073ad6a036
Summary: @public This sync includes the following changes: - **[6bf5e8598](https://github.com/facebook/react/commit/6bf5e8598)**: Fix scheduler setTimeout() re-entrancy check (#14384) //<Brian Vaughn>// - **[7a48c900b](https://github.com/facebook/react/commit/7a48c900b)**: Prevent a v8 deopt when profiling (#14383) //<Brian Vaughn>// - **[f00c2755b](https://github.com/facebook/react/commit/f00c2755b)**: Removed unnecessary externals from Jest bundles (#14372) //<Brian Vaughn>// - **[52bea95cf](https://github.com/facebook/react/commit/52bea95cf)**: Fixed scheduler setTimeout fallback (#14358) //<Brian Vaughn>// - **[1d25aa578](https://github.com/facebook/react/commit/1d25aa578)**: [Fizz] New Server Rendering Infra (#14144) //<Sebastian Markbåge>// - **[f1bf28160](https://github.com/facebook/react/commit/f1bf28160)**: Fix bug in cloneHook (#14364) //<Imre Osswald>// - **[16e120438](https://github.com/facebook/react/commit/16e120438)**: [Fire] Add initial build infrastructure (#14359) //<Dan Abramov>// - **[d14ba87b1](https://github.com/facebook/react/commit/d14ba87b1)**: Validate propTypes for lazy() and memo() and warn about invalid patterns (#14298) //<Dan Abramov>// - **[4f964f09c](https://github.com/facebook/react/commit/4f964f09c)**: Adding isMemo check to react-is package (#14313) //<Jinto Jose>// - **[c2a2d8a53](https://github.com/facebook/react/commit/c2a2d8a53)**: Remove useMutationEffect (#14336) //<Sophie Alpert>// - **[48f1e5b3c](https://github.com/facebook/react/commit/48f1e5b3c)**: Add a null type test for memo (#14325) //<chun shang>// - **[f93f3402f](https://github.com/facebook/react/commit/f93f3402f)**: Make useEffect(async) warning more verbose (#14327) //<Dan Abramov>// - **[ee3ef3a07](https://github.com/facebook/react/commit/ee3ef3a07)**: Fix regression: Errors not emitted in streams (#14314) //<Pelle Wessman>// - **[33f6f5e53](https://github.com/facebook/react/commit/33f6f5e53)**: Remove usage of `fbjs/lib/invariant` in ReactNativeViewConfigRegistry. (#14330) //<Christoph Nakazawa>// - **[686f1060a](https://github.com/facebook/react/commit/686f1060a)**: Publish a local release (canary or stable) to NPM (#14260) //<Brian Vaughn>// - **[7475120ce](https://github.com/facebook/react/commit/7475120ce)**: Prevent deopts from modifying exports object in stable builds (#14309) //<Dan Abramov>// - **[0c7189d92](https://github.com/facebook/react/commit/0c7189d92)**: Fix resolution of outer props with React.memo() (#14312) //<Dan Abramov>// - **[14be29b2b](https://github.com/facebook/react/commit/14be29b2b)**: Add more test coverage for nested memo() (#14311) //<Dan Abramov>// - **[dc0dd4bbf](https://github.com/facebook/react/commit/dc0dd4bbf)**: Use |0 to coerce to number (#14297) //<Dan Abramov>// - **[dd8205cef](https://github.com/facebook/react/commit/dd8205cef)**: List ignored types instead of included types in the stack (#14308) //<Dan Abramov>// - **[a9fdf8a32](https://github.com/facebook/react/commit/a9fdf8a32)**: Warn about reassigning this.props (#14277) //<Dan Abramov>// - **[327cf0ee3](https://github.com/facebook/react/commit/327cf0ee3)**: Fix support for mixing react-dom/server@16.6 and react@<16.6 (#14291) //<Dan Abramov>// - **[c954efa70](https://github.com/facebook/react/commit/c954efa70)**: Remove `import * as` pattern from the codebase (#14282) //<Sebastian Markbåge>// - **[ccb14e270](https://github.com/facebook/react/commit/ccb14e270)**: Fix SSR useCallback in render phase (#14279) //<Dan Abramov>// - **[0e9cb3f5d](https://github.com/facebook/react/commit/0e9cb3f5d)**: Clear fields on unmount of fiber to avoid memory leak (#14276) //<Dominic Gannaway>// - **[592676503](https://github.com/facebook/react/commit/592676503)**: Revert "Clear memoizedState on unmount of fiber to avoid memory leak (#14218)" (#14275) //<Dominic Gannaway>// - **[9b2fb24f9](https://github.com/facebook/react/commit/9b2fb24f9)**: Clear memoizedState on unmount of fiber