How do I use polymorphic serializers with split so...

# serialization

[martmists]

How do I use polymorphic serializers with split sourcesets? I get

kotlinx.serialization.SerializationException: Serializer for subclass 'MaterialAppTheme' is not found in the polymorphic scope of 'AppTheme'.
Check if class with serial name 'MaterialAppTheme' exists and serializer is registered in a corresponding SerializersModule.
To be registered automatically, class 'MaterialAppTheme' has to be '@Serializable', and the base class 'AppTheme' has to be sealed and '@Serializable'.

where MaterialAppTheme is an expect class, with the @Serializable on the actual class declarations. I can't put the annotation on the expect class because it doesn't have any properties in its primary constructor.

[Richard]

Why do you want to serialize the app theme?

[Richard]

If you only need the information of MaterialAppTheme then you can create another serializable class that has the same parameters but not extends anything and write a function to convert those.

[martmists]

Different AppTheme classes have different behaviors to render elements differently.