vue-cli3 DllPlugin 提取公用库的方法

yarn add webpack-cli@^3.2.3 add-asset-html-webpack-plugin@^3.1.3 clean-webpack-plugin@^1.0.1 --dev

const path = require('path')
const webpack = require('webpack')
const CleanWebpackPlugin = require('clean-webpack-plugin')

// dll文件存放的目录
const dllPath = 'public/vendor'

module.exports = {
 entry: {
  // 需要提取的库文件
  vendor: ['vue', 'vue-router', 'vuex', 'axios', 'element-ui']
 },
 output: {
  path: path.join(__dirname, dllPath),
  filename: '[name].dll.js',
  // vendor.dll.js中暴露出的全局变量名
  // 保持与 webpack.DllPlugin 中名称一致
  library: '[name]_[hash]'
 },
 plugins: [
  // 清除之前的dll文件
  new CleanWebpackPlugin(['*.*'], {
   root: path.join(__dirname, dllPath)
  }),
  // 设置环境变量
  new webpack.DefinePlugin({
   'process.env': {
    NODE_ENV: 'production'
   }
  }),
  // manifest.json 描述动态链接库包含了哪些内容
  new webpack.DllPlugin({
   path: path.join(__dirname, dllPath, '[name]-manifest.json'),
   // 保持与 output.library 中名称一致
   name: '[name]_[hash]',
   context: process.cwd()
  })
 ]
}

"scripts": {
  ...
  "dll": "webpack -p --progress --config ./webpack.dll.conf.js"
},

const webpack = require('webpack')
module.exports = {
  ...
  configureWebpack: {
    plugins: [
     new webpack.DllReferencePlugin({
      context: process.cwd(),
      manifest: require('./public/vendor/vendor-manifest.json')
     })
    ]
  }
}

...
<script src="./vendor/vendor.dll.js"></script>

const path = require('path')
const webpack = require('webpack')
const AddAssetHtmlPlugin = require('add-asset-html-webpack-plugin')

module.exports = {
  ...
  configureWebpack: {
    plugins: [
     new webpack.DllReferencePlugin({
      context: process.cwd(),
      manifest: require('./public/vendor/vendor-manifest.json')
     }),
     // 将 dll 注入到 生成的 html 模板中
     new AddAssetHtmlPlugin({
      // dll文件位置
      filepath: path.resolve(__dirname, './public/vendor/*.js'),
      // dll 引用路径
      publicPath: './vendor',
      // dll最终输出的目录
      outputPath: './vendor'
     })
    ]
  }
}