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diff --git a/library/fullcalendar/packages/rrule/main.esm.js b/library/fullcalendar/packages/rrule/main.esm.js
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+++ b/library/fullcalendar/packages/rrule/main.esm.js
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+/*!
+FullCalendar RRule Plugin v4.4.2
+Docs & License: https://fullcalendar.io/
+(c) 2019 Adam Shaw
+*/
+
+import { rrulestr, RRule } from 'rrule';
+import { createPlugin, refineProps, createDuration } from '@fullcalendar/core';
+
+/*! *****************************************************************************
+Copyright (c) Microsoft Corporation.
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+***************************************************************************** */
+
+var __assign = function() {
+    __assign = Object.assign || function __assign(t) {
+        for (var s, i = 1, n = arguments.length; i < n; i++) {
+            s = arguments[i];
+            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
+        }
+        return t;
+    };
+    return __assign.apply(this, arguments);
+};
+
+var EVENT_DEF_PROPS = {
+    rrule: null,
+    duration: createDuration
+};
+var recurring = {
+    parse: function (rawEvent, leftoverProps, dateEnv) {
+        if (rawEvent.rrule != null) {
+            var props = refineProps(rawEvent, EVENT_DEF_PROPS, {}, leftoverProps);
+            var parsed = parseRRule(props.rrule, dateEnv);
+            if (parsed) {
+                return {
+                    typeData: parsed.rrule,
+                    allDayGuess: parsed.allDayGuess,
+                    duration: props.duration
+                };
+            }
+        }
+        return null;
+    },
+    expand: function (rrule, framingRange) {
+        // we WANT an inclusive start and in exclusive end, but the js rrule lib will only do either BOTH
+        // inclusive or BOTH exclusive, which is stupid: https://github.com/jakubroztocil/rrule/issues/84
+        // Workaround: make inclusive, which will generate extra occurences, and then trim.
+        return rrule.between(framingRange.start, framingRange.end, true)
+            .filter(function (date) {
+            return date.valueOf() < framingRange.end.valueOf();
+        });
+    }
+};
+var main = createPlugin({
+    recurringTypes: [recurring]
+});
+function parseRRule(input, dateEnv) {
+    var allDayGuess = null;
+    var rrule;
+    if (typeof input === 'string') {
+        rrule = rrulestr(input);
+    }
+    else if (typeof input === 'object' && input) { // non-null object
+        var refined = __assign({}, input); // copy
+        if (typeof refined.dtstart === 'string') {
+            var dtstartMeta = dateEnv.createMarkerMeta(refined.dtstart);
+            if (dtstartMeta) {
+                refined.dtstart = dtstartMeta.marker;
+                allDayGuess = dtstartMeta.isTimeUnspecified;
+            }
+            else {
+                delete refined.dtstart;
+            }
+        }
+        if (typeof refined.until === 'string') {
+            refined.until = dateEnv.createMarker(refined.until);
+        }
+        if (refined.freq != null) {
+            refined.freq = convertConstant(refined.freq);
+        }
+        if (refined.wkst != null) {
+            refined.wkst = convertConstant(refined.wkst);
+        }
+        else {
+            refined.wkst = (dateEnv.weekDow - 1 + 7) % 7; // convert Sunday-first to Monday-first
+        }
+        if (refined.byweekday != null) {
+            refined.byweekday = convertConstants(refined.byweekday); // the plural version
+        }
+        rrule = new RRule(refined);
+    }
+    if (rrule) {
+        return { rrule: rrule, allDayGuess: allDayGuess };
+    }
+    return null;
+}
+function convertConstants(input) {
+    if (Array.isArray(input)) {
+        return input.map(convertConstant);
+    }
+    return convertConstant(input);
+}
+function convertConstant(input) {
+    if (typeof input === 'string') {
+        return RRule[input.toUpperCase()];
+    }
+    return input;
+}
+
+export default main;