base-wc-app/webpack.web.common.js

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

module.exports = {
  target: "web",
  module: {
    rules: [
      {
        exclude: [/node_modules/],
        test: /\.ts$/,
        loader: "ts-loader",
        options: { configFile: "tsconfig.web.json" },
      },
      {
        test: /\.(css|scss)$/,
        use: ["css-loader", "sass-loader"],
      },
      {
        test: /\.(png|jpg|gif)$/,
        type: "asset/resource",
      },
    ],
  },
  output: {
    filename: "bundle.[name].js",
    path: path.resolve(__dirname, "dist", "web"),
  },
  resolve: {
    extensions: [".ts", ".js"],
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: "./src/index.ejs",
      title: "My App",
    }),
    new CopyWebpackPlugin({
      patterns: [
        "./node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js",
        {
          from: "./node_modules/@webcomponents/webcomponentsjs/bundles",
          to: "bundles",
        },
      ],
    }),
    new Dotenv(),
  ],
};