Remove vestigial Suspense batching logic #25861
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Comparing: b14d7fa...3211d12 Critical size changesIncludes critical production bundles, as well as any change greater than 2%:
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This code was originally added in the old ExpirationTime implementation of Suspense. The idea is that if multiple updates suspend inside the same Suspense boundary, and both of them resolve, we should render both results in the same batch, to reduce jank. This was an incomplete idea, though. We later discovered a stronger requirement — once we show a fallback, we cannot fill in that fallback without completing _all_ the updates that were previously skipped over. Otherwise you get tearing. This was fixed by facebook#18411, then we discovered additional related flaws that were addressed in facebook#24685. See those PR descriptions for additional context. So I believe this older code is no longer necessary.
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This code was originally added in the old ExpirationTime implementation of Suspense. The idea is that if multiple updates suspend inside the same Suspense boundary, and both of them resolve, we should render both results in the same batch, to reduce jank. This was an incomplete idea, though. We later discovered a stronger requirement — once we show a fallback, we cannot fill in that fallback without completing _all_ the updates that were previously skipped over. Otherwise you get tearing. This was fixed by #18411, then we discovered additional related flaws that were addressed in #24685. See those PR descriptions for additional context. So I believe this older code is no longer necessary. DiffTrain build for [48274a4](48274a4) [View git log for this commit](https://github.com/facebook/react/commits/48274a43aa708f63a7580142a4c1c1a47f31c1ac)
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Summary: This sync includes the following changes: - **[48b687fc9](facebook/react@48b687fc9 )**: [trusted types][www] Add enableTrustedTypesIntegration flag back in ([#26016](facebook/react#26016)) //<an onion>// - **[9b1423cc0](facebook/react@9b1423cc0 )**: Revert "Hold host functions in var" ([#26079](facebook/react#26079)) //<Samuel Susla>// - **[ce09ace9a](facebook/react@ce09ace9a )**: Improve Error Messages when Access Client References ([#26059](facebook/react#26059)) //<Sebastian Markbåge>// - **[0652bdbd1](facebook/react@0652bdbd1 )**: Add flow types to Maps in ReactNativeViewConfigRegistry.js ([#26064](facebook/react#26064)) //<Samuel Susla>// - **[ee8509801](facebook/react@ee8509801 )**: [cleanup] remove deletedTreeCleanUpLevel feature flag ([#25529](facebook/react#25529)) //<Jan Kassens>// - **[0e31dd028](facebook/react@0e31dd028 )**: Remove findDOMNode www shim ([#25998](facebook/react#25998)) //<Jan Kassens>// - **[379dd741e](facebook/react@379dd741e )**: [www] set enableTrustedTypesIntegration to false ([#25997](facebook/react#25997)) //<Jan Kassens>// - **[555ece0cd](facebook/react@555ece0cd )**: Don't warn about concurrently rendering contexts if we finished rendering ([#22797](facebook/react#22797)) //<Sebastian Silbermann>// - **[0fce6bb49](facebook/react@0fce6bb49 )**: [cleanup] remove feature flags warnAboutDefaultPropsOnFunctionComponents and warnAboutStringRefs ([#25980](facebook/react#25980)) //<Jan