webpack_test.js

const path = require('path');
const webpack = require('webpack');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const WebkitPrefixer = require('autoprefixer');
const WebpackMd5Hash = require('webpack-md5-hash');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const Dashboard = require('webpack-dashboard');
const DashboardPlugin = require('webpack-dashboard/plugin');

const dashboard = new Dashboard();

module.exports = (env = 'dev') => {
  // 生成环境下webpack使用-p参数开启代码压缩
  // webpack[-dev-server]使用--env dev参数指定编译环境
  const isDev = env === 'dev';
  const sourcedir = path.resolve(__dirname, 'src');// 源码和资源文件的放置位置
  const outputdir = path.resolve(__dirname, 'build');// 编译结果的放置位置
  const webContextRoot = '/myreact/';// 应用的实际访问路径，默认是'/'
  // antd的图标字体文件的实际访问路径，利用less-load的变量替换功能
  const antdFonticon = `${webContextRoot}assets/antdFonticon/iconfont`;
  const hasValue = (item) => item !== null;
  return {
    // context: path.resolve( __dirname ),
    devtool: 'source-map',
    devServer: {
      host: '0.0.0.0',
      port: 8082,
      historyApiFallback: true
    },
    resolve: {
      // 让less-loader等插件能找到以~相对定位的资源
      modules: [sourcedir, 'node_modules']
    },
    entry: {
      main: [
        // 编译新版本js的新api(如Promise)，主要是让IE11能够执行编译后的代码
        'babel-polyfill',
        // 使用react-hot-loader@3.0.0-beta.6，
        // 搭配webpack-dev-server --hot命令实现react组件的hot reload
        isDev ? 'react-hot-loader/patch' : null,
        path.resolve(sourcedir, 'main.jsx')].filter(hasValue),
      // 第三方库汇总输出
      vendor: ['bootstrap/dist/css/bootstrap.min.css', 'react',
        'react-dom', 'react-router', 'redux', 'react-redux',
        'react-router-redux', 'moment', 'lodash', 'immutable', 'whatwg-fetch',
        // 只含antd的js部分
        'antd',
        // 各控件还需引入各自的样式文件
        'antd/lib/style/index.less']
    },
    output: {
      path: outputdir,
      filename: isDev ? 'js/[name].js' : 'js/[name]_[chunkhash:8].js',
      // 使用require.ensure造成的延迟加载的代码文件
      chunkFilename: isDev ? 'js/chunk_[id]_[name].js'
        : 'js/chunk_[name]_[chunkhash:8].js',
      publicPath: webContextRoot
    },
    module: {
      rules: [
        {
          test: /\.jsx?$/,
          exclude: /(node_modules|bower_components)/,
          use: [{
            // 编译新版本js语法为低版本js语法
            loader: 'babel-loader',
            options: {
              presets: [
                // 编译es2015版本的js
                ['babel-preset-es2015', {
                  modules: false
                }], 'babel-preset-stage-2',
                // 编译jsx
                'babel-preset-react'],
              plugins: [// 支持热加载react组件
                isDev ? 'react-hot-loader/babel' : null,
                // 减少重复的编译后的辅助方法
                'babel-plugin-transform-runtime',
                // 按需加载组件的代码和样式
                ['babel-plugin-import', {
                  libraryName: 'antd',
                  style: true
                }]].filter(hasValue)
            }
          }]
        },
        {
          test: /\.css$/,
          use: ['style-loader',
            {
              loader: 'css-loader',
              options: {
                // 第三方组件未以module方式引入css，所以不能在全局开启css module
                modules: false
              }
            },
            {
              loader: 'postcss-loader',
              options: {
                plugins: [WebkitPrefixer]
              }
            }
          ]
        },
        {
          test: /\.less$/,
          use: ['style-loader',
            {
              loader: 'css-loader',
              options: {
                modules: false
              }
            },
            {
              loader: 'postcss-loader',
              options: {
                plugins: [WebkitPrefixer]
              }
            },
            {
              loader: 'less-loader',
              options: {
                modules: false,
                modifyVars: {
                  // 替换antd用到的字体文件路径
                  'icon-url': JSON.stringify(antdFonticon)
                }
              }
            }]
        },
        {
          test: /\.(jpg|png|gif)$/,
          use: {
            loader: 'url-loader',
            options: {
              // 编码为dataUrl的最大尺寸
              limit: 10000,
              // 输出路径，相对于publicPath
              outputPath: 'assets/',
              name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'
            }
          }
        },
        {
          test: /\.(woff|woff2)(\?v=\d+\.\d+\.\d+)?$/,
          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+)?$/,
          use: {
            loader: 'url-loader',
            options: {
              limit: 10000,
              mimetype: 'application/svg+xml',
              outputPath: 'assets/',
              name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'
            }
          }
        }]
    },
    plugins: [
      // 命令行输出仪表盘
      new DashboardPlugin(dashboard.setData),
      // momentjs包含大量本地化代码，需筛选
      // new webpack.ContextReplacementPlugin(/moment[\/\\]locale$/, /en-ca|zh-cn/),
      new webpack.ContextReplacementPlugin(/moment[\\]locale$/, /en-ca|zh-cn/),
      new webpack.optimize.OccurrenceOrderPlugin(true),
      // 复制无需编译的文件至输出目录
      new CopyWebpackPlugin([{
        from: path.resolve(sourcedir, 'assets'),
        to: 'assets'
      }]),
      // 修复webpack的chunkhash不以chunk文件实际内容为准的问题
      new WebpackMd5Hash(),
      // 单独打包输出第三方组件，和webpack生成的运行时代码
      new webpack.optimize.CommonsChunkPlugin({
        name: ['vendor', 'manifest']
      }),
      // 自动填充js、css引用进首页
      new HtmlWebpackPlugin({
        title: 'wzp react',
        template: path.resolve(sourcedir, 'index.html'),
        inject: 'body' // Inject all scripts into the body
      }),
      // 设置环境变量
      new webpack.DefinePlugin({
        process: {
          env: {
            // process.env.NODE_ENV==="production"
            // 应用代码里，可凭此判断是否运行在生产环境
            NODE_ENV: isDev ? JSON.stringify('development')
              : JSON.stringify('production')
          }
        }
      }),
      // print more readable module names on HMR updates
      isDev ? new webpack.NamedModulesPlugin() : null,
      // 先清理输出目录
      isDev ? null : new CleanWebpackPlugin([outputdir]),
      // 排除特定库
      isDev ? null : new webpack.IgnorePlugin(/.*/, /react-hot-loader$/),
      // 输出报告，查看第三方库的大小
      isDev ? null : new BundleAnalyzerPlugin(
        {
          analyzerMode: 'static',
          reportFilename: 'report.html',
          openAnalyzer: true,
          generateStatsFile: false
        })
    ].filter(hasValue)
  };
};