Sebastian Markbåge
defffdbba4
This is a follow up to #31930 and a prerequisite for #31975. With View Transitions, the commit phase becomes async which means that other work can sneak in between. We need to be resilient to that. This PR first refactors the flushMutationEffects and flushLayoutEffects to use module scope variables to track its arguments so we can defer them. It shares these with how we were already doing it for flushPendingEffects. We also track how far along the commit phase we are so we know what we have left to flush. Then callers of flushPassiveEffects become flushPendingEffects. That helper synchronously flushes any remaining phases we've yet to commit. That ensure that things are at least consistent if that happens. Finally, when we are using a scheduled task, we don't do any work. This ensures that we're not flushing any work too early if we could've deferred it. This still ensures that we always do flush it before starting any new work on any root so new roots observe the committed state. There are some unfortunate effects that could happen from allowing things to flush eagerly. Such as if a flushSync sneaks in before startViewTransition, it'll skip the animation. If it's during a suspensey font it'll start the transition before the font has loaded which might be better than breaking flushSync. It'll also potentially flush passive effects inside the startViewTransition which should typically be ok.
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.