ReactFiberWorkLoop.new.js

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */

import type {Thenable, Wakeable} from 'shared/ReactTypes';
import type {Fiber, FiberRoot} from './ReactInternalTypes';
import type {Lanes, Lane} from './ReactFiberLane.new';
import type {SuspenseState} from './ReactFiberSuspenseComponent.new';
import type {StackCursor} from './ReactFiberStack.new';
import type {FunctionComponentUpdateQueue} from './ReactFiberHooks.new';
import type {Flags} from './ReactFiberFlags';

import {
  warnAboutDeprecatedLifecycles,
  enableSuspenseServerRenderer,
  replayFailedUnitOfWorkWithInvokeGuardedCallback,
  enableProfilerTimer,
  enableProfilerCommitHooks,
  enableProfilerNestedUpdatePhase,
  enableProfilerNestedUpdateScheduledHook,
  warnAboutUnmockedScheduler,
  deferRenderPhaseUpdateToNextBatch,
  enableDebugTracing,
  enableSchedulingProfiler,
  disableSchedulerTimeoutInWorkLoop,
  enableStrictEffects,
  skipUnmountedBoundaries,
  enableUpdaterTracking,
} from 'shared/ReactFeatureFlags';
import ReactSharedInternals from 'shared/ReactSharedInternals';
import invariant from 'shared/invariant';

import {
  scheduleCallback,
  cancelCallback,
  shouldYield,
  requestPaint,
  now,
  ImmediatePriority as ImmediateSchedulerPriority,
  UserBlockingPriority as UserBlockingSchedulerPriority,
  NormalPriority as NormalSchedulerPriority,
  IdlePriority as IdleSchedulerPriority,
} from './Scheduler';
import {
  flushSyncCallbacks,
  flushSyncCallbacksOnlyInLegacyMode,
  scheduleSyncCallback,
  scheduleLegacySyncCallback,
} from './ReactFiberSyncTaskQueue.new';
import {
  NoFlags as NoHookEffect,
  Passive as HookPassive,
} from './ReactHookEffectTags';
import {
  logCommitStarted,
  logCommitStopped,
  logLayoutEffectsStarted,
  logLayoutEffectsStopped,
  logPassiveEffectsStarted,
  logPassiveEffectsStopped,
  logRenderStarted,
  logRenderStopped,
} from './DebugTracing';
import {
  markCommitStarted,
  markCommitStopped,
  markLayoutEffectsStarted,
  markLayoutEffectsStopped,
  markPassiveEffectsStarted,
  markPassiveEffectsStopped,
  markRenderStarted,
  markRenderYielded,
  markRenderStopped,
} from './SchedulingProfiler';

// The scheduler is imported here *only* to detect whether it's been mocked
import * as Scheduler from 'scheduler';

import {
  resetAfterCommit,
  scheduleTimeout,
  cancelTimeout,
  noTimeout,
  warnsIfNotActing,
  afterActiveInstanceBlur,
  clearContainer,
  getCurrentEventPriority,
  supportsMicrotasks,
  errorHydratingContainer,
  scheduleMicrotask,
} from './ReactFiberHostConfig';

import {
  createWorkInProgress,
  assignFiberPropertiesInDEV,
} from './ReactFiber.new';
import {
  NoMode,
  StrictLegacyMode,
  ProfileMode,
  ConcurrentMode,
} from './ReactTypeOfMode';
import {
  HostRoot,
  IndeterminateComponent,
  ClassComponent,
  SuspenseComponent,
  SuspenseListComponent,
  FunctionComponent,
  ForwardRef,
  MemoComponent,
  SimpleMemoComponent,
  Profiler,
} from './ReactWorkTags';
import {LegacyRoot} from './ReactRootTags';
import {
  NoFlags,
  Placement,
  PassiveStatic,
  Incomplete,
  HostEffectMask,
  Hydrating,
  BeforeMutationMask,
  MutationMask,
  LayoutMask,
  PassiveMask,
  MountPassiveDev,
  MountLayoutDev,
} from './ReactFiberFlags';
import {
  NoLanes,
  NoLane,
  SyncLane,
  NoTimestamp,
  claimNextTransitionLane,
  claimNextRetryLane,
  includesSomeLane,
  isSubsetOfLanes,
  mergeLanes,
  removeLanes,
  pickArbitraryLane,
  includesNonIdleWork,
  includesOnlyRetries,
  includesOnlyTransitions,
  shouldTimeSlice,
  getNextLanes,
  markStarvedLanesAsExpired,
  getLanesToRetrySynchronouslyOnError,
  getMostRecentEventTime,
  markRootUpdated,
  markRootSuspended as markRootSuspended_dontCallThisOneDirectly,
  markRootPinged,
  markRootEntangled,
  markRootFinished,
  getHighestPriorityLane,
  addFiberToLanesMap,
  movePendingFibersToMemoized,
} from './ReactFiberLane.new';
import {
  DiscreteEventPriority,
  ContinuousEventPriority,
  DefaultEventPriority,
  IdleEventPriority,
  getCurrentUpdatePriority,
  setCurrentUpdatePriority,
  lowerEventPriority,
  lanesToEventPriority,
} from './ReactEventPriorities.new';
import {requestCurrentTransition, NoTransition} from './ReactFiberTransition';
import {beginWork as originalBeginWork} from './ReactFiberBeginWork.new';
import {completeWork} from './ReactFiberCompleteWork.new';
import {unwindWork, unwindInterruptedWork} from './ReactFiberUnwindWork.new';
import {
  throwException,
  createRootErrorUpdate,
  createClassErrorUpdate,
} from './ReactFiberThrow.new';
import {
  commitBeforeMutationEffects,
  commitLayoutEffects,
  commitMutationEffects,
  commitPassiveEffectDurations,
  commitPassiveMountEffects,
  commitPassiveUnmountEffects,
  invokeLayoutEffectMountInDEV,
  invokePassiveEffectMountInDEV,
  invokeLayoutEffectUnmountInDEV,
  invokePassiveEffectUnmountInDEV,
} from './ReactFiberCommitWork.new';
import {enqueueUpdate} from './ReactUpdateQueue.new';
import {resetContextDependencies} from './ReactFiberNewContext.new';
import {
  resetHooksAfterThrow,
  ContextOnlyDispatcher,
  getIsUpdatingOpaqueValueInRenderPhaseInDEV,
} from './ReactFiberHooks.new';
import {createCapturedValue} from './ReactCapturedValue';
import {
  push as pushToStack,
  pop as popFromStack,
  createCursor,
} from './ReactFiberStack.new';
import {enqueueInterleavedUpdates} from './ReactFiberInterleavedUpdates.new';

import {
  markNestedUpdateScheduled,
  recordCommitTime,
  resetNestedUpdateFlag,
  startProfilerTimer,
  stopProfilerTimerIfRunningAndRecordDelta,
  syncNestedUpdateFlag,
} from './ReactProfilerTimer.new';

// DEV stuff
import getComponentNameFromFiber from 'react-reconciler/src/getComponentNameFromFiber';
import ReactStrictModeWarnings from './ReactStrictModeWarnings.new';
import {
  isRendering as ReactCurrentDebugFiberIsRenderingInDEV,
  current as ReactCurrentFiberCurrent,
  resetCurrentFiber as resetCurrentDebugFiberInDEV,
  setCurrentFiber as setCurrentDebugFiberInDEV,
} from './ReactCurrentFiber';
import {
  invokeGuardedCallback,
  hasCaughtError,
  clearCaughtError,
} from 'shared/ReactErrorUtils';
import {
  onCommitRoot as onCommitRootDevTools,
  onPostCommitRoot as onPostCommitRootDevTools,
  isDevToolsPresent,
} from './ReactFiberDevToolsHook.new';
import {onCommitRoot as onCommitRootTestSelector} from './ReactTestSelectors';

// Used by `act`
import enqueueTask from 'shared/enqueueTask';

const ceil = Math.ceil;

const {
  ReactCurrentDispatcher,
  ReactCurrentOwner,
  ReactCurrentBatchConfig,
  IsSomeRendererActing,
} = ReactSharedInternals;

type ExecutionContext = number;

export const NoContext = /*             */ 0b000000;
const BatchedContext = /*               */ 0b000001;
const EventContext = /*                 */ 0b000010;
const LegacyUnbatchedContext = /*       */ 0b000100;
const RenderContext = /*                */ 0b001000;
const CommitContext = /*                */ 0b010000;
export const RetryAfterError = /*       */ 0b100000;

type RootExitStatus = 0 | 1 | 2 | 3 | 4 | 5;
const RootIncomplete = 0;
const RootFatalErrored = 1;
const RootErrored = 2;
const RootSuspended = 3;
const RootSuspendedWithDelay = 4;
const RootCompleted = 5;

// Describes where we are in the React execution stack
let executionContext: ExecutionContext = NoContext;
// The root we're working on
let workInProgressRoot: FiberRoot | null = null;
// The fiber we're working on
let workInProgress: Fiber | null = null;
// The lanes we're rendering
let workInProgressRootRenderLanes: Lanes = NoLanes;

// Stack that allows components to change the render lanes for its subtree
// This is a superset of the lanes we started working on at the root. The only
// case where it's different from `workInProgressRootRenderLanes` is when we
// enter a subtree that is hidden and needs to be unhidden: Suspense and
// Offscreen component.
//
// Most things in the work loop should deal with workInProgressRootRenderLanes.
// Most things in begin/complete phases should deal with subtreeRenderLanes.
export let subtreeRenderLanes: Lanes = NoLanes;
const subtreeRenderLanesCursor: StackCursor<Lanes> = createCursor(NoLanes);

// Whether to root completed, errored, suspended, etc.
let workInProgressRootExitStatus: RootExitStatus = RootIncomplete;
// A fatal error, if one is thrown
let workInProgressRootFatalError: mixed = null;
// "Included" lanes refer to lanes that were worked on during this render. It's
// slightly different than `renderLanes` because `renderLanes` can change as you
// enter and exit an Offscreen tree. This value is the combination of all render
// lanes for the entire render phase.
let workInProgressRootIncludedLanes: Lanes = NoLanes;
// The work left over by components that were visited during this render. Only
// includes unprocessed updates, not work in bailed out children.
let workInProgressRootSkippedLanes: Lanes = NoLanes;
// Lanes that were updated (in an interleaved event) during this render.
let workInProgressRootUpdatedLanes: Lanes = NoLanes;
// Lanes that were pinged (in an interleaved event) during this render.
let workInProgressRootPingedLanes: Lanes = NoLanes;

// The most recent time we committed a fallback. This lets us ensure a train
// model where we don't commit new loading states in too quick succession.
let globalMostRecentFallbackTime: number = 0;
const FALLBACK_THROTTLE_MS: number = 500;

// The absolute time for when we should start giving up on rendering
// more and prefer CPU suspense heuristics instead.
let workInProgressRootRenderTargetTime: number = Infinity;
// How long a render is supposed to take before we start following CPU
// suspense heuristics and opt out of rendering more content.
const RENDER_TIMEOUT_MS = 500;

function resetRenderTimer() {
  workInProgressRootRenderTargetTime = now() + RENDER_TIMEOUT_MS;
}

export function getRenderTargetTime(): number {
  return workInProgressRootRenderTargetTime;
}

let hasUncaughtError = false;
let firstUncaughtError = null;
let legacyErrorBoundariesThatAlreadyFailed: Set<mixed> | null = null;

// Only used when enableProfilerNestedUpdateScheduledHook is true;
// to track which root is currently committing layout effects.
let rootCommittingMutationOrLayoutEffects: FiberRoot | null = null;

let rootDoesHavePassiveEffects: boolean = false;
let rootWithPendingPassiveEffects: FiberRoot | null = null;
let pendingPassiveEffectsLanes: Lanes = NoLanes;
let pendingPassiveProfilerEffects: Array<Fiber> = [];

// Use these to prevent an infinite loop of nested updates
const NESTED_UPDATE_LIMIT = 50;
let nestedUpdateCount: number = 0;
let rootWithNestedUpdates: FiberRoot | null = null;

const NESTED_PASSIVE_UPDATE_LIMIT = 50;
let nestedPassiveUpdateCount: number = 0;

// If two updates are scheduled within the same event, we should treat their
// event times as simultaneous, even if the actual clock time has advanced
// between the first and second call.
let currentEventTime: number = NoTimestamp;
let currentEventTransitionLane: Lanes = NoLanes;

