README

vite-plugin-externals

use to external resources, like webpack externals, but only use in browser now.

Can be used in production mode without other rollup configuration.

but it will not take effect by default in commonjs, such as ssr.

Usage

npm i vite-plugin-externals -D

Add it to vite.config.js

// vite.config.js
import { viteExternalsPlugin } from 'vite-plugin-externals'

export default {
  plugins: [
    viteExternalsPlugin({
      vue: 'Vue',
      react: 'React',
      'react-dom': 'ReactDOM',
      // value support chain, tranform to window['React']['lazy']
      lazy: ['React', 'lazy']
    }),
  ]
}

Warning: If you loaded production libray in vite dev mode , may make HMR fail.

Eg.

<!-- may make HMR fail -->
<script src="./vue.global.prod.js"></script>

<!-- good -->
<script src="./vue.global.js"></script>

How to work

transform source code of js file.

// configuration
viteExternalsPlugin({
  vue: 'Vue',
}),
// source code
import Vue from 'vue'
// transformed
const Vue = window['Vue']

// source code
import { reactive, ref as r } from 'vue'
// transformed
const reactive = window['Vue'].reactive
const r = window['Vue'].ref

// source code
import * as vue from 'vue'
// transformed
const vue = window['Vue']

// source code
export { useState as _useState } from 'react'
// transformed
export const _useState = window['React'].useState

Warning: please use the plugin after converting to JS code, because the plugin only transform JS code. Eg.

import vue from '@vitejs/plugin-vue'

export default {
  plugins: [
    vue(), // @vitejs/plugin-vue will transofrm SFC to JS code

    // It should be under @vitejs/plugin-vue
    viteExternalsPlugin({
      vue: 'Vue',
    }),
  ]
}

Configuration

filter

The files in node_modules are filtered by default, and only transform js/ts/vue/jsx/tsx file.

You can specify the filter function. Return true will be transform to external.

viteExternalsPlugin({
  vue: 'Vue',
}, {
  filter(code, id, ssr) {
    // your code
    return false
  }
}),

useWindow

set false, the window prefix will not be added.

Warning: If your module name has special characters, such as /, set useWindow option false, will throw error.

viteExternalsPlugin({
  vue: 'Vue',
}, { useWindow: false }),

// source code
import Vue from 'vue'
// transformed, no `const Vue = window['Vue']`
const Vue = Vue

sourceMapOptions

The configuration item of the code sourcemap after code conversion. The library is magic-string.

Usage no npm install needed!