Hi Alex,
First of all just wanted to say thank you for putting this repository together! I replicated your implementation for my own app (particularly around the way you do authentication and your Apollo setup) and I have come across a bug.
In IE11 the app will not work with the following error in production:
Object doesn't support property or method 'assign'
This would suggest to me that perhaps babel is not transpiling the above method? I encountered a similar issue with my application in production, my was related to a Symbol method (Symbol.for) that isn't supported in IE11 so not sure where along the line it might not be transpiling this?
Thought it would be worth mentioning here to see if you or anyone else had come across the issue as IE11 still has enough usage to be converned about issues like this.
Thanks