Kassens>// - **[7002a6743](facebook/react@7002a6743 )**: [cleanup] remove unused values from ReactFeatureFlags.www-dynamic ([#25575](facebook/react#25575)) //<Jan Kassens>// - **[a48e54f2b](facebook/react@a48e54f2b )**: [cleanup] remove old feature flag warnAboutDeprecatedLifecycles ([#25978](facebook/react#25978)) //<Jan Kassens>// - **[0f4a83596](facebook/react@0f4a83596 )**: Remove duplicate JSResourceReferenceImpl mock ([#25976](facebook/react#25976)) //<Jan Kassens>// - **[c49131669](facebook/react@c49131669 )**: Remove unused Flow suppressions ([#25977](facebook/react#25977)) //<Jan Kassens>// - **[afe6521](facebook/react@afe6521e1 )**: Refactor: remove useless parameter ([#25923](facebook/react#25923)) //<Chris>// - **[34464fb16](facebook/react@34464fb16 )**: Upgrade to Flow 0.196.3 ([#25974](facebook/react#25974)) //<Jan Kassens>// - **[e2424f33b](facebook/react@e2424f33b )**: [flow] enable exact_empty_objects ([#25973](facebook/react#25973)) //<Jan Kassens>// - **[0b4f44302](facebook/react@0b4f44302 )**: [flow] enable enforce_local_inference_annotations ([#25921](facebook/react#25921)) //<Jan Kassens>// - **[0b974418c](facebook/react@0b974418c )**: [Fizz] Fork Fizz instruction set for inline script and external runtime ([#25862](facebook/react#25862)) //<mofeiZ>// - **[5379b6123](facebook/react@5379b6123 )**: Batch sync, default and continuous lanes ([#25700](facebook/react#25700)) //<Tianyu Yao>// - **[bbf4d2211](facebook/react@bbf4d2211 )**: Update import for babel-code-frame in build script ([#25963](facebook/react#25963)) //<Ming Ye>// - **[b83baf63f](facebook/react@b83baf63f )**: Transform updates to support Flow this annotation syntax ([#25918](facebook/react#25918)) //<Jan Kassens>// - **[c2d655207](facebook/react@c2d655207 )**: Unify `use` and `renderDidSuspendDelayIfPossible` implementations ([#25922](facebook/react#25922)) //<Andrew Clark>// - **[48274a43a](facebook/react@48274a43a )**: Remove vestigial Suspense batching logic ([#25861](facebook/react#25861)) //<Andrew Clark>// - **[de7d1c907](facebook/react@de7d1c907 )**: Add `fetchPriority` to `<img>` and `<link>` ([#25927](facebook/react#25927)) //<Steven>// - **[81d4ee9ca](facebook/react@81d4ee9ca )**: reconciler docs: fix small typo - "mode" (instead of "node") ([#25863](facebook/react#25863)) //<satelllte>// - **[5fcf1a4b4](facebook/react@5fcf1a4b4 )**: Bugfix: Synchronous ping during render phase sometimes unwinds the stack, leading to crash ([#25851](facebook/react#25851)) //<Andrew Clark>// - **[2b1fb91a5](facebook/react@2b1fb91a5 )**: ESLint upgrade to use hermes-eslint ([#25915](facebook/react#25915)) //<Jan Kassens>// - **[fabef7a6b](facebook/react@fabef7a6b )**: Resubmit Add HydrationSyncLane ([#25878](facebook/react#25878)) //<Tianyu Yao>// - **[7efa9e597](facebook/react@7efa9e597 )**: Fix unwinding context during selective hydration ([#25876](facebook/react#25876)) //<Tianyu Yao>// - **[84a0a171e](facebook/react@84a0a171e )**: Rename experimental useEvent to useEffectEvent ([#25881](facebook/react#25881)) //<Sebastian Markbåge>// - **[4dda96a40](facebook/react@4dda96a40 )**: [react-www] remove forked bundle ([#25866](facebook/react#25866)) //<Jan Kassens>// - **[9c09c1cd6](facebook/react@9c09c1cd6 )**: Revert "Fork ReactDOMSharedInternals for www ([#25791](facebook/react#25791))" ([#25864](facebook/react#25864)) //<lauren>// - **[996e4c0d5](facebook/react@996e4c0d5 )**: Offscreen add