Not OP, but I personally could not use JS, and would outright refuse to use, in production. It's fraught with headaches that seem trivial but drastically change control flow, == and === being my favourite example. Linters help, but it feels like a band-aid solution.

I've had good fun with JS in my own time (where else can you get a GLES window up in 3 lines of code?), and I've written my fair share of helper application that notify me of certain album releases. But I would never ship something using it (and in fact I generally switch to Dart if I get serious enough about a web project, another band-aid solution). It could be preference, or it could be the years of embedded programming expecting timely results with minimum overhead (make no mistake, a modern web browser is a hell of an overhead).