RocketChat/Rocket.Chat

import { useSession, useTranslation } from '@rocket.chat/ui-contexts';

export const useUnreadMessages = (): string | undefined => {
    const t = useTranslation();
    const unreadMessages = useSession('unread') as number | '' | '999+' | '•';

    return (() => {
        // TODO: remove this when we have a better way to handle this
        if (typeof unreadMessages !== 'number') {
            return undefined;
        }

        return t('unread_messages_counter', { count: unreadMessages });
    })();
};