Util::isExtranetUser

static function isExtranetUser(int $userId): bool
{
	if (Loader::includeModule('intranet'))
	{
		$userDb = BitrixIntranetUserTable::getList([
			'filter' => [
				'ID' => $userId,
			],
			'select' => [
				'USER_TYPE',
			]
		]);

		$user = $userDb->fetch();
		return $user['USER_TYPE'] === 'extranet';
	}

	return false;
}