webpack.config.js

const path = require("path");
const HTMLWebpackPlugin = require("html-webpack-plugin");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const OptimizeCSSAssetPlugin = require("optimize-css-assets-webpack-plugin");
const TerserWebpackPlugin = require("terser-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

const isDev = process.env.NODE_ENV === "development";
const isProd = !isDev;

const optimization = () => {
  const config = {
    splitChunks: {
      chunks: "all",
    },
  };

  // for another way use: webpack-merge
  // npm: "dev": "webpack --config webpack.dev.js"
  if (isProd) {
    config.minimizer = [
      new OptimizeCSSAssetPlugin(),
      new TerserWebpackPlugin(),
    ];
  }
};

module.exports = {
  context: path.resolve(__dirname, "src"),
  mode: "development",
  // devtool: "none",
  entry: {
    main: ["@babel/polyfill", "./javascript/script.js", "./styles/style.css"],
    analytics: "./typescript/analytics.ts",
    vendor: "./javascript/vendor.js",
  },
  output: {
    filename: "[name].[contenthash].js",
    path: path.resolve(__dirname, "dist"),
  },
  resolve: {
    extensions: [".js", ".json"],
    alias: {
      "@components": path.resolve(__dirname, "src/javascript/components"),
      "@javascript": path.resolve(__dirname, "src/javascript"),
      "@": path.resolve(__dirname, "src"),
    },
  },
  optimization: optimization(),
  plugins: [
    new HTMLWebpackPlugin({
      template: "./index.html",
      minify: {
        removeAttributeQuotes: isProd,
        collapseWhitespace: isProd,
        removeComments: isProd,
      },
    }),
    new CleanWebpackPlugin(),
    new MiniCssExtractPlugin({
      filename: "[name].[contenthash].css",
    }),
    new CopyWebpackPlugin([
      {
        from: path.resolve(__dirname, "src/favicon.ico"),
        to: path.resolve(__dirname, "dist"),
      },
    ]),
  ],
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, "css-loader"],
      },
      {
        test: /\.html$/,
        use: ["html-loader"],
      },
      {
        test: /\.(png|jpg|svg|gif)$/,
        use: {
          loader: "file-loader",
          options: {
            esModule: false,
            name: "[name].[hash].[ext]",
            outputPath: "imgs",
          },
        },
      },
      {
        test: /\.(ttf|woff|woff2|eot)$/,
        use: ["file-loader"],
      },
      {
        test: /\.xml$/,
        use: ["xml-loader"],
      },
      {
        test: /\.csv$/,
        use: ["csv-loader"],
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env"],
            plugins: ["@babel/plugin-proposal-class-properties"],
          },
        },
      },
      {
        test: /\.ts$/,
        exclude: /node_modules/,
        loader: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env", "@babel/preset-typescript"],
            plugins: ["@babel/plugin-proposal-class-properties"],
          },
        },
      },
    ],
  },
};