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const path = require('path')const uglifyPlugin = require('uglifyjs-webpack-plugin'); //const isProduction = process.env.NODE_ENV === 'production';function resolve(dir) {  return path.join(__dirname, dir)}module.exports = {  publicPath: './',  outputDir: 'dist',  lintOnSave: true,  devServer: {    compress: false,//开启压缩  },  css: {    extract: true,//是否使用css分离插件    sourceMap: false,//主要为方便开发人员的错误定位,为true会大大延长打包时间    loaderOptions: {      sass: {        data: `@import "@/assets/index.scss"`      }    },    module: false,  },  // webpack配置  chainWebpack: config => {    config.resolve.alias      .set("@", resolve("src"))    if (isProduction) {      config.plugins.delete('preload');      config.plugins.delete('prefetch');      config.optimization.minimize(true);      config.optimization.splitChunks({        chunks: 'all'      })      // 生产环境注入cdn    }  },  configureWebpack: config => {    if (isProduction) {      config.plugins.push(        new uglifyPlugin({          uglifyOptions: {            compress: {              drop_debugger: true,              drop_console: true,            }          },          sourceMap: false,          parallel: true,//使用多进程运行来提高构建速度        })      )    } else {    }  },  productionSourceMap: false,  parallel: require('os').cpus.length > 1}

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