unplugin/docs/guide/index.md

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Getting Started

Overview

Unplugin is a library that offers a unified plugin system for various build tools. It extends the excellent Rollup plugin API to serve as the standard plugin interface, and provides a compatibility layer based on the build tools employed.

Unplugin currently supports:

• Vite
• Rollup
• webpack
• esbuild
• Rspack
• Rolldown
• Farm
• Bun

Trying It Online

You can try Unplugin in your browser directly.

Creating an Unplugin package

Templates

• unplugin/unplugin-starter
• sxzz/unplugin-starter

Check repositories above for more details.

Plugin Installation

Pre-requisites

• Node.js 18.12.0 or later.
• webpack 5 or later, if you are using webpack.

Install package

::: code-group

npm install unplugin-starter --save-dev

yarn add unplugin-starter -D

pnpm add unplugin-starter -D

bun add unplugin-starter -D

:::

Bundler & Framework Integration

::: code-group

// vite.config.ts
import Starter from 'unplugin-starter/vite'

export default defineConfig({
  plugins: [
    Starter({
      /* options */
    }),
  ],
})

// rollup.config.js
import Starter from 'unplugin-starter/rollup'

export default {
  plugins: [
    Starter({
      /* options */
    }),
  ],
}

// rolldown.config.js
import Starter from 'unplugin-starter/rolldown'

export default {
  plugins: [
    Starter({
      /* options */
    }),
  ],
}

// webpack.config.js
module.exports = {
  /* ... */
  plugins: [
    require('unplugin-starter/webpack')({
      /* options */
    }),
  ],
}

// rspack.config.js
module.exports = {
  /* ... */
  plugins: [
    require('unplugin-starter/rspack')({
      /* options */
    }),
  ],
}

// esbuild.config.js
import { build } from 'esbuild'
import Starter from 'unplugin-starter/esbuild'

build({
  plugins: [Starter()],
})

// farm.config.ts
import Starter from 'unplugin-starter/farm'

export default defineConfig({
  plugins: [
    Starter({
      /* options */
    }),
  ],
})

// bun.config.ts
import Starter from 'unplugin-starter/bun'

await Bun.build({
  entrypoints: ['./src/index.ts'],
  outdir: './dist',
  plugins: [
    Starter({
      /* options */
    }),
  ],
})

// vue.config.js
module.exports = {
  configureWebpack: {
    plugins: [
      require('unplugin-starter/webpack')({
        /* options */
      }),
    ],
  },
}

// nuxt.config.ts
export default defineNuxtConfig({
  modules: [
    [
      'unplugin-starter/nuxt',
      {
        /* options */
      },
    ],
  ],
})

// astro.config.mjs
import { defineConfig } from 'astro/config'
import Starter from 'unplugin-turbo-console/astro'

// https://astro.build/config
export default defineConfig({
  integrations: [Starter()],
})

Supported Hooks

Hook	Rollup	Vite	webpack	esbuild	Rspack	Farm	Rolldown	Bun
enforce	❌ 1	✅	✅	❌ 1	✅	✅	✅	❌
buildStart	✅	✅	✅	✅	✅	✅	✅	✅
resolveId	✅	✅	✅	✅	✅ 5	✅	✅	✅
loadInclude2	✅	✅	✅	✅	✅	✅	✅	✅
load	✅	✅	✅	✅ 3	✅	✅	✅	✅
transformInclude2	✅	✅	✅	✅	✅	✅	✅	✅
transform	✅	✅	✅	✅ 3	✅	✅	✅	✅
watchChange	✅	✅	✅	❌	✅	✅	✅	❌
buildEnd	✅	✅	✅	✅	✅	✅	✅	❌ 6
writeBundle4	✅	✅	✅	✅	✅	✅	✅	❌ 6

::: details Notice

1. Rollup and esbuild do not support using enforce to control the order of plugins. Users need to maintain the order manually.
2. Webpack's id filter is outside of loader logic; an additional hook is needed for better performance on Webpack and Rolldown. However, it is now deprecated. Please use transform/load/resolveId.filter instead. In Rollup, this hook has been polyfilled to match the behaviors. See the following usage examples for reference.
3. Although esbuild can handle both JavaScript and CSS and many other file formats, you can only return JavaScript in load and transform results.
4. Currently, writeBundle is only serves as a hook for the timing. It doesn't pass any arguments.
5. Rspack supports resolveId with a minimum required version of v1.0.0-alpha.1.
6. Bun's plugin API doesn't have an onEnd hook yet, so buildEnd and writeBundle are not supported.

:::

Usage

import type { UnpluginFactory } from 'unplugin'
import { createUnplugin } from 'unplugin'

export interface Options {
  // define your plugin options here
}

export const unpluginFactory: UnpluginFactory<Options | undefined> = options => ({
  name: 'unplugin-starter',
  transform: {
    // an additional hook is needed for better perf on webpack and rolldown
    filter: {
      id: /main\.ts$/
    },
    handler(code) {
      return code.replace(/<template>/, '<template><div>Injected</div>')
    },
  },
  // more hooks coming
})

export const unplugin = /* #__PURE__ */ createUnplugin(unpluginFactory)

export default unplugin

export const vitePlugin = unplugin.vite
export const rollupPlugin = unplugin.rollup
export const rolldownPlugin = unplugin.rolldown
export const webpackPlugin = unplugin.webpack
export const rspackPlugin = unplugin.rspack
export const esbuildPlugin = unplugin.esbuild
export const farmPlugin = unplugin.farm
export const bunPlugin = unplugin.bun

