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react/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
T
Benoit Girard 25bfa287f6 [Experiment] Add feature flag for more aggressive memory clean-up of deleted fiber trees (#21039)
* Add feature flag: enableStrongMemoryCleanup

Add a feature flag that will test doing a recursive clean of an unmount
node. This will disconnect the fiber graph making leaks less severe.

* Detach sibling pointers in old child list

When a fiber is deleted, it's still part of the previous (alternate)
parent fiber's list of children. Because children are a linked list, an
earlier sibling that's still alive will be connected to the deleted
fiber via its alternate:


  live fiber
  --alternate--> previous live fiber
  --sibling--> deleted fiber

We can't disconnect `alternate` on nodes that haven't been deleted
yet, but we can disconnect the `sibling` and `child` pointers.

Will use this feature flag to test the memory impact.

* Combine into single enum flag

I combined `enableStrongMemoryCleanup` and `enableDetachOldChildList`
into a single enum flag. The flag has three possible values. Each level
is a superset of the previous one and performs more aggressive clean up.

We will use this to compare the memory impact of each level.

* Add Flow type to new host config method

* Re-use existing recursive clean up path

We already have a recursive loop that visits every deleted fiber. We
can re-use that one for clean up instead of adding another one.

Co-authored-by: Andrew Clark <git@andrewclark.io>
2021-03-22 21:54:53 -07:00

67 lines
2.8 KiB
JavaScript

/**
* 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 typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
import typeof * as ExportsType from './ReactFeatureFlags.test-renderer';
export const debugRenderPhaseSideEffectsForStrictMode = false;
export const enableDebugTracing = false;
export const enableSchedulingProfiler = false;
export const warnAboutDeprecatedLifecycles = true;
export const replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
export const enableProfilerTimer = __PROFILE__;
export const enableProfilerCommitHooks = false;
export const enableProfilerNestedUpdatePhase = false;
export const enableProfilerNestedUpdateScheduledHook = false;
export const enableSchedulerTracing = __PROFILE__;
export const enableSuspenseServerRenderer = false;
export const enableSelectiveHydration = false;
export const enableLazyElements = false;
export const enableCache = false;
export const disableJavaScriptURLs = false;
export const disableInputAttributeSyncing = false;
export const enableSchedulerDebugging = false;
export const enableScopeAPI = false;
export const enableCreateEventHandleAPI = false;
export const warnAboutUnmockedScheduler = false;
export const enableSuspenseCallback = false;
export const warnAboutDefaultPropsOnFunctionComponents = false;
export const warnAboutStringRefs = false;
export const disableLegacyContext = false;
export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
export const enableTrustedTypesIntegration = false;
export const disableTextareaChildren = false;
export const disableModulePatternComponents = false;
export const warnUnstableRenderSubtreeIntoContainer = false;
export const warnAboutSpreadingKeyToJSX = false;
export const enableComponentStackLocations = false;
export const enableLegacyFBSupport = false;
export const enableFilterEmptyStringAttributesDOM = false;
export const disableNativeComponentFrames = false;
export const skipUnmountedBoundaries = false;
export const deletedTreeCleanUpLevel = 1;
export const enableNewReconciler = false;
export const deferRenderPhaseUpdateToNextBatch = true;
export const enableDiscreteEventFlushingChange = false;
export const enableStrictEffects = false;
export const createRootStrictEffectsByDefault = false;
export const enableUseRefAccessWarning = false;
export const enableRecursiveCommitTraversal = false;
export const disableSchedulerTimeoutInWorkLoop = false;
export const enableLazyContextPropagation = false;
// Flow magic to verify the exports of this file match the original version.
// eslint-disable-next-line no-unused-vars
type Check<_X, Y: _X, X: Y = _X> = null;
// eslint-disable-next-line no-unused-expressions
(null: Check<ExportsType, FeatureFlagsType>);