attach ([#25603](facebook/react#25603)) //<Samuel Susla>// - **[b14d7fa4b](facebook/react@b14d7fa4b )**: Add support for setNativeProps to Fabric ([#25737](facebook/react#25737)) //<Samuel Susla>// - **[819687279](facebook/react@819687279 )**: [Float] Fix typo in ReactDOMResourceValidation.js ([#25798](facebook/react#25798)) //<Ikko Ashimine>// - **[5dfc485f6](facebook/react@5dfc485f6 )**: fix tests for when float is off ([#25839](facebook/react#25839)) //<Josh Story>// - **[bfcbf3306](facebook/react@bfcbf3306 )**: toString children of title ([#25838](facebook/react#25838)) //<Sebastian Markbåge>// - **[d4bc16a7d](facebook/react@d4bc16a7d )**: Revert "[react-www] remove forked bundle" ([#25837](facebook/react#25837)) //<Ricky>// - **[d69b2cf82](facebook/react@d69b2cf82 )**: [bug fix] revert values in ReactFiberFlags to keep consistency for devtools ([#25832](facebook/react#25832)) //<Mengdi Chen>// - **[645ae2686](facebook/react@645ae2686 )**: [react-www] remove forked bundle ([#25831](facebook/react#25831)) //<Jan Kassens>// - **[d807eb52c](facebook/react@d807eb52c )**: Revert recent hydration changes ([#25812](facebook/react#25812)) //<Andrew Clark>// - **[2ccfa657d](facebook/react@2ccfa657d )**: Fork ReactDOMSharedInternals for www ([#25791](facebook/react#25791)) //<lauren>// - **[f0534ae94](facebook/react@f0534ae94 )**: Avoid replaying SelectiveHydrationException in dev ([#25754](facebook/react#25754)) //<Tianyu Yao>// - **[7fab379d8](facebook/react@7fab379d8 )**: fix link to ReactDOMHostconfig in reconciler docs ([#25788](facebook/react#25788)) //<Dmitry>// - **[500c8aa08](facebook/react@500c8aa08 )**: Add component name to StrictMode error message ([#25718](facebook/react#25718)) //<Samuel Susla>// - **[353c30252](facebook/react@353c30252 )**: Hold host functions in var ([#25741](facebook/react#25741)) //<Samuel Susla>// Changelog: [General][Changed] - React Native sync for revisions 17f6912...48b687f jest_e2e[run_all_tests] Reviewed By: rubennorte Differential Revision: D42855483 fbshipit-source-id: c244a595bb2d490a23b333c1b16d04a459ec94fc
OlimpiaZurek
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May 22, 2023
Summary: This sync includes the following changes: - **[48b687fc9](facebook/react@48b687fc9 )**: [trusted types][www] Add enableTrustedTypesIntegration flag back in ([facebook#26016](facebook/react#26016)) //<an onion>// - **[9b1423cc0](facebook/react@9b1423cc0 )**: Revert "Hold host functions in var" ([facebook#26079](facebook/react#26079)) //<Samuel Susla>// - **[ce09ace9a](facebook/react@ce09ace9a )**: Improve Error Messages when Access Client References ([facebook#26059](facebook/react#26059)) //<Sebastian Markbåge>// - **[0652bdbd1](facebook/react@0652bdbd1 )**: Add flow types to Maps in ReactNativeViewConfigRegistry.js ([facebook#26064](facebook/react#26064)) //<Samuel Susla>// - **[ee8509801](facebook/react@ee8509801 )**: [cleanup] remove deletedTreeCleanUpLevel feature flag ([facebook#25529](facebook/react#25529)) //<Jan Kassens>// - **[0e31dd028](facebook/react@0e31dd028 )**: Remove findDOMNode www shim ([facebook#25998](facebook/react#25998)) //<Jan Kassens>// - **[379dd741e](facebook/react@379dd741e )**: [www] set enableTrustedTypesIntegration to false ([facebook#25997](facebook/react#25997)) //<Jan Kassens>// - **[555ece0cd](facebook/react@555ece0cd )**: Don't warn about concurrently rendering contexts if we finished