/**
 * A function which returns the last date of the month.
 *
 * @param date - The initial date.
 * @returns - The last date of the initial date month.
 *
 * @example
 * ```ts-no-run
 * lastDayOfMonth(new Date(2016, 0, 15)); // 2016-01-31
 * ```
 */
export declare const lastDayOfMonth: (date: Date) => Date;