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backend/node_modules/date-fns/LICENSE.md

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+MIT License
+
+Copyright (c) 2021 Sasha Koss and Lesha Koss https://kossnocorp.mit-license.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

backend/node_modules/date-fns/README.md

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+<p align="center">
+  <a href="https://date-fns.org/">
+    <img alt="date-fns" title="date-fns" src="https://raw.githubusercontent.com/date-fns/date-fns/master/docs/logotype.svg" width="300" />
+  </a>
+</p>
+
+<p align="center">
+  <b>date-fns</b> provides the most comprehensive, yet simple and consistent toolset
+  <br>
+  for manipulating <b>JavaScript dates</b> in <b>a browser</b> & <b>Node.js</b>.</b>
+</p>
+
+<div align="center">
+
+[📖&nbsp; Documentation](https://date-fns.org/docs/Getting-Started/)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[🧑‍💻&nbsp; JavaScript Jobs](https://jobs.date-fns.org/)
+
+</div>
+
+<hr>
+
+# It's like [Lodash](https://lodash.com) for dates
+
+- It has [**200+ functions** for all occasions](https://date-fns.org/docs/Getting-Started/).
+- **Modular**: Pick what you need. Works with webpack, Browserify, or Rollup and also supports tree-shaking.
+- **Native dates**: Uses existing native type. It doesn't extend core objects for safety's sake.
+- **Immutable & Pure**: Built using pure functions and always returns a new date instance.
+- **TypeScript & Flow**: Supports both Flow and TypeScript
+- **I18n**: Dozens of locales. Include only what you need.
+- [and many more benefits](https://date-fns.org/)
+
+```js
+import { compareAsc, format } from 'date-fns'
+
+format(new Date(2014, 1, 11), 'yyyy-MM-dd')
+//=> '2014-02-11'
+
+const dates = [
+  new Date(1995, 6, 2),
+  new Date(1987, 1, 11),
+  new Date(1989, 6, 10),
+]
+dates.sort(compareAsc)
+//=> [
+//   Wed Feb 11 1987 00:00:00,
+//   Mon Jul 10 1989 00:00:00,
+//   Sun Jul 02 1995 00:00:00
+// ]
+```
+
+The library is available as an [npm package](https://www.npmjs.com/package/date-fns).
+To install the package run:
+
+```bash
+npm install date-fns --save
+# or with yarn
+yarn add date-fns
+```
+
+## Docs
+
+[See date-fns.org](https://date-fns.org/) for more details, API,
+and other docs.
+
+<br />
+<!-- END OF README-JOB SECTION -->
+
+## License
+
+[MIT © Sasha Koss](https://kossnocorp.mit-license.org/)

backend/node_modules/date-fns/_lib/addLeadingZeros/index.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addLeadingZeros;
+function addLeadingZeros(number, targetLength) {
+  var sign = number < 0 ? '-' : '';
+  var output = Math.abs(number).toString();
+  while (output.length < targetLength) {
+    output = '0' + output;
+  }
+  return sign + output;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/assign/index.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = assign;
+function assign(target, object) {
+  if (target == null) {
+    throw new TypeError('assign requires that input parameter not be null or undefined');
+  }
+  for (var property in object) {
+    if (Object.prototype.hasOwnProperty.call(object, property)) {
+      ;
+      target[property] = object[property];
+    }
+  }
+  return target;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/cloneObject/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = cloneObject;
+var _index = _interopRequireDefault(require("../assign/index.js"));
+function cloneObject(object) {
+  return (0, _index.default)({}, object);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/defaultLocale/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _index = _interopRequireDefault(require("../../locale/en-US/index.js"));
+var _default = _index.default;
+exports.default = _default;
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/defaultOptions/index.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getDefaultOptions = getDefaultOptions;
+exports.setDefaultOptions = setDefaultOptions;
+var defaultOptions = {};
+function getDefaultOptions() {
+  return defaultOptions;
+}
