'use strict'module.exports = function( env ) {  // 生成環境下webpack使用-p參數開啟代碼壓縮  // webpack[-dev-server]使用--env dev參數指定編譯環境  var isDev = env == 'dev';  var path = require( 'path' );  var webpack = require( 'webpack' );  var CleanWebpackPlugin = require( 'clean-webpack-plugin' );  var CopyWebpackPlugin = require( 'copy-webpack-plugin' );  var HtmlWebpackPlugin = require( 'html-webpack-plugin' );  var WebkitPrefixer = require( 'autoprefixer' );  var WebpackMd5Hash = require( 'webpack-md5-hash' );  var BundleAnalyzerPlugin = require( 'webpack-bundle-analyzer' ).BundleAnalyzerPlugin;  var sourcedir = path.resolve( __dirname, 'src' );// 源碼和資源文件的放置位置  var outputdir = path.resolve( __dirname, 'build' );// 編譯結果的放置位置  var webContextRoot = '/myreact/';// 應用的實際訪問路徑，默認是'/'  // antd的圖標字體文件的實際訪問路徑，利用less-load的變量替換功能  var antd_fonticon = webContextRoot + 'assets/antd_fonticon/iconfont';  var hasValue = function( item ) { return item != null; };  return {    //context: path.resolve( __dirname ),    devtool: 'source-map',    devServer: {      host: '0.0.0.0',      port: 8082,      historyApiFallback: true    },    resolve: {      // 讓less-loader等插件能找到以~相對定位的資源      modules: [sourcedir, 'node_modules']    },    entry: {      main: [        // 編譯新版本js的新api(如Promise)，主要是讓IE11能夠執行編譯后的代碼        'babel-polyfill',        //使用react-hot-loader@3.0.0-beta.6，        // 搭配webpack-dev-server --hot命令實現react組件的hot reload        isDev ? 'react-hot-loader/patch' : null,        path.resolve( sourcedir, 'main.jsx' )].filter( hasValue ),      // 第三方庫匯總輸出      vendor: ['bootstrap/dist/css/bootstrap.min.css', 'react',        'react-dom', 'react-router', 'redux', 'react-redux',        'react-router-redux', 'moment', 'lodash', 'immutable', 'whatwg-fetch',        // 只含antd的js部分        'antd',        // 各控件還需引入各自的樣式文件        'antd/lib/style/index.less']    },    output: {      path: outputdir,      filename: isDev ? 'js/[name].js' : 'js/[name]_[chunkhash:8].js',      // 使用require.ensure造成的延遲加載的代碼文件      chunkFilename: isDev ? 'js/chunk_[id]_[name].js'        : 'js/chunk_[name]_[chunkhash:8].js',      publicPath: webContextRoot    },    module: {      rules: [{        test: //.jsx?$/,        exclude: /(node_modules|bower_components)/,        use: [{          // 編譯新版本js語法為低版本js語法          loader: 'babel-loader',          options: {            presets: [              // 編譯es2015版本的js              ['babel-preset-es2015', {                modules: false              }], 'babel-preset-stage-2',              // 編譯jsx              'babel-preset-react'],            plugins: [// 支持熱加載react組件              isDev ? 'react-hot-loader/babel' : null,              // 減少重復的編譯后的輔助方法              'babel-plugin-transform-runtime',              // 按需加載組件的代碼和樣式              ['babel-plugin-import', {                libraryName: 'antd',                style: true              }]].filter( hasValue )          }        }]      }, {        test: //.css$/,        use: ['style-loader',          {            loader: 'css-loader',            options: {              // 第三方組件未以module方式引入css，所以不能在全局開啟css module              modules: false            }          },          { loader: 'postcss-loader', options: { plugins: [WebkitPrefixer] } }]      }, {        test: //.less$/,        use: ['style-loader',          {            loader: 'css-loader',            options: {              modules: false            }          },          { loader: 'postcss-loader', options: { plugins: [WebkitPrefixer] } },          {            loader: 'less-loader',            options: {              modules: false,              modifyVars: {                // 替換antd用到的字體文件路徑                "icon-url": JSON.stringify( antd_fonticon )              }            }          }]      }, {        test: //.(jpg|png|gif)$/,        use: {          loader: 'url-loader',          options: {            // 編碼為dataUrl的最大尺寸            limit: 10000,            // 輸出路徑，相對于publicPath            outputPath: 'assets/',            name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'          }        }      }, {        test: //.(woff|woff2)(/?v=/d+/./d+/./d+)?$/,        use: {          loader: 'url-loader',          options: {            limit: 10000,            mimetype: 'application/font-woff',            outputPath: 'assets/',            name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'          }        }      }, {        test: //.ttf(/?v=/d+/./d+/./d+)?$/,        use: {          loader: 'url-loader',          options: {            limit: 10000,            mimetype: 'application/octet-stream',            outputPath: 'assets/',            name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'          }        }      }, {        test: //.eot(/?v=/d+/./d+/./d+)?$/,        use: {          loader: 'url-loader',          options: {            limit: 10000,            mimetype: 'application/vnd.ms-fontobject',            outputPath: 'assets/',            name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'          }        }      }, {        test: //.svg(/?v=/d+/./d+/./d+)?$/,        use: {          loader: 'url-loader',          options: {            limit: 10000,            mimetype: 'application/svg+xml',            outputPath: 'assets/',            name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'          }        }      }]    },    plugins: [      // momentjs包含大量本地化代碼，需篩選      new webpack.ContextReplacementPlugin( /moment[////]locale$/, /en-ca|zh-cn/ ),      new webpack.optimize.OccurrenceOrderPlugin( true ),      // 復制無需編譯的文件至輸出目錄      new CopyWebpackPlugin( [{        from: path.resolve( sourcedir, 'assets' ),        to: 'assets'      }] ),      // 修復webpack的chunkhash不以chunk文件實際內容為準的問題      new WebpackMd5Hash(),      // 單獨打包輸出第三方組件，和webpack生成的運行時代碼      new webpack.optimize.CommonsChunkPlugin( {        name: ['vendor', 'manifest']      }),      // 自動填充js、css引用進首頁      new HtmlWebpackPlugin( {        title: 'wzp react',        template: path.resolve( sourcedir, 'index.html' ),        inject: 'body' // Inject all scripts into the body      }),      // 設置環境變量      new webpack.DefinePlugin( {        process: {          env: {            // process.env.NODE_ENV==="production"            // 應用代碼里，可憑此判斷是否運行在生產環境            NODE_ENV: isDev ? JSON.stringify( 'development' )              : JSON.stringify( 'production' )          }        }      }),      // print more readable module names on HMR updates      isDev ? new webpack.NamedModulesPlugin() : null,      // 先清理輸出目錄      isDev ? null : new CleanWebpackPlugin( [outputdir] ),      // 排除特定庫      isDev ? null : new webpack.IgnorePlugin( /.*/, /react-hot-loader$/ ),      // 輸出報告，查看第三方庫的大小      isDev ? null : new BundleAnalyzerPlugin(        {          analyzerMode: 'static',          reportFilename: 'report.html',          openAnalyzer: true,          generateStatsFile: false        })    ].filter( hasValue )  }};