mirror of
https://github.com/zebrajr/react.git
synced 2025-12-07 12:20:38 +01:00
fe21c947c8
This flag first moves the `shouldYield()` logic into React itself. We need this for `postTask` compatibility anyway since this logic is no longer a concern of the scheduler. This means that there can also be no global `requestPaint()` that asks for painting earlier. So this is best rolled out with `enableAlwaysYieldScheduler` (and ideally `enableYieldingBeforePassive`) instead of `enableRequestPaint`. Once in React we can change the yield timing heuristics. This uses the previous 5ms for Idle work to keep everything responsive while doing background work. However, for Transitions and Retries we have seen that same thread animations (like loading states animating, or constant animations like cool Three.js stuff) can take CPU time away from the Transition that causes moving into new content to slow down. Therefore we only yield every 25ms. The purpose of this yield is not to avoid the overhead of yielding, which is very low, but rather to intentionally block any frequently occurring other main thread work like animations from starving our work. If we could we could just tell everyone else to throttle their stuff for ideal scheduling but that's not quite realistic. In other words, the purpose of this is to reduce the frame rate of animations to 30 fps and we achieve this by not yielding. We still do yield to allow the animations to not just stall. This seems like a good balance. The 5ms of Idle is because we don't really need to yield less often since the overhead is low. We keep it low to allow 120 fps animations to run if necessary and our work may not be the only work within a frame so we need to yield early enough to leave enough time left. Similarly we choose 25ms rather than say 35ms to ensure that we push long enough to guarantee to half the frame rate but low enough that there's plenty of time left for a rAF to power each animation every other frame. It's also low enough that if something else interrupts the work like a new interaction, we can still be responsive to that within 50ms or so. We also need to yield in case there's I/O work that needs to get bounced through the main thread. This flag is currently off everywhere since we have so many other scheduling flags but that means there's some urgency to roll those out fully so we can test this one. There's also some tests to update since this doesn't go through the Mock scheduler anymore for yields.
96 lines
3.7 KiB
JavaScript
96 lines
3.7 KiB
JavaScript
/**
|
|
* 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 typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
|
|
import typeof * as ExportsType from './ReactFeatureFlags.test-renderer';
|
|
|
|
export const enableAsyncDebugInfo = false;
|
|
export const enableSchedulingProfiler = false;
|
|
export const enableProfilerTimer = __PROFILE__;
|
|
export const enableProfilerCommitHooks = __PROFILE__;
|
|
export const enableProfilerNestedUpdatePhase = __PROFILE__;
|
|
export const enableComponentPerformanceTrack = false;
|
|
export const enableUpdaterTracking = false;
|
|
export const enableLegacyCache = __EXPERIMENTAL__;
|
|
export const enableAsyncIterableChildren = false;
|
|
export const enableTaint = true;
|
|
export const enablePostpone = false;
|
|
export const enableHalt = false;
|
|
export const disableCommentsAsDOMContainers = true;
|
|
export const disableInputAttributeSyncing = false;
|
|
export const enableScopeAPI = false;
|
|
export const enableCreateEventHandleAPI = false;
|
|
export const enableSuspenseCallback = false;
|
|
export const enableTrustedTypesIntegration = false;
|
|
export const disableTextareaChildren = false;
|
|
export const enableSuspenseAvoidThisFallback = false;
|
|
export const enableCPUSuspense = false;
|
|
export const enableNoCloningMemoCache = false;
|
|
export const enableUseEffectEventHook = false;
|
|
export const favorSafetyOverHydrationPerf = true;
|
|
export const enableLegacyFBSupport = false;
|
|
export const enableMoveBefore = false;
|
|
export const enableGetInspectorDataForInstanceInProduction = false;
|
|
export const enableFabricCompleteRootInCommitPhase = false;
|
|
export const enableHiddenSubtreeInsertionEffectCleanup = false;
|
|
export const enableHydrationLaneScheduling = true;
|
|
|
|
export const enableRetryLaneExpiration = false;
|
|
export const retryLaneExpirationMs = 5000;
|
|
export const syncLaneExpirationMs = 250;
|
|
export const transitionLaneExpirationMs = 5000;
|
|
|
|
export const disableSchedulerTimeoutInWorkLoop = false;
|
|
export const enableLegacyHidden = false;
|
|
|
|
export const enableTransitionTracing = false;
|
|
|
|
export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
|
|
export const enableFizzExternalRuntime = true;
|
|
export const enableDeferRootSchedulingToMicrotask = true;
|
|
|
|
export const alwaysThrottleRetries = true;
|
|
|
|
export const passChildrenWhenCloningPersistedNodes = false;
|
|
export const enablePersistedModeClonedFlag = false;
|
|
export const disableClientCache = true;
|
|
|
|
export const enableServerComponentLogs = true;
|
|
export const enableInfiniteRenderLoopDetection = false;
|
|
|
|
export const renameElementSymbol = true;
|
|
export const enableShallowPropDiffing = false;
|
|
export const enableSiblingPrerendering = true;
|
|
|
|
export const enableUseResourceEffectHook = false;
|
|
|
|
export const enableYieldingBeforePassive = true;
|
|
|
|
export const enableThrottledScheduling = false;
|
|
|
|
// TODO: This must be in sync with the main ReactFeatureFlags file because
|
|
// the Test Renderer's value must be the same as the one used by the
|
|
// react package.
|
|
//
|
|
// We really need to get rid of this whole module. Any test renderer specific
|
|
// flags should be handled by the Fiber config.
|
|
// const __NEXT_MAJOR__ = __EXPERIMENTAL__;
|
|
export const disableLegacyMode = true;
|
|
export const disableLegacyContext = true;
|
|
export const disableLegacyContextForFunctionComponents = true;
|
|
export const enableRenderableContext = true;
|
|
export const enableReactTestRendererWarning = true;
|
|
export const disableDefaultPropsExceptForClasses = true;
|
|
|
|
export const enableObjectFiber = false;
|
|
export const enableOwnerStacks = false;
|
|
|
|
// Flow magic to verify the exports of this file match the original version.
|
|
((((null: any): ExportsType): FeatureFlagsType): ExportsType);
|