Since the very beginning we have had the `progressiveChunkSize` option but we never actually took advantage of it because we didn't count the bytes that we emitted. This starts counting the bytes by taking a pass over the added chunks each time a segment completes. That allows us to outline a Suspense boundary to stream in late even if it is already loaded by the time that back-pressure flow and in a `prerender`. Meaning it gets inserted with script. The effect can be seen in the fixture where if you have large HTML content that can block initial paint (thanks to [`rel="expect"`](https://github.com/facebook/react/pull/33016) but also nested Suspense boundaries). Before this fix, the paint would be blocked until the large content loaded. This lets us paint the fallback first in the case that the raw bytes of the content takes a while to download. You can set it to `Infinity` to opt-out. E.g. if you want to ensure there's never any scripts. It's always set to `Infinity` in `renderToHTML` and the legacy `renderToString`. One downside is that if we might choose to outline a boundary, we need to let its fallback complete. We don't currently discount the size of the fallback but really just consider them additive even though in theory the fallback itself could also add significant size or even more than the content. It should maybe really be considered the delta but that would require us to track the size of the fallback separately which is tricky. One problem with the current heuristic is that we just consider the size of the boundary content itself down to the next boundary. If you have a lot of small boundaries adding up, it'll never kick in. I intend to address that in a follow up. |
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| .codesandbox | ||
| .github | ||
| compiler | ||
| fixtures | ||
| packages | ||
| scripts | ||
| .editorconfig | ||
| .eslintignore | ||
| .eslintrc.js | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .nvmrc | ||
| .prettierignore | ||
| .prettierrc.js | ||
| .watchmanconfig | ||
| babel.config-react-compiler.js | ||
| babel.config-ts.js | ||
| babel.config.js | ||
| CHANGELOG.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| dangerfile.js | ||
| LICENSE | ||
| MAINTAINERS | ||
| package.json | ||
| react.code-workspace | ||
| ReactVersions.js | ||
| README.md | ||
| SECURITY.md | ||
| yarn.lock | ||
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 Quick Start to get a taste of React.
- Add React to an Existing Project to use as little or as much React as you need.
- Create a New React App if you're looking for a powerful JavaScript toolchain.
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:
- Quick Start
- Tutorial
- Thinking in React
- Installation
- Describing the UI
- Adding Interactivity
- Managing State
- Advanced Guides
- API Reference
- Where to Get Support
- Contributing Guide
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.
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.