Question

我尝试过像Uglifyjs，babelli（babel-minify）这样的选项。似乎没什么用.Uglify会抛出一些错误：

预期名称[au680.bundle.js：147541,22]

babelli也没有缩小代码。任何人都可以使用webpack 2，babel进行es6缩小的简单示例。可能是一个干净利落的插件。

＆＃13;

var path = require('path');
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var AppCachePlugin = require('appcache-webpack-plugin');

var appConfig= require('./config.js');
console.log("appConfig is ->>>",appConfig);
var appPort = appConfig.APP_PORT;//Port on which the application is running

process.noDeprecation = true;
var ASSET_PATH = '/'
module.exports = function(options) {
  var entry, jsLoaders, plugins, cssLoaders, devtool;
  console.log('options webconfig-->', options, 'directory name', __dirname);

  // If production is true
  if (options.prod) {
    console.log('production minification');
    // Entry
    entry = {
       veris:path.resolve(__dirname,'./VerisInstrument/js/VerisApp.js'),
       au680 : path.resolve(__dirname,'./Au680Instrument/js/au680App.js'),
	   commondashboard:path.resolve(__dirname,'./CommonDashboard/js/CommonDashboardApp.js'),
       groups:path.resolve(__dirname,'./Groups/js/GroupsApp.js'),
       homepage : path.resolve(__dirname,'./HomePage/js/HomePageApp.js'),
       infohealthcheck : path.resolve(__dirname,'./Common/js/infohealthcheckapp.js')
      
    };

   
    // Plugins
    plugins = [// Plugins for Webpack
    new webpack.DefinePlugin({
    'process.env': {
      'NODE_ENV': JSON.stringify('production')
    }
   }),
  //   new webpack.optimize.UglifyJsPlugin({minimize: true,comments : false,compress: {
  //   // remove warnings
  //   warnings: false,

  //   // Drop console statements
  //   drop_console: true
  // }})

    
      // new es3MemberExpressionLiterals(),
      //
      
    ];

  // If app is in development
  } else {
    devtool = 'source-map';
    // Entry
    // entry = [
    //   "webpack-dev-server/client?http://0.0.0.0:" + appPort, // Needed for hot reloading
    //   "webpack/hot/only-dev-server", // See above
    //   //path.resolve(__dirname,'./app') // Start with js/app.js...
    //   path.resolve(__dirname,'./VerisInstrument/js/VerisApp')
    // ];
  //   require("babel-core").transform("code", {
  //   plugins: ["transform-object-rest-spread"]
  // });
    entry = {
      main: [
        "webpack-dev-server/client?http://0.0.0.0:" + appPort, // Needed for hot reloading
        "webpack/hot/only-dev-server" // See above
      ],
      //path.resolve(__dirname,'./js/app') // Start with js/app.js...
     veris : path.resolve(__dirname,'./VerisInstrument/js/VerisApp'),
      au680 : path.resolve(__dirname,'./Au680Instrument/js/au680App.js'),
	  commondashboard:path.resolve(__dirname,'./CommonDashboard/js/CommonDashboardApp.js'),
      groups:path.resolve(__dirname,'./Groups/js/GroupsApp.js'),
      homepage : path.resolve(__dirname,'./HomePage/js/HomePageApp.js'),
      infohealthcheck : path.resolve(__dirname,'./Common/js/infohealthcheckapp.js')
      
    };
    
    // Only plugin is the hot module replacement plugin
    plugins = [
     new webpack.DefinePlugin({
    'process.env': {
      'NODE_ENV': JSON.stringify('development'),
      }
     }),
     new webpack.HotModuleReplacementPlugin()// Make hot loading work,
    ]
  }

  return {
    devtool: devtool,
    entry: entry,
    // output: { // Compile into js/build.js
    //   path: path.resolve(__dirname, 'build'),
    //   filename: "js/bundle.js",
    //   publicPath : '/'
    // },
    output: { // Compile into js/build.js
      path: path.resolve(__dirname, 'build'),
      filename: '[name].bundle.js',
      publicPath : ASSET_PATH
    },
    module: {
      rules: [
      {
          test: /\.js$/, // Transform all .js files required somewhere within an entry point...
          loader: 'babel-loader', // ...with the specified loaders...
          exclude: /node_modules/,
          options: {
          presets: ['es2015','react','stage-2','env'],
          plugins: [require('babel-plugin-transform-object-rest-spread'),require('babel-plugin-transform-es2015-destructuring'),require('babel-plugin-transform-es2015-parameters')]
        }
          // query : {
          //   presets : ['es2015','react','stage-2','env']
          // }

