Kode studio indicates that I am using Haxe 4.0.0-rc.1 , which I think is outdated, because I have some dependencies that uses haxe.macro.FunctionKind but I keep getting an error like this Type not found : FunctionKind

I suspect that I need to update the Haxe version which Kha supports, How can I do that without breaking Kha?

Kha does come with an up to date version of Haxe. But Kode Studio doesn't come with an up to date version of Kha currently because I didn't update Kode Studio in two years. Get a recent version of Kha from GitHub and set the Kha Path option in Kode Studio.