Neos\ContentRepository\Domain\Model\NodeType::traverseSuperTypes PHP Method

    protected function traverseSuperTypes(NodeType $currentNodeType, $constraintNodeTypeName, $distance)
    {
        if ($currentNodeType->getName() === $constraintNodeTypeName) {
            return $distance;
        }
        $distance++;
        foreach ($currentNodeType->getDeclaredSuperTypes() as $superType) {
            $result = $this->traverseSuperTypes($superType, $constraintNodeTypeName, $distance);
            if ($result !== null) {
                return $result;
            }
        }
        return null;
    }