        }
        , {
          test:   /\.css$/, // Transform all .css files required somewhere within an entry point...
          use : [
            {
              loader : 'style-loader'
            },
            {
              loader : 'css-loader'
            },
            {
              loader : 'postcss-loader'
            },
            {
              loader: 'sass-loader'
            }
          ] // ...with PostCSS
        }, {
          test: /\.jpe?g$|\.gif$|\.png$/i,
          loader: "url-loader?limit=100000"
        },
        { test: /\.(woff|woff2|eot|ttf|svg)$/,
         loader: 'url-loader?limit=100000' }
      ]
    },
    plugins: plugins,
    target: "web", // Make web variables accessible to webpack, e.g. window
    stats: false, // Don't show stats in the console
    node: {
      fs: "empty"
    }
  }
}

＆＃13;

Answer 1

来自https://github.com/webpack/webpack/issues/2545：

问题是UglifyJS还不支持ES6，所以它还不可能避免这种转变。您可以在mishoo/UglifyJS2#448处按照进度进行操作。

有很多解决方案;这是一对夫妇：

首先透明ES6代码，然后缩小
为了获得最大的兼容性，使用Babel进行转换，然后使用Babel Minify（以前称为Babili）进行缩小：

安装babel-loader和babel-minify-webpack-plugin

npm install babel-loader babel-minify-webpack-plugin --save-dev

或者：

yarn add babel-loader babel-minify-webpack-plugin --dev

将此添加到webpack.config.js：

const MinifyPlugin = require('babel-minify-webpack-plugin');

module.exports = {
  // ...
  module: {
    rules: [
      {
        test: /\.js$/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['env']
          }
        }
      }
    ]
  },
  plugins: [
    new MinifyPlugin()
  ]
};

或者如果您愿意，可以使用UglifyJS代替Babel Minify：

const MinifyPlugin = require('uglifyjs-webpack-plugin');

在不转换的情况下缩小您的ES6代码
为了仅与支持您正在使用的ES6功能的浏览器兼容，请使用Babel Minify进行缩小而不进行转换：

安装babel-minify-webpack-plugin

npm install babel-minify-webpack-plugin --save-dev

或者：

yarn add babel-minify-webpack-plugin --dev

将此添加到webpack.config.js：

const MinifyPlugin = require('babel-minify-webpack-plugin');

module.exports = {
  // ...
  plugins: [
    new MinifyPlugin()
  ]
};

Babel Minify的默认设置对我来说很好，但您可以在此处看到可以自定义的更多选项：https://github.com/webpack-contrib/babel-minify-webpack-plugin

Answer 2

以下是我的webpack配置文件。我正在使用webpack 2.3.1与react-router的动态路由。希望它可以帮到你。

var path = require('path');
var webpack = require('webpack');
var package=require('./package.json');
var config = require('./config');
var ManifestPlugin = require('webpack-manifest-plugin');


const ExtractTextPlugin = require('extract-text-webpack-plugin');
var getPlugins = function(){
  var pluginsList = [
    new webpack.optimize.CommonsChunkPlugin({
      name: 'vendor',
      minChunks: Infinity,
      filename: 'vendor.bundle_[hash].js'
    }),

    new webpack.DefinePlugin({
      "process.env": {
         NODE_ENV: JSON.stringify("production")
       }
    }),
    new webpack.NamedModulesPlugin(),
    new ManifestPlugin({
      fileName: 'build-manifest.json'
    })
  ];
    pluginsList.push(new webpack.LoaderOptionsPlugin({
      minimize: true,
      debug: false
    }));
    pluginsList.push(new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      },
      output: {
        comments: false
      },
      sourceMap: false,
      minimize: true
    }));
  return pluginsList;
}



module.exports = {
  cache: true,
  output: {
    path:path.join(__dirname, "dist/js"),
    filename: "[name]_[hash].js",
    chunkFilename:"[name]_[hash].js",
    publicPath:config.envConfig.JS_ASSETS_PATH
  },
  devServer: {
    contentBase: path.join(__dirname, "dist"),
    compress: true,
    port: 8080
  },

  entry: {
    index: [
      package.paths.app
    ],
    vendor: [
      'react', 'react-dom','phrontend',
      'react-ga'
    ]
  },
  plugins: getPlugins(),
  target: 'web',

  module: {
    rules: [
      {
        test: /.jsx?$/,
        exclude: /node_modules/,
        use: [{
          loader: 'babel-loader',
        }]
      }
    ]
  },
};

使用babel

2 个答案: