Sebastian Markbåge
18212ca960
Follow up to #33027. This enhances the heuristic so that we accumulate the size of the currently written boundaries. Starting from the size of the root (minus preamble) for the shell. This ensures that if you have many small boundaries they don't all continue to get inlined. For example, you can wrap each paragraph in a document in a Suspense boundary to regain document streaming capabilities if that's what you want. However, one consideration is if it's worth producing a fallback at all. Maybe if it's like `null` it's free but if it's like a whole alternative page, then it's not. It's possible to have completely useless Suspense boundaries such as when you nest several directly inside each other. So this uses a limit of at least 500 bytes of the content itself for it to be worth outlining at all. It also can't be too small because then for example a long list of paragraphs can never be outlined. In the fixture I straddle this limit so some paragraphs are too small to be considered. An unfortunate effect of that is that you can end up with some of them not being outlined which means that they appear out of order. SuspenseList is supposed to address that but it's unfortunate. The limit is still fairly high though so it's unlikely that by default you'd start outlining anything within the viewport at all. I had to reduce the `progressiveChunkSize` by an order of magnitude in my fixture to try it out properly.
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.