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node_modules/date-fns/differenceInCalendarISOWeekYears.mjs

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+import { getISOWeekYear } from "./getISOWeekYear.mjs";
+
+/**
+ * @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
+ *
+ * @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 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 function differenceInCalendarISOWeekYears(dateLeft, dateRight) {
+  return getISOWeekYear(dateLeft) - getISOWeekYear(dateRight);
+}
+
+// Fallback for modularized imports:
+export default differenceInCalendarISOWeekYears;