GraphQL\Type\Definition\LeafType::serialize PHP Метод

    public function serialize($value);

 /**
  * Complete a Scalar or Enum by serializing to a valid value, returning
  * null if serialization is not possible.
  *
  * @param LeafType $returnType
  * @param $result
  * @return mixed
  * @throws \Exception
  */
 private static function completeLeafValue(LeafType $returnType, &$result)
 {
     $serializedResult = $returnType->serialize($result);
     if ($serializedResult === null) {
         throw new InvariantViolation('Expected a value of type "' . Utils::printSafe($returnType) . '" but received: ' . Utils::printSafe($result));
     }
     return $serializedResult;
 }