webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const { DefinePlugin } = require("webpack");
const dotenv = require("dotenv");

module.exports = () => ({
  entry: "./src/index.js",
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, "dist"),
    clean: true,
    publicPath: "/",
  },
  devServer: { port: 3000, hot: true, historyApiFallback: true },
  module: {
    rules: [
      {
        test: /\.s?css$/i,
        use: ["style-loader", "css-loader", "sass-loader"],
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env"],
          },
        },
      },
      {
        test: /\.(jpg|jpeg|gif|png|svg|ico)?$/,
        use: {
          loader: "url-loader",
          options: {
            limit: 10000,
            fallback: "file-loader",
            name: "[name].[ext]?[hash]",
            outputPath: "img",
            publicPath: "../img",
          },
        },
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: "index.html",
      template: path.resolve(__dirname, "./public/index.html"),
    }),
    new DefinePlugin({
      "process.env": JSON.stringify(dotenv.config().parsed),
    }),
  ],
});