/**
 * Adds the specified number of seconds to a given date and returns a new Date object.
 *
 * @deprecated Use {@link shiftSeconds} instead.
 */
export declare function addSeconds(seconds: number, date?: Date): Date;
/**
 * Shifts the given date by a specified number of seconds and returns a new Date object.
 *
 * Can take both positive and negative values for seconds.
 *
 * @param {number} seconds - The number of seconds to add to the date.
 * @param {Date} [date=new Date()] - The date to add the seconds to. Defaults to the current date.
 * @returns {Date} - A new Date object with the given number of seconds added.
 */
export declare function shiftSeconds(seconds: number, date?: Date | string | number): Date;