Jackalope\NodeType\NodeType::getSupertypes PHP Method

    public function getSupertypes()
    {
        if (null === $this->superTypes) {
            $this->superTypes = array();
            foreach ($this->getDeclaredSupertypes() as $superType) {
                $this->superTypes[] = $superType;
                $this->superTypes = array_merge($this->superTypes, $superType->getSupertypes());
            }
        }
        return $this->superTypes;
    }