/**
 * Returns the number of days until the given date from today.
 *
 * @example
 * daysUntil("2099-01-01") // > 27000
 *
 * @param date The date to calculate until.
 * @returns The number of days until the given date.
 */
export declare function daysUntil(date: Date | string | number | null): number;