9c6de716d0
* Add suspendIfNeeded API and a global scope to track it Adds a "current" suspense config that gets applied to all updates scheduled during the current scope. I suspect we might want to add other types of configurations to the "batch" so I called it the "batch config". This works across renderers/roots but they won't actually necessarily go into the same batch. * Add the suspenseConfig to all updates created during this scope * Compute expiration time based on the timeout of the suspense config * Track if there was a processed suspenseConfig this render pass We'll use this info to suspend a commit for longer when necessary. * Mark suspended states that should be avoided as a separate flag This lets us track which renders we want to suspend for a short time vs a longer time if possible. * Suspend until the full expiration time if something asked to suspend * Reenable an old test that we can now repro again * Suspend the commit even if it is complete if there is a minimum delay This can be used to implement spinners that don't flicker if the data and rendering is really fast. * Default timeoutMs to low pri expiration if not provided This is a required argument in the type signature but people may not supply it and this is a user facing object. * Rename to withSuspenseConfig and drop the default config This allow opting out of suspending in some nested scope. A lot of time when you use this function you'll use it with high level helpers. Those helpers often want to accept some additional configuration for suspense and if it should suspend at all. The easiest way is to just have the api accept null or a suspense config and pass it through. However, then you have to remember that calling suspendIfNeeded has a default. It gets simpler by just saying tat you can pass the config. You can have your own default in user space. * Track the largest suspense config expiration separately This ensures that if we've scheduled lower pri work that doesn't have a suspenseConfig, we don't consider its expiration as the timeout. * Add basic tests for functionality using each update mechanism * Fix issue when newly created avoided boundary doesn't suspend with delay * Add test for loading indicator with minLoadingDurationMs option
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.
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 Online Playgrounds to get a taste of React.
- Add React to a Website as a
<script>tag in one minute. - Create a New React App if you're looking for a powerful JavaScript toolchain.
You can use React as a <script> tag from a CDN, or as a react package on npm.
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:
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:
function HelloMessage({ name }) {
return <div>Hello {name}</div>;
}
ReactDOM.render(
<HelloMessage name="Taylor" />,
document.getElementById('container')
);
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.
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.
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 which have a relatively limited scope. This is a great place to get started.
License
React is MIT licensed.