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-import toDate from "../toDate/index.js";
-import differenceInCalendarISOWeekYears from "../differenceInCalendarISOWeekYears/index.js";
-import compareAsc from "../compareAsc/index.js";
-import subISOWeekYears from "../subISOWeekYears/index.js";
-import requiredArgs from "../_lib/requiredArgs/index.js";
-/**
- * @name differenceInISOWeekYears
- * @category ISO Week-Numbering Year Helpers
- * @summary Get the number of full ISO week-numbering years between the given dates.
- *
- * @description
- * Get the number of full ISO week-numbering years between the given dates.
- *
- * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
- *
- * @param {Date|Number} dateLeft - the later date
- * @param {Date|Number} dateRight - the earlier date
- * @returns {Number} the number of full ISO week-numbering years
- * @throws {TypeError} 2 arguments required
- *
- * @example
- * // How many full ISO week-numbering years are between 1 January 2010 and 1 January 2012?
- * const result = differenceInISOWeekYears(
- * new Date(2012, 0, 1),
- * new Date(2010, 0, 1)
- * )
- * //=> 1
- */
-export default function differenceInISOWeekYears(dirtyDateLeft, dirtyDateRight) {
- requiredArgs(2, arguments);
- var dateLeft = toDate(dirtyDateLeft);
- var dateRight = toDate(dirtyDateRight);
- var sign = compareAsc(dateLeft, dateRight);
- var difference = Math.abs(differenceInCalendarISOWeekYears(dateLeft, dateRight));
- dateLeft = subISOWeekYears(dateLeft, sign * difference);
-
- // Math.abs(diff in full ISO years - diff in calendar ISO years) === 1
- // if last calendar ISO year is not full
- // If so, result must be decreased by 1 in absolute value
- var isLastISOWeekYearNotFull = Number(compareAsc(dateLeft, dateRight) === -sign);
- var result = sign * (difference - isLastISOWeekYearNotFull);
- // Prevent negative zero
- return result === 0 ? 0 : result;
-} \ No newline at end of file
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