nikibah-test-package/webpack.config.js

Demo component

var path = require("path");
module.exports = {
	entry: "./src/index.js",
	mode: "production",
	output: {
		path: path.resolve(__dirname, "build"),
		filename: "index.js",
		libraryTarget: "commonjs2",
	},
	module: {
		rules: [
			{
				test: /\.js?$/,
				exclude: /(node_modules)/,
				use: "babel-loader",
			},
			{
				test: /\.css$/,
				use: ["style-loader", "css-loader"],
			},
		],
	},
	resolve: {
		alias: {
			react: path.resolve(__dirname, "./node_modules/react"),
			"react-dom": path.resolve(__dirname, "./node_modules/react-dom"),
		},
	},
	externals: {
		react: "commonjs react",
	},
};