package.json

{
  "name": "hello-import",
  "version": "1.0.0",
  "scripts": {
    "build": "rollup -c"
  },
  "author": "Johannes J. Schmidt <[email protected]> (http://die-tf.de/)",
  "license": "Apache-2.0",
  "devDependencies": {
    "events": "^1.1.0",
    "pouchdb": "^5.2.0",
    "process": "^0.11.2",
    "rollup": "^0.25.0",
    "rollup-plugin-commonjs": "^2.2.0",
    "rollup-plugin-npm": "^1.3.0"
  }
}

rollup.config.js

import npm from 'rollup-plugin-npm'
import commonjs from 'rollup-plugin-commonjs'

export default {
  entry: 'src/modules/index.js',
  format: 'iife',
  moduleName: 'modules',
  plugins: [
    npm({
      browser: true
    }),
    commonjs()
  ],
  dest: 'lib/modules.js'
}

src-modules-index.js

exports.PouchDB = require('pouchdb')