We actually built this because we write a lot of JavaScript at Facebook, and we need a tool like Flow. So yes, we worked on it full-time, with "funding": our de

We actually built this because we write a lot of JavaScript at Facebook, and we need a tool like Flow. So yes, we worked on it full-time, with "funding": our developers like to move fast, Flow helps them do that. (It's a different matter that we would have done this on our free time anyway, because it's so much fun!)