I'd be very curious to hear about the OPs specific experience with Flow. I've found the opposite to be true of Flow vs Typescript with the added benefit that Flow is easy to integrate into an existing codebase.
> with the added benefit that Flow is easy to integrate into an existing codebase.
I converted our Node codebase to Typescript and had no problems at all. I don't know much about Flow, but what is it that makes you think it's easy comparative to Typescript?
Both are pretty trivial to integrate, because you can essentially white-list the rules you want applied, but the documentation on how to properly do this is lacking for typescript in my opinion. There is also a lot of contradictory information on best approaches when using Typescript.
I converted our Node codebase to Typescript and had no problems at all. I don't know much about Flow, but what is it that makes you think it's easy comparative to Typescript?