import { EventEmitter } from 'events' dependency issue

When I linked against this component for a browser app, a global 'events' object was used in my bundle.js that I had not installed. I installed an events lib to see if that would fix the require(), but it did not. Is this an unresolved devDependency, or a moved package within React? 

I'm building with rollupjs rather than webpack, fyi.  