GraphQL\Validator\Rules\OverlappingFieldsCanBeMerged::__invoke PHP Method

    public function __invoke(ValidationContext $context)
    {
        $this->comparedSet = new PairSet();
        return [NodeKind::SELECTION_SET => ['leave' => function (SelectionSetNode $selectionSet) use($context) {
            $fieldMap = $this->collectFieldNodesAndDefs($context, $context->getParentType(), $selectionSet);
            $conflicts = $this->findConflicts(false, $fieldMap, $context);
            foreach ($conflicts as $conflict) {
                $responseName = $conflict[0][0];
                $reason = $conflict[0][1];
                $fields1 = $conflict[1];
                $fields2 = $conflict[2];
                $context->reportError(new Error(self::fieldsConflictMessage($responseName, $reason), array_merge($fields1, $fields2)));
            }
        }]];
    }