/**
 * @name differenceInCalendarYears
 * @category Year Helpers
 * @summary Get the number of calendar years between the given dates.
 *
 * @description
 * Get the number of calendar years between the given dates.
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 *
 * @param dateLeft - The later date
 * @param dateRight - The earlier date

 * @returns The number of calendar years
 *
 * @example
 * // How many calendar years are between 31 December 2013 and 11 February 2015?
 * const result = differenceInCalendarYears(
 *   new Date(2015, 1, 11),
 *   new Date(2013, 11, 31)
 * )
 * //=> 2
 */
export declare function differenceInCalendarYears<DateType extends Date>(
  dateLeft: DateType | number | string,
  dateRight: DateType | number | string,
): number;