> the day when Facebook gives up on flow and adopts Typescript will be a glorious, glorious day.

I foresee FB to skip TypeScript and go straight with ReasonML[0], as 25%[1] of the messenger code base supposedly is already converted to Reason.

And I think that is even more glorious development then FB going with TypeScript. :)

[0]: An easier to approach (for programmers coming from mainstream languages; like JS/C++/Java/C#) syntax on top of the OCaml language, and some new tooling. The tools integrate specifically well with BuckleScript (by JaneStreet) which provides the OCaml compiler with a JAvaScript compile target.

[1]: https://news.ycombinator.com/item?id=13980062

https://facebook.github.io/reason

https://github.com/vramana/awesome-reasonml (some links to example code in the last section)