[virtualwhys]

> but that's not a concern when e.g. the backend is written in another language anyway.

well, for anyone who's been in this situation, it should be a concern, since it's incredibly easy to get out of sync between backend and frontend (e.g. model, validation, etc.).

Ideally we could all code in preferred-language; target all major platforms using a single/universal UI framework, and call it a day...but reality is messier than that, we're often forced to code apps in multiple languages, multiple UI frameworks (if targeting native iOS + Android, and browser/PWA), and hope it all comes together such that the house of cards stays standing through language/framework/platform upgrades.

[pka]

I agree, but what I meant is that if you're forced to use a language other than Haskell on the backend, than there's no advantage in choosing GHCJS over Purescript in terms of code sharing.