Function cancelCallback

packages/react-reconciler/src/ReactFiberRootScheduler.js:641–648

(callbackNode: mixed)

}

function cancelCallback(callbackNode: mixed) {
  if (__DEV__ && callbackNode === fakeActCallbackNode) {
    // Special `act` case: check if this is the fake callback node used by
    // the `act` implementation.
  } else if (callbackNode !== null) {
    Scheduler_cancelCallback(callbackNode);
  }
}

function scheduleImmediateRootScheduleTask() {
  if (__DEV__ && ReactSharedInternals.actQueue !== null) {