React#

In this document, you will learn how to build a React application using Rsbuild.

Create React Project#

You can use create-rsbuild to create a project with Rsbuild + React. Just execute the following command:

npm create rsbuild@latest

Then select React when prompted to "Select framework".

Use React in an existing project#

To compile React, you need to register the Rsbuild React Plugin. The plugin will automatically add the necessary configuration for React builds.

For example, register in rsbuild.config.ts:

import { defineConfig } from '@rsbuild/core';
import { pluginReact } from '@rsbuild/plugin-react';

export default defineConfig({
  plugins: [pluginReact()],
});

Use SVGR#

Rsbuild supports convert SVG to React components via SVGR.

If you need to use svgr, you also need to register the SVGR plugin.

React Fast Refresh#

Rsbuild uses React's official Fast Refresh capability to perform component hot updates.

Note that React Refresh requires components to be written according to the standards. Otherwise HMR may not work. You can use eslint-plugin-react-refresh for validation.

For example, if the hot update of the React component cannot take effect, or the state of the React component is lost after the hot update, it is usually because your React component uses an anonymous function. In the official practice of React Fast Refresh, it is required that the component cannot be an anonymous function, otherwise the state of the React component cannot be preserved after hot update.

Here are some examples of wrong usage:

// bad
export default function () {
  return <div>Hello World</div>;
}

// bad
export default () => <div>Hello World</div>;

The correct usage is to declare a name for each component function:

// good
export default function MyComponent() {
  return <div>Hello World</div>;
}

// good
const MyComponent = () => <div>Hello World</div>;

export default MyComponent;

React Compiler#

React Compiler is an experimental compiler introduced in React 19 that can automatically optimize your React code.

Before you start using React Compiler, it's recommended to read the React Compiler documentation to understand the functionality, current state, and usage of the React Compiler.

How to use#

The steps to use React Compiler in Rsbuild:

1. Upgrade versions of react and react-dom to 19.
2. React Compiler currently only provides a Babel plugin, you need to install @rsbuild/plugin-babel and babel-plugin-react-compiler.
3. Register the Babel plugin in your Rsbuild config file:

import { defineConfig } from '@rsbuild/core';
import { pluginBabel } from '@rsbuild/plugin-babel';
import { pluginReact } from '@rsbuild/plugin-react';

export default defineConfig({
  plugins: [
    pluginReact(),
    pluginBabel({
      include: /\.(?:jsx|tsx)$/,
      babelLoaderOptions(opts) {
        opts.plugins?.unshift('babel-plugin-react-compiler');
      },
    }),
  ],
});

You can also refer to the example project.

Configuration#

Set the config for React Compiler as follows

import { defineConfig } from '@rsbuild/core';
import { pluginBabel } from '@rsbuild/plugin-babel';
import { pluginReact } from '@rsbuild/plugin-react';

const ReactCompilerConfig = {
  /* ... */
};

export default defineConfig({
  plugins: [
    pluginReact(),
    pluginBabel({
      include: /\.(?:jsx|tsx)$/,
      babelLoaderOptions(opts) {
        opts.plugins?.unshift([
          'babel-plugin-react-compiler',
          ReactCompilerConfig,
        ]);
      },
    }),
  ],
});

CSS-in-JS#

Use styled-components#

Rsbuild supports compiling styled-components, improve the debugging experience and add server-side rendering support to styled-components.

If you need to use styled-components, We recommend register the Styled Components plugin.

You can refer to this example: styled-components.

Using Emotion#

Rsbuild supports compiling Emotion, you can add the following configuration to use:

• swcReactOptions.importSource
• @swc/plugin-emotion

import { defineConfig } from '@rsbuild/core';
import { pluginReact } from '@rsbuild/plugin-react';

export default defineConfig({
  plugins: [
    pluginReact({
      swcReactOptions: {
        importSource: '@emotion/react',
      },
    }),
  ],
  tools: {
    swc: {
      jsc: {
        experimental: {
          plugins: [['@swc/plugin-emotion', {}]],
        },
      },
    },
  },
});

You can refer to this example: emotion.

Use styled-jsx#

You can use styled-jsx through @swc/plugin-styled-jsx:

import { defineConfig } from '@rsbuild/core';
import { pluginReact } from '@rsbuild/plugin-react';

export default defineConfig({
  plugins: [pluginReact()],
  tools: {
    swc: {
      jsc: {
        experimental: {
          plugins: [['@swc/plugin-styled-jsx', {}]],
        },
      },
    },
  },
});

Please note, you must select the SWC plugin that matches the current version of @swc/core for SWC to work, see tools.swc.

You can refer to this example: styled-jsx.

Use vanilla-extract#

Rsbuild supports @vanilla-extract/webpack-plugin. You can add the following config to use vanilla-extract:

import { defineConfig } from '@rsbuild/core';
import { pluginReact } from '@rsbuild/plugin-react';
import { VanillaExtractPlugin } from '@vanilla-extract/webpack-plugin';

export default defineConfig({
  plugins: [
    pluginReact({
      reactRefreshOptions: {
        exclude: [/\.css\.ts$/],
      },
    }),
  ],
  tools: {
    rspack: {
      plugins: [new VanillaExtractPlugin()],
    },
  },
});

You can refer to this example: vanilla-extract.

Use StyleX#

You can use StyleX via unplugin-stylex:

import { defineConfig } from '@rsbuild/core';
import { pluginReact } from '@rsbuild/plugin-react';
import stylexPlugin from 'unplugin-stylex/rspack';

export default defineConfig({
  plugins: [pluginReact()],
  tools: {
    rspack: {
      plugins: [stylexPlugin()],
    },
  },
});

You can refer to this example: stylex.