// Dev only flag that tracks if passive effects are currently being flushed.
// We warn about state updates for unmounted components differently in this case.
let isFlushingPassiveEffects = false;

export function getWorkInProgressRoot(): FiberRoot | null {
  return workInProgressRoot;
}

export function requestEventTime() {
  if ((executionContext & (RenderContext | CommitContext)) !== NoContext) {
    // We're inside React, so it's fine to read the actual time.
    return now();
  }
  // We're not inside React, so we may be in the middle of a browser event.
  if (currentEventTime !== NoTimestamp) {
    // Use the same start time for all updates until we enter React again.
    return currentEventTime;
  }
  // This is the first update since React yielded. Compute a new start time.
  currentEventTime = now();
  return currentEventTime;
}

export function getCurrentTime() {
  return now();
}

export function requestUpdateLane(fiber: Fiber): Lane {
  // Special cases
  const mode = fiber.mode;
  if ((mode & ConcurrentMode) === NoMode) {
    return (SyncLane: Lane);
  } else if (
    !deferRenderPhaseUpdateToNextBatch &&
    (executionContext & RenderContext) !== NoContext &&
    workInProgressRootRenderLanes !== NoLanes
  ) {
    // This is a render phase update. These are not officially supported. The
    // old behavior is to give this the same "thread" (lanes) as
    // whatever is currently rendering. So if you call `setState` on a component
    // that happens later in the same render, it will flush. Ideally, we want to
    // remove the special case and treat them as if they came from an
    // interleaved event. Regardless, this pattern is not officially supported.
    // This behavior is only a fallback. The flag only exists until we can roll
    // out the setState warning, since existing code might accidentally rely on
    // the current behavior.
    return pickArbitraryLane(workInProgressRootRenderLanes);
  }

  const isTransition = requestCurrentTransition() !== NoTransition;
  if (isTransition) {
    // The algorithm for assigning an update to a lane should be stable for all
    // updates at the same priority within the same event. To do this, the
    // inputs to the algorithm must be the same.
    //
    // The trick we use is to cache the first of each of these inputs within an
    // event. Then reset the cached values once we can be sure the event is
    // over. Our heuristic for that is whenever we enter a concurrent work loop.
    if (currentEventTransitionLane === NoLane) {
      // All transitions within the same event are assigned the same lane.
      currentEventTransitionLane = claimNextTransitionLane();
    }
    return currentEventTransitionLane;
  }

  // Updates originating inside certain React methods, like flushSync, have
  // their priority set by tracking it with a context variable.
  //
  // The opaque type returned by the host config is internally a lane, so we can
  // use that directly.
  // TODO: Move this type conversion to the event priority module.
  const updateLane: Lane = (getCurrentUpdatePriority(): any);
  if (updateLane !== NoLane) {
    return updateLane;
  }

  // This update originated outside React. Ask the host environment for an
  // appropriate priority, based on the type of event.
  //
  // The opaque type returned by the host config is internally a lane, so we can
  // use that directly.
  // TODO: Move this type conversion to the event priority module.
  const eventLane: Lane = (getCurrentEventPriority(): any);
  return eventLane;
}

function requestRetryLane(fiber: Fiber) {
  // This is a fork of `requestUpdateLane` designed specifically for Suspense
  // "retries" — a special update that attempts to flip a Suspense boundary
  // from its placeholder state to its primary/resolved state.

  // Special cases
  const mode = fiber.mode;
  if ((mode & ConcurrentMode) === NoMode) {
    return (SyncLane: Lane);
  }

  return claimNextRetryLane();
}

export function scheduleUpdateOnFiber(
  fiber: Fiber,
  lane: Lane,
  eventTime: number,
): FiberRoot | null {
  checkForNestedUpdates();
  warnAboutRenderPhaseUpdatesInDEV(fiber);

  const root = markUpdateLaneFromFiberToRoot(fiber, lane);
  if (root === null) {
    warnAboutUpdateOnUnmountedFiberInDEV(fiber);
    return null;
  }

  if (enableUpdaterTracking) {
    if (isDevToolsPresent) {
      addFiberToLanesMap(root, fiber, lane);
    }
  }

  // Mark that the root has a pending update.
  markRootUpdated(root, lane, eventTime);

  if (enableProfilerTimer && enableProfilerNestedUpdateScheduledHook) {
    if (
      (executionContext & CommitContext) !== NoContext &&
      root === rootCommittingMutationOrLayoutEffects
    ) {
      if (fiber.mode & ProfileMode) {
        let current = fiber;
        while (current !== null) {
          if (current.tag === Profiler) {
            const {id, onNestedUpdateScheduled} = current.memoizedProps;
            if (typeof onNestedUpdateScheduled === 'function') {
              onNestedUpdateScheduled(id);
            }
          }
          current = current.return;
        }
      }
    }
  }

  // TODO: Consolidate with `isInterleavedUpdate` check
  if (root === workInProgressRoot) {
    // Received an update to a tree that's in the middle of rendering. Mark
    // that there was an interleaved update work on this root. Unless the
    // `deferRenderPhaseUpdateToNextBatch` flag is off and this is a render
    // phase update. In that case, we don't treat render phase updates as if
    // they were interleaved, for backwards compat reasons.
    if (
      deferRenderPhaseUpdateToNextBatch ||
      (executionContext & RenderContext) === NoContext
    ) {
      workInProgressRootUpdatedLanes = mergeLanes(
        workInProgressRootUpdatedLanes,
        lane,
      );
    }
    if (workInProgressRootExitStatus === RootSuspendedWithDelay) {
      // The root already suspended with a delay, which means this render
      // definitely won't finish. Since we have a new update, let's mark it as
      // suspended now, right before marking the incoming update. This has the
      // effect of interrupting the current render and switching to the update.
      // TODO: Make sure this doesn't override pings that happen while we've
      // already started rendering.
      markRootSuspended(root, workInProgressRootRenderLanes);
    }
  }

  if (lane === SyncLane) {
    if (
      // Check if we're inside unbatchedUpdates
      (executionContext & LegacyUnbatchedContext) !== NoContext &&
      // Check if we're not already rendering
      (executionContext & (RenderContext | CommitContext)) === NoContext
    ) {
      // This is a legacy edge case. The initial mount of a ReactDOM.render-ed
      // root inside of batchedUpdates should be synchronous, but layout updates
      // should be deferred until the end of the batch.
      performSyncWorkOnRoot(root);
    } else {
      ensureRootIsScheduled(root, eventTime);
      if (
        executionContext === NoContext &&
        (fiber.mode & ConcurrentMode) === NoMode
      ) {
        // Flush the synchronous work now, unless we're already working or inside
        // a batch. This is intentionally inside scheduleUpdateOnFiber instead of
        // scheduleCallbackForFiber to preserve the ability to schedule a callback
        // without immediately flushing it. We only do this for user-initiated
        // updates, to preserve historical behavior of legacy mode.
        resetRenderTimer();
        flushSyncCallbacksOnlyInLegacyMode();
      }
    }
  } else {
    // Schedule other updates after in case the callback is sync.
    ensureRootIsScheduled(root, eventTime);
  }

  return root;
}

// This is split into a separate function so we can mark a fiber with pending
// work without treating it as a typical update that originates from an event;
// e.g. retrying a Suspense boundary isn't an update, but it does schedule work
// on a fiber.
function markUpdateLaneFromFiberToRoot(
  sourceFiber: Fiber,
  lane: Lane,
): FiberRoot | null {
  // Update the source fiber's lanes
  sourceFiber.lanes = mergeLanes(sourceFiber.lanes, lane);
  let alternate = sourceFiber.alternate;
  if (alternate !== null) {
    alternate.lanes = mergeLanes(alternate.lanes, lane);
  }
  if (__DEV__) {
    if (
      alternate === null &&
      (sourceFiber.flags & (Placement | Hydrating)) !== NoFlags
    ) {
      warnAboutUpdateOnNotYetMountedFiberInDEV(sourceFiber);
    }
  }
  // Walk the parent path to the root and update the child lanes.
  let node = sourceFiber;
  let parent = sourceFiber.return;
  while (parent !== null) {
    parent.childLanes = mergeLanes(parent.childLanes, lane);
    alternate = parent.alternate;
    if (alternate !== null) {
      alternate.childLanes = mergeLanes(alternate.childLanes, lane);
    } else {
      if (__DEV__) {
        if ((parent.flags & (Placement | Hydrating)) !== NoFlags) {
          warnAboutUpdateOnNotYetMountedFiberInDEV(sourceFiber);
        }
      }
    }
    node = parent;
    parent = parent.return;
  }
  if (node.tag === HostRoot) {
    const root: FiberRoot = node.stateNode;
    return root;
  } else {
    return null;
  }
}

export function isInterleavedUpdate(fiber: Fiber, lane: Lane) {
  return (
    // TODO: Optimize slightly by comparing to root that fiber belongs to.
    // Requires some refactoring. Not a big deal though since it's rare for
    // concurrent apps to have more than a single root.
    workInProgressRoot !== null &&
    (fiber.mode & ConcurrentMode) !== NoMode &&
    // If this is a render phase update (i.e. UNSAFE_componentWillReceiveProps),
    // then don't treat this as an interleaved update. This pattern is
    // accompanied by a warning but we haven't fully deprecated it yet. We can
    // remove once the deferRenderPhaseUpdateToNextBatch flag is enabled.
    (deferRenderPhaseUpdateToNextBatch ||
      (executionContext & RenderContext) === NoContext)
  );
}

// Use this function to schedule a task for a root. There's only one task per
// root; if a task was already scheduled, we'll check to make sure the priority
// of the existing task is the same as the priority of the next level that the
// root has work on. This function is called on every update, and right before
// exiting a task.
function ensureRootIsScheduled(root: FiberRoot, currentTime: number) {
  const existingCallbackNode = root.callbackNode;

  // Check if any lanes are being starved by other work. If so, mark them as
  // expired so we know to work on those next.
  markStarvedLanesAsExpired(root, currentTime);

  // Determine the next lanes to work on, and their priority.
  const nextLanes = getNextLanes(
    root,
    root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes,
  );

  if (nextLanes === NoLanes) {
    // Special case: There's nothing to work on.
    if (existingCallbackNode !== null) {
      cancelCallback(existingCallbackNode);
    }
    root.callbackNode = null;
    root.callbackPriority = NoLane;
    return;
  }

  // We use the highest priority lane to represent the priority of the callback.
  const newCallbackPriority = getHighestPriorityLane(nextLanes);

  // Check if there's an existing task. We may be able to reuse it.
  const existingCallbackPriority = root.callbackPriority;
  if (existingCallbackPriority === newCallbackPriority) {
    if (__DEV__) {
      // If we're going to re-use an existing task, it needs to exist.
      // Assume that discrete update microtasks are non-cancellable and null.
      // TODO: Temporary until we confirm this warning is not fired.
      if (
        existingCallbackNode == null &&
        existingCallbackPriority !== SyncLane
      ) {
        console.error(
          'Expected scheduled callback to exist. This error is likely caused by a bug in React. Please file an issue.',
        );
      }
    }
    // The priority hasn't changed. We can reuse the existing task. Exit.
    return;
  }

  if (existingCallbackNode != null) {
    // Cancel the existing callback. We'll schedule a new one below.
    cancelCallback(existingCallbackNode);
  }

  // Schedule a new callback.
  let newCallbackNode;
  if (newCallbackPriority === SyncLane) {
    // Special case: Sync React callbacks are scheduled on a special
    // internal queue
    if (root.tag === LegacyRoot) {
      scheduleLegacySyncCallback(performSyncWorkOnRoot.bind(null, root));
    } else {
      scheduleSyncCallback(performSyncWorkOnRoot.bind(null, root));
    }
    if (supportsMicrotasks) {
      // Flush the queue in a microtask.
      scheduleMicrotask(flushSyncCallbacks);
    } else {
      // Flush the queue in an Immediate task.
      scheduleCallback(ImmediateSchedulerPriority, flushSyncCallbacks);
    }
    newCallbackNode = null;
  } else {
    let schedulerPriorityLevel;
    switch (lanesToEventPriority(nextLanes)) {
      case DiscreteEventPriority:
        schedulerPriorityLevel = ImmediateSchedulerPriority;
        break;
      case ContinuousEventPriority:
        schedulerPriorityLevel = UserBlockingSchedulerPriority;
        break;
      case DefaultEventPriority:
        schedulerPriorityLevel = NormalSchedulerPriority;
        break;
      case IdleEventPriority:
        schedulerPriorityLevel = IdleSchedulerPriority;
        break;
      default:
        schedulerPriorityLevel = NormalSchedulerPriority;
        break;
    }
    newCallbackNode = scheduleCallback(
      schedulerPriorityLevel,
      performConcurrentWorkOnRoot.bind(null, root),
    );
  }

  root.callbackPriority = newCallbackPriority;
  root.callbackNode = newCallbackNode;
}

// This is the entry point for every concurrent task, i.e. anything that
// goes through Scheduler.
function performConcurrentWorkOnRoot(root, didTimeout) {
  if (enableProfilerTimer && enableProfilerNestedUpdatePhase) {
    resetNestedUpdateFlag();
  }

