The Vue project is optimized from 2.5M to 200kb

This article comes from the public number: Front-end development community, author: gun brother

A vue cli3.0 project was recently optimized, from package volume 2.5M to 272k with a speed increase of 2/3 Here's how to optimize:

A new vue.config.js needs to be created (this file name is fixed) in the same level of directory as package.json

BundleAnalyzer

Role: To display packaged graphical information, will open an html page to help themselves analyze which files are too large, can be optimized by needles, before online 注释掉

Install webpack-bundle-analyzer

  npm install webpack-bundle-analyzer --save-dev

at vue.config.js: Inside:

// 引入
const BundleAnalyzerPlugin = require("webpack-bundle-analyzer").BundleAnalyzerPlugin;


// 展示图形化信息
chainWebpack: config => {
  config
      .plugin('webpack-bundle-analyzer')
      .use(BundleAnalyzerPlugin)
}

Pull out css supports on-demand loading

Install mini-css-extract-plugin plug-in

 npm install mini-css-extract-plugin -D

Inside vue.config.js

chainWebpack: config => {
  let miniCssExtractPlugin = new MiniCssExtractPlugin({
    filename: 'assets/[name].[hash:8].css',
    chunkFilename: 'assets/[name].[hash:8].css'
  })
  config.plugin('extract-css').use(miniCssExtractPlugin)
}

Pictures load on demand

Install image-webpack-loader

 npm install image-webpack-loader -D

Inside vue.config.js

config.module.rule('images')
    .test(/\.(png|jpe?g|gif|webp)(\?.*)?$/)
    .use('image-webpack-loader')
    .loader('image-webpack-loader')
    .options({
      bypassOnDebug: true
    })
    .end()

Picture compression can be done in batches at: https://tinypng.com/

gzip compression code

Install compression-webpack-plugin plug-in

 npm install compression-webpack-plugin -D

Inside vue.config.js

const CompressionWebpackPlugin = require('compression-webpack-plugin');


// 开启gzip压缩
  config.plugins.push(
    new CompressionWebpackPlugin(
      {
        filename: info => {
          return `${info.path}.gz${info.query}`
        },
        algorithm: 'gzip',
        threshold: 10240, // 只有大小大于该值的资源会被处理 10240
        test: new RegExp('\\.(' + ['js'].join('|') + ')$'
        ),
        minRatio: 0.8, // 只有压缩率小于这个值的资源才会被处理
        deleteOriginalAssets: false // 删除原文件
      }
    )
  )

The common code is drawn away

Inside vue.config.js

// 开启gzip压缩


configureWebpack: config => {
  config.plugins.push(
    new CompressionWebpackPlugin(
      {
        filename: info => {
          return `${info.path}.gz${info.query}`
        },
        algorithm: 'gzip',
        threshold: 10240, // 只有大小大于该值的资源会被处理 10240
        test: new RegExp('\\.(' + ['js'].join('|') + ')$'
        ),
        minRatio: 0.8, // 只有压缩率小于这个值的资源才会被处理
        deleteOriginalAssets: false // 删除原文件
      }
    )
  )
}

Element-ui loads on demand

Install the babel-plugin-component plug-in

 npm install babel-plugin-component --save-dev

Inside babel.config.js

module.exports = {
  presets: [
    '@vue/app'
  ],
  plugins: [
    [
      "component",
      {
        libraryName: "element-ui",
        styleLibraryName: "theme-chalk"
      }
    ]
  ]
}

echarts load on demand:

Install babel-plugin-equire

npm install babel-plugin-equire -D

Create echarts.js in your project :

// eslint-disable-next-line
  const echarts = equire([
    // 写上你需要的 echarts api
    "tooltip",
    "line"
  ]);


  export default echarts;

Inside babel.config.js

module.exports = {
  presets: [
    '@vue/app'
  ],
  plugins: [
    [
      "component",
      {
        libraryName: "element-ui",
        styleLibraryName: "theme-chalk"
      }
    ],
    "equire"
  ]
}

Specific page applications:

 // 直接引用
 import echarts from '@/lib/util/echarts.js' 

 
 this.myChart = echarts.init(this.$refs.chart) 

Lodash loads on demand:

Install lodash-webpack-plugin plug-in

 npm install lodash-webpack-plugin --save-dev

Inside babel.config.js

module.exports = {
  presets: [
    '@vue/app'
  ],
  plugins: [
    [
      "component",
      {
        libraryName: "element-ui",
        styleLibraryName: "theme-chalk"
      }
    ],
    "lodash",
    "equire"
  ]
}

