text: "use strict";
  const path = require("path");
  const defaultSettings = require("./src/settings.js");
  function resolve(dir) {
    return path.join(__dirname, dir);
  }
  
  const name = defaultSettings.title || "vue Admin Template"; // page title
  
  // If your port is set to 80,
  // use administrator privileges to execute the command line.
  // For example, Mac: sudo npm run
  // You can change the port by the following methods:
  // port = 9528 npm run dev OR npm run dev --port = 9528
  const port = process.env.port || process.env.npm_config_port || 9528; // dev port
  
  // All configuration item explanations can be find in https://cli.vuejs.org/config/
  module.exports = {
    /**
     * You will need to set publicPath if you plan to deploy your site under a sub path,
     * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
     * then publicPath should be set to "/bar/".
     * In most cases please use '/' !!!
     * Detail: https://cli.vuejs.org/config/#publicpath
     */
    publicPath: "/",
    outputDir: "dist",
    assetsDir: "static",
    lintOnSave: false, // process.env.NODE_ENV === "development",
    productionSourceMap: false,
    devServer: {
      port: port,
      open: true,
      overlay: {
        warnings: false,
        errors: true
      },
      proxy: {
        [process.env.VUE_APP_BASE_API]: {
          target: process.env.VUE_APP_BASE_TARGET,
          // 配置跨域
          changeOrigin: true,
          pathRewrite: {
            ["^" + process.env.VUE_APP_BASE_API]: ""
          }
        },
        "/loc": {
          target: "http://116.228.187.106:5380",
          changeOrigin: true,
          pathRewrite: {
            "^/loc": ""
          }
        }
      }
      // before: require('./mock/mock-server.js')
    },
    configureWebpack: {
      // provide the app's title in webpack's name field, so that
      // it can be accessed in index.html to inject the correct title.
      name: name,
      resolve: {
        alias: {
          "@": resolve("src"),
          vendor: resolve("src/vendor")
        }
      },
      // 添加大打包element-ui和vue
      externals: {
        vue: "Vue",
        "element-ui": "ELEMENT"
      }
    },
    chainWebpack(config) {
      // Gzip压缩
      // 使用cdn方式引入element和vue
      const cdn = {
        css: [
          // element-ui css
          "https://unpkg.com/element-ui/lib/theme-chalk/index.css"
        ],
        js: [
          // vue must at first!
          "https://unpkg.com/vue/dist/vue.js",
          // element-ui js
          "https://unpkg.com/element-ui/lib/index.js"
        ]
      };
      config.plugin("html").tap(args => {
        args[0].cdn = cdn;
        return args;
      });
      // it can improve the speed of the first screen, it is recommended to turn on preload
      config.plugin("preload").tap(() => [
        {
          rel: "preload",
          // to ignore runtime.js
          // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
          fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
          include: "initial"
        }
      ]);
  
      // when there are many pages, it will cause too many meaningless requests
      config.plugins.delete("prefetch");
  
      // set svg-sprite-loader
      config.module
        .rule("svg")
        .exclude.add(resolve("src/icons"))
        .end();
      config.module
        .rule("icons")
        .test(/\.svg$/)
        .include.add(resolve("src/icons"))
        .end()
        .use("svg-sprite-loader")
        .loader("svg-sprite-loader")
        .options({
          symbolId: "icon-[name]"
        })
        .end();
  
      config.when(process.env.NODE_ENV !== "development", config => {
        config
          .plugin("ScriptExtHtmlWebpackPlugin")
          .after("html")
          .use("script-ext-html-webpack-plugin", [
            {
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }
          ])
          .end();
        config.optimization.splitChunks({
          chunks: "all",
          cacheGroups: {
            libs: {
              name: "chunk-libs",
              test: /[\\/]node_modules[\\/]/,
              priority: 10,
              chunks: "initial" // only package third parties that are initially dependent
            },
            elementUI: {
              name: "chunk-elementUI", // split elementUI into a single package
              priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
              test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
            },
            commons: {
              name: "chunk-commons",
              test: resolve("src/components"), // can customize your rules
              minChunks: 3, //  minimum common number
              priority: 5,
              reuseExistingChunk: true
            }
          }
        });
        // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
        config.optimization.runtimeChunk("single");
      });
    }
  };
  