  // Since we know we're in a React event, we can clear the current
  // event time. The next update will compute a new event time.
  currentEventTime = NoTimestamp;
  currentEventTransitionLane = NoLanes;

  invariant(
    (executionContext & (RenderContext | CommitContext)) === NoContext,
    'Should not already be working.',
  );

  // Flush any pending passive effects before deciding which lanes to work on,
  // in case they schedule additional work.
  const originalCallbackNode = root.callbackNode;
  const didFlushPassiveEffects = flushPassiveEffects();
  if (didFlushPassiveEffects) {
    // Something in the passive effect phase may have canceled the current task.
    // Check if the task node for this root was changed.
    if (root.callbackNode !== originalCallbackNode) {
      // The current task was canceled. Exit. We don't need to call
      // `ensureRootIsScheduled` because the check above implies either that
      // there's a new task, or that there's no remaining work on this root.
      return null;
    } else {
      // Current task was not canceled. Continue.
    }
  }

  // Determine the next lanes to work on, using the fields stored
  // on the root.
  let lanes = getNextLanes(
    root,
    root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes,
  );
  if (lanes === NoLanes) {
    // Defensive coding. This is never expected to happen.
    return null;
  }

  // We disable time-slicing in some cases: if the work has been CPU-bound
  // for too long ("expired" work, to prevent starvation), or we're in
  // sync-updates-by-default mode.
  // TODO: We only check `didTimeout` defensively, to account for a Scheduler
  // bug we're still investigating. Once the bug in Scheduler is fixed,
  // we can remove this, since we track expiration ourselves.
  let exitStatus =
    shouldTimeSlice(root, lanes) &&
    (disableSchedulerTimeoutInWorkLoop || !didTimeout)
      ? renderRootConcurrent(root, lanes)
      : renderRootSync(root, lanes);
  if (exitStatus !== RootIncomplete) {
    if (exitStatus === RootErrored) {
      executionContext |= RetryAfterError;

      // If an error occurred during hydration,
      // discard server response and fall back to client side render.
      if (root.hydrate) {
        root.hydrate = false;
        if (__DEV__) {
          errorHydratingContainer(root.containerInfo);
        }
        clearContainer(root.containerInfo);
      }

      // If something threw an error, try rendering one more time. We'll render
      // synchronously to block concurrent data mutations, and we'll includes
      // all pending updates are included. If it still fails after the second
      // attempt, we'll give up and commit the resulting tree.
      const errorRetryLanes = getLanesToRetrySynchronouslyOnError(root);
      if (errorRetryLanes !== NoLanes) {
        lanes = errorRetryLanes;
        exitStatus = renderRootSync(root, errorRetryLanes);
      }
    }

    if (exitStatus === RootFatalErrored) {
      const fatalError = workInProgressRootFatalError;
      prepareFreshStack(root, NoLanes);
      markRootSuspended(root, lanes);
      ensureRootIsScheduled(root, now());
      throw fatalError;
    }

    // We now have a consistent tree. The next step is either to commit it,
    // or, if something suspended, wait to commit it after a timeout.
    const finishedWork: Fiber = (root.current.alternate: any);
    root.finishedWork = finishedWork;
    root.finishedLanes = lanes;
    finishConcurrentRender(root, exitStatus, lanes);
  }

  ensureRootIsScheduled(root, now());
  if (root.callbackNode === originalCallbackNode) {
    // The task node scheduled for this root is the same one that's
    // currently executed. Need to return a continuation.
    return performConcurrentWorkOnRoot.bind(null, root);
  }
  return null;
}

function finishConcurrentRender(root, exitStatus, lanes) {
  switch (exitStatus) {
    case RootIncomplete:
    case RootFatalErrored: {
      invariant(false, 'Root did not complete. This is a bug in React.');
    }
    // Flow knows about invariant, so it complains if I add a break
    // statement, but eslint doesn't know about invariant, so it complains
    // if I do. eslint-disable-next-line no-fallthrough
    case RootErrored: {
      // We should have already attempted to retry this tree. If we reached
      // this point, it errored again. Commit it.
      commitRoot(root);
      break;
    }
    case RootSuspended: {
      markRootSuspended(root, lanes);

      // We have an acceptable loading state. We need to figure out if we
      // should immediately commit it or wait a bit.

      if (
        includesOnlyRetries(lanes) &&
        // do not delay if we're inside an act() scope
        !shouldForceFlushFallbacksInDEV()
      ) {
        // This render only included retries, no updates. Throttle committing
        // retries so that we don't show too many loading states too quickly.
        const msUntilTimeout =
          globalMostRecentFallbackTime + FALLBACK_THROTTLE_MS - now();
        // Don't bother with a very short suspense time.
        if (msUntilTimeout > 10) {
          const nextLanes = getNextLanes(root, NoLanes);
          if (nextLanes !== NoLanes) {
            // There's additional work on this root.
            break;
          }
          const suspendedLanes = root.suspendedLanes;
          if (!isSubsetOfLanes(suspendedLanes, lanes)) {
            // We should prefer to render the fallback of at the last
            // suspended level. Ping the last suspended level to try
            // rendering it again.
            // FIXME: What if the suspended lanes are Idle? Should not restart.
            const eventTime = requestEventTime();
            markRootPinged(root, suspendedLanes, eventTime);
            break;
          }

          // The render is suspended, it hasn't timed out, and there's no
          // lower priority work to do. Instead of committing the fallback
          // immediately, wait for more data to arrive.
          root.timeoutHandle = scheduleTimeout(
            commitRoot.bind(null, root),
            msUntilTimeout,
          );
          break;
        }
      }
      // The work expired. Commit immediately.
      commitRoot(root);
      break;
    }
    case RootSuspendedWithDelay: {
      markRootSuspended(root, lanes);

      if (includesOnlyTransitions(lanes)) {
        // This is a transition, so we should exit without committing a
        // placeholder and without scheduling a timeout. Delay indefinitely
        // until we receive more data.
        break;
      }

      if (!shouldForceFlushFallbacksInDEV()) {
        // This is not a transition, but we did trigger an avoided state.
        // Schedule a placeholder to display after a short delay, using the Just
        // Noticeable Difference.
        // TODO: Is the JND optimization worth the added complexity? If this is
        // the only reason we track the event time, then probably not.
        // Consider removing.

        const mostRecentEventTime = getMostRecentEventTime(root, lanes);
        const eventTimeMs = mostRecentEventTime;
        const timeElapsedMs = now() - eventTimeMs;
        const msUntilTimeout = jnd(timeElapsedMs) - timeElapsedMs;

        // Don't bother with a very short suspense time.
        if (msUntilTimeout > 10) {
          // Instead of committing the fallback immediately, wait for more data
          // to arrive.
          root.timeoutHandle = scheduleTimeout(
            commitRoot.bind(null, root),
            msUntilTimeout,
          );
          break;
        }
      }

      // Commit the placeholder.
      commitRoot(root);
      break;
    }
    case RootCompleted: {
      // The work completed. Ready to commit.
      commitRoot(root);
      break;
    }
    default: {
      invariant(false, 'Unknown root exit status.');
    }
  }
}

function markRootSuspended(root, suspendedLanes) {
  // When suspending, we should always exclude lanes that were pinged or (more
  // rarely, since we try to avoid it) updated during the render phase.
  // TODO: Lol maybe there's a better way to factor this besides this
  // obnoxiously named function :)
  suspendedLanes = removeLanes(suspendedLanes, workInProgressRootPingedLanes);
  suspendedLanes = removeLanes(suspendedLanes, workInProgressRootUpdatedLanes);
  markRootSuspended_dontCallThisOneDirectly(root, suspendedLanes);
}

// This is the entry point for synchronous tasks that don't go
// through Scheduler
function performSyncWorkOnRoot(root) {
  if (enableProfilerTimer && enableProfilerNestedUpdatePhase) {
    syncNestedUpdateFlag();
  }

  invariant(
    (executionContext & (RenderContext | CommitContext)) === NoContext,
    'Should not already be working.',
  );

  flushPassiveEffects();

  let lanes = getNextLanes(root, NoLanes);
  if (!includesSomeLane(lanes, SyncLane)) {
    // There's no remaining sync work left.
    ensureRootIsScheduled(root, now());
    return null;
  }

  let exitStatus = renderRootSync(root, lanes);
  if (root.tag !== LegacyRoot && exitStatus === RootErrored) {
    executionContext |= RetryAfterError;

    // If an error occurred during hydration,
    // discard server response and fall back to client side render.
    if (root.hydrate) {
      root.hydrate = false;
      if (__DEV__) {
        errorHydratingContainer(root.containerInfo);
      }
      clearContainer(root.containerInfo);
    }

    // If something threw an error, try rendering one more time. We'll render
    // synchronously to block concurrent data mutations, and we'll includes
    // all pending updates are included. If it still fails after the second
    // attempt, we'll give up and commit the resulting tree.
    const errorRetryLanes = getLanesToRetrySynchronouslyOnError(root);
    if (errorRetryLanes !== NoLanes) {
      lanes = errorRetryLanes;
      exitStatus = renderRootSync(root, lanes);
    }
  }

  if (exitStatus === RootFatalErrored) {
    const fatalError = workInProgressRootFatalError;
    prepareFreshStack(root, NoLanes);
    markRootSuspended(root, lanes);
    ensureRootIsScheduled(root, now());
    throw fatalError;
  }

  // We now have a consistent tree. Because this is a sync render, we
  // will commit it even if something suspended.
  const finishedWork: Fiber = (root.current.alternate: any);
  root.finishedWork = finishedWork;
  root.finishedLanes = lanes;
  commitRoot(root);

  // Before exiting, make sure there's a callback scheduled for the next
  // pending level.
  ensureRootIsScheduled(root, now());

  return null;
}

export function flushRoot(root: FiberRoot, lanes: Lanes) {
  if (lanes !== NoLanes) {
    markRootEntangled(root, mergeLanes(lanes, SyncLane));
    ensureRootIsScheduled(root, now());
    if ((executionContext & (RenderContext | CommitContext)) === NoContext) {
      resetRenderTimer();
      flushSyncCallbacks();
    }
  }
}

export function getExecutionContext(): ExecutionContext {
  return executionContext;
}

export function flushDiscreteUpdates() {
  // TODO: Should be able to flush inside batchedUpdates, but not inside `act`.
  // However, `act` uses `batchedUpdates`, so there's no way to distinguish
  // those two cases. Need to fix this before exposing flushDiscreteUpdates
  // as a public API.
  if (
    (executionContext & (BatchedContext | RenderContext | CommitContext)) !==
    NoContext
  ) {
    if (__DEV__) {
      if ((executionContext & RenderContext) !== NoContext) {
        console.error(
          'unstable_flushDiscreteUpdates: Cannot flush updates when React is ' +
            'already rendering.',
        );
      }
    }
    // We're already rendering, so we can't synchronously flush pending work.
    // This is probably a nested event dispatch triggered by a lifecycle/effect,
    // like `el.focus()`. Exit.
    return;
  }
  flushSyncCallbacks();
  // If the discrete updates scheduled passive effects, flush them now so that
  // they fire before the next serial event.
  flushPassiveEffects();
}

export function deferredUpdates<A>(fn: () => A): A {
  const previousPriority = getCurrentUpdatePriority();
  const prevTransition = ReactCurrentBatchConfig.transition;
  try {
    ReactCurrentBatchConfig.transition = 0;
    setCurrentUpdatePriority(DefaultEventPriority);
    return fn();
  } finally {
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;
  }
}

export function batchedUpdates<A, R>(fn: A => R, a: A): R {
  const prevExecutionContext = executionContext;
  executionContext |= BatchedContext;
  try {
    return fn(a);
  } finally {
    executionContext = prevExecutionContext;
    // If there were legacy sync updates, flush them at the end of the outer
    // most batchedUpdates-like method.
    if (executionContext === NoContext) {
      resetRenderTimer();
      flushSyncCallbacksOnlyInLegacyMode();
    }
  }
}

export function batchedEventUpdates<A, R>(fn: A => R, a: A): R {
  const prevExecutionContext = executionContext;
  executionContext |= EventContext;
  try {
    return fn(a);
  } finally {
    executionContext = prevExecutionContext;
    // If there were legacy sync updates, flush them at the end of the outer
    // most batchedUpdates-like method.
    if (executionContext === NoContext) {
      resetRenderTimer();
      flushSyncCallbacksOnlyInLegacyMode();
    }
  }
}

export function discreteUpdates<A, B, C, D, R>(
  fn: (A, B, C, D) => R,
  a: A,
  b: B,
  c: C,
  d: D,
): R {
  const previousPriority = getCurrentUpdatePriority();
  const prevTransition = ReactCurrentBatchConfig.transition;
  try {
    ReactCurrentBatchConfig.transition = 0;
    setCurrentUpdatePriority(DiscreteEventPriority);
    return fn(a, b, c, d);
  } finally {
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;
    if (executionContext === NoContext) {
      resetRenderTimer();
    }
  }
}

