如何在 webpack 中使用 Terser

Posted 2023-02-22

【中文标题】如何在 webpack 中使用 Terser

【英文标题】：How to use Terser with webpack

【发布时间】：2019-12-13 02:16:47

【问题描述】：

我正在使用 Webpack 6.10.2 和 Vue 3.9.3。 此安装使用 Uglify.js，当我运行 npm run build 时会引发错误，因为它无法与 ES6 一起使用。

为了解决这个问题，我已按照建议删除了 Uglify 表单 webpack.config.js，并尝试使用 Terser 来缩小生产中的 JS。我所做的每一次尝试都会导致错误，因为我没有正确添加语法。当我删除 Terser 时，应用程序会编译，但显然没有 JS 缩小，所以我在 webpack.config.js 中的语法有问题。

谁能告诉我哪里出错了。

谢谢

webpack.config.js：

var path = require('path')
var webpack = require('webpack')
const TerserPlugin = require('terser-webpack-plugin')

module.exports = 
  entry: './src/main.js',
  output: 
    path: path.resolve(__dirname, './dist'),
    publicPath: '/dist/',
    filename: 'build.js'
  ,
  module: 
    rules: [
      
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader'
        ],
      ,
      
        test: /\.scss$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'sass-loader'
        ],
      ,
      
        test: /\.sass$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'sass-loader?indentedSyntax'
        ],
      ,
      
        test: /\.vue$/,
        loader: 'vue-loader',
        options: 
          loaders: 
            // Since sass-loader (weirdly) has SCSS as its default parse mode, we map
            // the "scss" and "sass" values for the lang attribute to the right configs here.
            // other preprocessors should work out of the box, no loader config like this necessary.
            'scss': [
              'vue-style-loader',
              'css-loader',
              'sass-loader'
            ],
            'sass': [
              'vue-style-loader',
              'css-loader',
              'sass-loader?indentedSyntax'
            ]
          
          // other vue-loader options go here
        
      ,
      
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      ,
      
        test: /\.(png|jpg|gif|svg)$/,
        loader: 'file-loader',
        options: 
          name: '[name].[ext]?[hash]'
        
      
    ]
  ,
  resolve: 
    alias: 
      'vue$': 'vue/dist/vue.esm.js'
    ,
    extensions: ['*', '.js', '.vue', '.json']
  ,
  devServer: 
    historyApiFallback: true,
    noInfo: true,
    overlay: true
  ,
  performance: 
    hints: false
  ,
  devtool: '#eval-source-map'


if (process.env.NODE_ENV === 'production') 
  module.exports = 
    optimization: )
    minimizer: [new TerserPlugin()],
  ,
  module.exports.devtool = '#source-map'
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin(
      'process.env': 
        NODE_ENV: '"production"'
      
    ),
    new webpack.LoaderOptionsPlugin(
      minimize: true
    )
  ])

package.json：

  "name": "vue_frontend",
  "description": "A Vue.js project",
  "version": "1.0.0",
  "author": "Thomas Bishop <[e-mail]>",
  "license": "MIT",
  "private": true,
  "scripts": 
    "dev": "cross-env NODE_ENV=development webpack-dev-server --open --hot",
    "build": "cross-env NODE_ENV=production webpack --progress --hide-modules"
  ,
  "dependencies": 
    "buefy": "^0.7.10",
    "vue": "^2.5.11",
    "vue-router": "^3.0.7"
  ,
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ],
  "devDependencies": 
    "babel-core": "^6.26.0",
    "babel-loader": "^7.1.2",
    "babel-preset-env": "^1.6.0",
    "babel-preset-stage-3": "^6.24.1",
    "cross-env": "^5.0.5",
    "css-loader": "^0.28.7",
    "file-loader": "^1.1.4",
    "node-sass": "^4.5.3",
    "sass-loader": "^6.0.6",
    "terser-webpack-plugin": "^1.4.1",
    "vue-loader": "^13.0.5",
    "vue-template-compiler": "^2.4.4",
    "webpack": "^3.6.0",
    "webpack-dev-server": "^2.9.1"
  

【问题讨论】：

很抱歉，您在未来如何使用“Webpack 6.10.2 with Vue 3.9.3”？

大声笑，也默认集成了实际版本的terser

【参考方案1】：

 optimization: 
  removeAvailableModules: false,
   minimizer: [
    new TerserJSPlugin(
      terserOptions: 
        parse: 
          // we want terser to parse ecma 8 code. However, we don't want it
          // to apply any minfication steps that turns valid ecma 5 code
          // into invalid ecma 5 code. This is why the 'compress' and 'output'
          // sections only apply transformations that are ecma 5 safe
          // https://github.com/facebook/create-react-app/pull/4234
          ecma: 8
        ,
        compress: 
          ecma       : 5,
          warnings   : false,
          // Disabled because of an issue with Uglify breaking seemingly valid code:
          // https://github.com/facebook/create-react-app/issues/2376
          // Pending further investigation:
          // https://github.com/mishoo/UglifyJS2/issues/2011
          comparisons: false,
          // Disabled because of an issue with Terser breaking valid code:
          // https://github.com/facebook/create-react-app/issues/5250
          // Pending futher investigation:
          // https://github.com/terser-js/terser/issues/120
          inline     : 2
        ,
        mangle: 
          safari10: true
        ,
        output: 
          ecma      : 5,
          comments  : false,
          // Turned on because emoji and regex is not minified properly using default
          // https://github.com/facebook/create-react-app/issues/2488
          ascii_only: true
        
      ,
      cache: true,
      parallel: true,
      sourceMap: true, // Must be set to true if using source-maps in production
    ),
    new OptimizeCSSAssetsPlugin()
],
runtimeChunk: true
,

【参考方案2】：

从 webpack 5 开始，你只需要添加这个语法来扩展现有的最小化器，terser 就是其中之一。 https://webpack.js.org/plugins/css-minimizer-webpack-plugin/

minimizer: [
  // this `...` do that for you
  `...`,
 // your other minimizers goes here
  new CssMinimizerPlugin(
    exclude: /(node_modules)/,
  ),
],