ccefc700d0
Summary: allow-large-files This sync includes the following changes: - **[45fc46bfa](https://github.com/facebook/react/commit/45fc46bfa )**: 16.8.1 packages //<Brian Vaughn>// - **[f2e2637c8](https://github.com/facebook/react/commit/f2e2637c8 )**: Backwards compat fix for ReactCurrentDispatcher on older react versions (#14770) //<Brian Vaughn>// - **[1107b9673](https://github.com/facebook/react/commit/1107b9673 )**: [TestUtils.act] warn when using TestUtils.act in node (#14768) //<Sunil Pai>// - **[0975ea327](https://github.com/facebook/react/commit/0975ea327 )**: eslint-plugin-react-hooks v1.0.0 //<Brian Vaughn>// - **[bc9818f24](https://github.com/facebook/react/commit/bc9818f24 )**: Scheduler.unstable_next (#14756) //<Andrew Clark>// - **[ce6ecd3fb](https://github.com/facebook/react/commit/ce6ecd3fb )**: Add 16.8.0 changelog and update some READMEs (#14692) //<Dan Abramov>// - **[008a2ab9c](https://github.com/facebook/react/commit/008a2ab9c )**: 16.8.0 //<Brian Vaughn>// - **[d1326f466](https://github.com/facebook/react/commit/d1326f466 )**: [TestUtils.act] fix return result checking (#14758) //<Sunil Pai>// - **[267ed9814](https://github.com/facebook/react/commit/267ed9814 )**: expose `TestUtils.act()` for batching actions in tests (#14744) //<Sunil Pai>// - **[fb3f7bfde](https://github.com/facebook/react/commit/fb3f7bfde )**: Avoid importing Scheduler directly (#14757) //<Andrew Clark>// - **[e602b5291](https://github.com/facebook/react/commit/e602b5291 )**: Use SameValue instead of === to check for dispatchAction equivalence (#14752) //<Jessica Franco>// - **[e489c3f9c](https://github.com/facebook/react/commit/e489c3f9c )**: Update the version with Hooks proposal in README (#14751) //<SToneX>// - **[c21c41ecf](https://github.com/facebook/react/commit/c21c41ecf )**: Tweak invalid Hook warning and error (#14747) //<Dan Abramov>// - **[fec00a869](https://github.com/facebook/react/commit/fec00a869 )**: Typo in comment (#14739) //<Deniz Susman>// - **[66eb29374](https://github.com/facebook/react/commit/66eb29374 )**: Restrict effect return type to a function or nothing (#14119) //<Andrew Clark>// - **[51c07912a](https://github.com/facebook/react/commit/51c07912a )**: Warn when second argument is passed to useCallback (#14729) //<Dan Abramov>// - **[70d407583](https://github.com/facebook/react/commit/70d407583 )**: Move Hook mismatch warning to first mismatch site (#14720) //<Andrew Clark>// - **[ba6477aa3](https://github.com/facebook/react/commit/ba6477aa3 )**: Improve Reducer Hook's lazy init API (#14723) //<Andrew Clark>// - **[cb1ff430e](https://github.com/facebook/react/commit/cb1ff430e )**: Phased dispatcher (#14701) //<Andrew Clark>// - **[9d483dcfd](https://github.com/facebook/react/commit/9d483dcfd )**: Spelling abitrarily -> arbitrarily (#14710) //<Peter Donald>// - **[e19c9e106](https://github.com/facebook/react/commit/e19c9e106 )**: Fix issue with multiple code branches in hooks linter (#14661) //<Yurick>// - **[f11a9c1cb](https://github.com/facebook/react/commit/f11a9c1cb )**: State update bug in concurrent mode (#14698) //<Brian Vaughn>// - **[e679a4b6e](https://github.com/facebook/react/commit/e679a4b6e )**: Fix typo in code comment (#14696) //<Greg Hurrell>// - **[8bcc88f2e](https://github.com/facebook/react/commit/8bcc88f2e )**: Make all readContext() and Hook-in-a-Hook checks DEV-only (#14677) //<Dan Abramov>// - **[6cb26774e](https://github.com/facebook/react/commit/6cb26774e )**: Enable hooks! (#14679) //<Brian Vaughn>// - **[73962c366](https://github.com/facebook/react/commit/73962c366 )**: Revert "Revert "Double-render function components with Hooks in DEV in StrictMode" (#14652)" (#14654) //<Dan Abramov>// - **[994439228](https://github.com/facebook/react/commit/994439228 )**: Put DEV-only code into DEV blocks (#14673) //<Dan Abramov>// - **[f0befae65](https://github.com/facebook/react/commit/f0befae65 )**: Tweak context invariant message (#14671) //<Dan