const path = require("path");
// const CompressionWebpackPlugin = require("compression-webpack-plugin");

function resolve(dir) {
  return path.join(__dirname, dir);
}

const isProd = process.env.NODE_ENV === "production";

module.exports = {
  productionSourceMap: false,
  outputDir: "dist",
  publicPath: "./",
  lintOnSave: !isProd,
  devServer: {
    port: 8080,
    open: true,
    overlay: {
      warnings: false,
      errors: true,
    },
    // proxy: {
    //   "/service_api": {
    //     target: "http://localhost:4000",
    //     changeOrigin: true,
    //   },
    // },
  },

  configureWebpack: {
    name: process.env.VUE_APP_BASE_NAME,
    resolve: {
      alias: {
        "@": resolve("src"),
      },
    },
    externals: {},
  },
  chainWebpack(config) {
    config.plugins.delete("prefetch");
    config.plugins.delete("preload");
    // 设置svg
    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();

    //设置开发环境sourceMap
    config.when(!isProd, (config) => config.devtool("cheap-source-map"));
    //生产环境
    config.when(isProd, (config) => {
      config.optimization.splitChunks({
        chunks: "all",
        cacheGroups: {
          libs: {
            name: "chunk-libs",
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: "initial",
          },
          elementUI: {
            name: "chunk-elementUI",
            priority: 20,
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/,
          },
          commons: {
            name: "chunk-commons",
            test: resolve("src/components"),
            minChunks: 3,
            priority: 5,
            reuseExistingChunk: true,
          },
        },
      });

      config.optimization.runtimeChunk("single");

      //去除生产环境debugger 和console
      config.optimization.minimizer("terser").tap((args) => {
        args[0].terserOptions.compress.warnings = false;
        args[0].terserOptions.compress.drop_console = true;
        args[0].terserOptions.compress.drop_debugger = true;
        args[0].terserOptions.compress.pure_funcs = ["console.*"];
        return args;
      });
      //g-zip开启
      // config.plugin("CompressionWebpackPlugin").use(CompressionWebpackPlugin, [
      //   {
      //     filename: "[path].gz[query]",
      //     algorithm: "gzip",
      //     test: /\.js$|\.css/, //匹配文件名
      //     threshold: 10240, //对超过10k的数据压缩
      //     minRatio: 0.8,
      //   },
      // ]);
      //打包大小分析
      if (process.env.npm_config_report) {
        config
          .plugin("webpack-bundle-analyzer")
          .use(require("webpack-bundle-analyzer").BundleAnalyzerPlugin);
      }
    });
  },
};