1 'use strict'
  2
  3 // build/util.js
  4 const utils = require('./utils')
  5 // node_modules里面的webpack
  6 const webpack = require('webpack')
  7 // config/index.js
  8 const config = require('../config')
  9 // 对象合并
 10 const merge = require('webpack-merge')
 11 // 路径
 12 const path = require('path')
 13
 14
 15 // 引入webpack.base.conf.js配置
 16 const baseWebpackConfig = require('./webpack.base.conf')
 17 const CopyWebpackPlugin = require('copy-webpack-plugin')
 18 const HtmlWebpackPlugin = require('html-webpack-plugin')
 19 const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
 20 const portfinder = require('portfinder')
 21
 22 // 配置
 23 const HOST = process.env.HOST
 24 const PORT = process.env.PORT && Number(process.env.PORT)
 25
 26 const devWebpackConfig = merge(baseWebpackConfig, {
 27   module: {
 28     rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true })
 29   },
 30   // cheap-module-eval-source-map开发速度更快(只检测修改了的文件进行更新，而不是全部)
 31   devtool: config.dev.devtool,
 32
 33   /**
 34    *  这里配置开发服务器
 35    */
 36   devServer: {
 37     clientLogLevel: 'warning',
 38     historyApiFallback: {
 39       rewrites: [
 40         { from: /.*/, to: path.posix.join(config.dev.assetsPublicPath, 'index.html') },
 41       ],
 42     },
 43     // 是否开启HMR
 44     hot: true,
 45     // 内容
 46     contentBase: false, // 因为我们使用CopyWebpackPlugin
 47     // 是否压缩
 48     compress: true,
 49
 50     host: HOST || config.dev.host,
 51     port: PORT || config.dev.port,
 52
 53     // config => config/index.js
 54     open: config.dev.autoOpenBrowser,
 55
 56     overlay: config.dev.errorOverlay
 57       ? { warnings: false, errors: true }
 58       : false,
 59     publicPath: config.dev.assetsPublicPath,
 60     proxy: config.dev.proxyTable,
 61     // 如果不开启，则不提示友好的错误信息！
 62     quiet: true, // FriendlyErrorsPlugin所必需的
 63     watchOptions: {
 64       poll: config.dev.poll,
 65     }
 66   },
 67
 68   /**
 69    * 配置插件
 70    */
 71   plugins: [
 72     new webpack.DefinePlugin({
 73       'process.env': require('../config/dev.env')
 74     }),
 75     new webpack.HotModuleReplacementPlugin(),
 76     new webpack.NamedModulesPlugin(), // HMR在更新时在控制台中显示正确的文件名。
 77     new webpack.NoEmitOnErrorsPlugin(),
 78     // https://github.com/ampedandwired/html-webpack-plugin
 79     new HtmlWebpackPlugin({
 80       filename: 'index.html',
 81       template: 'index.html',
 82       inject: true
 83     }),
 84     // 复制到自定义静态源
 85     new CopyWebpackPlugin([
 86       {
 87         // 来自(可以是对象，可以是String)
 88         from: path.resolve(__dirname, '../static'),
 89         // 走向(可以是对象，可以是String)
 90         to: config.dev.assetsSubDirectory,
 91         // 忽略此类文件
 92         ignore: ['.*']
 93       }
 94     ])
 95   ]
 96 })
 97
 98 /**
 99  * 模块导出(Promise)
100  */
101 module.exports = new Promise((resolve, reject) => {
102   portfinder.basePort = process.env.PORT || config.dev.port
103   portfinder.getPort((err, port) => {
104
105     if (err) {
106       reject(err)
107     } else {
108       // 发布新的端口，这是e2e测试所必需的
109       process.env.PORT = port
110       // 添加开发服务器到端口地址
111       devWebpackConfig.devServer.port = port
112
113       // 添加 FriendlyErrorsPlugin
114       devWebpackConfig.plugins.push(new FriendlyErrorsPlugin({
115         compilationSuccessInfo: {
116           messages: [`Your application is running here: http://${devWebpackConfig.devServer.host}:${port}`],
117         },
118         onErrors: config.dev.notifyOnErrors
119           ? utils.createNotifierCallback()
120           : undefined
121       }))
122
123       resolve(devWebpackConfig)
124     }
125   })
126 })