"use strict";
const { defineConfig } = require("@vue/cli-service");
const CompressionWebpackPlugin = require("compression-webpack-plugin");
const isProduction = process.env.NODE_ENV === "production";
const path = require("path");
const MomentLocalesPlugin = require("moment-locales-webpack-plugin");
function resolve(dir) {
  return path.join(__dirname, dir);
}
const HappyPack = require("happypack");
const os = require("os");
const happyThreadPool = HappyPack.ThreadPool({ size: os.cpus().length });

module.exports = defineConfig({
  publicPath: "/",
  outputDir: "dist",
  assetsDir: "static",
  productionSourceMap: false,
  transpileDependencies: true,
  devServer: {
    host: "127.0.0.1",
    port: 9997,
    open: true,
    proxy: {}
  },
  configureWebpack: (config) => {
    config.plugins.push(
      new MomentLocalesPlugin({
        localesToKeep: ["zh-cn"]
      })
    );
    if (isProduction) {
      const productionGzipExtensions = ["html", "js", "css"];
      config.plugins.push(
        new CompressionWebpackPlugin({
          filename: "[path].gz[query]",
          algorithm: "gzip",
          test: new RegExp("\\.(" + productionGzipExtensions.join("|") + ")$"),
          threshold: 20480, // 只压缩大于 20KB 的文件
          minRatio: 0.8, // 压缩率小于 0.8 的才处理
          deleteOriginalAssets: false // 保留原文件
        })
      );
      config.plugins.push(
        new HappyPack({
          id: "happybabel",
          loaders: ["babel-loader"],
          threadPool: happyThreadPool
        })
      );
      // config.externals = {
      //   vue: "Vue",
      //   "vue-router": "VueRouter",
      //   axios: "axios",
      //   echarts: "echarts"
      // };
      config.optimization = {
        usedExports: true,
        sideEffects: true,
        splitChunks: {
          chunks: "all", // 对所有 chunk 进行分割
          minSize: 30000, // 模块大于 30KB 才会被分割
          maxSize: 0, // 不限制最大大小
          minChunks: 1, // 至少被引用 1 次
          maxAsyncRequests: 5, // 最大异步请求数
          maxInitialRequests: 3, // 最大初始请求数
          automaticNameDelimiter: "~", // 文件名分隔符
          cacheGroups: {
            vendors: {
              test: /[\\/]node_modules[\\/]/, // 分离 node_modules 中的模块
              priority: -10
            },
            default: {
              minChunks: 2, // 至少被引用 2 次的模块
              priority: -20,
              reuseExistingChunk: true // 重用已有的 chunk
            }
          }
        }
      };
    }
  },
  chainWebpack(config) {
    config.module.rule("svg").exclude.add(resolve("src/assets/svg")).end();
    config.module
      .rule("icons")
      .test(/\.svg$/)
      .include.add(resolve("src/assets/svg"))
      .end()
      .use("svg-sprite-loader")
      .loader("svg-sprite-loader")
      .options({ symbolId: "icon-[name]" })
      .end();
    config.module
      .rule("gltf-glb")
      .test(/\.(gltf|glb)$/)
      .use("file-loader")
      .loader("file-loader")
      .options({
        name: "static/models/[name].[hash:8].[ext]", // 输出路径和文件名
        esModule: false // 确保兼容传统导入方式
      })
      .end();
    config.plugin("html").tap((args) => {
      args[0].title = "铁塔_web服务平台";
      return args;
    });
    config.resolve.alias.set("@", resolve("src"));
  }
});