Tim Yung
5c8c5388fc
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/51719 When `Animated` traverses props for instances of `AnimatedNode`, it flattens `props.style` before traversing it so that we correctly ignore any `AnimatedNode` instances that may be shadowed by static values: ``` { style: [ {transform: [{translateX: new Animated.Value(0)}]}, {transform: [{translateX: 100}]}, ], } ``` However, there is a bug that occurs when *every* `AnimatedNode` instance is shadowed. In this case, `AnimatedProps` assumes that there are *no* `AnimatedNode` instances in the entire `props.style`. It then incorrectly operates on the unflattened `props.style`, which *does* have `AnimatedNode` instances. When this is passed to `View`, the `AnimatedNode` instances are encountered and can cause a crash in `processTransform`, as reported by: https://github.com/facebook/react-native/issues/51395 The fix for this was originally attempted by riteshshukla04 in https://github.com/facebook/react-native/pull/51442. This diff reuses the same unit test case, but it applies a different fix that does not involve re-traversing the `props.style` object. The fix is gated behind a feature flag, `alwaysFlattenAnimatedStyles`. This will enable us to validate correctness of the new behavior before enabling it for everyone. (Beyond fixing the bug described above, this also causes styles to flatten more aggressively, so production testing is important to ensure stability.) Changelog: [General][Changed] - Creates a feature flag that changes Animated to no longer produce invalid `props.style` if every `AnimatedNode` instance is shadowed via style flattening. Reviewed By: javache Differential Revision: D75723284 fbshipit-source-id: 504f63e8edf836243d615783e119137a920ad271
React Native
Learn once, write anywhere:
Build mobile apps with React.
Getting Started · Learn the Basics · Showcase · Contribute · Community · Support
React Native brings React's declarative UI framework to iOS and Android. With React Native, you use native UI controls and have full access to the native platform.
- Declarative. React makes it painless to create interactive UIs. Declarative views make your code more predictable and easier to debug.
- Component-Based. Build encapsulated components that manage their state, then compose them to make complex UIs.
- Developer Velocity. See local changes in seconds. Changes to JavaScript code can be live reloaded without rebuilding the native app.
- Portability. Reuse code across iOS, Android, and other platforms.
React Native is developed and supported by many companies and individual core contributors. Find out more in our ecosystem overview.
Contents
- Requirements
- Building your first React Native app
- Documentation
- Upgrading
- How to Contribute
- Code of Conduct
- License
📋 Requirements
React Native apps may target iOS 15.1 and Android 7.0 (API 24) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like Expo can be used to work 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:
📖 Documentation
The full documentation for React Native can be found on our website.
The React Native documentation discusses components, APIs, and topics that are specific to React Native. For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
The source for the React Native documentation and website is hosted on a separate repository, @facebook/react-native-website.
🚀 Upgrading
Upgrading to new versions of React Native may give you access to more APIs, views, developer tools, and other goodies. See the Upgrading Guide for instructions.
React Native releases are discussed in this discussion repo.
👏 How to Contribute
The main purpose of this repository is to continue evolving React Native core. We want to make contributing to this project as easy and transparent as possible, and we are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving React Native.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our Contributing Guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React Native.
Open Source Roadmap
You can learn more about our vision for React Native in the Roadmap.
Good First Issues
We have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Discussions
Larger discussions and proposals are discussed in @react-native-community/discussions-and-proposals.
📄 License
React Native is MIT licensed, as found in the LICENSE file.