neff-steindesign.de/themes/neff/webpack.config.js

module.exports = {
    entry: {
        bundle: ['./src/js/main.js'],
    },
    mode: 'production',
    output: {
        filename: '[name].js',
        path: __dirname + '/assets/js'
    },
    module: {
        rules: [
            {
                test: /\.m?js$/,
                exclude: /node_modules/,
                use: [
                    {
                        loader: 'babel-loader'
                    }
                ]
            }
        ]
    }
};