webpack.config.js

const HtmlWebpackPlugin = require("html-webpack-plugin");
const path = require("path");

const APP_PATH = "./public";

const config = {
    mode: "development",
    entry: path.resolve(__dirname, APP_PATH),
    output: {
        path: path.resolve(__dirname, "build"),
        filename: "bundle.js",
        library: "default",
        libraryTarget: "umd"
    },

    resolve: { extensions: [".js", ".json"] },

    module: {
        rules: [
            { test: /\.(js)x?$/, loader: "babel-loader", exclude: /node_modules/ }
        ]
    },

    plugins: [
        new HtmlWebpackPlugin({
            inject: true,
            template: path.join(APP_PATH, "index.html")
        })
    ]
};

module.exports = () => config;