code: def is_vertex_field_type(graphql_type):
      
      # This will need to change if we ever support complex embedded types or edge field types.
      underlying_type = strip_non_null_from_type(graphql_type)
      return isinstance(underlying_type, (GraphQLInterfaceType, GraphQLObjectType, GraphQLUnionType))
docs: Return True if the argument is a vertex field type, and False otherwise.