vue-cli 3.x 构建项目，webpack没有了？

vue-cli 3.x 已经没有了webpack.config.js文件。取而代之的是创建一个vue.config.js文件。官网是这样介绍的

 vue.config.js

const path = require("path");
const resolve = dir => path.join(__dirname, dir);
//用于生产环境去除多余的css
const PurgecssPlugin = require("purgecss-webpack-plugin");
//全局文件路径
const glob = require("glob-all");
//压缩代码并去掉console
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
//代码打包zip
const CompressionWebpackPlugin = require("compression-webpack-plugin");
const productionGzipExtensions = /.(js|css|json|txt|html|ico|svg)(?.*)?$/i;
module.exports = {
  // 废弃baseUrl  一般运维会配置好的
  publicPath: process.env.NODE_ENV === "production" ? "/configtest/" : "/",
  //打包的输出目录
  outputDir: "dist/configtest",
  //保存是校验
  lintOnSave: true,
  //如果文件等设置
  pages: {
    index: {
      entry: "src/main.js",
      template: "public/index.html",
      filename: "index.html"
    }
  },
  //静态资源打包路径
  assetsDir: "static",
  //默认false 可以加快打包
  productionSourceMap: false,
  //打包后的启动文件
  indexPath: "congfigtest.html",
  //打包文件是否使用hash
  filenameHashing: true,
  runtimeCompiler: false,
  transpileDependencies: [],
  //打包的css路径及命名
  css: {
    modules: false,
    //vue 文件中修改css 不生效 注释掉  extract:true
    extract: {
      filename: "style/[name].[hash:8].css",
      chunkFilename: "style/[name].[hash:8].css"
    },
    sourceMap: false,
    loaderOptions: {
      css: {},
      less: {
        // 向全局less样式传入共享的全局变量
        // data: `@import "~assets/less/variables.less";$src: "${process.env.VUE_APP_SRC}";`
      },
      // postcss 设置
      postcss: {
        plugins: [
          require("postcss-px-to-viewport")({
            viewportWidth: 750, // 视窗的宽度，对应的是我们设计稿的宽度，一般是750
            viewportHeight: 1334, // 视窗的高度，根据750设备的宽度来指定，一般指定1334，也可以不配置
            unitPrecision: 3, // 指定`px`转换为视窗单位值的小数位数（很多时候无法整除）
            viewportUnit: "vw", // 指定需要转换成的视窗单位，建议使用vw
            selectorBlackList: [".ignore", ".hairlines"], // 指定不转换为视窗单位的类，可以自定义，可以无限添加,建议定义一至两个通用的类名
            minPixelValue: 1, // 小于或等于`1px`不转换为视窗单位，你也可以设置为你想要的值
            mediaQuery: false // 允许在媒体查询中转换`px`
          })
        ]
      }
    }
  },
  //webpack 链式配置   默认已经配置好了  node_moudles/@vue
  chainWebpack: config => {
    // 修复HMR
    config.resolve.symlinks(true);
    // 修复Lazy loading routes  按需加载的问题，如果没有配置按需加载不需要写，会报错
    // config.plugin("html").tap(args => {
    //   args[0].chunksSortMode = "none";
    //   return args;
    // });
    //添加别名
    config.resolve.alias
      .set("@", resolve("src"))
      .set("assets", resolve("src/assets"))
      .set("components", resolve("src/components"))
      .set("layout", resolve("src/layout"))
      .set("base", resolve("src/base"))
      .set("static", resolve("src/static"));
    // 压缩图片
    config.module
      .rule("images")
      .use("image-webpack-loader")
      .loader("image-webpack-loader")
      .options({
        mozjpeg: { progressive: true, quality: 65 },
        optipng: { enabled: false },
        pngquant: { quality: "65-90", speed: 4 },
        gifsicle: { interlaced: false },
        webp: { quality: 75 }
      });
  },
  //webpack 配置
  configureWebpack: config => {
    const plugins = [];
    //去掉不用的css 多余的css
    plugins.push(
      new PurgecssPlugin({
        paths: glob.sync([path.join(__dirname, "./**/*.vue")]),
        extractors: [
          {
            extractor: class Extractor {
              static extract(content) {
                const validSection = content.replace(
                  /<style([sS]*?)</style>+/gim,
                  ""
                );
                return validSection.match(/[A-Za-z0-9-_:/]+/g) || [];
              }
            },
            extensions: ["html", "vue"]
          }
        ],
        whitelist: ["html", "body"],
        whitelistPatterns: [/el-.*/],
        whitelistPatternsChildren: [/^token/, /^pre/, /^code/]
      })
    );
    //启用代码压缩
    plugins.push(
      new UglifyJsPlugin({
        uglifyOptions: {
          compress: {
            warnings: false,
            drop_console: true,
            drop_debugger: false,
            pure_funcs: ["console.log"] //移除console
          }
        },
        sourceMap: false,
        parallel: true
      })
    ),
      //代码压缩打包
      plugins.push(
        new CompressionWebpackPlugin({
          filename: "[path].gz[query]",
          algorithm: "gzip",
          test: productionGzipExtensions,
          threshold: 10240,
          minRatio: 0.8
        })
      );
    config.plugins = [...config.plugins, ...plugins];
  },
  parallel: require("os").cpus().length > 1,
  pluginOptions: {},
  pwa: {},
  //设置代理
  devServer: {
    port: 8080,
    host: "0.0.0.0",
    https: false,
    open: true,
    openPage: "about",
    hot: true,
    disableHostCheck: true,
    proxy: {
      "/api": {
        target: "https://cdn.awenliang.cn",
        ws: true,
        changeOrigin: true
      },
      "/foo": {
        target: "https://cdn.awenliang.cn",
        ws: true,
        changeOrigin: true
      }
    }
  }
};

　　babel.config.js

//npm i --save-dev babel-plugin-transform-remove-console
const plugins = [];
// if(['production', 'prod'].includes(process.env.NODE_ENV)) {
//   plugins.push("transform-remove-console")
// }
 
module.exports = {
  presets: [["@vue/app", { useBuiltIns: "entry" }]],
  plugins: plugins
};

　　postcss.config.js

const autoprefixer = require("autoprefixer");
let plugins = [];
module.exports = {
  plugins: [...plugins, autoprefixer]
};