Sebastian MarkbågeandGitHub
7ac33959f1
This fixes so that you can postpone in a fallback. This postpones the parent boundary. I track the fallbacks in a separate replay node so that when we resume, we can replay the fallback itself and finish the fallback and then possibly later the content. By doing this we also ensure we don't complete the parent too early since now it has a render task on it. There is one case that this surfaces that isn't limited to prerender/resume but also render/hydrateRoot. I left todos in the tests for this. If you postpone in a fallback, and suspend in the content but eventually don't postpone in the content then we should be able to just skip postponing since the content rendered and we no longer need the fallback. This is a bit of a weird edge case though since fallbacks are supposed to be very minimal. This happens because in both cases the fallback starts rendering early as soon as the content suspends. This also ensures that the parent doesn't complete early by increasing the blocking tasks. Unfortunately, the fallback will irreversibly postpone its parent boundary as soon as it hits a postpone. When you suspend, the same thing happens but we typically deal with this by doing a "soft" abort on the fallback since we don't need it anymore which unblocks the parent boundary. We can't do that with postpone right now though since it's considered a terminal state. I think I'll just leave this as is for now since it's an edge case but it's an annoying exception in the model. Makes me feel I haven't quite nailed it just yet.
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.
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React has been designed for gradual adoption from the start, and you can use as little or as much React as you need:
- Use Online Playgrounds to get a taste of React.
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You can use React as a <script> tag from a CDN, or as a react package on npm.
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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. If you're using React as a <script> tag, read this section on integrating JSX; otherwise, the recommended JavaScript toolchains handle it automatically.
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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.