rollup.config.js

import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import babel from 'rollup-plugin-babel';
import pkg from './package.json';

export default [
  // browser-friendly UMD build
  {
    input: 'src/serviceWorker.js',
    output: {
      name: 'serviceWorker',
      file: 'lib/serviceWorker.js',
      format: 'umd'
    },
    plugins: [
      resolve(), // so Rollup can find `ms`
      commonjs(), // so Rollup can convert `ms` to an ES module
      babel({
        exclude: ['node_modules/**']
      })
    ]
  },
  {
    input: 'src/webpackPlugin.js',
    external: ['ms'],
    output: [
      { file: pkg.main, format: 'cjs' },
      { file: pkg.module, format: 'es' }
    ],
    plugins: [
      babel({
        exclude: ['node_modules/**']
      })
    ]
  }
];