export declare function useTimeRemaining({ endTime, countdown, }: {
    endTime: string;
    countdown?: boolean;
}): {
    expired: boolean;
    days?: undefined;
    hours?: undefined;
    minutes?: undefined;
    seconds?: undefined;
} | {
    days: number;
    hours: number;
    minutes: number;
    seconds: number;
    expired?: undefined;
};