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import type { ContextOptions, DateArg } from "./types.js";
/**
* The {@link differenceInCalendarISOWeekYears} function options.
*/
export interface DifferenceInCalendarISOWeekYearsOptions
extends ContextOptions<Date> {}
/**
* @name differenceInCalendarISOWeekYears
* @category ISO Week-Numbering Year Helpers
* @summary Get the number of calendar ISO week-numbering years between the given dates.
*
* @description
* Get the number of calendar ISO week-numbering years between the given dates.
*
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
*
* @param laterDate - The later date
* @param earlierDate - The earlier date
* @param options - An object with options
*
* @returns The number of calendar ISO week-numbering years
*
* @example
* // How many calendar ISO week-numbering years are 1 January 2010 and 1 January 2012?
* const result = differenceInCalendarISOWeekYears(
* new Date(2012, 0, 1),
* new Date(2010, 0, 1)
* )
* //=> 2
*/
export declare function differenceInCalendarISOWeekYears(
laterDate: DateArg<Date> & {},
earlierDate: DateArg<Date> & {},
options?: DifferenceInCalendarISOWeekYearsOptions | undefined,
): number;