webpack.config.js

const UglifyJSPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
	module: {
		rules: [
			{
				include: [path.resolve(__dirname, 'src')],
				loader: 'babel-loader',

				options: {
					plugins: ['syntax-dynamic-import'],

					presets: [
						[
							'@babel/preset-env',
							{
								modules: false
							}
						]
					]
				},

				test: /\.js$/
			}
		]
	},

	entry: {
		op_session: './src/op_session.js',
		rp_session: './src/rp_session.js',
	},

	output: {
		filename: '[name].min.js',
		libraryTarget: 'umd',
	},

	mode: 'production',

	optimization: {
		splitChunks: {
			cacheGroups: {
				vendors: {
					priority: -10,
					test: /[\\/]node_modules[\\/]/
				}
			},

			chunks: 'async',
			minChunks: 1,
			minSize: 30000,
			name: true
		},
		minimizer: [new UglifyJSPlugin({
			uglifyOptions: {
				output: {
				  comments: false,
				},
				compress: {
					drop_console: true,
				},
				keep_fnames: true,
			}
		})],
	}
};