Extension::getResult

private function getResult(): ?string
{
	$file = new File($this->path . '/extension.php');
	$result = null;
	if ($file->isExists())
	{
		$result = include($file->getPath());
	}

	if (!empty($result) && is_array($result))
	{
		return Json::encode($result);
	}

	return null;
}