Youshido\GraphQL\Type\TypeFactory::getScalarTypesNames PHP Метод

    public static function getScalarTypesNames()
    {
        return [TypeMap::TYPE_INT, TypeMap::TYPE_FLOAT, TypeMap::TYPE_STRING, TypeMap::TYPE_BOOLEAN, TypeMap::TYPE_ID, TypeMap::TYPE_DATETIME, TypeMap::TYPE_DATE, TypeMap::TYPE_TIMESTAMP, TypeMap::TYPE_DATETIMETZ];
    }

 public static function isScalarType($type)
 {
     if (is_object($type)) {
         return $type instanceof AbstractScalarType || $type instanceof AbstractEnumType;
     }
     return in_array(strtolower($type), TypeFactory::getScalarTypesNames());
 }