f386f831d2
Summary: This was failing due to issues with refs, which we were able to fix and then finally due to some jest tests that were failing due to things being null that shouldn't be which I couldn't easily figure out. Reverting the stack until we can actually solve it, hopefully with additional tests. This was created by running: ``` $ hg backout c2fe2c46e538 fetching tree '' b9bbfc1925c6daf85ba3227d12f177aca9c0c054, based on 4257c76aefa84aaa17279e65aa7ca1174f4401e7, found via 02368b670953 connected to hg015.frc2.facebook.com 60 trees fetched over 2.91s fetching tree '' c3c304df13399f0f1a29a668242da454fc1d8a97, based on b9bbfc1925c6daf85ba3227d12f177aca9c0c054, found via c2fe2c46e538 7 trees fetched over 0.03s 1 files updated, 0 files merged, 0 files removed, 0 files unresolved commit 4270328:50a65c5c2e27 backs out commit 4266783:c2fe2c46e538 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over 0.57s [twsvcscm@sandcastle3265.ftw1 /data/sandcastle/boxes/instance-ide/xplat/js (50a65c5)]$ hg backout 02368b670953 fetching tree '' a46c8ca065f5b92cf375d7ed899fc5ca268ba4da, based on b9bbfc1925c6daf85ba3227d12f177aca9c0c054, found via bade4285eafb connected to hg024.frc2.facebook.com 27 trees fetched over 3.21s fetching tree '' 361548a090e81d18bab6f4fc16036c518cb4d7c1, based on a46c8ca065f5b92cf375d7ed899fc5ca268ba4da, found via bade4285eafb 41 trees fetched over 0.10s merging react-native-github/Libraries/Components/TextInput/TextInput.js 8 files updated, 1 files merged, 0 files removed, 0 files unresolved commit 4270329:dbaca0daf0ac backs out commit 4266782:02368b670953 14 files fetched over 7 fetches - (14 misses, 0.00% hit ratio) over 1.72s [twsvcscm@sandcastle3265.ftw1 /data/sandcastle/boxes/instance-ide/xplat/js (dbaca0d)]$ hg backout bade4285eafb connected to hg030.frc2.facebook.com fetching tree '' 1b4a17164fdbfcad40139e46da4a9bfa8aa8def3, based on 361548a090e81d18bab6f4fc16036c518cb4d7c1, found via 5cfb25344385 7 trees fetched over 0.06s merging react-native-github/Libraries/Components/TextInput/TextInput.js 20 files updated, 1 files merged, 0 files removed, 0 files unresolved commit 4270330:2951740e5b32 backs out commit 4266781:bade4285eafb 33 files fetched over 14 fetches - (33 misses, 0.00% hit ratio) over 4.50s [twsvcscm@sandcastle3265.ftw1 /data/sandcastle/boxes/instance-ide/xplat/js (2951740)]$ hg backout 5cfb25344385 connected to hg035.frc2.facebook.com merging react-native-github/Libraries/Components/TextInput/TextInput.js 0 files updated, 1 files merged, 2 files removed, 0 files unresolved commit 4270331:fffb4629a397 backs out commit 4266780:5cfb25344385 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over 4.03s ``` Reviewed By: yungsters Differential Revision: D12989604 fbshipit-source-id: 703a7c9c1f5bdd710077e515bdff06fdb34502ec
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.