//webpack.dev.js

const webpack=require(‘webpack‘)
const merge = require(‘webpack-merge‘)
//引入公共的webpack配置
const baseConfig=require(‘./webpack.base‘)

const devConfig={
  mode: ‘development‘, 
  devtool: ‘cheap-module-eval-source-map‘,
//热模块更新，开发环境独有
  plugins: [
    new webpack.HotModuleReplacementPlugin()
  ],
//树摇配置，开发环境默认没有，需要配置
  optimization: {
    usedExports: true
  },
//自启服务
  devServer: {
    contentBase: ‘./dist‘,
    // open: true, //自动打开浏览器
    // port: 8080,
    hot: true,　//启用webpack的热模块替换功能
    //hotOnly: true　
    //devServer.hot在没有页面刷新的情况下启用热模块替换作为构建失败时的后备
  }
}
//将公告配置和开发配置合并暴露出去
module.exports=merge(baseConfig,devConfig)

//webapck.prod.js

const merge = require(‘webpack-merge‘)
const baseConfig=require(‘./webpack.base‘)

const prodConfig={
  mode: ‘production‘, 
  devtool: ‘cheap-module-source-map‘
}

module.exports=merge(baseConfig,prodConfig)

//webpack.base.js

const path = require(‘path‘)
const htmlWebpackPlugin = require(‘html-webpack-plugin‘)
const cleanWebpackPlugin = require(‘clean-webpack-plugin‘)

module.exports={
  entry: {
    main: ‘./src/index.js‘
  },
  output: {
    filename: ‘[name].js‘,
    path: path.resolve(__dirname,‘dist‘)
  },
  module: {
    rules:[
      {
        test: /\.(png|jpg|gif)$/,
        use: {
          loader: ‘url-loader‘,
          options: {
            name: ‘[name].[ext]‘, 
            outputPath: ‘images/‘, 
            limit: 2048           
          }
        }
      },
      {
        test: /\.css$/,
        use:[
          ‘style-loader‘,
          ‘css-loader‘,
          ‘postcss-loader‘ 
        ]
      },
      {
        test: /\.scss$/,
        use:[
          ‘style-loader‘,
          {
            loader: ‘css-loader‘,
            options: {
              importLoaders: 2,
              modules: true 
            }
          },
          ‘sass-loader‘,
          ‘postcss-loader‘
        ]
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: ‘babel-loader‘
      }
    ]
  },
  plugins: [
    new htmlWebpackPlugin({
      template: ‘./index.html‘
    }),
    new cleanWebpackPlugin(),
  ]
}

{
  "scripts": {
    "dev": "webpack-dev-server --config ./build/webpack.dev.js",
    "build": "webpack --config ./build/webpack.prod.js"
  },
}