rollup.config.js

import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import babel from '@rollup/plugin-babel';
import { terser } from 'rollup-plugin-terser';
import filesize from 'rollup-plugin-filesize';

const makeRollupConfig = (globalObjectName, inputFile, outputFile) => {
	const config = {
		input: inputFile,
		output: {
			file: outputFile,
			format: 'umd',
			name: globalObjectName,
			sourcemap: true,
		},
		plugins: [
			resolve(),
			commonjs(),
			babel({ babelHelpers: 'bundled' }),
		],
	};

	if (outputFile.includes('.min.')) {
		config.plugins.push(terser({ compress: { passes: 2 } }));
	}

	config.plugins.push(filesize({ showMinifiedSize: false }));

	return config;
};

export default [
	makeRollupConfig('Impulsion', 'src/impulsion.js', 'dist/impulsion.js'),
	makeRollupConfig('Impulsion', 'src/impulsion.js', 'dist/impulsion.min.js'),
];