rollup.config.node.js

import json from '@rollup/plugin-json';
import babel from '@rollup/plugin-babel';
import filesize from 'rollup-plugin-filesize';

export default {
  input: 'src/index.js',
  output: [
    {
      file: 'dist/jcognos.esm.js', // equivalent to --output
      format: 'es',
      name: 'jcognos',
      banner: `/**
     * Copyright (c) 2017, Reinier Battenberg
     * All rights reserved.
     *
     * Source code can be found at:
     * https://github.com/CognosExt/jcognos
     *
     * @license GPL 3.0
     */
    `,
    },
    {
      file: 'dist/jcognos.cjs.js', // equivalent to --output
      format: 'cjs',
      name: 'jcognos',
      banner: `/**
     * Copyright (c) 2017, Reinier Battenberg
     * All rights reserved.
     *
     * Source code can be found at:
     * https://github.com/CognosExt/jcognos
     *
     * @license GPL 3.0
     */
    `,
    },
  ],
  plugins: [
    json(),
    babel({
      exclude: 'node_modules/**',
      babelHelpers: 'bundled',
      //,
      //      plugins: ['@babel/plugin-external-helpers']
    }),
    filesize(),
  ],
};