+function setDefaultOptions(newOptions) {
+  defaultOptions = newOptions;
+}

backend/node_modules/date-fns/_lib/format/formatters/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _index = _interopRequireDefault(require("../../../_lib/getUTCDayOfYear/index.js"));
+var _index2 = _interopRequireDefault(require("../../../_lib/getUTCISOWeek/index.js"));
+var _index3 = _interopRequireDefault(require("../../../_lib/getUTCISOWeekYear/index.js"));
+var _index4 = _interopRequireDefault(require("../../../_lib/getUTCWeek/index.js"));
+var _index5 = _interopRequireDefault(require("../../../_lib/getUTCWeekYear/index.js"));
+var _index6 = _interopRequireDefault(require("../../addLeadingZeros/index.js"));
+var _index7 = _interopRequireDefault(require("../lightFormatters/index.js"));
+var dayPeriodEnum = {
+  am: 'am',
+  pm: 'pm',
+  midnight: 'midnight',
+  noon: 'noon',
+  morning: 'morning',
+  afternoon: 'afternoon',
+  evening: 'evening',
+  night: 'night'
+};
+/*
+ * |     | Unit                           |     | Unit                           |
+ * |-----|--------------------------------|-----|--------------------------------|
+ * |  a  | AM, PM                         |  A* | Milliseconds in day            |
+ * |  b  | AM, PM, noon, midnight         |  B  | Flexible day period            |
+ * |  c  | Stand-alone local day of week  |  C* | Localized hour w/ day period   |
+ * |  d  | Day of month                   |  D  | Day of year                    |
+ * |  e  | Local day of week              |  E  | Day of week                    |
+ * |  f  |                                |  F* | Day of week in month           |
+ * |  g* | Modified Julian day            |  G  | Era                            |
+ * |  h  | Hour [1-12]                    |  H  | Hour [0-23]                    |
+ * |  i! | ISO day of week                |  I! | ISO week of year               |
+ * |  j* | Localized hour w/ day period   |  J* | Localized hour w/o day period  |
+ * |  k  | Hour [1-24]                    |  K  | Hour [0-11]                    |
+ * |  l* | (deprecated)                   |  L  | Stand-alone month              |
+ * |  m  | Minute                         |  M  | Month                          |
+ * |  n  |                                |  N  |                                |
+ * |  o! | Ordinal number modifier        |  O  | Timezone (GMT)                 |
+ * |  p! | Long localized time            |  P! | Long localized date            |
+ * |  q  | Stand-alone quarter            |  Q  | Quarter                        |
+ * |  r* | Related Gregorian year         |  R! | ISO week-numbering year        |
+ * |  s  | Second                         |  S  | Fraction of second             |
+ * |  t! | Seconds timestamp              |  T! | Milliseconds timestamp         |
+ * |  u  | Extended year                  |  U* | Cyclic year                    |
+ * |  v* | Timezone (generic non-locat.)  |  V* | Timezone (location)            |
+ * |  w  | Local week of year             |  W* | Week of month                  |
+ * |  x  | Timezone (ISO-8601 w/o Z)      |  X  | Timezone (ISO-8601)            |
+ * |  y  | Year (abs)                     |  Y  | Local week-numbering year      |
+ * |  z  | Timezone (specific non-locat.) |  Z* | Timezone (aliases)             |
+ *
+ * Letters marked by * are not implemented but reserved by Unicode standard.
+ *
+ * Letters marked by ! are non-standard, but implemented by date-fns:
+ * - `o` modifies the previous token to turn it into an ordinal (see `format` docs)
+ * - `i` is ISO day of week. For `i` and `ii` is returns numeric ISO week days,
+ *   i.e. 7 for Sunday, 1 for Monday, etc.
+ * - `I` is ISO week of year, as opposed to `w` which is local week of year.
+ * - `R` is ISO week-numbering year, as opposed to `Y` which is local week-numbering year.
+ *   `R` is supposed to be used in conjunction with `I` and `i`
+ *   for universal ISO week-numbering date, whereas
+ *   `Y` is supposed to be used in conjunction with `w` and `e`
+ *   for week-numbering date specific to the locale.
