I should add that I don't want to learn another language... my time is already limited enough. My Haskell experience should make Purescript easy, and the way Purescript fits elegantly with JavaScript should mean that I can learn what I need to about JS libraries, and incorporate them, without any inefficiency.

Learning OCaml, however... too much. With Scala, I learned that a combo OO/FP language requires a lot of effort to master... it's not just a matter of knowing FP and knowing OO and then assuming you can mix them expertly. It's really an entirely new category of language.

I would be willing to consider another Haskell-like language in place of Purescript, and a framework other than React.