Hi all , Why doesn’t kotlin allow having a internal class as a constructor parameter which is marked as private val in a public class. For example

internal interface Mapper

class UseCase(private val mapper)

Why does compiler say ‘public’ function exposes its ‘internal’ parameter type when it is a

private val mapper

UseCase

's constructor is public, so it can be called outside your module. However,

Mapper

is internal, so it can't be used outside your module. The result is that it's not possible to call the constructor outside the module. You can make

UseCase

's constructor internal:

class UseCase internal constructor(private val mapper: Mapper)

Thanks @CLOVIS