unplugin-stylex brings StyleX transform support to multiple bundlers via unplugin.

npm i -D unplugin-stylex @stylexjs/stylex

or

yarn add -D unplugin-stylex @stylexjs/stylex

or

pnpm add -D unplugin-stylex @stylexjs/stylex

• Node.js: ^20.19.0 || >=22.12.0
• Peer dependency: @stylexjs/stylex@0.x

• Vite (unplugin-stylex/vite)
• Astro integration (unplugin-stylex/astro)
• Esbuild (unplugin-stylex/esbuild)
• Farm (unplugin-stylex/farm)
• Rspack (unplugin-stylex/rspack)
• RSBuild (through Rspack plugin in tools.rspack.plugins)
• Rolldown (unplugin-stylex/rolldown)
• Rollup (unplugin-stylex/rollup)
• Webpack (unplugin-stylex/webpack)

// vite.config.js
import { defineConfig } from 'vite'
import stylexPlugin from 'unplugin-stylex/vite'

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

// astro.config.mjs
import { defineConfig } from 'astro/config'
import stylexAstroPlugin from 'unplugin-stylex/astro'

export default defineConfig({
  integrations: [
    stylexAstroPlugin(),
  ],
})

// esbuild.config.js
import { build } from 'esbuild'
import stylexPlugin from 'unplugin-stylex/esbuild'

build({
  entryPoints: ['src/index.tsx'],
  bundle: true,
  outfile: 'dist/out.js',
  plugins: [stylexPlugin()],
})

// farm.config.js
import { defineConfig } from '@farmfe/core'
import stylexPlugin from 'unplugin-stylex/farm'

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

// rspack.config.js
import stylexPlugin from 'unplugin-stylex/rspack'

export default {
  plugins: [stylexPlugin()],
}

// rsbuild.config.ts
import { defineConfig } from '@rsbuild/core'
import stylexPlugin from 'unplugin-stylex/rspack'

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

// rolldown.config.mjs
import { defineConfig } from 'rolldown'
import stylexPlugin from 'unplugin-stylex/rolldown'

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

// rollup.config.js
import stylexPlugin from 'unplugin-stylex/rollup'

export default {
  plugins: [stylexPlugin()],
}

// webpack.config.js
const stylexPlugin = require('unplugin-stylex/webpack').default

module.exports = {
  plugins: [stylexPlugin()],
}

type UnpluginStylexOptions = {
  validExts?: RegExp | string[]
  dev?: boolean
  stylex?: {
    filename?: string
    aliases?: Record<string, string | string[]>
    stylexImports?: string[]
    classNamePrefix?: string
    unstable_moduleResolution?: {
      type: 'commonJS' | 'haste'
      rootDir: string
    }
    babelConfig?: {
      plugins: unknown[]
      presets: unknown[]
      babelrc: boolean
    }
    useCSSLayers?: boolean
    genConditionalClasses?: boolean
    treeshakeCompensation?: boolean
    runtimeInjection?: boolean
  }
}

• validExts: /\.[mc]?[jt]sx?$|\.svelte$|\.vue$/
• dev: inferred from environment (NODE_ENV / BABEL_ENV) unless explicitly set
• stylex.filename: 'stylex.css'
• stylex.stylexImports: ['@stylexjs/stylex']
• stylex.runtimeInjection: follows dev by default
• stylex.aliases: auto-reads from project config (TS paths + bundler aliases when available)
• stylex.useCSSLayers: false
• stylex.unstable_moduleResolution: { type: 'commonJS', rootDir: process.cwd() }
• stylex.babelConfig: { babelrc: false, plugins: [], presets: [] }

• The plugin only transforms modules containing at least one stylexImports source.
• Output CSS is emitted as an asset file (stylex.css by default).
• Vite and Astro integrations also handle dev server CSS serving and HTML injection.
• Astro integration defaults validExts to include .astro and .stylex.
• For Farm projects, treeshakeCompensation: true is usually needed (see example config).

• See runnable examples in examples

• @stylexjs/rollup-plugin
• vite-plugin-stylex