+ * - `P` is long localized date format
+ * - `p` is long localized time format
+ */
+
+var formatters = {
+  // Era
+  G: function G(date, token, localize) {
+    var era = date.getUTCFullYear() > 0 ? 1 : 0;
+    switch (token) {
+      // AD, BC
+      case 'G':
+      case 'GG':
+      case 'GGG':
+        return localize.era(era, {
+          width: 'abbreviated'
+        });
+      // A, B
+      case 'GGGGG':
+        return localize.era(era, {
+          width: 'narrow'
+        });
+      // Anno Domini, Before Christ
+      case 'GGGG':
+      default:
+        return localize.era(era, {
+          width: 'wide'
+        });
+    }
+  },
+  // Year
+  y: function y(date, token, localize) {
+    // Ordinal number
+    if (token === 'yo') {
+      var signedYear = date.getUTCFullYear();
+      // Returns 1 for 1 BC (which is year 0 in JavaScript)
+      var year = signedYear > 0 ? signedYear : 1 - signedYear;
+      return localize.ordinalNumber(year, {
+        unit: 'year'
+      });
+    }
+    return _index7.default.y(date, token);
+  },
+  // Local week-numbering year
+  Y: function Y(date, token, localize, options) {
+    var signedWeekYear = (0, _index5.default)(date, options);
+    // Returns 1 for 1 BC (which is year 0 in JavaScript)
+    var weekYear = signedWeekYear > 0 ? signedWeekYear : 1 - signedWeekYear;
+
+    // Two digit year
+    if (token === 'YY') {
+      var twoDigitYear = weekYear % 100;
+      return (0, _index6.default)(twoDigitYear, 2);
+    }
+
+    // Ordinal number
+    if (token === 'Yo') {
+      return localize.ordinalNumber(weekYear, {
+        unit: 'year'
+      });
+    }
+
+    // Padding
+    return (0, _index6.default)(weekYear, token.length);
+  },
+  // ISO week-numbering year
+  R: function R(date, token) {
+    var isoWeekYear = (0, _index3.default)(date);
+
+    // Padding
+    return (0, _index6.default)(isoWeekYear, token.length);
+  },
+  // Extended year. This is a single number designating the year of this calendar system.
+  // The main difference between `y` and `u` localizers are B.C. years:
+  // | Year | `y` | `u` |
+  // |------|-----|-----|
+  // | AC 1 |   1 |   1 |
+  // | BC 1 |   1 |   0 |
+  // | BC 2 |   2 |  -1 |
+  // Also `yy` always returns the last two digits of a year,
+  // while `uu` pads single digit years to 2 characters and returns other years unchanged.
+  u: function u(date, token) {
+    var year = date.getUTCFullYear();
+    return (0, _index6.default)(year, token.length);
+  },
+  // Quarter
+  Q: function Q(date, token, localize) {
+    var quarter = Math.ceil((date.getUTCMonth() + 1) / 3);
+    switch (token) {
+      // 1, 2, 3, 4
+      case 'Q':
+        return String(quarter);
+      // 01, 02, 03, 04
+      case 'QQ':
+        return (0, _index6.default)(quarter, 2);
+      // 1st, 2nd, 3rd, 4th
+      case 'Qo':
+        return localize.ordinalNumber(quarter, {
+          unit: 'quarter'
+        });
+      // Q1, Q2, Q3, Q4
+      case 'QQQ':
+        return localize.quarter(quarter, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      // 1, 2, 3, 4 (narrow quarter; could be not numerical)
+      case 'QQQQQ':
+        return localize.quarter(quarter, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      // 1st quarter, 2nd quarter, ...
+      case 'QQQQ':
+      default:
+        return localize.quarter(quarter, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // Stand-alone quarter
+  q: function q(date, token, localize) {
+    var quarter = Math.ceil((date.getUTCMonth() + 1) / 3);
+    switch (token) {
+      // 1, 2, 3, 4
+      case 'q':
+        return String(quarter);
+      // 01, 02, 03, 04
+      case 'qq':
+        return (0, _index6.default)(quarter, 2);
+      // 1st, 2nd, 3rd, 4th
+      case 'qo':
+        return localize.ordinalNumber(quarter, {
+          unit: 'quarter'
+        });
+      // Q1, Q2, Q3, Q4
+      case 'qqq':
+        return localize.quarter(quarter, {
+          width: 'abbreviated',
+          context: 'standalone'
+        });
+      // 1, 2, 3, 4 (narrow quarter; could be not numerical)
+      case 'qqqqq':
+        return localize.quarter(quarter, {
+          width: 'narrow',
+          context: 'standalone'
+        });
+      // 1st quarter, 2nd quarter, ...
