Files
Jan Kassens ec5dd0ab3a Update Flow to 0.257 (#34253)
After an easy couple version with #34252, this version is less flexible
(and safer) on inferring exported types mainly.

We require to annotate some exported types to differentiate between
`boolean` and literal `true` types, etc.
2025-08-21 13:30:01 -04:00
..
2025-08-21 13:30:01 -04:00

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 />);

Documentation

See https://react.dev/

API

See https://react.dev/reference/react