mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Andrew Clark
a8875eab7f
This fixes a handful of tests that were accidentally relying on React synchronously queuing work in the Scheduler after a setState. Usually this is because they use a lower level SchedulerMock method instead of either `act` or one of the `waitFor` helpers. In some cases, the solution is to switch to those APIs. In other cases, if we're intentionally testing some lower level behavior, we might have to be a bit more clever. Co-authored-by: Tianyu Yao <skyyao@fb.com>
react
React is a JavaScript library for creating user interfaces.
The react package contains only the functionality necessary to define React components. It is typically used together with a React renderer like react-dom for the web, or react-native for the native environments.
Note: by default, React will be in development mode. The development version includes extra warnings about common mistakes, whereas the production version includes extra performance optimizations and strips all error messages. Don't forget to use the production build when deploying your application.
Usage
import { useState } from 'react';
import { createRoot } from 'react-dom/client';
function Counter() {
const [count, setCount] = useState(0);
return (
<>
<h1>{count}</h1>
<button onClick={() => setCount(count + 1)}>
Increment
</button>
</>
);
}
const root = createRoot(document.getElementById('root'));
root.render(<Counter />);