+      case 'qqqq':
+      default:
+        return localize.quarter(quarter, {
+          width: 'wide',
+          context: 'standalone'
+        });
+    }
+  },
+  // Month
+  M: function M(date, token, localize) {
+    var month = date.getUTCMonth();
+    switch (token) {
+      case 'M':
+      case 'MM':
+        return _index7.default.M(date, token);
+      // 1st, 2nd, ..., 12th
+      case 'Mo':
+        return localize.ordinalNumber(month + 1, {
+          unit: 'month'
+        });
+      // Jan, Feb, ..., Dec
+      case 'MMM':
+        return localize.month(month, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      // J, F, ..., D
+      case 'MMMMM':
+        return localize.month(month, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      // January, February, ..., December
+      case 'MMMM':
+      default:
+        return localize.month(month, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // Stand-alone month
+  L: function L(date, token, localize) {
+    var month = date.getUTCMonth();
+    switch (token) {
+      // 1, 2, ..., 12
+      case 'L':
+        return String(month + 1);
+      // 01, 02, ..., 12
+      case 'LL':
+        return (0, _index6.default)(month + 1, 2);
+      // 1st, 2nd, ..., 12th
+      case 'Lo':
+        return localize.ordinalNumber(month + 1, {
+          unit: 'month'
+        });
+      // Jan, Feb, ..., Dec
+      case 'LLL':
+        return localize.month(month, {
+          width: 'abbreviated',
+          context: 'standalone'
+        });
+      // J, F, ..., D
+      case 'LLLLL':
+        return localize.month(month, {
+          width: 'narrow',
+          context: 'standalone'
+        });
+      // January, February, ..., December
+      case 'LLLL':
+      default:
+        return localize.month(month, {
+          width: 'wide',
+          context: 'standalone'
+        });
+    }
+  },
+  // Local week of year
+  w: function w(date, token, localize, options) {
+    var week = (0, _index4.default)(date, options);
+    if (token === 'wo') {
+      return localize.ordinalNumber(week, {
+        unit: 'week'
+      });
+    }
+    return (0, _index6.default)(week, token.length);
+  },
+  // ISO week of year
+  I: function I(date, token, localize) {
+    var isoWeek = (0, _index2.default)(date);
+    if (token === 'Io') {
+      return localize.ordinalNumber(isoWeek, {
+        unit: 'week'
+      });
+    }
+    return (0, _index6.default)(isoWeek, token.length);
+  },
+  // Day of the month
+  d: function d(date, token, localize) {
+    if (token === 'do') {
+      return localize.ordinalNumber(date.getUTCDate(), {
+        unit: 'date'
+      });
+    }
+    return _index7.default.d(date, token);
+  },
+  // Day of year
+  D: function D(date, token, localize) {
+    var dayOfYear = (0, _index.default)(date);
+    if (token === 'Do') {
+      return localize.ordinalNumber(dayOfYear, {
+        unit: 'dayOfYear'
+      });
+    }
+    return (0, _index6.default)(dayOfYear, token.length);
+  },
+  // Day of week
+  E: function E(date, token, localize) {
+    var dayOfWeek = date.getUTCDay();
+    switch (token) {
+      // Tue
+      case 'E':
+      case 'EE':
+      case 'EEE':
+        return localize.day(dayOfWeek, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      // T
+      case 'EEEEE':
+        return localize.day(dayOfWeek, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      // Tu
+      case 'EEEEEE':
+        return localize.day(dayOfWeek, {
+          width: 'short',
+          context: 'formatting'
+        });
+      // Tuesday
+      case 'EEEE':
+      default:
+        return localize.day(dayOfWeek, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // Local day of week
+  e: function e(date, token, localize, options) {
+    var dayOfWeek = date.getUTCDay();
+    var localDayOfWeek = (dayOfWeek - options.weekStartsOn + 8) % 7 || 7;
+    switch (token) {
+      // Numerical value (Nth day of week with current locale or weekStartsOn)
+      case 'e':
+        return String(localDayOfWeek);
+      // Padded numerical value
+      case 'ee':
+        return (0, _index6.default)(localDayOfWeek, 2);
+      // 1st, 2nd, ..., 7th
+      case 'eo':
