[watty]

Looks awesome and love the focus on plugins. I also like some of the choices made, Redux, React Router, Security, etc. but going with Flow??

Our company has standardized on Typescript, it has practically "won". Unfortunately for me, introducing Flow would get shot down.

[t1amat]

It’s a library so either they need to be convinced to provide definitions or the community needs to be convinced to build them. But at the point that they are built it’s no different than anything else in your stack.