新版的 vue-cli 构建的项目没有 dev-server.js 如何配置 proxyTable 。
与之替代的是 webpack.dev.conf.js 配置文件。但是该工程并没有默认依赖插件 http-proxy-middleware。
我尝试使用之前的配置方式，先安装了依赖，然后在 build/index.js 的 dev 中将 proxyTable 做如下配置：

dev: {

    // Paths
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    proxyTable: {
      '/api': {
        target: 'http://api.xxx.com',
        changeOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      }
    },

    // Various Dev Server settings
    host: 'localhost', // can be overwritten by process.env.HOST
    port: 8080, // can be overwritten by process.env.HOST, if port is in use, a free one will be determined
    autoOpenBrowser: false,
    errorOverlay: true,
    notifyOnErrors: true,
    poll: false, // https://webpack.js.org/configuration/dev-server/#devserver-watchoptions-

    // Use Eslint Loader?
    // If true, your code will be linted during bundling and
    // linting errors and warnings will be shown in the console.
    useEslint: true,
    // If true, eslint errors and warnings will also be shown in the error overlay
    // in the browser.
    showEslintErrorsInOverlay: false,

    /**
     * Source Maps
     */

    // https://webpack.js.org/configuration/devtool/#development
    devtool: 'eval-source-map',

    // If you have problems debugging vue-files in devtools,
    // set this to false - it *may* help
    // https://vue-loader.vuejs.org/en/options.html#cachebusting
    cacheBusting: true,

    // CSS Sourcemaps off by default because relative paths are "buggy"
    // with this option, according to the CSS-Loader README
    // (https://github.com/webpack/css-loader#sourcemaps)
    // In our experience, they generally work as expected,
    // just be aware of this issue when enabling this option.
    cssSourceMap: false,
  }

重新 run 之后发现不起作用，请求地址没有正确转换，仍然是 http://localhost:8080/api/xxx 这样的格式。

求助一下新版的 vue 脚手架构建的项目如何正确配置 proxyTable 。

说明：新版的 build 目录中没有 dev-server.js 和 dev-client.js 这两个文件，也没有默认依赖 http-proxy-middleware 插件。