+        return localize.ordinalNumber(localDayOfWeek, {
+          unit: 'day'
+        });
+      case 'eee':
+        return localize.day(dayOfWeek, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      // T
+      case 'eeeee':
+        return localize.day(dayOfWeek, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      // Tu
+      case 'eeeeee':
+        return localize.day(dayOfWeek, {
+          width: 'short',
+          context: 'formatting'
+        });
+      // Tuesday
+      case 'eeee':
+      default:
+        return localize.day(dayOfWeek, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // Stand-alone local day of week
+  c: function c(date, token, localize, options) {
+    var dayOfWeek = date.getUTCDay();
+    var localDayOfWeek = (dayOfWeek - options.weekStartsOn + 8) % 7 || 7;
+    switch (token) {
+      // Numerical value (same as in `e`)
+      case 'c':
+        return String(localDayOfWeek);
+      // Padded numerical value
+      case 'cc':
+        return (0, _index6.default)(localDayOfWeek, token.length);
+      // 1st, 2nd, ..., 7th
+      case 'co':
+        return localize.ordinalNumber(localDayOfWeek, {
+          unit: 'day'
+        });
+      case 'ccc':
+        return localize.day(dayOfWeek, {
+          width: 'abbreviated',
+          context: 'standalone'
+        });
+      // T
+      case 'ccccc':
+        return localize.day(dayOfWeek, {
+          width: 'narrow',
+          context: 'standalone'
+        });
+      // Tu
+      case 'cccccc':
+        return localize.day(dayOfWeek, {
+          width: 'short',
+          context: 'standalone'
+        });
+      // Tuesday
+      case 'cccc':
+      default:
+        return localize.day(dayOfWeek, {
+          width: 'wide',
+          context: 'standalone'
+        });
+    }
+  },
+  // ISO day of week
+  i: function i(date, token, localize) {
+    var dayOfWeek = date.getUTCDay();
+    var isoDayOfWeek = dayOfWeek === 0 ? 7 : dayOfWeek;
+    switch (token) {
+      // 2
+      case 'i':
+        return String(isoDayOfWeek);
+      // 02
+      case 'ii':
+        return (0, _index6.default)(isoDayOfWeek, token.length);
+      // 2nd
+      case 'io':
+        return localize.ordinalNumber(isoDayOfWeek, {
+          unit: 'day'
+        });
+      // Tue
+      case 'iii':
+        return localize.day(dayOfWeek, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      // T
+      case 'iiiii':
+        return localize.day(dayOfWeek, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      // Tu
+      case 'iiiiii':
+        return localize.day(dayOfWeek, {
+          width: 'short',
+          context: 'formatting'
+        });
+      // Tuesday
+      case 'iiii':
+      default:
+        return localize.day(dayOfWeek, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // AM or PM
+  a: function a(date, token, localize) {
+    var hours = date.getUTCHours();
+    var dayPeriodEnumValue = hours / 12 >= 1 ? 'pm' : 'am';
+    switch (token) {
+      case 'a':
+      case 'aa':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      case 'aaa':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'abbreviated',
+          context: 'formatting'
+        }).toLowerCase();
+      case 'aaaaa':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      case 'aaaa':
+      default:
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // AM, PM, midnight, noon
+  b: function b(date, token, localize) {
+    var hours = date.getUTCHours();
+    var dayPeriodEnumValue;
+    if (hours === 12) {
+      dayPeriodEnumValue = dayPeriodEnum.noon;
+    } else if (hours === 0) {
+      dayPeriodEnumValue = dayPeriodEnum.midnight;
+    } else {
+      dayPeriodEnumValue = hours / 12 >= 1 ? 'pm' : 'am';
+    }
+    switch (token) {
+      case 'b':
+      case 'bb':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      case 'bbb':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'abbreviated',
+          context: 'formatting'
+        }).toLowerCase();
+      case 'bbbbb':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      case 'bbbb':
+      default:
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // in the morning, in the afternoon, in the evening, at night
