According to <https://github.com/JetBrains/kotlin-...

# kotlin-native

[Jonas Bark]

According to https://github.com/JetBrains/kotlin-native/blob/master/OBJC_INTEROP.md -> Function types every callback requires returning a KotlinUnit instance, like this:

ApiExample().exampleRequest(machine: machine) { response, exception in
   return KotlinUnit()
}

When one wants to distribute a library to 3rd party devs requiring the dev to return a KotlinUnit on every callback has a bad smell attached to it.
Is there any plans to change this behaviour?

[olonho]

unfortunately, this is design issue common to Unit semantics in Kotlin, see https://stackoverflow.com/questions/37828790/why-do-i-have-to-return-unit-instance-when-implementing-in-java-a-kotlin-functio for similar problem in Java interop

[svyatoslav.scherbina]

See also the following discussion:
https://github.com/JetBrains/kotlin-native/issues/1271

Kotlin and Swift are different languages. It is the fundamental reason for cases like this, when idiomatic Kotlin API translated to not-so-idiomatic Swift API.

[Jonas Bark]

okay, thank you for the resources.