Abramov>// - **[a129259ad](https://github.com/facebook/react/commit/a129259ad )**: Disallow reading context during useMemo etc (#14653) //<Dan Abramov>// - **[c068d31cc](https://github.com/facebook/react/commit/c068d31cc )**: Add unit tests for concurrent mode event dispatching (#14415) //<Sebastian Markbåge>// - **[38247cba3](https://github.com/facebook/react/commit/38247cba3 )**: --save is no longer needed (#14302) //<SamCortopassi>// - **[3f0bcaf0d](https://github.com/facebook/react/commit/3f0bcaf0d )**: Importing React for the first example. (#14346) //<Ramón Chancay Ortega>// - **[ecd919a2f](https://github.com/facebook/react/commit/ecd919a2f )**: RFC: warn when returning different hooks on subsequent renders (#14585) //<Sunil Pai>// - **[3fbebb2a0](https://github.com/facebook/react/commit/3fbebb2a0 )**: Revert "Double-render function components with Hooks in DEV in StrictMode" (#14652) //<Dan Abramov>// - **[5fce6488c](https://github.com/facebook/react/commit/5fce6488c )**: Revert "Disallow reading context during useMemo etc" (#14651) //<Dan Abramov>// - **[fe2ecd276](https://github.com/facebook/react/commit/fe2ecd276 )**: Add test coverage for readContext() on the server (#14649) //<Dan Abramov>// - **[8f45a7fdc](https://github.com/facebook/react/commit/8f45a7fdc )**: Warn about incorrect use of useImperativeHandle() (#14647) //<Dan Abramov>// - **[1fcbd2243](https://github.com/facebook/react/commit/1fcbd2243 )**: Disallow reading context during useMemo etc (#14648) //<Dan Abramov>// - **[2a084f51a](https://github.com/facebook/react/commit/2a084f51a )**: Warn about refs on lazy function components (#14645) //<Dan Abramov>// - **[b5a3df6e8](https://github.com/facebook/react/commit/b5a3df6e8 )**: Fix typo (#14560) //<Linchengyi>// - **[9c146e675](https://github.com/facebook/react/commit/9c146e675 )**: fix typo (#14316) //<liunian>// - **[baa6d40fc](https://github.com/facebook/react/commit/baa6d40fc )**: Mention forwardRef() in <Fn ref={...} /> errors and warnings (#14644) //<Dan Abramov>// - **[a1414e894](https://github.com/facebook/react/commit/a1414e894 )**: Double-render function components with Hooks in DEV in StrictMode (#14643) //<Dan Abramov>// - **[10a7a5b5c](https://github.com/facebook/react/commit/10a7a5b5c )**: Fix synchronous thenable rejection (#14633) //<Dan Abramov>// - **[a2fa6eb98](https://github.com/facebook/react/commit/a2fa6eb98 )**: Move lazy._result assignment (#14632) //<Dan Abramov>// - **[9120f6c2d](https://github.com/facebook/react/commit/9120f6c2d )**: Support sync thenables for lazy() (#14626) //<Dan Abramov>// - **[b66e6e41e](https://github.com/facebook/react/commit/b66e6e41e )**: Add directory details to the package.json of all packages (#14628) //<Grey Baker>// - **[177fb7635](https://github.com/facebook/react/commit/177fb7635 )**: Warn when second callback is passed to setState/dispatch in Hooks (#14625) //<Dan Abramov>// - **[d17d0b99c](https://github.com/facebook/react/commit/d17d0b99c )**: Use public context.report interface in eslint rules (#14623) //<Sebastian Silbermann>// - **[4f332885a](https://github.com/facebook/react/commit/4f332885a )**: Fix shallow renderer set instance state after gDSFP before calling sCU (#14613) //<Yi-Shan, Chen>// - **[e1cd83e49](https://github.com/facebook/react/commit/e1cd83e49 )**: Throw an error when using hooks inside useMemo/useState/useReducer, or .memo's comparator (#14608) //<Sunil Pai>// - **[be457ca68](https://github.com/facebook/react/commit/be457ca68 )**: Small tweaks to SSR to match #14594 (#14618) //<Dan Abramov>// - **[17d70df91](https://github.com/facebook/react/commit/17d70df91 )**: Warn when mixing createRoot() and old APIs (#14615) //<Dan Abramov>// - **[4feab7fc9](https://github.com/facebook/react/commit/4feab7fc9 )**: Add hooks support to ReactShallowRenderer (#14567) //<Dominic Gannaway>// - **[1454a8be0](https://github.com/facebook/react/commit/1454a8be0 )**: Don't bother comparing constructor when deps are not provided (#14594) //<Andrew