Any ideas how i can declare

expect

of the folowing JS class in common module so I could

typealias

it in JS module?

class ExternalAPI {
  val important: dynamic
}

I'm assuming that ExternalApi is a class you jave created and that dynamic is the Js dependency You can make a expect class NAME_HEREin common then use actual typealias NAME_HERE = dynamic. Then in common expect class ExternalApi { val important : NAME_HERE } I also think interfaces can be used in place of expect/ actual

That doesn't work. I get

Type alias expands to dynamic, which is not a class, an interface, or an object

having

expect class Dynamic

actual typealias Dynamic = dynamic

What is dynamic?

dynamic is KotlinJS keyword