@astrojs/ react

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This Astro integration enables server-side rendering and client-side hydration for your React components.

Installation

Astro includes an astro add command to automate the setup of official integrations. If you prefer, you can install integrations manually instead.

To install @astrojs/react, run the following from your project directory and follow the prompts:

npx astro add react

pnpm astro add react

yarn astro add react

If you run into any issues, feel free to report them to us on GitHub and try the manual installation steps below.

Manual Install

First, install the @astrojs/react package:

npm install @astrojs/react

pnpm add @astrojs/react

yarn add @astrojs/react

Most package managers will install associated peer dependencies as well. If you see a “Cannot find package ‘react’” (or similar) warning when you start up Astro, you’ll need to install react and react-dom:

npm install react react-dom

pnpm add react react-dom

yarn add react react-dom

Then, apply the integration to your astro.config.* file using the integrations property:

import { defineConfig } from 'astro/config';
import react from '@astrojs/react';

export default defineConfig({
  // ...
  integrations: [react()],
});

Getting started

To use your first React component in Astro, head to our UI framework documentation. You’ll explore:

📦 how framework components are loaded,
💧 client-side hydration options, and
🤝 opportunities to mix and nest frameworks together

Options

Combining multiple JSX frameworks

When you are using multiple JSX frameworks (React, Preact, Solid) in the same project, Astro needs to determine which JSX framework-specific transformations should be used for each of your components. If you have only added one JSX framework integration to your project, no extra configuration is needed.

Use the include (required) and exclude (optional) configuration options to specify which files belong to which framework. Provide an array of files and/or folders to include for each framework you are using. Wildcards may be used to include multiple file paths.

We recommend placing common framework components in the same folder (e.g. /components/react/ and /components/solid/) to make specifying your includes easier, but this is not required:

import { defineConfig } from 'astro/config';
import preact from '@astrojs/preact';
import react from '@astrojs/react';
import svelte from '@astrojs/svelte';
import vue from '@astrojs/vue';
import solid from '@astrojs/solid-js';

export default defineConfig({
  // Enable many frameworks to support all different kinds of components.
  // No `include` is needed if you are only using a single JSX framework!
  integrations: [
    preact({
      include: ['**/preact/*'],
    }),
    react({
      include: ['**/react/*'],
    }),
    solid({
      include: ['**/solid/*'],
    }),
  ],
});

Children parsing

Children passed into a React component from an Astro component are parsed as plain strings, not React nodes.

For example, the <ReactComponent /> below will only receive a single child element:

---
import ReactComponent from './ReactComponent';
---

<ReactComponent>
  <div>one</div>
  <div>two</div>
</ReactComponent>

If you are using a library that expects more than one child element to be passed, for example so that it can slot certain elements in different places, you might find this to be a blocker.

You can set the experimental flag experimentalReactChildren to tell Astro to always pass children to React as React virtual DOM nodes. There is some runtime cost to this, but it can help with compatibility.

You can enable this option in the configuration for the React integration:

import { defineConfig } from 'astro/config';
import react from '@astrojs/react';

export default defineConfig({
  // ...
  integrations: [
    react({
      experimentalReactChildren: true,
    }),
  ],
});