[m0meni]

With flow, you just gradually add typings and fix the resulting type errors. It's way easier to slowly integrate types file by file rather than rewriting everything.

Moreover I think that at the time there were no statically typed languages that targeted web.

[camdenreslink]

Java has targeted the web since forever. Ditto for C#.

[m0meni]

By target web, I meant compile to js with good interop. I.e. no languages like elm, purescript, reason, ghcjs, kotlin, etc.

[zenhack]

Reason/ocaml-bucklescript's js interop is actually very good -- it's one of the nicest FFIs I've ever seen.