Function flushPassiveEffectsImpl

packages/react-reconciler/src/ReactFiberWorkLoop.js:4489–4636

()

}

function flushPassiveEffectsImpl() {
  // Cache and clear the transitions flag
  const transitions = pendingPassiveTransitions;
  pendingPassiveTransitions = null;

  const root = pendingEffectsRoot;
  const lanes = pendingEffectsLanes;
  pendingEffectsStatus = NO_PENDING_EFFECTS;
  pendingEffectsRoot = (null: any); // Clear for GC purposes.
  pendingFinishedWork = (null: any); // Clear for GC purposes.
  // TODO: This is sometimes out of sync with pendingEffectsRoot.
  // Figure out why and fix it. It's not causing any known issues (probably
  // because it's only used for profiling), but it's a refactor hazard.
  pendingEffectsLanes = NoLanes;

  if (enableYieldingBeforePassive) {
    // We've finished our work for this render pass.
    root.callbackNode = null;
    root.callbackPriority = NoLane;
  }

  if ((executionContext & (RenderContext | CommitContext)) !== NoContext) {
    throw new Error('Cannot flush passive effects while already rendering.');
  }

  if (enableProfilerTimer && enableComponentPerformanceTrack) {
    // We're about to log a lot of profiling for this commit.
    // We set this once so we don't have to recompute it for every log.
    setCurrentTrackFromLanes(lanes);
  }

  if (__DEV__) {
    isFlushingPassiveEffects = true;
    didScheduleUpdateDuringPassiveEffects = false;
  }

  let passiveEffectStartTime = 0;
  if (enableProfilerTimer && enableComponentPerformanceTrack) {
    resetCommitErrors();
    passiveEffectStartTime = now();
    if (pendingDelayedCommitReason === ANIMATION_STARTED_COMMIT) {
      // The animation was started, so we've been animating since that happened.
      logAnimatingPhase(commitEndTime, passiveEffectStartTime, animatingTask);
    } else {
      logPaintYieldPhase(
        commitEndTime,
        passiveEffectStartTime,
        pendingDelayedCommitReason === DELAYED_PASSIVE_COMMIT,
        workInProgressUpdateTask,
      );
    }
  }

  if (enableSchedulingProfiler) {
    markPassiveEffectsStarted(lanes);
  }

  const prevExecutionContext = executionContext;