Inside vue.config.js

const LodashModuleReplacementPlugin = require("lodash-webpack-plugin");


chainWebpack: config => {
    config
    .plugin("loadshReplace")
    .use(new LodashModuleReplacementPlugin());
}

prefetch and preload

Remove useless plug-ins and avoid loading extra resources (if not, useless js files are loaded in index .html)

chainWebpack: config => {
    // 移除prefetch插件，避免加载多余的资源
    config.plugins.delete('prefetch')
    / 移除 preload 插件，避免加载多余的资源
    config.plugins.delete('preload');
}

Full code:

const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CompressionWebpackPlugin = require('compression-webpack-plugin');
const LodashModuleReplacementPlugin = require("lodash-webpack-plugin");


module.exports = {
  productionSourceMap: false, // 关闭生产环境的 source map
  lintOnSave: false,
  publicPath: process.env.VUE_APP_PUBLIC_PATH,
  devServer: {
    host: "localhost",
    port: 3002,
    proxy: {
      '/api': {
        target: "https://tapi.quanziapp.com/api/",
        ws: true,
        changeOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      },
    }
  },


  chainWebpack: config => {


    // 移除 prefetch 插件
    config.plugins.delete('prefetch');
    // 移除 preload 插件，避免加载多余的资源
    config.plugins.delete('preload');

 
    config.optimization.minimize(true);


    config.optimization.splitChunks({
      chunks: 'all'
    })


    config
      .plugin('webpack-bundle-analyzer')
      .use(require('webpack-bundle-analyzer').BundleAnalyzerPlugin)


    if (process.env.NODE_ENV !== 'development') {


      let miniCssExtractPlugin = new MiniCssExtractPlugin({
        filename: 'assets/[name].[hash:8].css',
        chunkFilename: 'assets/[name].[hash:8].css'
      })
      config.plugin('extract-css').use(miniCssExtractPlugin)
      config.plugin("loadshReplace").use(new LodashModuleReplacementPlugin());


      config.module.rule('images')
        .test(/\.(png|jpe?g|gif|webp)(\?.*)?$/)
        .use('image-webpack-loader')
        .loader('image-webpack-loader')
        .options({
          bypassOnDebug: true
        })
        .end()
        .use('url-loader')
        .loader('file-loader')
        .options({
          name: 'assets/[name].[hash:8].[ext]'
        }).end()
      config.module.rule('svg')
        .test(/\.(svg)(\?.*)?$/)
        .use('file-loader')
        .loader('file-loader')
        .options({
          name: 'assets/[name].[hash:8].[ext]'
        })
    }
  },
  configureWebpack: config => {
    // config.plugins.push(["equire"]);


    if (process.env.NODE_ENV !== 'development') {
      config.output.filename = 'assets/[name].[hash:8].js'
      config.output.chunkFilename = 'assets/[name].[hash:8].js'
    }
    // 公共代码抽离
    config.optimization = {
      // 分割代码块
      splitChunks: {
        cacheGroups: {
          //公用模块抽离
          common: {
            chunks: 'initial',
            minSize: 0, //大于0个字节
            minChunks: 2, //抽离公共代码时，这个代码块最小被引用的次数
          },
          //第三方库抽离
          vendor: {
            priority: 1, //权重
            test: /node_modules/,
            chunks: 'initial',
            minSize: 0, //大于0个字节
            minChunks: 2, //在分割之前，这个代码块最小应该被引用的次数
          },
        },
      }
    }
    // 开启gzip压缩
    config.plugins.push(
      new CompressionWebpackPlugin(
        {
          filename: info => {
            return `${info.path}.gz${info.query}`
          },
          algorithm: 'gzip',
          threshold: 10240, // 只有大小大于该值的资源会被处理 10240
          test: new RegExp('\\.(' + ['js'].join('|') + ')$'
          ),
          minRatio: 0.8, // 只有压缩率小于这个值的资源才会被处理
          deleteOriginalAssets: false // 删除原文件
        }
      )
    )
  },
  css: {
    extract: true,
    sourceMap: false,
    loaderOptions: {
      sass: {
      },
    },
  },
}

The above is W3Cschool编程狮 about the Vue project from 2.5M optimization to 200kb of the whole process of the introduction, I hope to help you.