initial commit: scaffolding

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diff --git a/node_modules/date-fns/intervalToDuration/index.js b/node_modules/date-fns/intervalToDuration/index.js
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+++ b/node_modules/date-fns/intervalToDuration/index.js
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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = intervalToDuration;
+var _index = _interopRequireDefault(require("../compareAsc/index.js"));
+var _index2 = _interopRequireDefault(require("../add/index.js"));
+var _index3 = _interopRequireDefault(require("../differenceInDays/index.js"));
+var _index4 = _interopRequireDefault(require("../differenceInHours/index.js"));
+var _index5 = _interopRequireDefault(require("../differenceInMinutes/index.js"));
+var _index6 = _interopRequireDefault(require("../differenceInMonths/index.js"));
+var _index7 = _interopRequireDefault(require("../differenceInSeconds/index.js"));
+var _index8 = _interopRequireDefault(require("../differenceInYears/index.js"));
+var _index9 = _interopRequireDefault(require("../toDate/index.js"));
+var _index10 = _interopRequireDefault(require("../_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 }
+ */
+function intervalToDuration(interval) {
+  (0, _index10.default)(1, arguments);
+  var start = (0, _index9.default)(interval.start);
+  var end = (0, _index9.default)(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((0, _index8.default)(end, start));
+  var sign = (0, _index.default)(end, start);
+  var remainingMonths = (0, _index2.default)(start, {
+    years: sign * duration.years
+  });
+  duration.months = Math.abs((0, _index6.default)(end, remainingMonths));
+  var remainingDays = (0, _index2.default)(remainingMonths, {
+    months: sign * duration.months
+  });
+  duration.days = Math.abs((0, _index3.default)(end, remainingDays));
+  var remainingHours = (0, _index2.default)(remainingDays, {
+    days: sign * duration.days
+  });
+  duration.hours = Math.abs((0, _index4.default)(end, remainingHours));
+  var remainingMinutes = (0, _index2.default)(remainingHours, {
+    hours: sign * duration.hours
+  });
+  duration.minutes = Math.abs((0, _index5.default)(end, remainingMinutes));
+  var remainingSeconds = (0, _index2.default)(remainingMinutes, {
+    minutes: sign * duration.minutes
+  });
+  duration.seconds = Math.abs((0, _index7.default)(end, remainingSeconds));
+  return duration;
+}
+module.exports = exports.default;
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