Does anyone know how to solve this? I'm trying to use Firestore's IgnoreExtraProperties on KMP.

// Common
expect annotation class IgnoreExtraProperties()

// Android
actual typealias IgnoreExtraProperties = com.google.firebase.firestore.IgnoreExtraProperties

However, when I try to run it, I get a

This class does not have a constructor

. I also did this but no luck. Maybe it's because the actual annotation is just an interface?

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
public @interface IgnoreExtraProperties {
}

Anyway, any help would be greatly appreciated!

My educated guess is that you want to start by implementing the interface and then, because the implementing class will be polymorphic when you add the @Serializable annotation, you will need to deal with "registering" the implementation in the scope of the interface. That means using a format + module or one of the ...PolymorphicSerializer strategies. My preferred solution is to use the JsonContentPolymorphicSerializer. Hope that helps.