rollup.config.js

import fs from 'fs';
import babel from 'rollup-plugin-babel';
import resolve from 'rollup-plugin-node-resolve';
import cjs from 'rollup-plugin-commonjs';

const babelOptions = JSON.parse(fs.readFileSync('./.babelrc'));

export default {
  output: {
    format: 'umd',
    globals: {
      jquery: 'jQuery',
      'popper.js': 'Popper',
    },
  },
  external: ['jquery', 'popper.js'],
  plugins: [
    babel(Object.assign(babelOptions, {
      exclude: 'node_modules/**', // only transpile our source code
      externalHelpersWhitelist: [
        // Include only required helpers
        'defineProperties',
        'createClass',
        'inheritsLoose',
        'extends',
        'objectSpread',
        'defineProperty',
      ],
    }) ),
    resolve({
      mainFields: ['module', 'main'], // Default: ['module', 'main']
    }),
    cjs({
      include: ['node_modules/bootstrap/**', 'node_modules/jquery/**'],
      namedExports: {
        'node_modules/jquery/dist/jquery.js': 'jquery',
      },
    }),
  ],
};