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* Move createRoot/hydrateRoot to /client We want these APIs ideally to be imported separately from things you might use in arbitrary components (like flushSync). Those other methods are "isomorphic" to how the ReactDOM tree is rendered. Similar to hooks. E.g. importing flushSync into a component that only uses it on the client should ideally not also pull in the entry client implementation on the server. This also creates a nicer parity with /server where the roots are in a separate entry point. Unfortunately, I can't quite do this yet because we have some legacy APIs that we plan on removing (like findDOMNode) and we also haven't implemented flushSync using a flag like startTransition does yet. Another problem is that we currently encourage these APIs to be aliased by /profiling (or unstable_testing). In the future you don't have to alias them because you can just change your roots to just import those APIs and they'll still work with the isomorphic forms. Although we might also just use export conditions for them. For that all to work, I went with a different strategy for now where the real API is in / but it comes with a warning if you use it. If you instead import /client it disables the warning in a wrapper. That means that if you alias / then import /client that will inturn import the alias and it'll just work. In a future breaking changes (likely when we switch to ESM) we can just remove createRoot/hydrateRoot from / and move away from the aliasing strategy. * Update tests to import from react-dom/client * Fix fixtures * Update warnings * Add test for the warning * Update devtools * Change order of react-dom, react-dom/client alias I think the order matters here. The first one takes precedence. * Require react-dom through client so it can be aliased Co-authored-by: Andrew Clark <git@andrewclark.io>
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 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:
function HelloMessage({ name }) {
return <div>Hello {name}</div>;
}
ReactDOM.render(
<HelloMessage name="Taylor" />,
document.getElementById('container')
);
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.