Hey dan, a member of the team here. Id like to proudly say we were very free-form in development and informed each other what we're doing and pushed to our own forked repos and then merged changes periodically. I think there was an intuitive sense that letting everyone doing what they are best at doing and periodically regrouping gets the most done.
I code in react without jsx and webpack. I recommend hyperx for your code. Hopefully new modules can be built out of this one.