public function findUidsOfDemoLanguages(): array
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('sys_language');
        $queryBuilder->getRestrictions()->removeAll()->add(GeneralUtility::makeInstance(DeletedRestriction::class));
        $rows = $queryBuilder->select('uid')
            ->from('sys_language')
            ->where(
                $queryBuilder->expr()->eq(
                    'tx_styleguide_isdemorecord',
                    $queryBuilder->createNamedParameter(1, \PDO::PARAM_INT)
                )
            )
            ->execute()
            ->fetchAll();
        $result = [];
        if (is_array($rows)) {
            foreach ($rows as $row) {
                $result[] = $row['uid'];
            }
        }
        return $result;
    }