rendering ([facebook#22797](facebook/react#22797)) //<Sebastian Silbermann>// - **[0fce6bb49](facebook/react@0fce6bb49 )**: [cleanup] remove feature flags warnAboutDefaultPropsOnFunctionComponents and warnAboutStringRefs ([facebook#25980](facebook/react#25980)) //<Jan Kassens>// - **[7002a6743](facebook/react@7002a6743 )**: [cleanup] remove unused values from ReactFeatureFlags.www-dynamic ([facebook#25575](facebook/react#25575)) //<Jan Kassens>// - **[a48e54f2b](facebook/react@a48e54f2b )**: [cleanup] remove old feature flag warnAboutDeprecatedLifecycles ([facebook#25978](facebook/react#25978)) //<Jan Kassens>// - **[0f4a83596](facebook/react@0f4a83596 )**: Remove duplicate JSResourceReferenceImpl mock ([facebook#25976](facebook/react#25976)) //<Jan Kassens>// - **[c49131669](facebook/react@c49131669 )**: Remove unused Flow suppressions ([facebook#25977](facebook/react#25977)) //<Jan Kassens>// - **[afe6521](facebook/react@afe6521e1 )**: Refactor: remove useless parameter ([facebook#25923](facebook/react#25923)) //<Chris>// - **[34464fb16](facebook/react@34464fb16 )**: Upgrade to Flow 0.196.3 ([facebook#25974](facebook/react#25974)) //<Jan Kassens>// - **[e2424f33b](facebook/react@e2424f33b )**: [flow] enable exact_empty_objects ([facebook#25973](facebook/react#25973)) //<Jan Kassens>// - **[0b4f44302](facebook/react@0b4f44302 )**: [flow] enable enforce_local_inference_annotations ([facebook#25921](facebook/react#25921)) //<Jan Kassens>// - **[0b974418c](facebook/react@0b974418c )**: [Fizz] Fork Fizz instruction set for inline script and external runtime ([facebook#25862](facebook/react#25862)) //<mofeiZ>// - **[5379b6123](facebook/react@5379b6123 )**: Batch sync, default and continuous lanes ([facebook#25700](facebook/react#25700)) //<Tianyu Yao>// - **[bbf4d2211](facebook/react@bbf4d2211 )**: Update import for babel-code-frame in build script ([facebook#25963](facebook/react#25963)) //<Ming Ye>// - **[b83baf63f](facebook/react@b83baf63f )**: Transform updates to support Flow this annotation syntax ([facebook#25918](facebook/react#25918)) //<Jan Kassens>// - **[c2d655207](facebook/react@c2d655207 )**: Unify `use` and `renderDidSuspendDelayIfPossible` implementations ([facebook#25922](facebook/react#25922)) //<Andrew Clark>// - **[48274a43a](facebook/react@48274a43a )**: Remove vestigial Suspense batching logic ([facebook#25861](facebook/react#25861)) //<Andrew Clark>// - **[de7d1c907](facebook/react@de7d1c907 )**: Add `fetchPriority` to `<img>` and `<link>` ([facebook#25927](facebook/react#25927)) //<Steven>// - **[81d4ee9ca](facebook/react@81d4ee9ca )**: reconciler docs: fix small typo - "mode" (instead of "node") ([facebook#25863](facebook/react#25863)) //<satelllte>// - **[5fcf1a4b4](facebook/react@5fcf1a4b4 )**: Bugfix: Synchronous ping during render phase sometimes unwinds the stack, leading to crash ([facebook#25851](facebook/react#25851)) //<Andrew Clark>// - **[2b1fb91a5](facebook/react@2b1fb91a5 )**: ESLint upgrade to use hermes-eslint ([facebook#25915](facebook/react#25915)) //<Jan Kassens>// - **[fabef7a6b](facebook/react@fabef7a6b )**: Resubmit Add HydrationSyncLane ([facebook#25878](facebook/react#25878)) //<Tianyu Yao>// - **[7efa9e597](facebook/react@7efa9e597 )**: Fix unwinding context during selective hydration ([facebook#25876](facebook/react#25876)) //<Tianyu Yao>// - **[84a0a171e](facebook/react@84a0a171e )**: Rename experimental useEvent