Function cancelCallback

lib/assets/react-source/development/react.js:14755–14759

(callbackNode)

	  return fakeCallbackNode;
	}
	function cancelCallback(callbackNode) {
	  if (callbackNode !== fakeCallbackNode) {
	    Scheduler_cancelCallback(callbackNode);
	  }
	}
	function flushSyncCallbackQueue() {
	  if (immediateQueueCallbackNode !== null) {
	    var node = immediateQueueCallbackNode;