webpack.config.js

const path = require("path");
const ESLintPlugin = require("eslint-webpack-plugin");
const Dotenv = require("dotenv-webpack");
const CopyPlugin = require("copy-webpack-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");

const isProduction = (mode) => mode === "production";

/** @return {import('webpack').Configuration} */
module.exports = (_, { mode }) => ({
  mode,
  entry: "./src/index.ts",
  output: {
    filename: "bundle.js",
    path: path.join(__dirname, "dist"),
  },
  module: {
    rules: [
      {
        test: /\.ts$/,
        exclude: /node_modules/,
        use: "ts-loader",
      },
    ],
  },
  plugins: [
    new ESLintPlugin(),
    new Dotenv({
      systemvars: true,
    }),
    new CopyPlugin({
      patterns: [{ from: "public" }],
    }),
    new HtmlWebpackPlugin({
      template: "index.html",
    }),
    new CleanWebpackPlugin(),
  ],
  resolve: {
    extensions: [".ts", ".js"],
  },
  devtool: isProduction(mode) ? false : "inline-source-map",
});