Yes, it's production ready, but the quirks in tools are significant hindrance to productivity. I would estimate 1.2 ~ 1.5x longer to get it written in Swift.
Is tooling really that critical? Coming from JS, I can write whatever without any tooling at all. The need for heavy tooling in most other frontend dev is one of the reasons that I think that JS, despite all its issues at the moment, will come to rule interface development. The baseline in JS is that one can read, write, and understand it using only the human brain.