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node_modules/date-fns/eachWeekOfInterval.mjs

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+import { addWeeks } from "./addWeeks.mjs";
+import { startOfWeek } from "./startOfWeek.mjs";
+import { toDate } from "./toDate.mjs";
+
+/**
+ * The {@link eachWeekOfInterval} function options.
+ */
+
+/**
+ * @name eachWeekOfInterval
+ * @category Interval Helpers
+ * @summary Return the array of weeks within the specified time interval.
+ *
+ * @description
+ * Return the array of weeks within the specified time interval.
+ *
+ * @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 interval - The interval.
+ * @param options - An object with options.
+ *
+ * @returns The array with starts of weeks from the week of the interval start to the week of the interval end
+ *
+ * @example
+ * // Each week within interval 6 October 2014 - 23 November 2014:
+ * const result = eachWeekOfInterval({
+ *   start: new Date(2014, 9, 6),
+ *   end: new Date(2014, 10, 23)
+ * })
+ * //=> [
+ * //   Sun Oct 05 2014 00:00:00,
+ * //   Sun Oct 12 2014 00:00:00,
+ * //   Sun Oct 19 2014 00:00:00,
+ * //   Sun Oct 26 2014 00:00:00,
+ * //   Sun Nov 02 2014 00:00:00,
+ * //   Sun Nov 09 2014 00:00:00,
+ * //   Sun Nov 16 2014 00:00:00,
+ * //   Sun Nov 23 2014 00:00:00
+ * // ]
+ */
+export function eachWeekOfInterval(interval, options) {
+  const startDate = toDate(interval.start);
+  const endDate = toDate(interval.end);
+
+  let reversed = +startDate > +endDate;
+  const startDateWeek = reversed
+    ? startOfWeek(endDate, options)
+    : startOfWeek(startDate, options);
+  const endDateWeek = reversed
+    ? startOfWeek(startDate, options)
+    : startOfWeek(endDate, options);
+
+  // Some timezones switch DST at midnight, making start of day unreliable in these timezones, 3pm is a safe bet
+  startDateWeek.setHours(15);
+  endDateWeek.setHours(15);
+
+  const endTime = +endDateWeek.getTime();
+  let currentDate = startDateWeek;
+
+  let step = options?.step ?? 1;
+  if (!step) return [];
+  if (step < 0) {
+    step = -step;
+    reversed = !reversed;
+  }
+
+  const dates = [];
+
+  while (+currentDate <= endTime) {
+    currentDate.setHours(0);
+    dates.push(toDate(currentDate));
+    currentDate = addWeeks(currentDate, step);
+    currentDate.setHours(15);
+  }
+
+  return reversed ? dates.reverse() : dates;
+}
+
+// Fallback for modularized imports:
+export default eachWeekOfInterval;