d177272802
We want to make sure that we can block the reveal of a well designed complete shell reliably. In the Suspense model, client transitions don't have any way to implicitly resolve. This means you need to use Suspense or SuspenseList to explicitly split the document. Relying on implicit would mean you can't add a Suspense boundary later where needed. So we highly encourage the use of them around large content. However, if you have constructed a too large shell (e.g. by not adding any Suspense boundaries at all) then that might take too long to render on the client. We shouldn't punish users (or overzealous metrics tracking tools like search engines) in that scenario. This opts out of render blocking if the shell ends up too large to be intentional and too slow to load. Instead it deopts to showing the content split up in arbitrary ways (browser default). It only does this for SSR, and not client navs so it's not reliable. In fact, we issue an error to `onError`. This error is recoverable in that the document is still produced. It's up to your framework to decide if this errors the build or just surface it for action later. What should be the limit though? There's a trade off here. If this limit is too low then you can't fit a reasonably well built UI within it without getting errors. If it's too high then things that accidentally fall below it might take too long to load. I came up with 512kB of uncompressed shell HTML. See the comment in code for the rationale for this number. TL;DR: Data and theory indicates that having this much content inside `rel="expect"` doesn't meaningfully change metrics. Research of above-the-fold content on various websites indicate that this can comfortable fit all of them which should be enough for any intentional initial paint. |
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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.