webpack.config.js

const path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
    mode: 'none',
    entry: {
        'stratum': './stratum.js',
        'stratum.min': './stratum.js'
    },
    output: {
        filename: '[name].js',
        path: path.resolve(__dirname, 'dist')
    },
    module: {
        rules: [
            {
                test: /\.m?js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            }
        ]
    },
    plugins: [
        new CleanWebpackPlugin(['dist']),
        new UglifyJsPlugin({
            include: /\.min\.js$/,
            uglifyOptions: {
                warnings: false,
                compress: true
            }
        })
    ]
};