GraphQL\Validator\Rules\UniqueOperationNames::__invoke PHP Метод

    public function __invoke(ValidationContext $context)
    {
        $this->knownOperationNames = [];
        return [NodeKind::OPERATION_DEFINITION => function (OperationDefinitionNode $node) use($context) {
            $operationName = $node->name;
            if ($operationName) {
                if (!empty($this->knownOperationNames[$operationName->value])) {
                    $context->reportError(new Error(self::duplicateOperationNameMessage($operationName->value), [$this->knownOperationNames[$operationName->value], $operationName]));
                } else {
                    $this->knownOperationNames[$operationName->value] = $operationName;
                }
            }
            return Visitor::skipNode();
        }, NodeKind::FRAGMENT_DEFINITION => function () {
            return Visitor::skipNode();
        }];
    }