export function unbatchedUpdates<A, R>(fn: (a: A) => R, a: A): R {
  const prevExecutionContext = executionContext;
  executionContext &= ~BatchedContext;
  executionContext |= LegacyUnbatchedContext;
  try {
    return fn(a);
  } finally {
    executionContext = prevExecutionContext;
    // If there were legacy sync updates, flush them at the end of the outer
    // most batchedUpdates-like method.
    if (executionContext === NoContext) {
      resetRenderTimer();
      // TODO: I think this call is redundant, because we flush inside
      // scheduleUpdateOnFiber when LegacyUnbatchedContext is set.
      flushSyncCallbacksOnlyInLegacyMode();
    }
  }
}

export function flushSync<A, R>(fn: A => R, a: A): R {
  const prevExecutionContext = executionContext;
  executionContext |= BatchedContext;

  const prevTransition = ReactCurrentBatchConfig.transition;
  const previousPriority = getCurrentUpdatePriority();
  try {
    ReactCurrentBatchConfig.transition = 0;
    setCurrentUpdatePriority(DiscreteEventPriority);
    if (fn) {
      return fn(a);
    } else {
      return (undefined: $FlowFixMe);
    }
  } finally {
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;
    executionContext = prevExecutionContext;
    // Flush the immediate callbacks that were scheduled during this batch.
    // Note that this will happen even if batchedUpdates is higher up
    // the stack.
    if ((executionContext & (RenderContext | CommitContext)) === NoContext) {
      flushSyncCallbacks();
    } else {
      if (__DEV__) {
        console.error(
          'flushSync was called from inside a lifecycle method. React cannot ' +
            'flush when React is already rendering. Consider moving this call to ' +
            'a scheduler task or micro task.',
        );
      }
    }
  }
}

export function flushControlled(fn: () => mixed): void {
  const prevExecutionContext = executionContext;
  executionContext |= BatchedContext;
  const prevTransition = ReactCurrentBatchConfig.transition;
  const previousPriority = getCurrentUpdatePriority();
  try {
    ReactCurrentBatchConfig.transition = 0;
    setCurrentUpdatePriority(DiscreteEventPriority);
    fn();
  } finally {
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;

    executionContext = prevExecutionContext;
    if (executionContext === NoContext) {
      // Flush the immediate callbacks that were scheduled during this batch
      resetRenderTimer();
      flushSyncCallbacks();
    }
  }
}

export function pushRenderLanes(fiber: Fiber, lanes: Lanes) {
  pushToStack(subtreeRenderLanesCursor, subtreeRenderLanes, fiber);
  subtreeRenderLanes = mergeLanes(subtreeRenderLanes, lanes);
  workInProgressRootIncludedLanes = mergeLanes(
    workInProgressRootIncludedLanes,
    lanes,
  );
}

export function popRenderLanes(fiber: Fiber) {
  subtreeRenderLanes = subtreeRenderLanesCursor.current;
  popFromStack(subtreeRenderLanesCursor, fiber);
}

function prepareFreshStack(root: FiberRoot, lanes: Lanes) {
  root.finishedWork = null;
  root.finishedLanes = NoLanes;

  const timeoutHandle = root.timeoutHandle;
  if (timeoutHandle !== noTimeout) {
    // The root previous suspended and scheduled a timeout to commit a fallback
    // state. Now that we have additional work, cancel the timeout.
    root.timeoutHandle = noTimeout;
    // $FlowFixMe Complains noTimeout is not a TimeoutID, despite the check above
    cancelTimeout(timeoutHandle);
  }

  if (workInProgress !== null) {
    let interruptedWork = workInProgress.return;
    while (interruptedWork !== null) {
      unwindInterruptedWork(interruptedWork, workInProgressRootRenderLanes);
      interruptedWork = interruptedWork.return;
    }
  }
  workInProgressRoot = root;
  workInProgress = createWorkInProgress(root.current, null);
  workInProgressRootRenderLanes = subtreeRenderLanes = workInProgressRootIncludedLanes = lanes;
  workInProgressRootExitStatus = RootIncomplete;
  workInProgressRootFatalError = null;
  workInProgressRootSkippedLanes = NoLanes;
  workInProgressRootUpdatedLanes = NoLanes;
  workInProgressRootPingedLanes = NoLanes;

  enqueueInterleavedUpdates();

  if (__DEV__) {
    ReactStrictModeWarnings.discardPendingWarnings();
  }
}

function handleError(root, thrownValue): void {
  do {
    let erroredWork = workInProgress;
    try {
      // Reset module-level state that was set during the render phase.
      resetContextDependencies();
      resetHooksAfterThrow();
      resetCurrentDebugFiberInDEV();
      // TODO: I found and added this missing line while investigating a
      // separate issue. Write a regression test using string refs.
      ReactCurrentOwner.current = null;

      if (erroredWork === null || erroredWork.return === null) {
        // Expected to be working on a non-root fiber. This is a fatal error
        // because there's no ancestor that can handle it; the root is
        // supposed to capture all errors that weren't caught by an error
        // boundary.
        workInProgressRootExitStatus = RootFatalErrored;
        workInProgressRootFatalError = thrownValue;
        // Set `workInProgress` to null. This represents advancing to the next
        // sibling, or the parent if there are no siblings. But since the root
        // has no siblings nor a parent, we set it to null. Usually this is
        // handled by `completeUnitOfWork` or `unwindWork`, but since we're
        // intentionally not calling those, we need set it here.
        // TODO: Consider calling `unwindWork` to pop the contexts.
        workInProgress = null;
        return;
      }

      if (enableProfilerTimer && erroredWork.mode & ProfileMode) {
        // Record the time spent rendering before an error was thrown. This
        // avoids inaccurate Profiler durations in the case of a
        // suspended render.
        stopProfilerTimerIfRunningAndRecordDelta(erroredWork, true);
      }

      throwException(
        root,
        erroredWork.return,
        erroredWork,
        thrownValue,
        workInProgressRootRenderLanes,
      );
      completeUnitOfWork(erroredWork);
    } catch (yetAnotherThrownValue) {
      // Something in the return path also threw.
      thrownValue = yetAnotherThrownValue;
      if (workInProgress === erroredWork && erroredWork !== null) {
        // If this boundary has already errored, then we had trouble processing
        // the error. Bubble it to the next boundary.
        erroredWork = erroredWork.return;
        workInProgress = erroredWork;
      } else {
        erroredWork = workInProgress;
      }
      continue;
    }
    // Return to the normal work loop.
    return;
  } while (true);
}

function pushDispatcher() {
  const prevDispatcher = ReactCurrentDispatcher.current;
  ReactCurrentDispatcher.current = ContextOnlyDispatcher;
  if (prevDispatcher === null) {
    // The React isomorphic package does not include a default dispatcher.
    // Instead the first renderer will lazily attach one, in order to give
    // nicer error messages.
    return ContextOnlyDispatcher;
  } else {
    return prevDispatcher;
  }
}

function popDispatcher(prevDispatcher) {
  ReactCurrentDispatcher.current = prevDispatcher;
}

export function markCommitTimeOfFallback() {
  globalMostRecentFallbackTime = now();
}

export function markSkippedUpdateLanes(lane: Lane | Lanes): void {
  workInProgressRootSkippedLanes = mergeLanes(
    lane,
    workInProgressRootSkippedLanes,
  );
}

export function renderDidSuspend(): void {
  if (workInProgressRootExitStatus === RootIncomplete) {
    workInProgressRootExitStatus = RootSuspended;
  }
}

export function renderDidSuspendDelayIfPossible(): void {
  if (
    workInProgressRootExitStatus === RootIncomplete ||
    workInProgressRootExitStatus === RootSuspended
  ) {
    workInProgressRootExitStatus = RootSuspendedWithDelay;
  }

  // Check if there are updates that we skipped tree that might have unblocked
  // this render.
  if (
    workInProgressRoot !== null &&
    (includesNonIdleWork(workInProgressRootSkippedLanes) ||
      includesNonIdleWork(workInProgressRootUpdatedLanes))
  ) {
    // Mark the current render as suspended so that we switch to working on
    // the updates that were skipped. Usually we only suspend at the end of
    // the render phase.
    // TODO: We should probably always mark the root as suspended immediately
    // (inside this function), since by suspending at the end of the render
    // phase introduces a potential mistake where we suspend lanes that were
    // pinged or updated while we were rendering.
    markRootSuspended(workInProgressRoot, workInProgressRootRenderLanes);
  }
}

export function renderDidError() {
  if (workInProgressRootExitStatus !== RootCompleted) {
    workInProgressRootExitStatus = RootErrored;
  }
}

// Called during render to determine if anything has suspended.
// Returns false if we're not sure.
export function renderHasNotSuspendedYet(): boolean {
  // If something errored or completed, we can't really be sure,
  // so those are false.
  return workInProgressRootExitStatus === RootIncomplete;
}

function renderRootSync(root: FiberRoot, lanes: Lanes) {
  const prevExecutionContext = executionContext;
  executionContext |= RenderContext;
  const prevDispatcher = pushDispatcher();

  // If the root or lanes have changed, throw out the existing stack
  // and prepare a fresh one. Otherwise we'll continue where we left off.
  if (workInProgressRoot !== root || workInProgressRootRenderLanes !== lanes) {
    if (enableUpdaterTracking) {
      if (isDevToolsPresent) {
        const memoizedUpdaters = root.memoizedUpdaters;
        if (memoizedUpdaters.size > 0) {
          restorePendingUpdaters(root, workInProgressRootRenderLanes);
          memoizedUpdaters.clear();
        }

        // At this point, move Fibers that scheduled the upcoming work from the Map to the Set.
        // If we bailout on this work, we'll move them back (like above).
        // It's important to move them now in case the work spawns more work at the same priority with different updaters.
        // That way we can keep the current update and future updates separate.
        movePendingFibersToMemoized(root, lanes);
      }
    }

    prepareFreshStack(root, lanes);
  }

  if (__DEV__) {
    if (enableDebugTracing) {
      logRenderStarted(lanes);
    }
  }

  if (enableSchedulingProfiler) {
    markRenderStarted(lanes);
  }

  do {
    try {
      workLoopSync();
      break;
    } catch (thrownValue) {
      handleError(root, thrownValue);
    }
  } while (true);
  resetContextDependencies();

  executionContext = prevExecutionContext;
  popDispatcher(prevDispatcher);

  if (workInProgress !== null) {
    // This is a sync render, so we should have finished the whole tree.
    invariant(
      false,
      'Cannot commit an incomplete root. This error is likely caused by a ' +
        'bug in React. Please file an issue.',
    );
  }

  if (__DEV__) {
    if (enableDebugTracing) {
      logRenderStopped();
    }
  }

  if (enableSchedulingProfiler) {
    markRenderStopped();
  }

  // Set this to null to indicate there's no in-progress render.
  workInProgressRoot = null;
  workInProgressRootRenderLanes = NoLanes;

  return workInProgressRootExitStatus;
}

// The work loop is an extremely hot path. Tell Closure not to inline it.
/** @noinline */
function workLoopSync() {
  // Already timed out, so perform work without checking if we need to yield.
  while (workInProgress !== null) {
    performUnitOfWork(workInProgress);
  }
}

function renderRootConcurrent(root: FiberRoot, lanes: Lanes) {
  const prevExecutionContext = executionContext;
  executionContext |= RenderContext;
  const prevDispatcher = pushDispatcher();

  // If the root or lanes have changed, throw out the existing stack
  // and prepare a fresh one. Otherwise we'll continue where we left off.
  if (workInProgressRoot !== root || workInProgressRootRenderLanes !== lanes) {
    if (enableUpdaterTracking) {
      if (isDevToolsPresent) {
        const memoizedUpdaters = root.memoizedUpdaters;
        if (memoizedUpdaters.size > 0) {
          restorePendingUpdaters(root, workInProgressRootRenderLanes);
          memoizedUpdaters.clear();
        }

        // At this point, move Fibers that scheduled the upcoming work from the Map to the Set.
        // If we bailout on this work, we'll move them back (like above).
        // It's important to move them now in case the work spawns more work at the same priority with different updaters.
        // That way we can keep the current update and future updates separate.
        movePendingFibersToMemoized(root, lanes);
      }
    }

    resetRenderTimer();
    prepareFreshStack(root, lanes);
  }

  if (__DEV__) {
    if (enableDebugTracing) {
      logRenderStarted(lanes);
    }
  }

  if (enableSchedulingProfiler) {
    markRenderStarted(lanes);
  }

  do {
    try {
      workLoopConcurrent();
      break;
    } catch (thrownValue) {
      handleError(root, thrownValue);
    }
  } while (true);
  resetContextDependencies();

  popDispatcher(prevDispatcher);
  executionContext = prevExecutionContext;

  if (__DEV__) {
    if (enableDebugTracing) {
      logRenderStopped();
    }
  }

  // Check if the tree has completed.
  if (workInProgress !== null) {
    // Still work remaining.
    if (enableSchedulingProfiler) {
      markRenderYielded();
    }
    return RootIncomplete;
  } else {
    // Completed the tree.
    if (enableSchedulingProfiler) {
      markRenderStopped();
    }

