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# Summary * This PR adds support for persisting certain settings to device storage, allowing e.g. RN apps to properly patch the console when restarted. * The device storage APIs have signature `getConsolePatchSettings()` and `setConsolePatchSettings(string)`, in iOS, are thin wrappers around the `Library/Settings` turbomodule, and wrap a new TM that uses the `SharedPreferences` class in Android. * Pass device storage getters/setters from RN to DevTools' `connectToDevtools`. The setters are then used to populate values on `window`. Later, the console is patched using these values. * If we receive a notification from DevTools that the console patching fields have been updated, we write values back to local storage. * See https://github.com/facebook/react-native/pull/34903 # How did you test this change? Manual testing, `yarn run test-build-devtools`, `yarn run prettier`, `yarn run flow dom` ## Manual testing setup: ### React DevTools Frontend * Get the DevTools frontend in flipper: * `nvm install -g react-devtools-core`, then replace that package with a symlink to the local package * enable "use globally installed devtools" in flipper * yarn run start in react-devtools, etc. as well ### React DevTools Backend * `yarn run build:backend` in react-devtools-core, then copy-paste that file to the expo app's node_modules directory ### React Native * A local version of React Native can be patched in by modifying an expo app's package.json, as in `"react-native": "rbalicki2/react-native#branch-name"` # Versioning safety * There are three versioned modules to worry about: react native, the devtools frontend and the devtools backend. * The react devtools backend checks for whether a `cachedSettingsStore` is passed from react native. If not (e.g. if React Native is outdated), then no behavior changes. * The devtools backend reads the patched console values from the cached settings store. However, if nothing has been stored, for example because the frontend is outdated or has never synced its settings, then behavior doesn't change. * The devtools frontend sends no new messages. However, if it did send a new message (e.g. "store this value at this key"), and the backend was outdated, that message would be silently ignored.
React · 
React is a JavaScript library for building user interfaces.
- Declarative: React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable, simpler to understand, and easier to debug.
- Component-Based: Build encapsulated components that manage their own state, then compose them to make complex UIs. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep the state out of the DOM.
- Learn Once, Write Anywhere: We don't make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code. React can also render on the server using Node and power mobile apps using React Native.
Learn how to use React in your project.
Installation
React has been designed for gradual adoption from the start, and you can use as little or as much React as you need:
- Use Online Playgrounds to get a taste of React.
- Add React to a Website as a
<script>tag in one minute. - Create a New React App if you're looking for a powerful JavaScript toolchain.
You can use React as a <script> tag from a CDN, or as a react package on npm.
Documentation
You can find the React documentation on the website.
Check out the Getting Started page for a quick overview.
The documentation is divided into several sections:
You can improve it by sending pull requests to this repository.
Examples
We have several examples on the website. Here is the first one to get you started:
import { createRoot } from 'react-dom/client';
function HelloMessage({ name }) {
return <div>Hello {name}</div>;
}
const root = createRoot(document.getElementById('container'));
root.render(<HelloMessage name="Taylor" />);
This example will render "Hello Taylor" into a container on the page.
You'll notice that we used an HTML-like syntax; we call it JSX. JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML. If you're using React as a <script> tag, read this section on integrating JSX; otherwise, the recommended JavaScript toolchains handle it automatically.
Contributing
The main purpose of this repository is to continue evolving React core, making it faster and easier to use. Development of React happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving React.
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.
Good First Issues
To help you get your feet wet and get you familiar with our contribution process, we have a list of good first issues that contain bugs that have a relatively limited scope. This is a great place to get started.
License
React is MIT licensed.