Filters

To optimize performance in native bundlers, leverage the filter option in resolveId, transform, and load hooks to exclude files that don’t require processing.

import { createUnplugin } from 'unplugin'

type FilterPattern = string | RegExp | Array<string | RegExp>

const plugin = createUnplugin(() => ({
  name: 'unplugin-starter',
  transform: {
    filter: {
      id: {
        include: [/\.js$/, '**/*.ts'],
        exclude: /node_modules/,
      },
      code: {
        include: 'foo',
        exclude: 'bar',
      },
    },
    handler(code) {
      // ...
    },
  }
}))

More details can be found in the Rolldown's documentation.

Supported Context

Context	Rollup	Vite	webpack	esbuild	Rspack	Farm	Rolldown	Bun
this.parse	✅	✅	✅	✅	✅	✅	✅	✅
this.addWatchFile	✅	✅	✅	❌	✅	✅	✅	✅
this.emitFile1	✅	✅	✅	✅	✅	✅	✅	✅
this.getWatchFiles	✅	✅	✅	❌	✅	✅	✅	✅
this.warn	✅	✅	✅	✅	✅	✅	✅	✅
this.error	✅	✅	✅	✅	✅	✅	✅	✅

::: info Notice

1. Currently, this.emitFile only supports the EmittedAsset variant. :::

Nested Plugins

Unplugin supports constructing multiple nested plugins to behave like a single one.

Bundler Supported

Rollup	Vite	webpack	Rspack	esbuild	Farm	Rolldown	Bun
✅ >=3.11	✅	✅	✅	✅	✅	✅	✅

::: details Notice

1. Rollup supports nested plugins since v3.1.0. Plugin author should ask users to have a Rollup version of >=3.1.0 when using nested plugins. For single plugin format, Unplugin works for any version of Rollup. :::

Usage

import type { UnpluginFactory } from 'unplugin'
import { createUnplugin } from 'unplugin'

export interface Options {
  // define your plugin options here
}

export const unpluginFactory: UnpluginFactory<Options | undefined> = options => [
  {
    name: 'plugin-a',
    transform(code) {
      return code.replace(/<template>/, '<template><div>Injected</div>')
    },
  },
  {
    name: 'plugin-b',
    resolveId(id) {
      return id
    },
  },
]

export const unplugin = /* #__PURE__ */ createUnplugin(unpluginFactory)

export default unplugin

Bundler-Specific Logic

While Unplugin provides compatible layers for some hooks, the functionality of it is limited to the common subset of the build's plugins capability. For more advanced bundler-specific usages, Unplugin provides an escape hatch for that.

Hooks

import type { UnpluginFactory } from 'unplugin'
import { createUnplugin } from 'unplugin'

export interface Options {
  // define your plugin options here
}

export const unpluginFactory: UnpluginFactory<Options | undefined> = (
  options,
  meta,
) => {
  console.log(meta.framework) // vite rollup webpack esbuild rspack...
  return {
    name: 'unplugin-starter',
    transform: {
      // an additional hook is needed for better perf on webpack and rolldown
      filter: {
        id: /main\.ts$/
      },
      handler(code) {
        return code.replace(/<template>/, '<template><div>Injected</div>')
      },
    },
    vite: {
      // Vite plugin
      configureServer(server) {
        // configure Vite server
      },
    },
    rollup: {
      // Rollup plugin
    },
    rolldown: {
      // Rolldown plugin
    },
    webpack(compiler) {
      // Configure webpack compiler
    },
    rspack(compiler) {
      // Configure Rspack compiler
    },
    esbuild: {
      // Change the filter of onResolve and onLoad
      // onResolveFilter?: RegExp,
      // onLoadFilter?: RegExp,
      // Tell esbuild how to interpret the contents. By default Unplugin tries to guess the loader
      // from file extension (eg: .js -> "js", .jsx -> 'jsx')
      // loader?: (Loader | (code: string, id: string) => Loader)
      // Or you can completely replace the setup logic
      // setup?: EsbuildPlugin.setup,
    },
    farm: {
      // Farm plugin
    },
    bun: {
      // Bun plugin
    },
  }
}

export const unplugin = /* #__PURE__ */ createUnplugin(unpluginFactory)

export default unplugin

Plugins

The package exports a set of functions in place of createUnplugin that allow for the creation of plugins for specific bundlers. Each of the function takes the same generic factory argument as createUnplugin.

import {
  createBunPlugin,
  createEsbuildPlugin,
  createFarmPlugin,
  createRolldownPlugin,
  createRollupPlugin,
  createRspackPlugin,
  createVitePlugin,
  createWebpackPlugin,
} from 'unplugin'

const vitePlugin = createVitePlugin(/* factory */)
const rollupPlugin = createRollupPlugin(/* factory */)
const rolldownPlugin = createRolldownPlugin(/* factory */)
const esbuildPlugin = createEsbuildPlugin(/* factory */)
const webpackPlugin = createWebpackPlugin(/* factory */)
const rspackPlugin = createRspackPlugin(/* factory */)
const farmPlugin = createFarmPlugin(/* factory */)
const bunPlugin = createBunPlugin(/* factory */)