We use Haxe for a legacy PHP app. Its our secret weapon, im amazed why more PHP devs dont use Haxe, as its basically a better version of what typescript is to javascript.

We get all the bells and whistles, and a familiar feel, most new devs are up and running in a week with Haxe.

Compile times are instant, and tooling is good (lsp/testing/etc). LLMs also know Hace quite well as its an old language.