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Sebastian Markbåge dcf83f7c2d
Disable ScrollTimeline in Safari (#33499)
Stacked on #33501.

This disables the use of ScrollTimeline when detected in Safari in the
recommended SwipeRecognizer approach. I'm instead using a polyfill using
touch events on iOS.

Safari seems set to [release ScrollTimeline
soon](https://webkit.org/blog/16993/news-from-wwdc25-web-technology-coming-this-fall-in-safari-26-beta/).
Unfortunately it's not really what you'd expect.

First of all, [it's not running in sync with the
scroll](https://bugs.webkit.org/show_bug.cgi?id=288402) which is kind of
its main point. Instead, it is running at 60fps and out of sync with the
scroll just like JS. In fact, it is worse than JS because with JS you
can at least spawn CSS animations that run at 120fps. So our polyfill
can respond to touches at 60fps while gesturing and then run at 120fps
upon release. That's better than with ScrollTimeline.

Second, [there's a bug which interrupts scrolling if you start a
ViewTransition](https://bugs.webkit.org/show_bug.cgi?id=288795) when the
element is being removed as part of that. The element can still respond
to touches so in a polyfill this isn't an issue. But it essentially
makes it useless to use ScrollTimeline with swipe-away gestures.

So we're better off in every scenario by not using it.

The UA detection is a bit unfortunate. Not sure if there's something
more specific but we also had to do a UA detection for Chrome for View
Transitions. Those are the only two we have in all of React.


![safarimeme](https://github.com/user-attachments/assets/d4ca9eba-489e-4ade-b462-2ffeee3a470c)
2025-07-02 17:01:49 -04:00
.codesandbox Build react-server-dom-webpack for codesandbox (#32990) 2025-04-22 22:20:21 +02:00
.github Fix prelease workflows for dry: false (#33582) 2025-06-23 11:47:07 -04:00
compiler [compiler] Consolidate HIRFunction return information (#33640) 2025-06-25 11:10:38 -07:00
fixtures Disable ScrollTimeline in Safari (#33499) 2025-07-02 17:01:49 -04:00
packages [Flight] Use a heuristic to extract a useful description of I/O from the Promise value (#33662) 2025-07-02 16:12:37 -04:00
scripts [react-native] Consume ReactNativeAttributePayloadFabric from ReactNativePrivateInterface (#33616) 2025-06-25 10:23:36 +01:00
.editorconfig Remove trim_trailing_whitespace from editorconfig (#31413) 2024-11-04 15:30:02 -05:00
.eslintignore Fix ESLint and Prettier configs for React Compiler (#29073) 2024-05-15 14:02:57 -07:00
.eslintrc.js Add ScrollTimeline Polyfill for Swipe Recognizer using a new CustomTimeline protocol (#33501) 2025-07-02 16:07:46 -04:00
.git-blame-ignore-revs Add run prettier commit to .git-blame-ignore-revs 2024-07-18 17:42:45 -04:00
.gitattributes .gitattributes to ensure LF line endings when we should 2014-01-17 16:25:53 -08:00
.gitignore [forgive] Init (#31918) 2025-02-25 12:19:11 -05:00
.mailmap updates mailmap entries (#19824) 2020-09-12 13:05:52 -04:00
.nvmrc Upgrade node.js to 20 LTS (#32855) 2025-04-14 12:52:02 -04:00
.prettierignore [prettier] Ignore compiler/target (#31168) 2024-10-10 10:53:27 -04:00
.prettierrc.js [scripts] Switch back to flow parser for prettier (#33414) 2025-06-03 00:00:28 -04:00
.watchmanconfig .watchmanconfig must be valid json (#16118) 2019-07-11 19:01:02 -07:00
babel.config-react-compiler.js feat(eslint-plugin-react-hooks): merge rule from eslint-plugin-react-compiler into react-hooks plugin (#32416) 2025-03-12 21:43:06 -04:00
babel.config-ts.js Update babel configs used in jest (#32588) 2025-03-12 19:07:39 -04:00
babel.config.js Partially revert #32588 (#32621) 2025-03-15 15:21:57 -04:00
CHANGELOG.md Fix typo "Complier" to "Compiler" and remove duplicate issue reference (#33653) 2025-06-26 08:34:45 -07:00
CODE_OF_CONDUCT.md revert last grammatical edit (#25067) 2022-08-10 20:14:31 +01:00
CONTRIBUTING.md Fix: Updated link in CONTRIBUTING (#25381) 2022-10-03 10:29:57 -04:00
dangerfile.js Fix typo in dangerfile.js which results in an unreachable code path… (#32277) 2025-01-31 01:44:02 -05:00
LICENSE [Codemod] Update copyright header to Meta (#25315) 2022-10-18 11:19:24 -04:00
MAINTAINERS Update MAINTAINERS (#32238) 2025-01-27 13:40:45 -06:00
package.json [tests] remove pretest compiler script (#33452) 2025-06-06 09:16:58 -04:00
react.code-workspace created a vscode workspace file for the repo (#29830) 2024-06-13 16:23:42 +01:00
ReactVersions.js [eprh] Bump stable version (#32978) 2025-04-21 14:36:13 -04:00
README.md [ez] Remove circleci badge from readme 2024-07-29 13:26:14 -04:00
SECURITY.md Create SECURITY.md (#15784) 2020-01-09 14:07:41 -08:00
yarn.lock [scripts] Switch back to flow parser for prettier (#33414) 2025-06-03 00:00:28 -04:00

React · GitHub license npm version (Runtime) Build and Test (Compiler) TypeScript PRs Welcome

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:

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.

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.