public function output()
	{
		if ($this->html)
		{
			return $this->snappy->getOutputFromHtml($this->html, $this->options);
		}

		if ($this->file)
		{
			return $this->snappy->getOutput($this->file, $this->options);
		}

		throw new \InvalidArgumentException('PDF Generator requires a html or file in order to produce output.');
    }