Clark>// - **[71b64d521](https://github.com/facebook/react/commit/71b64d521 )**: Warn if number of hooks increases (#14591) //<Andrew Clark>// - **[790c8ef04](https://github.com/facebook/react/commit/790c8ef04 )**: Allow useReducer to bail out of rendering by returning previous state (#14569) //<Andrew Clark>// - **[7ab8a8e97](https://github.com/facebook/react/commit/7ab8a8e97 )**: Added Flow type to keep hooks dispatchers in-sync (#14599) //<Brian Vaughn>// - **[4392e3821](https://github.com/facebook/react/commit/4392e3821 )**: useDebugValue should throw if used in a class component (#14601) //<Brian Vaughn>// - **[153a0b598](https://github.com/facebook/react/commit/153a0b598 )**: Add noop useDebugValue hook to partial/server renderer (#14597) //<Brian Vaughn>// - **[7ad9806d1](https://github.com/facebook/react/commit/7ad9806d1 )**: Tweak to avoid property read (#14593) //<Brandon Dail>// - **[0fc154751](https://github.com/facebook/react/commit/0fc154751 )**: Avoid new Set([iterable]) for thenables (#14592) //<Brandon Dail>// - **[edb1f5956](https://github.com/facebook/react/commit/edb1f5956 )**: Support configurable labels for custom hooks (#14559) //<Brian Vaughn>// - **[3e15b1c69](https://github.com/facebook/react/commit/3e15b1c69 )**: make a fork for ReactCurrentDispatcher (#14588) //<Sunil Pai>// - **[0005d1e3f](https://github.com/facebook/react/commit/0005d1e3f )**: Fix typo (#14576) //<Carl Mungazi>// - **[f290138d3](https://github.com/facebook/react/commit/f290138d3 )**: react-debug-tools accepts currentDispatcher ref as param (#14556) //<Brian Vaughn>// - **[b4ad8e947](https://github.com/facebook/react/commit/b4ad8e947 )**: rename useImperativeMethods -> useImperativeHandle (#14565) //<Sunil Pai>// - **[ab03e3d65](https://github.com/facebook/react/commit/ab03e3d65 )**: Inject ReactCurrentDispatcher ref to DevTools (#14550) //<Brian Vaughn>// - **[19ef0ec11](https://github.com/facebook/react/commit/19ef0ec11 )**: Separate current owner and dispatcher (#14548) //<Brian Vaughn>// - **[a9b035b0c](https://github.com/facebook/react/commit/a9b035b0c )**: Separate Object.is polyfill (#14334) //<Maksim Markelov>// - **[547e059f0](https://github.com/facebook/react/commit/547e059f0 )**: Simplify wording of key warning (#14503) //<Sophie Alpert>// - **[3494ee57e](https://github.com/facebook/react/commit/3494ee57e )**: Update ReactUpdateQueue.js (#14521) //<Carl Mungazi>// - **[659c13963](https://github.com/facebook/react/commit/659c13963 )**: Update ReactFiberScheduler.js (#14477) //<Carl Mungazi>// - **[c695b2384](https://github.com/facebook/react/commit/c695b2384 )**: React v16.7.0 //<Andrew Clark>// - **[1c5aa2f23](https://github.com/facebook/react/commit/1c5aa2f23 )**: Move SchedulerFeatureFlags fork to src directory to fix lint //<Andrew Clark>// - **[653bc582f](https://github.com/facebook/react/commit/653bc582f )**: Create separate SchedulerFeatureFlags instead of using ReactFeatureFlags (#14455) //<Andrew Clark>// - **[8bfef0da5](https://github.com/facebook/react/commit/8bfef0da5 )**: Make scheduler debugging feature flag static //<Andrew Clark>// - **[4a1072194](https://github.com/facebook/react/commit/4a1072194 )**: Memoize promise listeners to prevent exponential growth (#14429) //<Andrew Clark>// - **[535804f5c](https://github.com/facebook/react/commit/535804f5c )**: Removed Fabric-specific feature flag files and updated Rollup to use the (non-Fabric) React Native flag files. (#14437) //<Brian Vaughn>// - **[2743fb7b2](https://github.com/facebook/react/commit/2743fb7b2 )**: Enable hooks by default for FB React Native renderer (#14435) //<Brian Vaughn>// - **[7325ebe4d](https://github.com/facebook/react/commit/7325ebe4d )**: Inject overrideProps() fn to DevTools (#14427) //<Brian Vaughn>// - **[a22880e5e](https://github.com/facebook/react/commit/a22880e5e )**: Add support for Suspense & lazy() to the react-is package (#14423) //<Pleun Vanderbauwhede>// - **[947bddd5c](https://github.com/facebook/react/commit/947bddd5c )**: Remove redundant argument of getPlugins function (#14419) //<Heaven>// - **[8df4d59be](https://github.com/facebook/react/commit/8df4d59be )**: Implement pauseExecution, continueExecution, dumpQueue for Scheduler (#14053) //<Kevin Chavez>// - **[5bb4ad737](https://github.com/facebook/react/commit/5bb4ad737 )**: Added ErrorBoundary tests for useEffect and useLayoutEffect (#14401) //<Brian Vaughn>// - **[98eb5ae53](https://github.com/facebook/react/commit/98eb5ae53 )**: TestRenderer toJSON should not expose the Array wrapper Suspense uses for hidden trees (#14392) //<Brian Vaughn>// - **[39489e767](https://github.com/facebook/react/commit/39489e767 )**: Enable hooks in fabric (#14301) //<Spencer Ahrens>// - **[1dc108e58](https://github.com/facebook/react/commit/1dc108e58 )**: Tweaked wording for v8 "performance cliff" issue //<Brian Vaughn>// Release Notes: [GENERAL] [Changed] - React sync for revisions 6bf5e85...aa94237 (React 16.8.1) Pull Request resolved: https://github.com/facebook/react-native/pull/23320 Reviewed By: rickhanlonii Differential Revision: D13976467 fbshipit-source-id: 4ce198e86a54658e1c35aa36bffe4a7dc2956a2e |
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README.md
React Native · 
Learn once, write anywhere: Build mobile apps with React.
See the official React Native website for an introduction to React Native.
Requirements
Supported target operating systems are >= Android 4.1 (API 16) and >= iOS 9.0. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS by default (tools like Expo can be used to get around this).
Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
How React Native works
React Native lets you build mobile apps using JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components.
With React Native, you don't build a "mobile web app", an "HTML5 app", or a "hybrid app". You build a real mobile app that's indistinguishable from an app built using Objective-C, Java, Kotlin, or Swift. React Native uses the same fundamental UI building blocks as regular iOS and Android apps. You just put those building blocks together using JavaScript and React.
React Native lets you build your app faster. Instead of recompiling, you can reload your app instantly. With hot reloading, you can even run new code while retaining your application state.
React Native combines smoothly with components written in Objective-C, Java, Kotlin, or Swift. It's simple to drop down to native code if you need to optimize a few aspects of your application. It's also easy to build part of your app in React Native, and part of your app using native code directly - that's how the Facebook app works.
The focus of React Native is on developer efficiency across all the platforms you care about - learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue investing in React Native. You can learn more about our open source roadmap in this blog post: Open Source Roadmap.
Full documentation
The full documentation for React Native can be found on our website. The source for the React Native documentation and website is hosted on a separate repo, https://github.com/facebook/react-native-website. Releases are discussed in the React Native Community, https://github.com/react-native-community/react-native-releases, and larger discussions and proposals are in https://github.com/react-native-community/discussions-and-proposals.
The React Native documentation only discusses the components, APIs, and topics specific to React Native (React on iOS and Android). For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
Join the React Native community
- Website: https://facebook.github.io/react-native
- Twitter: https://twitter.com/reactnative
- Help: https://facebook.github.io/react-native/en/help
See the CONTRIBUTING file for how to help out.
License
React Native is MIT licensed, as found in the LICENSE file.
React Native documentation is Creative Commons licensed, as found in the LICENSE-docs file.