Function scheduleSyncCallback

lib/assets/react-source/development/react.js:14740–14754

(callback)

	  return Scheduler_scheduleCallback(priorityLevel, callback, options);
	}
	function scheduleSyncCallback(callback) {
	  // Push this callback into an internal queue. We'll flush these either in
	  // the next tick, or earlier if something calls `flushSyncCallbackQueue`.
	  if (syncQueue === null) {
	    syncQueue = [callback]; // Flush the queue in the next tick, at the earliest.

	    immediateQueueCallbackNode = Scheduler_scheduleCallback(Scheduler_ImmediatePriority, flushSyncCallbackQueueImpl);
	  } else {
	    // Push onto existing queue. Don't need to schedule a callback because
	    // we already scheduled one when we created the queue.
	    syncQueue.push(callback);
	  }

	  return fakeCallbackNode;
	}
	function cancelCallback(callbackNode) {
	  if (callbackNode !== fakeCallbackNode) {
	    Scheduler_cancelCallback(callbackNode);