Remove Numeric Fallback of Symbols #23348
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Comparing: 4035157...7a41dde Critical size changesIncludes critical production bundles, as well as any change greater than 2%:
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Object.assign is a similar one I guess |
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Sweet. I remember some nasty issues in the past when debugging IE 11 issues where Symbol polyfills were loaded in between React modules. Some modules ended up with the fallback and some without resulting in odd errors. At least now we have a clear message when Symbol is missing. I believe most frameworks polyfill Symbol anyway for Array.from. This should be added to https://reactjs.org/docs/javascript-environment-requirements.html though just in case. |
Let's drop it in 18? I don't see good reason to wait. |
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This was already defeating the XSS issue that Symbols was meant to protect against. So you were already supposed to use a polyfill for security. We rely on real Symbol.for in Flight for Server Components so those require real symbols anyway. We also don't really support IE without additional polyfills anyway.
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acdlite
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Feb 23, 2022
facebook-github-bot
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Summary: This sync includes the following changes: - **[17806594c](facebook/react@17806594c )**: Move createRoot/hydrateRoot to react-dom/client ([#23385](facebook/react#23385)) //<Sebastian Markbåge>// - **[75662d6a7](facebook/react@75662d6a7 )**: Remove hacky stream.locked check, declare as byte stream instead ([#23387](facebook/react#23387)) //<Sebastian Markbåge>// - **[a82ef6d40](facebook/react@a82ef6d40 )**: Add back skipUnmountedBoundaries flag only for www ([#23383](facebook/react#23383)) //<Andrew Clark>// - **[f468816ef](facebook/react@f468816ef )**: Fix false positive hydration warnings ([#23364](facebook/react#23364)) //<Andrew Clark>// - **[5d08a24c2](facebook/react@5d08a24c2 )**: useId: Use 'H' to separate main id from hook index ([#23363](facebook/react#23363)) //<Andrew Clark>// - **[3a60844a0](facebook/react@3a60844a0 )**: Update error message for suspending at sync priority ([#23361](facebook/react#23361)) //<Andrew Clark>// - **[efe4121ee](facebook/react@efe4121ee )**: Add : to beginning and end of every useId ([#23360](facebook/react#23360)) //<Andrew Clark>// - **[42f15b324](facebook/react@42f15b324 )**: [DevTools][Transition Tracing] onTransitionComplete and onTransitionStart implmentation ([#23313](facebook/react#23313)) //<Luna Ruan>// - **[a5b22155c](facebook/react@a5b22155c )**: Warn if renderSubtreeIntoContainer is called ([#23355](facebook/react#23355)) //<Andrew Clark>// - **[52c393b5d](facebook/react@52c393b5d )**: Revert to client render on text mismatch ([#23354](facebook/react#23354)) //<Andrew Clark>// - **[1ad8d8129](facebook/react@1ad8d8129 )**: Remove object-assign polyfill ([#23351](facebook/react#23351)) //<Sebastian Markbåge>// - **[b3f3da205](facebook/react@b3f3da205 )**: Land warnOnSubscriptionInsideStartTransition flag ([#23353](facebook/react#23353)) //<Andrew Clark>// - **[990098f88](facebook/react@990098f88 )**: Re-arrange main ReactFeatureFlags module ([#23350](facebook/react#23350)) //<Andrew Clark>// - **[1f3f6db73](facebook/react@1f3f6db73 )**: Remove createMutableSource from stable exports ([#23352](facebook/react#23352)) //<Andrew Clark>// - **[587e75930](facebook/react@587e75930 )**: Remove Numeric Fallback of Symbols ([#23348](facebook/react#23348)) //<Sebastian Markbåge>// - **[40351575d](facebook/react@40351575d )**: Split writeChunk into void and return value ([#23343](facebook/react#23343)) //<Sebastian Markbåge>// - **[2c693b2de](facebook/react@2c693b2de )**: Re-add reentrancy avoidance ([#23342](facebook/react#23342)) //<Sebastian Markbåge>// - **[1760b27c0](facebook/react@1760b27c0 )**: Remove ./src/* export from public build ([#23262](facebook/react#23262)) //<Andrew Clark>// - **[552c067bb](facebook/react@552c067bb )**: Remove public export for unstable-shared-subset.js ([#23261](facebook/react#23261)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 4de99b3...1780659 jest_e2e[run_all_tests] Reviewed By: rickhanlonii Differential Revision: D34552175 fbshipit-source-id: f1c831a45f96d335a20c3b4113196e0a42cefc03
salazarm
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Mar 17, 2022
This reverts commit 587e759.
salazarm
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Mar 17, 2022
This reverts commit 587e759.
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This was already defeating the XSS issue that Symbols was meant to protect against. So you were already supposed to use a polyfill for security.
We rely on real Symbol.for in Flight for Server Components so those require real symbols anyway.
We also don't really support IE without additional polyfills anyway.