protected function getAvailableNamespaces(): ?array
    {
        if (\is_null($this->namespaces)) {
            $this->namespaces = $this->getOriginalContent()->getNameSpaces(true);
        }

        return $this->namespaces;
    }
protected function getAvailableNamespaces(): ?array
    {
        if (\is_null($this->namespaces)) {
            $this->namespaces = $this->getOriginalContent()->getNameSpaces(true);
        }

        return $this->namespaces;
    }
protected function getAvailableNamespaces ( ) : ? array { if ( \ is_null ( $ this -> namespaces ) ) { $ this -> namespaces = $ this -> getOriginalContent ( ) -> getNameSpaces ( true ) ; } return $ this -> namespaces ; }
Get available namespaces, and cached it during runtime to avoid
overhead.

@return array|null
Get available namespaces and cached it during runtime to avoid overhead .