unplugin/docs/guide/index.md

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Getting Started

Overview

Unplugin is a library that offers an 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 current supports:

• Vite
• Rollup
• webpack
• esbuild
• Rspack (⚠️ experimental)
• Rolldown (⚠️ experimental)

Trying It Online

You can try Unplugin in your browser directly.

Creating an Unplugin package

npx degit unplugin/unplugin-starter unplugin-starter

Check the unplugin-starter repository for more details.

Plugin Installation

Pre-requisites

• Node.js 14.0.0 or later

::: warning We will discontinue support for Node.js v14 & v16 in the next major release. Please consider upgrading to Node.js v18 or higher. :::

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 */ }),
  ],
}

// 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()],
})

// 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 4	webpack 5	esbuild	Rspack
enforce	❌ 1	✅	✅	✅	❌ 1	✅
buildStart	✅	✅	✅	✅	✅	✅
resolveId	✅	✅	✅	✅	✅	❌
loadInclude2	✅	✅	✅	✅	✅	✅
load	✅	✅	✅	✅	✅ 3	✅
transformInclude2	✅	✅	✅	✅	✅	✅
transform	✅	✅	✅	✅	✅ 3	✅
watchChange	✅	✅	✅	✅	❌	❌
buildEnd	✅	✅	✅	✅	✅	✅
writeBundle4	✅	✅	✅	✅	✅	✅

::: 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 perf on webpack. In Rollup and Vite, this hook has been polyfilled to match the behaviors. See for the following usage examples.
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. :::

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',
  // webpack's id filter is outside of loader logic,
  // an additional hook is needed for better perf on webpack
  transformInclude(id) {
    return id.endsWith('main.ts')
  },
  // just like rollup transform
  transform(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 webpackPlugin = unplugin.webpack
export const rspackPlugin = unplugin.rspack
export const esbuildPlugin = unplugin.esbuild

Supported Context

Context	Rollup	Vite	webpack 4	webpack 5	esbuild	Rspack
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

Since v0.10.0, Unplugin supports constructing multiple nested plugins to behave like a single one.

Bundler Supported

Rollup	Vite	webpack 4	webpack 5	Rspack	esbuild
✅ >=3.11	✅	✅	✅	✅	✅ (v1.8.0+)

::: 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(code) {
      return code.replace(/<template>/, '<template><div>Injected</div>')
    },
    transformInclude(id) {
      return id.endsWith('main.ts')
    },
    vite: {
      // Vite plugin
      configureServer(server) {
        // configure Vite server
      },
    },
    rollup: {
      // Rollup plugin
    },
    webpack(complier) {
      // Configure webpack compiler
    },
    rspack(complier) {
      // Configure webpack 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,
    },
  }
}

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 {
  createEsbuildPlugin,
  createRollupPlugin,
  createRspackPlugin,
  createVitePlugin,
  createWebpackPlugin
} from 'unplugin'

const vitePlugin = createVitePlugin({ /* options */ })
const rollupPlugin = createRollupPlugin({ /* options */ })
const esbuildPlugin = createEsbuildPlugin({ /* options */ })
const webpackPlugin = createWebpackPlugin({ /* options */ })
const rspackPlugin = createRspackPlugin({ /* options */ })