to avoid memory leak (#14218) //<Dominic Gannaway>// - **[a22fabc2a](https://github.com/facebook/react/commit/a22fabc2a)**: Reduce scheduler serialization overhead (#14249) //<Jason Miller>// - **[21d5f7d32](https://github.com/facebook/react/commit/21d5f7d32)**: Wrap shorthand CSS property collision warning in feature flag (#14245) //<Andrew Clark>// - **[8feeed10d](https://github.com/facebook/react/commit/8feeed10d)**: [scheduler] Remove window.postMessage fallback //<Andrew Clark>// - **[5bce0ef10](https://github.com/facebook/react/commit/5bce0ef10)**: [scheduler] Post to MessageChannel instead of window (#14234) //<Andrew Clark>// - **[f55795c8e](https://github.com/facebook/react/commit/f55795c8e)**: Add regression test for #14188 (#14197) //<Dan Abramov>// - **[b98adb648](https://github.com/facebook/react/commit/b98adb648)**: Simplify CSS shorthand property warning (#14183) //<Sophie Alpert>// - **[f8bfd5868](https://github.com/facebook/react/commit/f8bfd5868)**: fix typo //<Sebastian Markbage>// - **[961eb65b4](https://github.com/facebook/react/commit/961eb65b4)**: Use unique thread ID for each partial render to access Context (#14182) //<Sebastian Markbåge>// - **[1a6ab1e9b](https://github.com/facebook/react/commit/1a6ab1e9b)**: SimpleMemoComponent should warn if a ref is given (#14178) //<Sophie Alpert>// - **[8ae867e6b](https://github.com/facebook/react/commit/8ae867e6b)**: Warn about conflicting style values during updates (#14181) //<Sophie Alpert>// - **[d5e1bf07d](https://github.com/facebook/react/commit/d5e1bf07d)**: Renamed outdated schedule/tracing referecnes (#14177) //<Brian Vaughn>// - **[2dd4ba11e](https://github.com/facebook/react/commit/2dd4ba11e)**: ESlint -> ESLint //<Andrew Clark>// - **[9cc631a53](https://github.com/facebook/react/commit/9cc631a53)**: Don't run danger on bad build (#14143) //<Sophie Alpert>// - **[1034e26fe](https://github.com/facebook/react/commit/1034e26fe)**: Fix typos (#14124) //<Heaven>// - **[5618da49d](https://github.com/facebook/react/commit/5618da49d)**: Fix comment typo (#14156) //<Bartosz Gordon>// - **[9fb919945](https://github.com/facebook/react/commit/9fb919945)**: Add global to ESLint plugin bundle config //<Andrew Clark>// - **[c174f8592](https://github.com/facebook/react/commit/c174f8592)**: Add fb build of ESLint plugin (#14165) //<Andrew Clark>// - **[02e4848e3](https://github.com/facebook/react/commit/02e4848e3)**: Improved suspense support in ReactDOMServer (#14161) //<Alex Taylor>// - **[4b163fee1](https://github.com/facebook/react/commit/4b163fee1)**: Remove errant return assignment (#14164) //<Andrew Clark>// - **[e58ecda9a](https://github.com/facebook/react/commit/e58ecda9a)**: Suspense fuzz tester (#14147) //<Andrew Clark>// - **[7fd1661f8](https://github.com/facebook/react/commit/7fd1661f8)**: Don't warn if an unmounted component is pinged (#14158) //<Andrew Clark>// - **[f9e9913f0](https://github.com/facebook/react/commit/f9e9913f0)**: [Synchronous Suspense] Don't delete children of suspended component (#14157) //<Andrew Clark>// - **[7c560131b](https://github.com/facebook/react/commit/7c560131b)**: Adding logger pri (#14155) //<Nathan Schloss>// - **[3d8bda70e](https://github.com/facebook/react/commit/3d8bda70e)**: Refactor ESLint configuration to enable better IDE integration (#13914) //<Minh Nguyen>// - **[051272f20](https://github.com/facebook/react/commit/051272f20)**: Use Entry in `yarn build ...` Instead of Label (#14148) //<Sebastian Markbåge>// Release Notes: [GENERAL] [FEATURE] [React] - React sync for revisions 3ff2c7c...6bf5e85 Reviewed By: bvaughn Differential Revision: D13288288 fbshipit-source-id: 89a4837a9198c53fc79306933f589ef25d8bb4b6
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.
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.
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
- Discussion: https://discuss.reactjs.org/
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.