Andrew Clark
2e4663f616
* Split performWork into renderRoot and commitRoot It turns out that the scheduler is too coupled to how the DOM renderer works. Specifically, the requestIdleCallback model, and how roots are committed immediately after completing. Other renderers have different constraints for when to yield and when to commit work. We're moving towards a model where the scheduler only works on a single root at a time, and the render phase and commit phase are split into distinct entry points. This gives the renderer more control over when roots are committed, coordinating multiple roots, deferring the commit phase, batching updates, when to yield execution, and so on. In this initial commit, I've left the renderers alone and only changed the scheduler. Mostly, this involved extracting logic related to multiple roots and moving it into its own section at the bottom of the file. The idea is that this section can be lifted pretty much as-is into the renderers. I'll do that next. * Remove FiberRoot scheduleAt Isn't actually used anywhere * Make the root schedule a linked list again Since this still lives inside the renderer, let's just use the FiberRoot type. The FiberRoot concept will likely be lifted out eventually, anyway. * commitRoot should accept a HostRoot This way it's less reliant on the alternate model * Unify branches * Remove dead branch onUncaughtError is only called while we're working on a root. * remainingWork -> remainingExpirationTime I was wary of leaking NoWork but mixing numbers and null is worse so let's just do it until we think of something better. * Rename stuff
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 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 own project.
Examples
We have several examples on the website. Here is the first one to get you started:
class HelloMessage extends React.Component {
render() {
return <div>Hello {this.props.name}</div>;
}
}
ReactDOM.render(
<HelloMessage name="John" />,
document.getElementById('container')
);
This example will render "Hello John" 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. We recommend using Babel with a React preset to convert JSX into native JavaScript for browsers to digest.
Installation
React is available as the react package on npm. It is also available on a CDN.
React is flexible and can be used in a variety of projects. You can create new apps with it, but you can also gradually introduce it into an existing codebase without doing a rewrite.
The recommended way to install React depends on your project. Here you can find short guides for the most common scenarios:
Contributing
The main purpose of this repository is to continue to evolve 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.
Beginner Friendly Bugs
To help you get your feet wet and get you familiar with our contribution process, we have a list of beginner friendly bugs that contain bugs which are fairly easy to fix. This is a great place to get started.
License
React is MIT licensed.