public function create(string $className, string $typeName): Type
    {
        $type = clone $this->types->getInput($className);
        $fieldsGetter = $type->config['fields'];

        $optionalFieldsGetter = function () use ($fieldsGetter): array {
            $optionalFields = [];
            foreach ($fieldsGetter() as $field) {
                if ($field['type'] instanceof NonNull) {
                    $field['type'] = $field['type']->getWrappedType();
                }

                unset($field['defaultValue']);

                $optionalFields[] = $field;
            }

            return $optionalFields;
        };
        $type->config['fields'] = $optionalFieldsGetter;
        $type->name = $typeName;

        return $type;
    }