export interface HolidayCalendar {
    isHoliday(value: unknown): boolean;
    holidaysBetween(start: unknown, end: unknown): unknown[];
}
export interface HolidaySpec {
    month?: number;
    day?: number;
    compute?: (year: number) => {
        month: number;
        day: number;
    };
    name?: string;
}
export declare function createHolidayCalendar(specs: HolidaySpec[]): HolidayCalendar;
export declare function nextHoliday(cal: HolidayCalendar, value: unknown): unknown | undefined;
export declare function previousHoliday(cal: HolidayCalendar, value: unknown): unknown | undefined;
export declare function holidaysBetween(cal: HolidayCalendar, start: unknown, end: unknown): unknown[];