So it's caused by a reference to `print` not being what they expected. The create-react-app project maintains a great list of "confusing browser globals" for e

So it's caused by a reference to `print` not being what they expected. The create-react-app project maintains a great list of "confusing browser globals" for exactly this situation! https://github.com/facebook/create-react-app/tree/master/packages/confusing-browser-globals https://github.com/facebook/create-react-app/tree/master/pac... You can use it along with ESLint to detect situations where a variable reference is technically valid (it will refer to the window property) but is probably not what you're intending. Some of them are really easy to trip over, like `error`, `name`, and `open`. All global properties on the window!