"use strict";
const px2rem = require("postcss-px2rem");
const path = require("path");
const postcss = px2rem({
  remUnit: 20, //基准大小 baseSize，需要和rem.js中相同
});

const defaultSettings = require("./src/settings.js");

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

const name = defaultSettings.title; // page title

module.exports = {
  publicPath: "./",
  lintOnSave: process.env.NODE_ENV === "dev",
  productionSourceMap: false,
  configureWebpack: (config) => {
    config.name = name;
    config.externals = {
      BMap: "BMap",
    };
    config.resolve.modules = [path.resolve("node_modules"), "node_modules"];

    // 是否生产环境
    if (process.env.NODE_ENV !== "dev") {
      // 忽略输出 Pass true to discard calls to console.* functions.
      config.optimization.minimizer[0].options.terserOptions.compress.drop_console = true;
    }
  },
  css: {
    loaderOptions: {
      css: {},
      postcss: {
        plugins: [postcss],
      },
    },
  },
  devServer: {
    https: false,
  },
  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");

    // swf loader
    config.module
      .rule("swf")
      .test(/\.swf/)
      .use("url-loader")
      .loader("url-loader")
      .options({ limit: 10000 });

    config.when(process.env.NODE_ENV !== "dev", (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");
    });
  },
};