"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,
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true,
    },
    proxy: {
      "/api": {
        target: "https://heimahr.itheima.net",
      },
    },
    // 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"),
      },
    },
    // 配置需要排出的包
    externals: {
      // vue: "Vue",
      // "element-ui": "ELEMENT",
      // "cos-js-sdk-v5": "COS",
    },
  },
  chainWebpack(config) {
    // 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");

    // 这段代码的作用是将'src/icons'目录下的SVG图标文件通过'svg-sprite-loader'处理，并生成一个包含所有图标的SVG sprite文件。
    // 生成的symbol的id格式为'icon-[name]'，其中[name]会被替换为原始文件的名称。其他目录下的SVG文件将不会被处理。
    config.module
      // 定义一个名为'svg'的规则。
      .rule("svg")
      // 将'src/icons'目录添加到排除列表中，意味着该目录下的SVG文件不会被这个规则处理
      .exclude.add(resolve("src/icons"))
      // 结束对该规则的链式调用。
      .end();
    config.module
      //定义一个名为'icons'的规则。
      .rule("icons")
      // 指定该规则只匹配以'.svg'结尾的文件。
      .test(/\.svg$/)
      // 将'src/icons'目录添加到包含列表中，意味着只有该目录下的SVG文件会被这个规则处理。
      .include.add(resolve("src/icons"))
      // 结束对该规则的链式调用。
      .end()
      // 使用名为'svg-sprite-loader'的loader。
      .use("svg-sprite-loader")
      // 指定使用'svg-sprite-loader'来处理匹配到的文件。
      .loader("svg-sprite-loader")
      // 传递一些选项给'svg-sprite-loader'，这里设置了生成的symbol的id格式为'icon-[name]'，其中[name]会被替换为原始文件的名称。
      .options({
        symbolId: "icon-[name]",
      })
      // 结束对loader的链式调用。
      .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");
    });
  },
};