false;
        }
      }
    }
  }

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