    // Set this to null to indicate there's no in-progress render.
    workInProgressRoot = null;
    workInProgressRootRenderLanes = NoLanes;

    // Return the final exit status.
    return workInProgressRootExitStatus;
  }
}

/** @noinline */
function workLoopConcurrent() {
  // Perform work until Scheduler asks us to yield
  while (workInProgress !== null && !shouldYield()) {
    performUnitOfWork(workInProgress);
  }
}

function performUnitOfWork(unitOfWork: Fiber): void {
  // The current, flushed, state of this fiber is the alternate. Ideally
  // nothing should rely on this, but relying on it here means that we don't
  // need an additional field on the work in progress.
  const current = unitOfWork.alternate;
  setCurrentDebugFiberInDEV(unitOfWork);

  let next;
  if (enableProfilerTimer && (unitOfWork.mode & ProfileMode) !== NoMode) {
    startProfilerTimer(unitOfWork);
    next = beginWork(current, unitOfWork, subtreeRenderLanes);
    stopProfilerTimerIfRunningAndRecordDelta(unitOfWork, true);
  } else {
    next = beginWork(current, unitOfWork, subtreeRenderLanes);
  }

  resetCurrentDebugFiberInDEV();
  unitOfWork.memoizedProps = unitOfWork.pendingProps;
  if (next === null) {
    // If this doesn't spawn new work, complete the current work.
    completeUnitOfWork(unitOfWork);
  } else {
    workInProgress = next;
  }

  ReactCurrentOwner.current = null;
}

function completeUnitOfWork(unitOfWork: Fiber): void {
  // Attempt to complete the current unit of work, then move to the next
  // sibling. If there are no more siblings, return to the parent fiber.
  let completedWork = unitOfWork;
  do {
    // The current, flushed, state of this fiber is the alternate. Ideally
    // nothing should rely on this, but relying on it here means that we don't
    // need an additional field on the work in progress.
    const current = completedWork.alternate;
    const returnFiber = completedWork.return;

    // Check if the work completed or if something threw.
    if ((completedWork.flags & Incomplete) === NoFlags) {
      setCurrentDebugFiberInDEV(completedWork);
      let next;
      if (
        !enableProfilerTimer ||
        (completedWork.mode & ProfileMode) === NoMode
      ) {
        next = completeWork(current, completedWork, subtreeRenderLanes);
      } else {
        startProfilerTimer(completedWork);
        next = completeWork(current, completedWork, subtreeRenderLanes);
        // Update render duration assuming we didn't error.
        stopProfilerTimerIfRunningAndRecordDelta(completedWork, false);
      }
      resetCurrentDebugFiberInDEV();

      if (next !== null) {
        // Completing this fiber spawned new work. Work on that next.
        workInProgress = next;
        return;
      }
    } else {
      // This fiber did not complete because something threw. Pop values off
      // the stack without entering the complete phase. If this is a boundary,
      // capture values if possible.
      const next = unwindWork(completedWork, subtreeRenderLanes);

      // Because this fiber did not complete, don't reset its lanes.

      if (next !== null) {
        // If completing this work spawned new work, do that next. We'll come
        // back here again.
        // Since we're restarting, remove anything that is not a host effect
        // from the effect tag.
        next.flags &= HostEffectMask;
        workInProgress = next;
        return;
      }

      if (
        enableProfilerTimer &&
        (completedWork.mode & ProfileMode) !== NoMode
      ) {
        // Record the render duration for the fiber that errored.
        stopProfilerTimerIfRunningAndRecordDelta(completedWork, false);

        // Include the time spent working on failed children before continuing.
        let actualDuration = completedWork.actualDuration;
        let child = completedWork.child;
        while (child !== null) {
          actualDuration += child.actualDuration;
          child = child.sibling;
        }
        completedWork.actualDuration = actualDuration;
      }

      if (returnFiber !== null) {
        // Mark the parent fiber as incomplete and clear its subtree flags.
        returnFiber.flags |= Incomplete;
        returnFiber.subtreeFlags = NoFlags;
        returnFiber.deletions = null;
      }
    }

    const siblingFiber = completedWork.sibling;
    if (siblingFiber !== null) {
      // If there is more work to do in this returnFiber, do that next.
      workInProgress = siblingFiber;
      return;
    }
    // Otherwise, return to the parent
    completedWork = returnFiber;
    // Update the next thing we're working on in case something throws.
    workInProgress = completedWork;
  } while (completedWork !== null);

  // We've reached the root.
  if (workInProgressRootExitStatus === RootIncomplete) {
    workInProgressRootExitStatus = RootCompleted;
  }
}

function commitRoot(root) {
  // TODO: This no longer makes any sense. We already wrap the mutation and
  // layout phases. Should be able to remove.
  const previousUpdateLanePriority = getCurrentUpdatePriority();
  const prevTransition = ReactCurrentBatchConfig.transition;
  try {
    ReactCurrentBatchConfig.transition = 0;
    setCurrentUpdatePriority(DiscreteEventPriority);
    commitRootImpl(root, previousUpdateLanePriority);
  } finally {
    ReactCurrentBatchConfig.transition = prevTransition;
    setCurrentUpdatePriority(previousUpdateLanePriority);
  }

  return null;
}

function commitRootImpl(root, renderPriorityLevel) {
  do {
    // `flushPassiveEffects` will call `flushSyncUpdateQueue` at the end, which
    // means `flushPassiveEffects` will sometimes result in additional
    // passive effects. So we need to keep flushing in a loop until there are
    // no more pending effects.
    // TODO: Might be better if `flushPassiveEffects` did not automatically
    // flush synchronous work at the end, to avoid factoring hazards like this.
    flushPassiveEffects();
  } while (rootWithPendingPassiveEffects !== null);
  flushRenderPhaseStrictModeWarningsInDEV();

  invariant(
    (executionContext & (RenderContext | CommitContext)) === NoContext,
    'Should not already be working.',
  );

  const finishedWork = root.finishedWork;
  const lanes = root.finishedLanes;

  if (__DEV__) {
    if (enableDebugTracing) {
      logCommitStarted(lanes);
    }
  }

  if (enableSchedulingProfiler) {
    markCommitStarted(lanes);
  }

  if (finishedWork === null) {
    if (__DEV__) {
      if (enableDebugTracing) {
        logCommitStopped();
      }
    }

    if (enableSchedulingProfiler) {
      markCommitStopped();
    }

    return null;
  } else {
    if (__DEV__) {
      if (lanes === NoLanes) {
        console.error(
          'root.finishedLanes should not be empty during a commit. This is a ' +
            'bug in React.',
        );
      }
    }
  }
  root.finishedWork = null;
  root.finishedLanes = NoLanes;

  invariant(
    finishedWork !== root.current,
    'Cannot commit the same tree as before. This error is likely caused by ' +
      'a bug in React. Please file an issue.',
  );

  // commitRoot never returns a continuation; it always finishes synchronously.
  // So we can clear these now to allow a new callback to be scheduled.
  root.callbackNode = null;
  root.callbackPriority = NoLane;

  // Update the first and last pending times on this root. The new first
  // pending time is whatever is left on the root fiber.
  let remainingLanes = mergeLanes(finishedWork.lanes, finishedWork.childLanes);
  markRootFinished(root, remainingLanes);

  if (root === workInProgressRoot) {
    // We can reset these now that they are finished.
    workInProgressRoot = null;
    workInProgress = null;
    workInProgressRootRenderLanes = NoLanes;
  } else {
    // This indicates that the last root we worked on is not the same one that
    // we're committing now. This most commonly happens when a suspended root
    // times out.
  }

  // If there are pending passive effects, schedule a callback to process them.
  // Do this as early as possible, so it is queued before anything else that
  // might get scheduled in the commit phase. (See #16714.)
  // TODO: Delete all other places that schedule the passive effect callback
  // They're redundant.
  if (
    (finishedWork.subtreeFlags & PassiveMask) !== NoFlags ||
    (finishedWork.flags & PassiveMask) !== NoFlags
  ) {
    if (!rootDoesHavePassiveEffects) {
      rootDoesHavePassiveEffects = true;
      scheduleCallback(NormalSchedulerPriority, () => {
        flushPassiveEffects();
        return null;
      });
    }
  }

  // Check if there are any effects in the whole tree.
  // TODO: This is left over from the effect list implementation, where we had
  // to check for the existence of `firstEffect` to satisfy Flow. I think the
  // only other reason this optimization exists is because it affects profiling.
  // Reconsider whether this is necessary.
  const subtreeHasEffects =
    (finishedWork.subtreeFlags &
      (BeforeMutationMask | MutationMask | LayoutMask | PassiveMask)) !==
    NoFlags;
  const rootHasEffect =
    (finishedWork.flags &
      (BeforeMutationMask | MutationMask | LayoutMask | PassiveMask)) !==
    NoFlags;

  if (subtreeHasEffects || rootHasEffect) {
    const prevTransition = ReactCurrentBatchConfig.transition;
    ReactCurrentBatchConfig.transition = 0;
    const previousPriority = getCurrentUpdatePriority();
    setCurrentUpdatePriority(DiscreteEventPriority);

    const prevExecutionContext = executionContext;
    executionContext |= CommitContext;

    // Reset this to null before calling lifecycles
    ReactCurrentOwner.current = null;

    // The commit phase is broken into several sub-phases. We do a separate pass
    // of the effect list for each phase: all mutation effects come before all
    // layout effects, and so on.

    // The first phase a "before mutation" phase. We use this phase to read the
    // state of the host tree right before we mutate it. This is where
    // getSnapshotBeforeUpdate is called.
    const shouldFireAfterActiveInstanceBlur = commitBeforeMutationEffects(
      root,
      finishedWork,
    );

    if (enableProfilerTimer) {
      // Mark the current commit time to be shared by all Profilers in this
      // batch. This enables them to be grouped later.
      recordCommitTime();
    }

    if (enableProfilerTimer && enableProfilerNestedUpdateScheduledHook) {
      // Track the root here, rather than in commitLayoutEffects(), because of ref setters.
      // Updates scheduled during ref detachment should also be flagged.
      rootCommittingMutationOrLayoutEffects = root;
    }

    // The next phase is the mutation phase, where we mutate the host tree.
    commitMutationEffects(root, finishedWork, lanes);

    if (shouldFireAfterActiveInstanceBlur) {
      afterActiveInstanceBlur();
    }
    resetAfterCommit(root.containerInfo);

    // 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;

    // The next phase is the layout phase, where we call effects that read
    // the host tree after it's been mutated. The idiomatic use case for this is
    // layout, but class component lifecycles also fire here for legacy reasons.
    if (__DEV__) {
      if (enableDebugTracing) {
        logLayoutEffectsStarted(lanes);
      }
    }
    if (enableSchedulingProfiler) {
      markLayoutEffectsStarted(lanes);
    }
    commitLayoutEffects(finishedWork, root, lanes);
    if (__DEV__) {
      if (enableDebugTracing) {
        logLayoutEffectsStopped();
      }
    }

    if (enableSchedulingProfiler) {
      markLayoutEffectsStopped();
    }

    if (enableProfilerTimer && enableProfilerNestedUpdateScheduledHook) {
      rootCommittingMutationOrLayoutEffects = null;
    }

    // Tell Scheduler to yield at the end of the frame, so the browser has an
    // opportunity to paint.
    requestPaint();

    executionContext = prevExecutionContext;

    // Reset the priority to the previous non-sync value.
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;
  } else {
    // No effects.
    root.current = finishedWork;
    // Measure these anyway so the flamegraph explicitly shows that there were
    // no effects.
    // TODO: Maybe there's a better way to report this.
    if (enableProfilerTimer) {
      recordCommitTime();
    }
  }

  const rootDidHavePassiveEffects = rootDoesHavePassiveEffects;

  if (rootDoesHavePassiveEffects) {
    // This commit has passive effects. Stash a reference to them. But don't
    // schedule a callback until after flushing layout work.
    rootDoesHavePassiveEffects = false;
    rootWithPendingPassiveEffects = root;
    pendingPassiveEffectsLanes = lanes;
  }

  // Read this again, since an effect might have updated it
  remainingLanes = root.pendingLanes;