to useEffectEvent ([facebook#25881](facebook/react#25881)) //<Sebastian Markbåge>// - **[4dda96a40](facebook/react@4dda96a40 )**: [react-www] remove forked bundle ([facebook#25866](facebook/react#25866)) //<Jan Kassens>// - **[9c09c1cd6](facebook/react@9c09c1cd6 )**: Revert "Fork ReactDOMSharedInternals for www ([facebook#25791](facebook/react#25791))" ([facebook#25864](facebook/react#25864)) //<lauren>// - **[996e4c0d5](facebook/react@996e4c0d5 )**: Offscreen add attach ([facebook#25603](facebook/react#25603)) //<Samuel Susla>// - **[b14d7fa4b](facebook/react@b14d7fa4b )**: Add support for setNativeProps to Fabric ([facebook#25737](facebook/react#25737)) //<Samuel Susla>// - **[819687279](facebook/react@819687279 )**: [Float] Fix typo in ReactDOMResourceValidation.js ([facebook#25798](facebook/react#25798)) //<Ikko Ashimine>// - **[5dfc485f6](facebook/react@5dfc485f6 )**: fix tests for when float is off ([facebook#25839](facebook/react#25839)) //<Josh Story>// - **[bfcbf3306](facebook/react@bfcbf3306 )**: toString children of title ([facebook#25838](facebook/react#25838)) //<Sebastian Markbåge>// - **[d4bc16a7d](facebook/react@d4bc16a7d )**: Revert "[react-www] remove forked bundle" ([facebook#25837](facebook/react#25837)) //<Ricky>// - **[d69b2cf82](facebook/react@d69b2cf82 )**: [bug fix] revert values in ReactFiberFlags to keep consistency for devtools ([facebook#25832](facebook/react#25832)) //<Mengdi Chen>// - **[645ae2686](facebook/react@645ae2686 )**: [react-www] remove forked bundle ([facebook#25831](facebook/react#25831)) //<Jan Kassens>// - **[d807eb52c](facebook/react@d807eb52c )**: Revert recent hydration changes ([facebook#25812](facebook/react#25812)) //<Andrew Clark>// - **[2ccfa657d](facebook/react@2ccfa657d )**: Fork ReactDOMSharedInternals for www ([facebook#25791](facebook/react#25791)) //<lauren>// - **[f0534ae94](facebook/react@f0534ae94 )**: Avoid replaying SelectiveHydrationException in dev ([facebook#25754](facebook/react#25754)) //<Tianyu Yao>// - **[7fab379d8](facebook/react@7fab379d8 )**: fix link to ReactDOMHostconfig in reconciler docs ([facebook#25788](facebook/react#25788)) //<Dmitry>// - **[500c8aa08](facebook/react@500c8aa08 )**: Add component name to StrictMode error message ([facebook#25718](facebook/react#25718)) //<Samuel Susla>// - **[353c30252](facebook/react@353c30252 )**: Hold host functions in var ([facebook#25741](facebook/react#25741)) //<Samuel Susla>// Changelog: [General][Changed] - React Native sync for revisions 17f6912...48b687f jest_e2e[run_all_tests] Reviewed By: rubennorte Differential Revision: D42855483 fbshipit-source-id: c244a595bb2d490a23b333c1b16d04a459ec94fc
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This code was originally added in the old ExpirationTime implementation of Suspense. The idea is that if multiple updates suspend inside the same Suspense boundary, and both of them resolve, we should render both results in the same batch, to reduce jank.
This was an incomplete idea, though. We later discovered a stronger requirement — once we show a fallback, we cannot fill in that fallback without completing all the updates that were previously skipped over. Otherwise you get tearing. This was fixed by #18411, then we discovered additional related flaws that were addressed in #24685. See those PR descriptions for additional context.
So I believe this older code is no longer necessary.