GraphQL\Validator\Rules\KnownArgumentNames::unknownDirectiveArgMessage PHP Метод

    public static function unknownDirectiveArgMessage($argName, $directiveName)
    {
        return "Unknown argument \"{$argName}\" on directive \"@{$directiveName}\".";
    }

 private function unknownDirectiveArg($argName, $directiveName, $line, $column)
 {
     return FormattedError::create(KnownArgumentNames::unknownDirectiveArgMessage($argName, $directiveName), [new SourceLocation($line, $column)]);
 }