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API Reference

React APIs

The React package contains all the APIs necessary to define and use components.

Installation

It is available as react on npm. You can also add React to the page as a <script> tag.

Terminal
npm install react
// Importing a specific API:
import { useState } from 'react';

// Importing all APIs together:
import * as React from 'react';

If you use React on the web, you’ll also need the same version of ReactDOM.

Exports

State

useState

Declares a state variable.

function MyComponent() {
  const [age, setAge] = useState(42);
  // ...

useReducer

Declares a state variable managed with a reducer.

function MyComponent() {
  const [state, dispatch] = useReducer(reducer, { age: 42 });
  // ...

Context

useContext

Reads and subscribes to a context.

function MyComponent() {
  const theme = useContext(ThemeContext);
  // ...

createContext

Creates a context that components can provide or read.

const ThemeContext = createContext('light');

Refs

useRef

Declares a ref.

function MyComponent() {
  const inputRef = useRef(null);
  // ...

This section is incomplete and is still being written!