text: const path = require("path");
  const HTMLWebpackPlugin = require("html-webpack-plugin");
  const { CleanWebpackPlugin } = require("clean-webpack-plugin");
  const CopyWebpackPlugin = require("copy-webpack-plugin");
  const MiniCssExtractPlugin = require("mini-css-extract-plugin");
  const OptimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-plugin");
  const TerserWebpackPlugin = require("terser-webpack-plugin");
  
  const isDev = process.env.NODE_ENV === "development";
  const isProd = !isDev;
  
  const optimization = () => {
    const config = {
      splitChunks: {
        chunks: "all",
      },
    };
  
    if (isProd) {
      config.minimizer = [
        new OptimizeCssAssetsWebpackPlugin(),
        new TerserWebpackPlugin(),
      ];
    }
  
    return config;
  };
  
  const filename = (ext, path = "") =>
    isDev ? `${path}[name].${ext}` : `[hash].${ext}`;
  
  const cssLoaders = (extra) => {
    const loaders = [
      {
        loader: MiniCssExtractPlugin.loader,
        options: {
          hmr: isDev,
          name: filename("[ext]"),
          reloadAll: true,
        },
      },
      "css-loader",
    ];
  
    if (extra) {
      loaders.push(extra);
    }
  
    return loaders;
  };
  
  const babelOptions = (preset) => {
    const opts = {
      presets: ["@babel/preset-env"],
      plugins: ["@babel/plugin-proposal-class-properties"],
    };
  
    if (preset) {
      opts.presets.push(preset);
    }
  
    return opts;
  };
  
  module.exports = {
    context: path.resolve(__dirname, "src"),
    mode: "development",
    entry: {
      main: ["@babel/polyfill", "./index.js"],
    },
  
    output: {
      filename: filename("js"),
      path: path.resolve(__dirname, "dist"),
    },
    resolve: {
      extensions: [".js", ".json", ".jsx"],
      alias: {
        "@models": path.resolve(__dirname, "src/models"),
        "@": path.resolve(__dirname, "src"),
      },
    },
    optimization: optimization(),
  
    devServer: {
      port: "4020",
      hot: isDev,
    },
    devtool: isDev ? "source-map" : "",
  
    plugins: [
      new HTMLWebpackPlugin({
        // title: 'Webpack course',
        template: "./index.html",
        minify: {
          collapseWhitespace: isProd,
        },
      }),
  
      new CleanWebpackPlugin(),
      new CopyWebpackPlugin({
        patterns: [
          {
            from: path.resolve(__dirname, "src/img/favicon.ico"),
            to: path.resolve(__dirname, "dist/img"),
          },
        ],
      }),
      new MiniCssExtractPlugin({
        filename: filename("css"),
      }),
    ],
  
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /node_modules/,
          use: [
            {
              loader: "babel-loader",
              options: babelOptions(),
            },
            // 'eslint-loader',
          ],
        },
        {
          test: /\.css$/,
          use: cssLoaders(),
        },
        {
          test: /\.s[ac]ss$/,
          use: cssLoaders("sass-loader"),
        },
        {
          test: /\.(png|jpg|svg|gif|webp)$/,
          loader: "file-loader",
          options: {
            name: "[path][name].[ext]",
          },
        },
        {
          test: /\.(woff|woff2|ttf|eot)$/,
          loader: "file-loader",
          options: {
            name: filename("[ext]", "[path]"),
          },
        },
      ],
    },
  };
  