  // Check if there's remaining work on this root
  if (remainingLanes === NoLanes) {
    // If there's no remaining work, we can clear the set of already failed
    // error boundaries.
    legacyErrorBoundariesThatAlreadyFailed = null;
  }

  if (__DEV__ && enableStrictEffects) {
    if (!rootDidHavePassiveEffects) {
      commitDoubleInvokeEffectsInDEV(root.current, false);
    }
  }

  if (includesSomeLane(remainingLanes, (SyncLane: Lane))) {
    if (enableProfilerTimer && enableProfilerNestedUpdatePhase) {
      markNestedUpdateScheduled();
    }

    // Count the number of times the root synchronously re-renders without
    // finishing. If there are too many, it indicates an infinite update loop.
    if (root === rootWithNestedUpdates) {
      nestedUpdateCount++;
    } else {
      nestedUpdateCount = 0;
      rootWithNestedUpdates = root;
    }
  } else {
    nestedUpdateCount = 0;
  }

  onCommitRootDevTools(finishedWork.stateNode, renderPriorityLevel);

  if (enableUpdaterTracking) {
    if (isDevToolsPresent) {
      root.memoizedUpdaters.clear();
    }
  }

  if (__DEV__) {
    onCommitRootTestSelector();
  }

  // Always call this before exiting `commitRoot`, to ensure that any
  // additional work on this root is scheduled.
  ensureRootIsScheduled(root, now());

  if (hasUncaughtError) {
    hasUncaughtError = false;
    const error = firstUncaughtError;
    firstUncaughtError = null;
    throw error;
  }

  if ((executionContext & LegacyUnbatchedContext) !== NoContext) {
    if (__DEV__) {
      if (enableDebugTracing) {
        logCommitStopped();
      }
    }

    if (enableSchedulingProfiler) {
      markCommitStopped();
    }

    // This is a legacy edge case. We just committed the initial mount of
    // a ReactDOM.render-ed root inside of batchedUpdates. The commit fired
    // synchronously, but layout updates should be deferred until the end
    // of the batch.
    return null;
  }

  // If the passive effects are the result of a discrete render, flush them
  // synchronously at the end of the current task so that the result is
  // immediately observable. Otherwise, we assume that they are not
  // order-dependent and do not need to be observed by external systems, so we
  // can wait until after paint.
  // TODO: We can optimize this by not scheduling the callback earlier. Since we
  // currently schedule the callback in multiple places, will wait until those
  // are consolidated.
  if (
    includesSomeLane(pendingPassiveEffectsLanes, SyncLane) &&
    root.tag !== LegacyRoot
  ) {
    flushPassiveEffects();
  }

  // If layout work was scheduled, flush it now.
  flushSyncCallbacks();

  if (__DEV__) {
    if (enableDebugTracing) {
      logCommitStopped();
    }
  }

  if (enableSchedulingProfiler) {
    markCommitStopped();
  }

  return null;
}

export function flushPassiveEffects(): boolean {
  // Returns whether passive effects were flushed.
  // TODO: Combine this check with the one in flushPassiveEFfectsImpl. We should
  // probably just combine the two functions. I believe they were only separate
  // in the first place because we used to wrap it with
  // `Scheduler.runWithPriority`, which accepts a function. But now we track the
  // priority within React itself, so we can mutate the variable directly.
  if (rootWithPendingPassiveEffects !== null) {
    const renderPriority = lanesToEventPriority(pendingPassiveEffectsLanes);
    const priority = lowerEventPriority(DefaultEventPriority, renderPriority);
    const prevTransition = ReactCurrentBatchConfig.transition;
    const previousPriority = getCurrentUpdatePriority();
    try {
      ReactCurrentBatchConfig.transition = 0;
      setCurrentUpdatePriority(priority);
      return flushPassiveEffectsImpl();
    } finally {
      setCurrentUpdatePriority(previousPriority);
      ReactCurrentBatchConfig.transition = prevTransition;
    }
  }
  return false;
}

export function enqueuePendingPassiveProfilerEffect(fiber: Fiber): void {
  if (enableProfilerTimer && enableProfilerCommitHooks) {
    pendingPassiveProfilerEffects.push(fiber);
    if (!rootDoesHavePassiveEffects) {
      rootDoesHavePassiveEffects = true;
      scheduleCallback(NormalSchedulerPriority, () => {
        flushPassiveEffects();
        return null;
      });
    }
  }
}

function flushPassiveEffectsImpl() {
  if (rootWithPendingPassiveEffects === null) {
    return false;
  }

  const root = rootWithPendingPassiveEffects;
  const lanes = pendingPassiveEffectsLanes;
  rootWithPendingPassiveEffects = null;
  // TODO: This is sometimes out of sync with rootWithPendingPassiveEffects.
  // 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.
  pendingPassiveEffectsLanes = NoLanes;

  invariant(
    (executionContext & (RenderContext | CommitContext)) === NoContext,
    'Cannot flush passive effects while already rendering.',
  );

  if (__DEV__) {
    if (enableDebugTracing) {
      logPassiveEffectsStarted(lanes);
    }
  }

  if (enableSchedulingProfiler) {
    markPassiveEffectsStarted(lanes);
  }

  if (__DEV__) {
    isFlushingPassiveEffects = true;
  }

  const prevExecutionContext = executionContext;
  executionContext |= CommitContext;

  commitPassiveUnmountEffects(root.current);
  commitPassiveMountEffects(root, root.current);

  // TODO: Move to commitPassiveMountEffects
  if (enableProfilerTimer && enableProfilerCommitHooks) {
    const profilerEffects = pendingPassiveProfilerEffects;
    pendingPassiveProfilerEffects = [];
    for (let i = 0; i < profilerEffects.length; i++) {
      const fiber = ((profilerEffects[i]: any): Fiber);
      commitPassiveEffectDurations(root, fiber);
    }
  }

  if (__DEV__) {
    isFlushingPassiveEffects = false;
  }

  if (__DEV__) {
    if (enableDebugTracing) {
      logPassiveEffectsStopped();
    }
  }

  if (enableSchedulingProfiler) {
    markPassiveEffectsStopped();
  }

  if (__DEV__ && enableStrictEffects) {
    commitDoubleInvokeEffectsInDEV(root.current, true);
  }

  executionContext = prevExecutionContext;

  flushSyncCallbacks();

  // If additional passive effects were scheduled, increment a counter. If this
  // exceeds the limit, we'll fire a warning.
  nestedPassiveUpdateCount =
    rootWithPendingPassiveEffects === null ? 0 : nestedPassiveUpdateCount + 1;

  // TODO: Move to commitPassiveMountEffects
  onPostCommitRootDevTools(root);
  if (enableProfilerTimer && enableProfilerCommitHooks) {
    const stateNode = root.current.stateNode;
    stateNode.effectDuration = 0;
    stateNode.passiveEffectDuration = 0;
  }

  return true;
}

export function isAlreadyFailedLegacyErrorBoundary(instance: mixed): boolean {
  return (
    legacyErrorBoundariesThatAlreadyFailed !== null &&
    legacyErrorBoundariesThatAlreadyFailed.has(instance)
  );
}

export function markLegacyErrorBoundaryAsFailed(instance: mixed) {
  if (legacyErrorBoundariesThatAlreadyFailed === null) {
    legacyErrorBoundariesThatAlreadyFailed = new Set([instance]);
  } else {
    legacyErrorBoundariesThatAlreadyFailed.add(instance);
  }
}

function prepareToThrowUncaughtError(error: mixed) {
  if (!hasUncaughtError) {
    hasUncaughtError = true;
    firstUncaughtError = error;
  }
}
export const onUncaughtError = prepareToThrowUncaughtError;

function captureCommitPhaseErrorOnRoot(
  rootFiber: Fiber,
  sourceFiber: Fiber,
  error: mixed,
) {
  const errorInfo = createCapturedValue(error, sourceFiber);
  const update = createRootErrorUpdate(rootFiber, errorInfo, (SyncLane: Lane));
  enqueueUpdate(rootFiber, update, (SyncLane: Lane));
  const eventTime = requestEventTime();
  const root = markUpdateLaneFromFiberToRoot(rootFiber, (SyncLane: Lane));
  if (root !== null) {
    markRootUpdated(root, SyncLane, eventTime);
    ensureRootIsScheduled(root, eventTime);
  }
}

export function captureCommitPhaseError(
  sourceFiber: Fiber,
  nearestMountedAncestor: Fiber | null,
  error: mixed,
) {
  if (sourceFiber.tag === HostRoot) {
    // Error was thrown at the root. There is no parent, so the root
    // itself should capture it.
    captureCommitPhaseErrorOnRoot(sourceFiber, sourceFiber, error);
    return;
  }

  let fiber = null;
  if (skipUnmountedBoundaries) {
    fiber = nearestMountedAncestor;
  } else {
    fiber = sourceFiber.return;
  }

  while (fiber !== null) {
    if (fiber.tag === HostRoot) {
      captureCommitPhaseErrorOnRoot(fiber, sourceFiber, error);
      return;
    } else if (fiber.tag === ClassComponent) {
      const ctor = fiber.type;
      const instance = fiber.stateNode;
      if (
        typeof ctor.getDerivedStateFromError === 'function' ||
        (typeof instance.componentDidCatch === 'function' &&
          !isAlreadyFailedLegacyErrorBoundary(instance))
      ) {
        const errorInfo = createCapturedValue(error, sourceFiber);
        const update = createClassErrorUpdate(
          fiber,
          errorInfo,
          (SyncLane: Lane),
        );
        enqueueUpdate(fiber, update, (SyncLane: Lane));
        const eventTime = requestEventTime();
        const root = markUpdateLaneFromFiberToRoot(fiber, (SyncLane: Lane));
        if (root !== null) {
          markRootUpdated(root, SyncLane, eventTime);
          ensureRootIsScheduled(root, eventTime);
        }
        return;
      }
    }
    fiber = fiber.return;
  }

  if (__DEV__) {
    // TODO: Until we re-land skipUnmountedBoundaries (see #20147), this warning
    // will fire for errors that are thrown by destroy functions inside deleted
    // trees. What it should instead do is propagate the error to the parent of
    // the deleted tree. In the meantime, do not add this warning to the
    // allowlist; this is only for our internal use.
    console.error(
      'Internal React error: Attempted to capture a commit phase error ' +
        'inside a detached tree. This indicates a bug in React. Likely ' +
        'causes include deleting the same fiber more than once, committing an ' +
        'already-finished tree, or an inconsistent return pointer.\n\n' +
        'Error message:\n\n%s',
      error,
    );
  }
}

export function pingSuspendedRoot(
  root: FiberRoot,
  wakeable: Wakeable,
  pingedLanes: Lanes,
) {
  const pingCache = root.pingCache;
  if (pingCache !== null) {
    // The wakeable resolved, so we no longer need to memoize, because it will
    // never be thrown again.
    pingCache.delete(wakeable);
  }

  const eventTime = requestEventTime();
  markRootPinged(root, pingedLanes, eventTime);

  if (
    workInProgressRoot === root &&
    isSubsetOfLanes(workInProgressRootRenderLanes, pingedLanes)
  ) {
    // Received a ping at the same priority level at which we're currently
    // rendering. We might want to restart this render. This should mirror
    // the logic of whether or not a root suspends once it completes.

    // TODO: If we're rendering sync either due to Sync, Batched or expired,
    // we should probably never restart.

