Is it possible to create compilation based source sets? I want to have some common

expect

function that has different implementation based on compilation type (debug vs release basically), how would I set that up?

I doubt it, but would be glad to be proven wrong here.

What I’m looking for is a setup like this:

// commonMain
expect fun foo(): String

// commonRelease
actual fun foo(): String = "release"

// commonDebug
actual fun foo(): String = "debug"

Even with BuildKonfig - there's no real way to do this. This is because common sources doesn't distinguish between release and debug sources