My personal opinion is that it is a great introduction to functional programming in a front end environment, but the issues that have led to that drama are a huge turn off for production.

There are lots of great typed functional programming tools for the front end with varying levels of type features. All of them offer interoperation with JavaScript in various forms. I am sure there are more that I have not heard of.

Fable (F#)

GHCJS

js_of_ocaml

Purescript

Rescript (formerly ReasonML)

TypeScript