    // If we're suspended with delay, or if it's a retry, we'll always suspend
    // so we can always restart.
    if (
      workInProgressRootExitStatus === RootSuspendedWithDelay ||
      (workInProgressRootExitStatus === RootSuspended &&
        includesOnlyRetries(workInProgressRootRenderLanes) &&
        now() - globalMostRecentFallbackTime < FALLBACK_THROTTLE_MS)
    ) {
      // Restart from the root.
      prepareFreshStack(root, NoLanes);
    } else {
      // Even though we can't restart right now, we might get an
      // opportunity later. So we mark this render as having a ping.
      workInProgressRootPingedLanes = mergeLanes(
        workInProgressRootPingedLanes,
        pingedLanes,
      );
    }
  }

  ensureRootIsScheduled(root, eventTime);
}

function retryTimedOutBoundary(boundaryFiber: Fiber, retryLane: Lane) {
  // The boundary fiber (a Suspense component or SuspenseList component)
  // previously was rendered in its fallback state. One of the promises that
  // suspended it has resolved, which means at least part of the tree was
  // likely unblocked. Try rendering again, at a new lanes.
  if (retryLane === NoLane) {
    // TODO: Assign this to `suspenseState.retryLane`? to avoid
    // unnecessary entanglement?
    retryLane = requestRetryLane(boundaryFiber);
  }
  // TODO: Special case idle priority?
  const eventTime = requestEventTime();
  const root = markUpdateLaneFromFiberToRoot(boundaryFiber, retryLane);
  if (root !== null) {
    markRootUpdated(root, retryLane, eventTime);
    ensureRootIsScheduled(root, eventTime);
  }
}

export function retryDehydratedSuspenseBoundary(boundaryFiber: Fiber) {
  const suspenseState: null | SuspenseState = boundaryFiber.memoizedState;
  let retryLane = NoLane;
  if (suspenseState !== null) {
    retryLane = suspenseState.retryLane;
  }
  retryTimedOutBoundary(boundaryFiber, retryLane);
}

export function resolveRetryWakeable(boundaryFiber: Fiber, wakeable: Wakeable) {
  let retryLane = NoLane; // Default
  let retryCache: WeakSet<Wakeable> | Set<Wakeable> | null;
  if (enableSuspenseServerRenderer) {
    switch (boundaryFiber.tag) {
      case SuspenseComponent:
        retryCache = boundaryFiber.stateNode;
        const suspenseState: null | SuspenseState = boundaryFiber.memoizedState;
        if (suspenseState !== null) {
          retryLane = suspenseState.retryLane;
        }
        break;
      case SuspenseListComponent:
        retryCache = boundaryFiber.stateNode;
        break;
      default:
        invariant(
          false,
          'Pinged unknown suspense boundary type. ' +
            'This is probably a bug in React.',
        );
    }
  } else {
    retryCache = boundaryFiber.stateNode;
  }

  if (retryCache !== null) {
    // The wakeable resolved, so we no longer need to memoize, because it will
    // never be thrown again.
    retryCache.delete(wakeable);
  }

  retryTimedOutBoundary(boundaryFiber, retryLane);
}

// Computes the next Just Noticeable Difference (JND) boundary.
// The theory is that a person can't tell the difference between small differences in time.
// Therefore, if we wait a bit longer than necessary that won't translate to a noticeable
// difference in the experience. However, waiting for longer might mean that we can avoid
// showing an intermediate loading state. The longer we have already waited, the harder it
// is to tell small differences in time. Therefore, the longer we've already waited,
// the longer we can wait additionally. At some point we have to give up though.
// We pick a train model where the next boundary commits at a consistent schedule.
// These particular numbers are vague estimates. We expect to adjust them based on research.
function jnd(timeElapsed: number) {
  return timeElapsed < 120
    ? 120
    : timeElapsed < 480
    ? 480
    : timeElapsed < 1080
    ? 1080
    : timeElapsed < 1920
    ? 1920
    : timeElapsed < 3000
    ? 3000
    : timeElapsed < 4320
    ? 4320
    : ceil(timeElapsed / 1960) * 1960;
}

function checkForNestedUpdates() {
  if (nestedUpdateCount > NESTED_UPDATE_LIMIT) {
    nestedUpdateCount = 0;
    rootWithNestedUpdates = null;
    invariant(
      false,
      'Maximum update depth exceeded. This can happen when a component ' +
        'repeatedly calls setState inside componentWillUpdate or ' +
        'componentDidUpdate. React limits the number of nested updates to ' +
        'prevent infinite loops.',
    );
  }

  if (__DEV__) {
    if (nestedPassiveUpdateCount > NESTED_PASSIVE_UPDATE_LIMIT) {
      nestedPassiveUpdateCount = 0;
      console.error(
        'Maximum update depth exceeded. This can happen when a component ' +
          "calls setState inside useEffect, but useEffect either doesn't " +
          'have a dependency array, or one of the dependencies changes on ' +
          'every render.',
      );
    }
  }
}

function flushRenderPhaseStrictModeWarningsInDEV() {
  if (__DEV__) {
    ReactStrictModeWarnings.flushLegacyContextWarning();

    if (warnAboutDeprecatedLifecycles) {
      ReactStrictModeWarnings.flushPendingUnsafeLifecycleWarnings();
    }
  }
}

function commitDoubleInvokeEffectsInDEV(
  fiber: Fiber,
  hasPassiveEffects: boolean,
) {
  if (__DEV__ && enableStrictEffects) {
    // TODO (StrictEffects) Should we set a marker on the root if it contains strict effects
    // so we don't traverse unnecessarily? similar to subtreeFlags but just at the root level.
    // Maybe not a big deal since this is DEV only behavior.

    setCurrentDebugFiberInDEV(fiber);
    invokeEffectsInDev(fiber, MountLayoutDev, invokeLayoutEffectUnmountInDEV);
    if (hasPassiveEffects) {
      invokeEffectsInDev(
        fiber,
        MountPassiveDev,
        invokePassiveEffectUnmountInDEV,
      );
    }

    invokeEffectsInDev(fiber, MountLayoutDev, invokeLayoutEffectMountInDEV);
    if (hasPassiveEffects) {
      invokeEffectsInDev(fiber, MountPassiveDev, invokePassiveEffectMountInDEV);
    }
    resetCurrentDebugFiberInDEV();
  }
}

function invokeEffectsInDev(
  firstChild: Fiber,
  fiberFlags: Flags,
  invokeEffectFn: (fiber: Fiber) => void,
): void {
  if (__DEV__ && enableStrictEffects) {
    // We don't need to re-check StrictEffectsMode here.
    // This function is only called if that check has already passed.

    let current = firstChild;
    let subtreeRoot = null;
    while (current !== null) {
      const primarySubtreeFlag = current.subtreeFlags & fiberFlags;
      if (
        current !== subtreeRoot &&
        current.child !== null &&
        primarySubtreeFlag !== NoFlags
      ) {
        current = current.child;
      } else {
        if ((current.flags & fiberFlags) !== NoFlags) {
          invokeEffectFn(current);
        }

        if (current.sibling !== null) {
          current = current.sibling;
        } else {
          current = subtreeRoot = current.return;
        }
      }
    }
  }
}

let didWarnStateUpdateForNotYetMountedComponent: Set<string> | null = null;
function warnAboutUpdateOnNotYetMountedFiberInDEV(fiber) {
  if (__DEV__) {
    if ((executionContext & RenderContext) !== NoContext) {
      // We let the other warning about render phase updates deal with this one.
      return;
    }

    if (!(fiber.mode & ConcurrentMode)) {
      return;
    }

    const tag = fiber.tag;
    if (
      tag !== IndeterminateComponent &&
      tag !== HostRoot &&
      tag !== ClassComponent &&
      tag !== FunctionComponent &&
      tag !== ForwardRef &&
      tag !== MemoComponent &&
      tag !== SimpleMemoComponent
    ) {
      // Only warn for user-defined components, not internal ones like Suspense.
      return;
    }

    // We show the whole stack but dedupe on the top component's name because
    // the problematic code almost always lies inside that component.
    const componentName = getComponentNameFromFiber(fiber) || 'ReactComponent';
    if (didWarnStateUpdateForNotYetMountedComponent !== null) {
      if (didWarnStateUpdateForNotYetMountedComponent.has(componentName)) {
        return;
      }
      didWarnStateUpdateForNotYetMountedComponent.add(componentName);
    } else {
      didWarnStateUpdateForNotYetMountedComponent = new Set([componentName]);
    }

    const previousFiber = ReactCurrentFiberCurrent;
    try {
      setCurrentDebugFiberInDEV(fiber);
      console.error(
        "Can't perform a React state update on a component that hasn't mounted yet. " +
          'This indicates that you have a side-effect in your render function that ' +
          'asynchronously later calls tries to update the component. Move this work to ' +
          'useEffect instead.',
      );
    } finally {
      if (previousFiber) {
        setCurrentDebugFiberInDEV(fiber);
      } else {
        resetCurrentDebugFiberInDEV();
      }
    }
  }
}

let didWarnStateUpdateForUnmountedComponent: Set<string> | null = null;
function warnAboutUpdateOnUnmountedFiberInDEV(fiber) {
  if (__DEV__) {
    const tag = fiber.tag;
    if (
      tag !== HostRoot &&
      tag !== ClassComponent &&
      tag !== FunctionComponent &&
      tag !== ForwardRef &&
      tag !== MemoComponent &&
      tag !== SimpleMemoComponent
    ) {
      // Only warn for user-defined components, not internal ones like Suspense.
      return;
    }

    if ((fiber.flags & PassiveStatic) !== NoFlags) {
      const updateQueue: FunctionComponentUpdateQueue | null = (fiber.updateQueue: any);
      if (updateQueue !== null) {
        const lastEffect = updateQueue.lastEffect;
        if (lastEffect !== null) {
          const firstEffect = lastEffect.next;

          let effect = firstEffect;
          do {
            if (effect.destroy !== undefined) {
              if ((effect.tag & HookPassive) !== NoHookEffect) {
                return;
              }
            }
            effect = effect.next;
          } while (effect !== firstEffect);
        }
      }
    }
    // We show the whole stack but dedupe on the top component's name because
    // the problematic code almost always lies inside that component.
    const componentName = getComponentNameFromFiber(fiber) || 'ReactComponent';
    if (didWarnStateUpdateForUnmountedComponent !== null) {
      if (didWarnStateUpdateForUnmountedComponent.has(componentName)) {
        return;
      }
      didWarnStateUpdateForUnmountedComponent.add(componentName);
    } else {
      didWarnStateUpdateForUnmountedComponent = new Set([componentName]);
    }

    if (isFlushingPassiveEffects) {
      // Do not warn if we are currently flushing passive effects!
      //
      // React can't directly detect a memory leak, but there are some clues that warn about one.
      // One of these clues is when an unmounted React component tries to update its state.
      // For example, if a component forgets to remove an event listener when unmounting,
      // that listener may be called later and try to update state,
      // at which point React would warn about the potential leak.
      //
      // Warning signals are the most useful when they're strong.
      // (So we should avoid false positive warnings.)
      // Updating state from within an effect cleanup function is sometimes a necessary pattern, e.g.:
      // 1. Updating an ancestor that a component had registered itself with on mount.
      // 2. Resetting state when a component is hidden after going offscreen.
    } else {
      const previousFiber = ReactCurrentFiberCurrent;
      try {
        setCurrentDebugFiberInDEV(fiber);
        console.error(
          "Can't perform a React state update on an unmounted component. This " +
            'is a no-op, but it indicates a memory leak in your application. To ' +
            'fix, cancel all subscriptions and asynchronous tasks in %s.',
          tag === ClassComponent
            ? 'the componentWillUnmount method'
            : 'a useEffect cleanup function',
        );
      } finally {
        if (previousFiber) {
          setCurrentDebugFiberInDEV(fiber);
        } else {
          resetCurrentDebugFiberInDEV();
        }
      }
    }
  }
}

let beginWork;
if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {
  const dummyFiber = null;
  beginWork = (current, unitOfWork, lanes) => {
    // If a component throws an error, we replay it again in a synchronously
    // dispatched event, so that the debugger will treat it as an uncaught
    // error See ReactErrorUtils for more information.

    // Before entering the begin phase, copy the work-in-progress onto a dummy
    // fiber. If beginWork throws, we'll use this to reset the state.
    const originalWorkInProgressCopy = assignFiberPropertiesInDEV(
      dummyFiber,
      unitOfWork,
    );
    try {
      return originalBeginWork(current, unitOfWork, lanes);
    } catch (originalError) {
      if (
        originalError !== null &&
        typeof originalError === 'object' &&
        typeof originalError.then === 'function'
      ) {
        // Don't replay promises. Treat everything else like an error.
        throw originalError;
      }

      // Keep this code in sync with handleError; any changes here must have
      // corresponding changes there.
      resetContextDependencies();
      resetHooksAfterThrow();
      // Don't reset current debug fiber, since we're about to work on the
      // same fiber again.

