Function flushMutationEffects

packages/react-reconciler/src/ReactFiberWorkLoop.js:3835–3879

()

}

function flushMutationEffects(): void {
  if (pendingEffectsStatus !== PENDING_MUTATION_PHASE) {
    return;
  }
  pendingEffectsStatus = NO_PENDING_EFFECTS;

  const root = pendingEffectsRoot;
  const finishedWork = pendingFinishedWork;
  const lanes = pendingEffectsLanes;
  const subtreeMutationHasEffects =
    (finishedWork.subtreeFlags & MutationMask) !== NoFlags;
  const rootMutationHasEffect = (finishedWork.flags & MutationMask) !== NoFlags;

  if (subtreeMutationHasEffects || rootMutationHasEffect) {
    const prevTransition = ReactSharedInternals.T;
    ReactSharedInternals.T = null;
    const previousPriority = getCurrentUpdatePriority();
    setCurrentUpdatePriority(DiscreteEventPriority);
    const prevExecutionContext = executionContext;
    executionContext |= CommitContext;
    try {
      // The next phase is the mutation phase, where we mutate the host tree.
      commitMutationEffects(root, finishedWork, lanes);

      if (enableCreateEventHandleAPI) {
        if (shouldFireAfterActiveInstanceBlur) {
          afterActiveInstanceBlur();
        }
      }
      resetAfterCommit(root.containerInfo);
    } finally {
      // Reset the priority to the previous non-sync value.
      executionContext = prevExecutionContext;
      setCurrentUpdatePriority(previousPriority);
      ReactSharedInternals.T = prevTransition;
    }
  }

  // The work-in-progress tree is now the current tree. This must come after
  // the mutation phase, so that the previous tree is still current during
  // componentWillUnmount, but before the layout phase, so that the finished
  // work is current during componentDidMount/Update.
  root.current = finishedWork;
  pendingEffectsStatus = PENDING_LAYOUT_PHASE;
}

function flushLayoutEffects(): void {
  if (pendingEffectsStatus !== PENDING_LAYOUT_PHASE) {