I guess this depends a bit on the project but pretty often yes. I currently maintain Typescript SPA with PHP backend and the split between languages is very fru

I guess this depends a bit on the project but pretty often yes. I currently maintain Typescript SPA with PHP backend and the split between languages is very frustrating, it induces a ton of pointless busywork. If the backend language was something stronger, than I'd be willing to accept that split to get those benefits, but having two different scripting languages seems quite pointless.