Upgrade to React 19.0.0 and React Native 0.79.3 #315
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workflow: benchmarks/sizeComparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.
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workflow: benchmarks/perf (native)Comparison of performance test results, measured in operations per second. Larger is better.
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Ignore react-test-renderer deprecation warnings for now. Close #300
React Native removed the 'experimental_layoutConformance' prop from View and introduced the 'experimental_LayoutConformance' component. This new component is expected to wrap any tree that needs to opt into W3C layout. Use of the new component now requires explicit setting of a prop on 'html.*' elements - 'data-layoutconformance="strict"'. This is done to avoid wrapping every `View` in a `LayoutConformance` component, since that now alters the component tree rather than just adding a prop. Adding a prop to RSD elements is also preferred because it avoids two other problems: 1) Developers having to import from 'react-native' in a file that might otherwise be expected to be cross-platform, 2) React Native for Web having to add support for this export to avoid crashing Expo apps (unless using file forks.) The use of another special 'data-*' attribute avoids React DOM warnings about unrecognized properties on web. Fix #245
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Fix for RN flow types facebook/react-native#51908 |
Replace the polyfills with the built-in support for `marginInline`, etc. Close #219
This was referenced Jun 13, 2025
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🎉 RN 0.79.4 is available and fixes the issue with Flow types |
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0.79.4 is still broken New pick request for 0.79.5 should fix it reactwg/react-native-releases#1000 |
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This diff bumps the dep requirements to React Native 0.79.3 and React 19.0.0 (can't use 19.1.0 with React Native 0.79.3). For now, this diff is unmergable because React Native 0.79.3 has broken Flow type exports.
There is also a change to how React Native is configured to use W3C layout conformance. This can no longer be done automatically by RSD and requires the use of a special prop on the root
htmlelement of the app, which will render the necessary React Native component behind the scenes. On web, nothing happens.Some unit tests are also modified to check for RSD-specific warnings and errors, to work around the increase in errors caused by the upgrade to react-test-renderer, which is deprecated for React 19. However, there is no good cross-platform testing alternative at this stage, with the React recommended 3P libraries having incompatible APIs.