Hello. Is there best practics for returns platform Type from

expect

function? For example,

Drawable

for android and

UIImage

for ios?

You need some abstraction for that that wraps both of those types. like

Image

which itself maybe expect declaration, implemented on each platform in a way that exposes platform type

typealias?

Typealias may work, but you will have no common methods in this case, so it will be a type which may be references, but doesn't have any methods to use from common code. Imo real wrapper is more flexible, even of you don't have any common methods yet

Yes, this not for use inside common code, but for some type of declaration of intent. If we go deeper into this example, imagine what we want to declare some abstract API. Method that receive image ID and returns image resource. For android it will be

fun getImageForId(id:Int):Drawable

For iOS

fun getImageForId(id:NSString):UIImage

Of course I can declare those funcs separately, but it will be nice to declare abstract contract for

getImageForId

inside common code.

Both typealias or real wrapper approach will work in this case. You can even abstract image id param