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When React schedules a rendering task, it passes a `timeout` option based on its expiration time. This is intended to avoid starvation by other React updates. However, it also affects the relative priority of React tasks and other Scheduler tasks at the same level, like data processing. This adds a feature flag to disable passing a `timeout` option to Scheduler. React tasks will always append themselves to the end of the queue, without jumping ahead of already scheduled tasks. This does not affect the order in which React updates within a single root are processed, but it could affect updates across multiple roots. This also doesn't remove the expiration from Scheduler. It only means that React tasks are not given special treatment.
99 lines
3.9 KiB
JavaScript
99 lines
3.9 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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*/
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export const enableUserTimingAPI = __DEV__;
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// Helps identify side effects in begin-phase lifecycle hooks and setState reducers:
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export const debugRenderPhaseSideEffects = false;
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// In some cases, StrictMode should also double-render lifecycles.
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// This can be confusing for tests though,
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// And it can be bad for performance in production.
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// This feature flag can be used to control the behavior:
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export const debugRenderPhaseSideEffectsForStrictMode = __DEV__;
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// To preserve the "Pause on caught exceptions" behavior of the debugger, we
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// replay the begin phase of a failed component inside invokeGuardedCallback.
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export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
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// Warn about deprecated, async-unsafe lifecycles; relates to RFC #6:
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export const warnAboutDeprecatedLifecycles = true;
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// Gather advanced timing metrics for Profiler subtrees.
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export const enableProfilerTimer = __PROFILE__;
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// Trace which interactions trigger each commit.
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export const enableSchedulerTracing = __PROFILE__;
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// Only used in www builds.
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export const enableSuspenseServerRenderer = false; // TODO: __DEV__? Here it might just be false.
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// Only used in www builds.
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export const enableSchedulerDebugging = false;
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// Only used in www builds.
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export function addUserTimingListener() {
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throw new Error('Not implemented.');
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}
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// Disable javascript: URL strings in href for XSS protection.
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export const disableJavaScriptURLs = false;
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// React Fire: prevent the value and checked attributes from syncing
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// with their related DOM properties
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export const disableInputAttributeSyncing = false;
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// These APIs will no longer be "unstable" in the upcoming 16.7 release,
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// Control this behavior with a flag to support 16.6 minor releases in the meanwhile.
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export const enableStableConcurrentModeAPIs = false;
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export const warnAboutShorthandPropertyCollision = false;
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// See https://github.com/react-native-community/discussions-and-proposals/issues/72 for more information
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// This is a flag so we can fix warnings in RN core before turning it on
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export const warnAboutDeprecatedSetNativeProps = false;
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// Experimental React Flare event system and event components support.
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export const enableFlareAPI = false;
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// Experimental Host Component support.
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export const enableFundamentalAPI = false;
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// New API for JSX transforms to target - https://github.com/reactjs/rfcs/pull/107
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export const enableJSXTransformAPI = false;
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// We will enforce mocking scheduler with scheduler/unstable_mock at some point. (v17?)
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// Till then, we warn about the missing mock, but still fallback to a sync mode compatible version
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export const warnAboutUnmockedScheduler = false;
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// Temporary flag to revert the fix in #15650
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export const revertPassiveEffectsChange = false;
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// For tests, we flush suspense fallbacks in an act scope;
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// *except* in some of our own tests, where we test incremental loading states.
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export const flushSuspenseFallbacksInTests = true;
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// Changes priority of some events like mousemove to user-blocking priority,
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// but without making them discrete. The flag exists in case it causes
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// starvation problems.
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export const enableUserBlockingEvents = false;
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// Add a callback property to suspense to notify which promises are currently
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// in the update queue. This allows reporting and tracing of what is causing
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// the user to see a loading state.
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export const enableSuspenseCallback = false;
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// Part of the simplification of React.createElement so we can eventually move
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// from React.createElement to React.jsx
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// https://github.com/reactjs/rfcs/blob/createlement-rfc/text/0000-create-element-changes.md
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export const warnAboutDefaultPropsOnFunctionComponents = false;
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export const disableLegacyContext = false;
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export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
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