rollup.config.js

import babel from 'rollup-plugin-babel'
import pkg from './package.json'

export default [
  {
    input: 'src/Element.js',
    output: [
      // CJS & ESM bundle
      {file: pkg.main, format: 'cjs'},
      {file: pkg.module, format: 'es'},
    ],
    plugins: [babel()],
  },
]