+  B: function B(date, token, localize) {
+    var hours = date.getUTCHours();
+    var dayPeriodEnumValue;
+    if (hours >= 17) {
+      dayPeriodEnumValue = dayPeriodEnum.evening;
+    } else if (hours >= 12) {
+      dayPeriodEnumValue = dayPeriodEnum.afternoon;
+    } else if (hours >= 4) {
+      dayPeriodEnumValue = dayPeriodEnum.morning;
+    } else {
+      dayPeriodEnumValue = dayPeriodEnum.night;
+    }
+    switch (token) {
+      case 'B':
+      case 'BB':
+      case 'BBB':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'abbreviated',
+          context: 'formatting'
+        });
+      case 'BBBBB':
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'narrow',
+          context: 'formatting'
+        });
+      case 'BBBB':
+      default:
+        return localize.dayPeriod(dayPeriodEnumValue, {
+          width: 'wide',
+          context: 'formatting'
+        });
+    }
+  },
+  // Hour [1-12]
+  h: function h(date, token, localize) {
+    if (token === 'ho') {
+      var hours = date.getUTCHours() % 12;
+      if (hours === 0) hours = 12;
+      return localize.ordinalNumber(hours, {
+        unit: 'hour'
+      });
+    }
+    return _index7.default.h(date, token);
+  },
+  // Hour [0-23]
+  H: function H(date, token, localize) {
+    if (token === 'Ho') {
+      return localize.ordinalNumber(date.getUTCHours(), {
+        unit: 'hour'
+      });
+    }
+    return _index7.default.H(date, token);
+  },
+  // Hour [0-11]
+  K: function K(date, token, localize) {
+    var hours = date.getUTCHours() % 12;
+    if (token === 'Ko') {
+      return localize.ordinalNumber(hours, {
+        unit: 'hour'
+      });
+    }
+    return (0, _index6.default)(hours, token.length);
+  },
+  // Hour [1-24]
+  k: function k(date, token, localize) {
+    var hours = date.getUTCHours();
+    if (hours === 0) hours = 24;
+    if (token === 'ko') {
+      return localize.ordinalNumber(hours, {
+        unit: 'hour'
+      });
+    }
+    return (0, _index6.default)(hours, token.length);
+  },
+  // Minute
+  m: function m(date, token, localize) {
+    if (token === 'mo') {
+      return localize.ordinalNumber(date.getUTCMinutes(), {
+        unit: 'minute'
+      });
+    }
+    return _index7.default.m(date, token);
+  },
+  // Second
+  s: function s(date, token, localize) {
+    if (token === 'so') {
+      return localize.ordinalNumber(date.getUTCSeconds(), {
+        unit: 'second'
+      });
+    }
+    return _index7.default.s(date, token);
+  },
+  // Fraction of second
+  S: function S(date, token) {
+    return _index7.default.S(date, token);
+  },
+  // Timezone (ISO-8601. If offset is 0, output is always `'Z'`)
+  X: function X(date, token, _localize, options) {
+    var originalDate = options._originalDate || date;
+    var timezoneOffset = originalDate.getTimezoneOffset();
+    if (timezoneOffset === 0) {
+      return 'Z';
+    }
+    switch (token) {
+      // Hours and optional minutes
+      case 'X':
+        return formatTimezoneWithOptionalMinutes(timezoneOffset);
+
+      // Hours, minutes and optional seconds without `:` delimiter
+      // Note: neither ISO-8601 nor JavaScript supports seconds in timezone offsets
+      // so this token always has the same output as `XX`
+      case 'XXXX':
+      case 'XX':
+        // Hours and minutes without `:` delimiter
+        return formatTimezone(timezoneOffset);
+
+      // Hours, minutes and optional seconds with `:` delimiter
+      // Note: neither ISO-8601 nor JavaScript supports seconds in timezone offsets
+      // so this token always has the same output as `XXX`
+      case 'XXXXX':
+      case 'XXX': // Hours and minutes with `:` delimiter
+      default:
+        return formatTimezone(timezoneOffset, ':');
+    }
+  },
+  // Timezone (ISO-8601. If offset is 0, output is `'+00:00'` or equivalent)
+  x: function x(date, token, _localize, options) {
+    var originalDate = options._originalDate || date;
+    var timezoneOffset = originalDate.getTimezoneOffset();
+    switch (token) {
+      // Hours and optional minutes
+      case 'x':
+        return formatTimezoneWithOptionalMinutes(timezoneOffset);
+
