webpack.config.js

var path = require('path');
module.exports = {
	mode: 'production',
	entry: './src/index.js',
	output: {
		path: path.resolve(__dirname, 'dist'),
		filename: 'index.js',
		libraryTarget: 'commonjs2'
	},
	module: {
		rules: [
			{
				test: /\.js$/,
				include: path.resolve(__dirname, 'src'),
				exclude: /(node_modules|bower_components|build)/,
				use: {
					loader: 'babel-loader',
					options: {
						presets: ['env']
					}
				}
			}
		]
	},
	externals: {
		react: 'commonjs react' // this line is just to use the React dependency of our parent-testing-project instead of using our own React.
	}
};