/**
 * A function that adds and subtracts days from a `Date` object.
 *
 * @param date - The initial date value.
 * @param offset - The number of days to add and subtract from the date.
 * @returns - A new `Date` instance.
 *
 * @example
 * ```ts-no-run
 * addDays(new Date(2016, 0, 1), 5); // 2016-1-6
 * addDays(new Date(2016, 0, 1), -5); // 2015-12-26
 * ```
 */
export declare const addDays: (date: Date, offset: number) => Date;