+      // Hours, minutes and optional seconds without `:` delimiter
+      // Note: neither ISO-8601 nor JavaScript supports seconds in timezone offsets
+      // so this token always has the same output as `xx`
+      case 'xxxx':
+      case 'xx':
+        // Hours and minutes without `:` delimiter
+        return formatTimezone(timezoneOffset);
+
+      // Hours, minutes and optional seconds with `:` delimiter
+      // Note: neither ISO-8601 nor JavaScript supports seconds in timezone offsets
+      // so this token always has the same output as `xxx`
+      case 'xxxxx':
+      case 'xxx': // Hours and minutes with `:` delimiter
+      default:
+        return formatTimezone(timezoneOffset, ':');
+    }
+  },
+  // Timezone (GMT)
+  O: function O(date, token, _localize, options) {
+    var originalDate = options._originalDate || date;
+    var timezoneOffset = originalDate.getTimezoneOffset();
+    switch (token) {
+      // Short
+      case 'O':
+      case 'OO':
+      case 'OOO':
+        return 'GMT' + formatTimezoneShort(timezoneOffset, ':');
+      // Long
+      case 'OOOO':
+      default:
+        return 'GMT' + formatTimezone(timezoneOffset, ':');
+    }
+  },
+  // Timezone (specific non-location)
+  z: function z(date, token, _localize, options) {
+    var originalDate = options._originalDate || date;
+    var timezoneOffset = originalDate.getTimezoneOffset();
+    switch (token) {
+      // Short
+      case 'z':
+      case 'zz':
+      case 'zzz':
+        return 'GMT' + formatTimezoneShort(timezoneOffset, ':');
+      // Long
+      case 'zzzz':
+      default:
+        return 'GMT' + formatTimezone(timezoneOffset, ':');
+    }
+  },
+  // Seconds timestamp
+  t: function t(date, token, _localize, options) {
+    var originalDate = options._originalDate || date;
+    var timestamp = Math.floor(originalDate.getTime() / 1000);
+    return (0, _index6.default)(timestamp, token.length);
+  },
+  // Milliseconds timestamp
+  T: function T(date, token, _localize, options) {
+    var originalDate = options._originalDate || date;
+    var timestamp = originalDate.getTime();
+    return (0, _index6.default)(timestamp, token.length);
+  }
+};
+function formatTimezoneShort(offset, dirtyDelimiter) {
+  var sign = offset > 0 ? '-' : '+';
+  var absOffset = Math.abs(offset);
+  var hours = Math.floor(absOffset / 60);
+  var minutes = absOffset % 60;
+  if (minutes === 0) {
+    return sign + String(hours);
+  }
+  var delimiter = dirtyDelimiter || '';
+  return sign + String(hours) + delimiter + (0, _index6.default)(minutes, 2);
+}
+function formatTimezoneWithOptionalMinutes(offset, dirtyDelimiter) {
+  if (offset % 60 === 0) {
+    var sign = offset > 0 ? '-' : '+';
+    return sign + (0, _index6.default)(Math.abs(offset) / 60, 2);
+  }
+  return formatTimezone(offset, dirtyDelimiter);
+}
+function formatTimezone(offset, dirtyDelimiter) {
+  var delimiter = dirtyDelimiter || '';
+  var sign = offset > 0 ? '-' : '+';
+  var absOffset = Math.abs(offset);
+  var hours = (0, _index6.default)(Math.floor(absOffset / 60), 2);
+  var minutes = (0, _index6.default)(absOffset % 60, 2);
+  return sign + hours + delimiter + minutes;
+}
+var _default = formatters;
+exports.default = _default;
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/format/lightFormatters/index.js

@@ -0,0 +1,90 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _index = _interopRequireDefault(require("../../addLeadingZeros/index.js"));
+/*
+ * |     | Unit                           |     | Unit                           |
+ * |-----|--------------------------------|-----|--------------------------------|
+ * |  a  | AM, PM                         |  A* |                                |
+ * |  d  | Day of month                   |  D  |                                |
+ * |  h  | Hour [1-12]                    |  H  | Hour [0-23]                    |
+ * |  m  | Minute                         |  M  | Month                          |
+ * |  s  | Second                         |  S  | Fraction of second             |
+ * |  y  | Year (abs)                     |  Y  |                                |
+ *
+ * Letters marked by * are not implemented but reserved by Unicode standard.
