inheritance issues

main.dart

abstract class IQuery {}

abstract class IDocument {}

abstract class IModel {
  IQuery buildQuery({
    IDocument from, // putting dynamic here doesn't fix the issue
    int Function(IDocument, IDocument) clientSort,
    // ...
  });
}

class Query<D extends IDocument> implements IQuery {}

abstract class DocumentBase<M extends ModelBase<DocumentBase<M>>>
    implements IDocument {}

abstract class ModelBase<D extends DocumentBase<ModelBase<D>>>
    implements IModel {
  Query<D> buildQuery({
    D from,
    int Function(D, D) clientSort,
  });
}

// Without defining it in the base model class:

abstract class DocumentBase2<M extends ModelBase2<DocumentBase2<M>>>
    implements IDocument {}

abstract class ModelBase2<D extends DocumentBase2<ModelBase2<D>>>
    implements IModel {}

class User extends DocumentBase2<UserModel> {}

class UserModel extends ModelBase2<User> {
  Query<User> buildQuery({
    User from,
    int Function(User, User) clientSort,
  }) => null;
}