initial commit: scaffolding

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diff --git a/node_modules/date-fns/esm/differenceInCalendarISOWeeks/index.js b/node_modules/date-fns/esm/differenceInCalendarISOWeeks/index.js
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+import getTimezoneOffsetInMilliseconds from "../_lib/getTimezoneOffsetInMilliseconds/index.js";
+import startOfISOWeek from "../startOfISOWeek/index.js";
+import requiredArgs from "../_lib/requiredArgs/index.js";
+var MILLISECONDS_IN_WEEK = 604800000;
+
+/**
+ * @name differenceInCalendarISOWeeks
+ * @category ISO Week Helpers
+ * @summary Get the number of calendar ISO weeks between the given dates.
+ *
+ * @description
+ * Get the number of calendar ISO weeks 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 calendar ISO weeks
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // How many calendar ISO weeks are between 6 July 2014 and 21 July 2014?
+ * const result = differenceInCalendarISOWeeks(
+ *   new Date(2014, 6, 21),
+ *   new Date(2014, 6, 6)
+ * )
+ * //=> 3
+ */
+export default function differenceInCalendarISOWeeks(dirtyDateLeft, dirtyDateRight) {
+  requiredArgs(2, arguments);
+  var startOfISOWeekLeft = startOfISOWeek(dirtyDateLeft);
+  var startOfISOWeekRight = startOfISOWeek(dirtyDateRight);
+  var timestampLeft = startOfISOWeekLeft.getTime() - getTimezoneOffsetInMilliseconds(startOfISOWeekLeft);
+  var timestampRight = startOfISOWeekRight.getTime() - getTimezoneOffsetInMilliseconds(startOfISOWeekRight);
+
+  // Round the number of days to the nearest integer
+  // because the number of milliseconds in a week is not constant
+  // (e.g. it's different in the week of the daylight saving time clock shift)
+  return Math.round((timestampLeft - timestampRight) / MILLISECONDS_IN_WEEK);
+}
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