module GraphQL::Schema::Interface::DefinitionMethods

def to_graphql
  type_defn = GraphQL::InterfaceType.new
  type_defn.name = graphql_name
  type_defn.description = description
  type_defn.orphan_types = orphan_types
  type_defn.ast_node = ast_node
  fields.each do |field_name, field_inst|
    field_defn = field_inst.graphql_definition
    type_defn.fields[field_defn.name] = field_defn
  end
  type_defn.metadata[:type_class] = self
  if respond_to?(:resolve_type)
    type_defn.resolve_type = method(:resolve_type)
  end
  type_defn
end