ReactFiberLane.js — react Source File

Source Code

/**
 * Copyright (c) Meta Platforms, Inc. and 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 {Fiber, FiberRoot} from './ReactInternalTypes';
import type {Transition} from 'react/src/ReactStartTransition';
import type {ConcurrentUpdate} from './ReactFiberConcurrentUpdates';

// TODO: Ideally these types would be opaque but that doesn't work well with
// our reconciler fork infra, since these leak into non-reconciler packages.

export type Lanes = number;
export type Lane = number;
export type LaneMap<T> = Array<T>;

import {
  enableRetryLaneExpiration,
  enableSchedulingProfiler,
  enableTransitionTracing,
  enableUpdaterTracking,
  syncLaneExpirationMs,
  transitionLaneExpirationMs,
  retryLaneExpirationMs,
  disableLegacyMode,
  enableDefaultTransitionIndicator,
  enableGestureTransition,
  enableParallelTransitions,
} from 'shared/ReactFeatureFlags';
import {isDevToolsPresent} from './ReactFiberDevToolsHook';
import {clz32} from './clz32';
import {LegacyRoot} from './ReactRootTags';

// Lane values below should be kept in sync with getLabelForLane(), used by react-devtools-timeline.
// If those values are changed that package should be rebuilt and redeployed.

export const TotalLanes = 31;

export const NoLanes: Lanes = /*                        */ 0b0000000000000000000000000000000;
export const NoLane: Lane = /*                          */ 0b0000000000000000000000000000000;

export const SyncHydrationLane: Lane = /*               */ 0b0000000000000000000000000000001;
export const SyncLane: Lane = /*                        */ 0b0000000000000000000000000000010;
export const SyncLaneIndex: number = 1;

export const InputContinuousHydrationLane: Lane = /*    */ 0b0000000000000000000000000000100;
export const InputContinuousLane: Lane = /*             */ 0b0000000000000000000000000001000;

export const DefaultHydrationLane: Lane = /*            */ 0b0000000000000000000000000010000;
export const DefaultLane: Lane = /*                     */ 0b0000000000000000000000000100000;

export const SyncUpdateLanes: Lane =
  SyncLane | InputContinuousLane | DefaultLane;

export const GestureLane: Lane = /*                     */ 0b0000000000000000000000001000000;

// ... (1248 more lines)