initial commit: scaffolding

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diff --git a/node_modules/date-fns/esm/intervalToDuration/index.js b/node_modules/date-fns/esm/intervalToDuration/index.js
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+import compareAsc from "../compareAsc/index.js";
+import add from "../add/index.js";
+import differenceInDays from "../differenceInDays/index.js";
+import differenceInHours from "../differenceInHours/index.js";
+import differenceInMinutes from "../differenceInMinutes/index.js";
+import differenceInMonths from "../differenceInMonths/index.js";
+import differenceInSeconds from "../differenceInSeconds/index.js";
+import differenceInYears from "../differenceInYears/index.js";
+import toDate from "../toDate/index.js";
+import requiredArgs from "../_lib/requiredArgs/index.js";
+/**
+ * @name intervalToDuration
+ * @category Common Helpers
+ * @summary Convert interval to duration
+ *
+ * @description
+ * Convert a interval object to a duration object.
+ *
+ * @param {Interval} interval - the interval to convert to duration
+ *
+ * @returns {Duration} The duration Object
+ * @throws {TypeError} Requires 2 arguments
+ * @throws {RangeError} `start` must not be Invalid Date
+ * @throws {RangeError} `end` must not be Invalid Date
+ *
+ * @example
+ * // Get the duration between January 15, 1929 and April 4, 1968.
+ * intervalToDuration({
+ *   start: new Date(1929, 0, 15, 12, 0, 0),
+ *   end: new Date(1968, 3, 4, 19, 5, 0)
+ * })
+ * // => { years: 39, months: 2, days: 20, hours: 7, minutes: 5, seconds: 0 }
+ */
+export default function intervalToDuration(interval) {
+  requiredArgs(1, arguments);
+  var start = toDate(interval.start);
+  var end = toDate(interval.end);
+  if (isNaN(start.getTime())) throw new RangeError('Start Date is invalid');
+  if (isNaN(end.getTime())) throw new RangeError('End Date is invalid');
+  var duration = {};
+  duration.years = Math.abs(differenceInYears(end, start));
+  var sign = compareAsc(end, start);
+  var remainingMonths = add(start, {
+    years: sign * duration.years
+  });
+  duration.months = Math.abs(differenceInMonths(end, remainingMonths));
+  var remainingDays = add(remainingMonths, {
+    months: sign * duration.months
+  });
+  duration.days = Math.abs(differenceInDays(end, remainingDays));
+  var remainingHours = add(remainingDays, {
+    days: sign * duration.days
+  });
+  duration.hours = Math.abs(differenceInHours(end, remainingHours));
+  var remainingMinutes = add(remainingHours, {
+    hours: sign * duration.hours
+  });
+  duration.minutes = Math.abs(differenceInMinutes(end, remainingMinutes));
+  var remainingSeconds = add(remainingMinutes, {
+    minutes: sign * duration.minutes
+  });
+  duration.seconds = Math.abs(differenceInSeconds(end, remainingSeconds));
+  return duration;
+}
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