      // Unwind the failed stack frame
      unwindInterruptedWork(unitOfWork, workInProgressRootRenderLanes);

      // Restore the original properties of the fiber.
      assignFiberPropertiesInDEV(unitOfWork, originalWorkInProgressCopy);

      if (enableProfilerTimer && unitOfWork.mode & ProfileMode) {
        // Reset the profiler timer.
        startProfilerTimer(unitOfWork);
      }

      // Run beginWork again.
      invokeGuardedCallback(
        null,
        originalBeginWork,
        null,
        current,
        unitOfWork,
        lanes,
      );

      if (hasCaughtError()) {
        const replayError = clearCaughtError();
        if (
          typeof replayError === 'object' &&
          replayError !== null &&
          replayError._suppressLogging &&
          typeof originalError === 'object' &&
          originalError !== null &&
          !originalError._suppressLogging
        ) {
          // If suppressed, let the flag carry over to the original error which is the one we'll rethrow.
          originalError._suppressLogging = true;
        }
      }
      // We always throw the original error in case the second render pass is not idempotent.
      // This can happen if a memoized function or CommonJS module doesn't throw after first invokation.
      throw originalError;
    }
  };
} else {
  beginWork = originalBeginWork;
}

let didWarnAboutUpdateInRender = false;
let didWarnAboutUpdateInRenderForAnotherComponent;
if (__DEV__) {
  didWarnAboutUpdateInRenderForAnotherComponent = new Set();
}

function warnAboutRenderPhaseUpdatesInDEV(fiber) {
  if (__DEV__) {
    if (
      ReactCurrentDebugFiberIsRenderingInDEV &&
      (executionContext & RenderContext) !== NoContext &&
      !getIsUpdatingOpaqueValueInRenderPhaseInDEV()
    ) {
      switch (fiber.tag) {
        case FunctionComponent:
        case ForwardRef:
        case SimpleMemoComponent: {
          const renderingComponentName =
            (workInProgress && getComponentNameFromFiber(workInProgress)) ||
            'Unknown';
          // Dedupe by the rendering component because it's the one that needs to be fixed.
          const dedupeKey = renderingComponentName;
          if (!didWarnAboutUpdateInRenderForAnotherComponent.has(dedupeKey)) {
            didWarnAboutUpdateInRenderForAnotherComponent.add(dedupeKey);
            const setStateComponentName =
              getComponentNameFromFiber(fiber) || 'Unknown';
            console.error(
              'Cannot update a component (`%s`) while rendering a ' +
                'different component (`%s`). To locate the bad setState() call inside `%s`, ' +
                'follow the stack trace as described in https://reactjs.org/link/setstate-in-render',
              setStateComponentName,
              renderingComponentName,
              renderingComponentName,
            );
          }
          break;
        }
        case ClassComponent: {
          if (!didWarnAboutUpdateInRender) {
            console.error(
              'Cannot update during an existing state transition (such as ' +
                'within `render`). Render methods should be a pure ' +
                'function of props and state.',
            );
            didWarnAboutUpdateInRender = true;
          }
          break;
        }
      }
    }
  }
}

// a 'shared' variable that changes when act() opens/closes in tests.
export const IsThisRendererActing = {current: (false: boolean)};

export function restorePendingUpdaters(root: FiberRoot, lanes: Lanes): void {
  if (enableUpdaterTracking) {
    if (isDevToolsPresent) {
      const memoizedUpdaters = root.memoizedUpdaters;
      memoizedUpdaters.forEach(schedulingFiber => {
        addFiberToLanesMap(root, schedulingFiber, lanes);
      });

      // This function intentionally does not clear memoized updaters.
      // Those may still be relevant to the current commit
      // and a future one (e.g. Suspense).
    }
  }
}

export function warnIfNotScopedWithMatchingAct(fiber: Fiber): void {
  if (__DEV__) {
    if (
      warnsIfNotActing === true &&
      IsSomeRendererActing.current === true &&
      IsThisRendererActing.current !== true
    ) {
      const previousFiber = ReactCurrentFiberCurrent;
      try {
        setCurrentDebugFiberInDEV(fiber);
        console.error(
          "It looks like you're using the wrong act() around your test interactions.\n" +
            'Be sure to use the matching version of act() corresponding to your renderer:\n\n' +
            '// for react-dom:\n' +
            // Break up imports to avoid accidentally parsing them as dependencies.
            'import {act} fr' +
            "om 'react-dom/test-utils';\n" +
            '// ...\n' +
            'act(() => ...);\n\n' +
            '// for react-test-renderer:\n' +
            // Break up imports to avoid accidentally parsing them as dependencies.
            'import TestRenderer fr' +
            "om 'react-test-renderer';\n" +
            'const {act} = TestRenderer;\n' +
            '// ...\n' +
            'act(() => ...);',
        );
      } finally {
        if (previousFiber) {
          setCurrentDebugFiberInDEV(fiber);
        } else {
          resetCurrentDebugFiberInDEV();
        }
      }
    }
  }
}

export function warnIfNotCurrentlyActingEffectsInDEV(fiber: Fiber): void {
  if (__DEV__) {
    if (
      warnsIfNotActing === true &&
      (fiber.mode & StrictLegacyMode) !== NoMode &&
      IsSomeRendererActing.current === false &&
      IsThisRendererActing.current === false
    ) {
      console.error(
        'An update to %s ran an effect, but was not wrapped in act(...).\n\n' +
          'When testing, code that causes React state updates should be ' +
          'wrapped into act(...):\n\n' +
          'act(() => {\n' +
          '  /* fire events that update state */\n' +
          '});\n' +
          '/* assert on the output */\n\n' +
          "This ensures that you're testing the behavior the user would see " +
          'in the browser.' +
          ' Learn more at https://reactjs.org/link/wrap-tests-with-act',
        getComponentNameFromFiber(fiber),
      );
    }
  }
}

function warnIfNotCurrentlyActingUpdatesInDEV(fiber: Fiber): void {
  if (__DEV__) {
    if (
      warnsIfNotActing === true &&
      executionContext === NoContext &&
      IsSomeRendererActing.current === false &&
      IsThisRendererActing.current === false
    ) {
      const previousFiber = ReactCurrentFiberCurrent;
      try {
        setCurrentDebugFiberInDEV(fiber);
        console.error(
          'An update to %s inside a test was not wrapped in act(...).\n\n' +
            'When testing, code that causes React state updates should be ' +
            'wrapped into act(...):\n\n' +
            'act(() => {\n' +
            '  /* fire events that update state */\n' +
            '});\n' +
            '/* assert on the output */\n\n' +
            "This ensures that you're testing the behavior the user would see " +
            'in the browser.' +
            ' Learn more at https://reactjs.org/link/wrap-tests-with-act',
          getComponentNameFromFiber(fiber),
        );
      } finally {
        if (previousFiber) {
          setCurrentDebugFiberInDEV(fiber);
        } else {
          resetCurrentDebugFiberInDEV();
        }
      }
    }
  }
}

export const warnIfNotCurrentlyActingUpdatesInDev = warnIfNotCurrentlyActingUpdatesInDEV;

// In tests, we want to enforce a mocked scheduler.
let didWarnAboutUnmockedScheduler = false;
// TODO Before we release concurrent mode, revisit this and decide whether a mocked
// scheduler is the actual recommendation. The alternative could be a testing build,
// a new lib, or whatever; we dunno just yet. This message is for early adopters
// to get their tests right.

export function warnIfUnmockedScheduler(fiber: Fiber) {
  if (__DEV__) {
    if (
      didWarnAboutUnmockedScheduler === false &&
      Scheduler.unstable_flushAllWithoutAsserting === undefined
    ) {
      if (fiber.mode & ConcurrentMode) {
        didWarnAboutUnmockedScheduler = true;
        console.error(
          'In Concurrent or Sync modes, the "scheduler" module needs to be mocked ' +
            'to guarantee consistent behaviour across tests and browsers. ' +
            'For example, with jest: \n' +
            // Break up requires to avoid accidentally parsing them as dependencies.
            "jest.mock('scheduler', () => require" +
            "('scheduler/unstable_mock'));\n\n" +
            'For more info, visit https://reactjs.org/link/mock-scheduler',
        );
      } else if (warnAboutUnmockedScheduler === true) {
        didWarnAboutUnmockedScheduler = true;
        console.error(
          'Starting from React v18, the "scheduler" module will need to be mocked ' +
            'to guarantee consistent behaviour across tests and browsers. ' +
            'For example, with jest: \n' +
            // Break up requires to avoid accidentally parsing them as dependencies.
            "jest.mock('scheduler', () => require" +
            "('scheduler/unstable_mock'));\n\n" +
            'For more info, visit https://reactjs.org/link/mock-scheduler',
        );
      }
    }
  }
}

// `act` testing API
//
// TODO: This is mostly a copy-paste from the legacy `act`, which does not have
// access to the same internals that we do here. Some trade offs in the
// implementation no longer make sense.

let isFlushingAct = false;
let isInsideThisAct = false;

function shouldForceFlushFallbacksInDEV() {
  // Never force flush in production. This function should get stripped out.
  return __DEV__ && actingUpdatesScopeDepth > 0;
}

const flushMockScheduler = Scheduler.unstable_flushAllWithoutAsserting;
const isSchedulerMocked = typeof flushMockScheduler === 'function';

// Returns whether additional work was scheduled. Caller should keep flushing
// until there's no work left.
function flushActWork(): boolean {
  if (flushMockScheduler !== undefined) {
    const prevIsFlushing = isFlushingAct;
    isFlushingAct = true;
    try {
      return flushMockScheduler();
    } finally {
      isFlushingAct = prevIsFlushing;
    }
  } else {
    // No mock scheduler available. However, the only type of pending work is
    // passive effects, which we control. So we can flush that.
    const prevIsFlushing = isFlushingAct;
    isFlushingAct = true;
    try {
      let didFlushWork = false;
      while (flushPassiveEffects()) {
        didFlushWork = true;
      }
      return didFlushWork;
    } finally {
      isFlushingAct = prevIsFlushing;
    }
  }
}

function flushWorkAndMicroTasks(onDone: (err: ?Error) => void) {
  try {
    flushActWork();
    enqueueTask(() => {
      if (flushActWork()) {
        flushWorkAndMicroTasks(onDone);
      } else {
        onDone();
      }
    });
  } catch (err) {
    onDone(err);
  }
}

// we track the 'depth' of the act() calls with this counter,
// so we can tell if any async act() calls try to run in parallel.

let actingUpdatesScopeDepth = 0;
let didWarnAboutUsingActInProd = false;

export function act(callback: () => Thenable<mixed>): Thenable<void> {
  if (!__DEV__) {
    if (didWarnAboutUsingActInProd === false) {
      didWarnAboutUsingActInProd = true;
      // eslint-disable-next-line react-internal/no-production-logging
      console.error(
        'act(...) is not supported in production builds of React, and might not behave as expected.',
      );
    }
  }

  const previousActingUpdatesScopeDepth = actingUpdatesScopeDepth;
  actingUpdatesScopeDepth++;

  const previousIsSomeRendererActing = IsSomeRendererActing.current;
  const previousIsThisRendererActing = IsThisRendererActing.current;
  const previousIsInsideThisAct = isInsideThisAct;
  IsSomeRendererActing.current = true;
  IsThisRendererActing.current = true;
  isInsideThisAct = true;

  function onDone() {
    actingUpdatesScopeDepth--;
    IsSomeRendererActing.current = previousIsSomeRendererActing;
    IsThisRendererActing.current = previousIsThisRendererActing;
    isInsideThisAct = previousIsInsideThisAct;
    if (__DEV__) {
      if (actingUpdatesScopeDepth > previousActingUpdatesScopeDepth) {
        // if it's _less than_ previousActingUpdatesScopeDepth, then we can assume the 'other' one has warned
        console.error(
          'You seem to have overlapping act() calls, this is not supported. ' +
            'Be sure to await previous act() calls before making a new one. ',
        );
      }
    }
  }

  let result;
  try {
    result = batchedUpdates(callback);
  } catch (error) {
    // on sync errors, we still want to 'cleanup' and decrement actingUpdatesScopeDepth
    onDone();
    throw error;
  }

  if (
    result !== null &&
    typeof result === 'object' &&
    typeof result.then === 'function'
  ) {
    // setup a boolean that gets set to true only
    // once this act() call is await-ed
    let called = false;
    if (__DEV__) {
      if (typeof Promise !== 'undefined') {
        //eslint-disable-next-line no-undef
        Promise.resolve()
          .then(() => {})
          .then(() => {
            if (called === false) {
              console.error(
                'You called act(async () => ...) without await. ' +
                  'This could lead to unexpected testing behaviour, interleaving multiple act ' +
                  'calls and mixing their scopes. You should - await act(async () => ...);',
              );
            }
          });
      }
    }

    // in the async case, the returned thenable runs the callback, flushes
    // effects and  microtasks in a loop until flushPassiveEffects() === false,
    // and cleans up
    return {
      then(resolve, reject) {
        called = true;
        result.then(
          () => {
            if (
              actingUpdatesScopeDepth > 1 ||
              (isSchedulerMocked === true &&
                previousIsSomeRendererActing === true)
            ) {
              onDone();
              resolve();
              return;
            }
            // we're about to exit the act() scope,
            // now's the time to flush tasks/effects
            flushWorkAndMicroTasks((err: ?Error) => {
              onDone();
              if (err) {
                reject(err);
              } else {
                resolve();
              }
            });
          },
          err => {
            onDone();
            reject(err);
          },
        );
      },
    };
  } else {
    if (__DEV__) {
      if (result !== undefined) {
        console.error(
          'The callback passed to act(...) function ' +
            'must return undefined, or a Promise. You returned %s',
          result,
        );
      }
    }

    // flush effects until none remain, and cleanup
    try {
      if (
        actingUpdatesScopeDepth === 1 &&
        (isSchedulerMocked === false || previousIsSomeRendererActing === false)
      ) {
        // we're about to exit the act() scope,
        // now's the time to flush effects
        flushActWork();
      }
      onDone();
    } catch (err) {
      onDone();
      throw err;
    }

    // in the sync case, the returned thenable only warns *if* await-ed
    return {
      then(resolve) {
        if (__DEV__) {
          console.error(
            'Do not await the result of calling act(...) with sync logic, it is not a Promise.',
          );
        }
        resolve();
      },
    };
  }
}