public function mkdir(string $path = ""): File {
		if (!empty($path)) {
			$dir = new File(Paths::appendPath($this->getUrl(), $path));
			$dir->mkdir();

			return $dir;
		} else {
			if (!$this->isDirectory() && !$this->isFile()) {
				$this->manager->createDir($this->getUrl());
			}

			return $this;
		}
	}