You say "just fb flow" as if it's the default choice. If I were looking at project and community momentum, tooling, and adoption then TypeScript would seem like

You say "just fb flow" as if it's the default choice. If I were looking at project and community momentum, tooling, and adoption then TypeScript would seem like the obvious choice. I'm curious why you think "why not just fb flow" for somebody who wants typed JS. It's certainly an option, but it hardly seems the go-to solution.