前言

让项目体积更小点

压缩打包的文件

包安装

npm i compression-webpack-plugin@5.0.0 -D / cnpm i compression-webpack-plugin@5.0.0 -D /yarn add compression-webpack-plugin@5.0.0

webapack配置

module.exports = {
  ...
  chainWebpack:config => {
    config.plugin('compression')
      .use(
      new CompressionWebpackPlugin(
        {
          filename: info => {
            return `${info.path}.gz${info.query}`
          },
          algorithm: 'gzip',
          threshold: 10240, 
          test: /\.(js|css|json|txt|html|ico|svg)(\?.*)?$/i,
          minRatio: 0.8, 
          deleteOriginalAssets: true 
        }
      )
    )
  }
}

推荐在生产环境使用

删除多余的文件

包安装

npm i useless-files-webpack-plugin -D / cnpm i useless-files-webpack-plugin -D /yarn add useless-files-webpack-plugin

webapack配置

module.exports = {
  ...
  chainWebpack = config => {
    config.plugin('uselessFile')
      .use(
        new UselessFile({
          root: path.resolve(__dirname,'./src/assets/images'), 
          clean:true,
          exclude: /node_modules/
      })
    )
  }
}

推荐生产环境使用

删除 prefetch、preload

webapack配置

module.exports = {
  ...
  chainWebpack: config =>{
    config.plugins.delete('prefetch')
    config.plugins.delete('preload')
  }
}

忽略 moment 本地化

webpack配置

module.exports = {
  ...
  chainWebpack : config=>{
    config.plugin('IgnorePlugin')
      .use(new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/))
  }
}

按需加载Element

Babel.config.js

module.exports = {
  ...
  plugins:[
    [
      "component",
      {
        libraryName: "element-ui",
        styleLibraryName: "theme-chalk"
      }
    ]
  ]
}

按需导入组件

import Vue from 'vue'
import { Dialog } from 'element-ui'
Vue.use(Dialog)

按需加载Echart

Babel.config.js

module.exports = {
  ...
  plugins:[
   ...
   'equire'
  ]
}

按需使用echart

// eslint-disable-next-line
const echarts = equire([
  "line",
  "bar"
])
export default echarts

按需加载loadsh

Babel.config.js

module.exports = {
  ...
  plugins:[
   ...
   'lodash'
  ]
}

webpack配置

module.exports = {
  ...
  chainWebpack: config =>{
    ...
    config.plugin('loadshReplace')
      .use(new LodashModuleReplacementPlugin())
  }
}

让项目打包更快

开启多线程打包（HappyPack）

包安装

npm i happypack -D / cnpm i happypack -D /yarn add happypack

webpack配置

const HappyPack = require('happypack')
const os = require('os')
const happyThreadPool = HappyPack.ThreadPool({ size: os.cpus().length })
module.exports = {
  ...
  chainWebpack: config =>{
    ...
    const jsRule = config.module.rule('js')
      jsRule.uses.clear()
      jsRule.use('happypack/loader?id=babel')
          .loader('happypack/loader?id=babel')
          .end()
    config.plugins.push(
      new HappyPack({
        id:'babel',
        loaders:['babel-loader?cacheDirectory=true'],
        threadPool:happyThreadPool
      })
    )
  }
}

动态链打包

webpack.dll.config

const webpack = require('webpack')
const path = require('path')

module.exports = {
  entry: {
    vendor: ['vue', 'vue-router', 'axios', 'echarts','element-ui','moment','sortablejs'] // 第三方包
  },

  output: {
    filename: '[name].dll.js',
    path: path.resolve(__dirname, 'dll'),
    library:'[name]_lib'
  },

  plugins: [
    new webpack.DllPlugin({
      path: path.resolve(__dirname, 'dll/[name]-manifest.json'),
      name: '[name]_lib'
    })
  ]
}

执行一下这个文件，拿到编译后的代码

webpack --config webpack.dll.config.js

webpack配置

module.exports = {
  ...
  configureWebpack: config => {
      config.plugins.push(
        new webpack.DllReferencePlugin({
          manifest: path.resolve(__dirname, 'dll/vendor-manifest.json')
        })
      )
      config.plugins.push(
        new AddAssetHtmlPlugin({ filepath: path.resolve(__dirname,'dll/vendor.dll.js') })
      )
  }
}

end

以上是笔者平时针对自己项目或者公司项目累积的一点vue项目打包优化知识，也许你有更好的优化点，或者更好的优化方案，欢迎提供案例，学习学习。