+ */
+
+var formatters = {
+  // Year
+  y: function y(date, token) {
+    // From http://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html#Date_Format_tokens
+    // | Year     |     y | yy |   yyy |  yyyy | yyyyy |
+    // |----------|-------|----|-------|-------|-------|
+    // | AD 1     |     1 | 01 |   001 |  0001 | 00001 |
+    // | AD 12    |    12 | 12 |   012 |  0012 | 00012 |
+    // | AD 123   |   123 | 23 |   123 |  0123 | 00123 |
+    // | AD 1234  |  1234 | 34 |  1234 |  1234 | 01234 |
+    // | AD 12345 | 12345 | 45 | 12345 | 12345 | 12345 |
+
+    var signedYear = date.getUTCFullYear();
+    // Returns 1 for 1 BC (which is year 0 in JavaScript)
+    var year = signedYear > 0 ? signedYear : 1 - signedYear;
+    return (0, _index.default)(token === 'yy' ? year % 100 : year, token.length);
+  },
+  // Month
+  M: function M(date, token) {
+    var month = date.getUTCMonth();
+    return token === 'M' ? String(month + 1) : (0, _index.default)(month + 1, 2);
+  },
+  // Day of the month
+  d: function d(date, token) {
+    return (0, _index.default)(date.getUTCDate(), token.length);
+  },
+  // AM or PM
+  a: function a(date, token) {
+    var dayPeriodEnumValue = date.getUTCHours() / 12 >= 1 ? 'pm' : 'am';
+    switch (token) {
+      case 'a':
+      case 'aa':
+        return dayPeriodEnumValue.toUpperCase();
+      case 'aaa':
+        return dayPeriodEnumValue;
+      case 'aaaaa':
+        return dayPeriodEnumValue[0];
+      case 'aaaa':
+      default:
+        return dayPeriodEnumValue === 'am' ? 'a.m.' : 'p.m.';
+    }
+  },
+  // Hour [1-12]
+  h: function h(date, token) {
+    return (0, _index.default)(date.getUTCHours() % 12 || 12, token.length);
+  },
+  // Hour [0-23]
+  H: function H(date, token) {
+    return (0, _index.default)(date.getUTCHours(), token.length);
+  },
+  // Minute
+  m: function m(date, token) {
+    return (0, _index.default)(date.getUTCMinutes(), token.length);
+  },
+  // Second
+  s: function s(date, token) {
+    return (0, _index.default)(date.getUTCSeconds(), token.length);
+  },
+  // Fraction of second
+  S: function S(date, token) {
+    var numberOfDigits = token.length;
+    var milliseconds = date.getUTCMilliseconds();
+    var fractionalSeconds = Math.floor(milliseconds * Math.pow(10, numberOfDigits - 3));
+    return (0, _index.default)(fractionalSeconds, token.length);
+  }
+};
+var _default = formatters;
+exports.default = _default;
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/format/longFormatters/index.js

@@ -0,0 +1,88 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var dateLongFormatter = function dateLongFormatter(pattern, formatLong) {
+  switch (pattern) {
+    case 'P':
+      return formatLong.date({
+        width: 'short'
+      });
+    case 'PP':
+      return formatLong.date({
+        width: 'medium'
+      });
+    case 'PPP':
+      return formatLong.date({
+        width: 'long'
+      });
+    case 'PPPP':
+    default:
+      return formatLong.date({
+        width: 'full'
+      });
+  }
+};
+var timeLongFormatter = function timeLongFormatter(pattern, formatLong) {
+  switch (pattern) {
+    case 'p':
+      return formatLong.time({
+        width: 'short'
+      });
+    case 'pp':
+      return formatLong.time({
+        width: 'medium'
+      });
+    case 'ppp':
+      return formatLong.time({
+        width: 'long'
+      });
+    case 'pppp':
+    default:
+      return formatLong.time({
+        width: 'full'
+      });
+  }
+};
+var dateTimeLongFormatter = function dateTimeLongFormatter(pattern, formatLong) {
+  var matchResult = pattern.match(/(P+)(p+)?/) || [];
+  var datePattern = matchResult[1];
+  var timePattern = matchResult[2];
+  if (!timePattern) {
+    return dateLongFormatter(pattern, formatLong);
+  }
+  var dateTimeFormat;
+  switch (datePattern) {
+    case 'P':
+      dateTimeFormat = formatLong.dateTime({
+        width: 'short'
+      });
+      break;
+    case 'PP':
+      dateTimeFormat = formatLong.dateTime({
+        width: 'medium'
+      });
+      break;
+    case 'PPP':
+      dateTimeFormat = formatLong.dateTime({
+        width: 'long'
+      });
+      break;
+    case 'PPPP':
+    default:
+      dateTimeFormat = formatLong.dateTime({
+        width: 'full'
+      });
+      break;
+  }
+  return dateTimeFormat.replace('{{date}}', dateLongFormatter(datePattern, formatLong)).replace('{{time}}', timeLongFormatter(timePattern, formatLong));
+};
+var longFormatters = {
+  p: timeLongFormatter,
+  P: dateTimeLongFormatter
+};
+var _default = longFormatters;
+exports.default = _default;
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/getTimezoneOffsetInMilliseconds/index.js

@@ -0,0 +1,23 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getTimezoneOffsetInMilliseconds;
+/**
+ * Google Chrome as of 67.0.3396.87 introduced timezones with offset that includes seconds.
+ * They usually appear for dates that denote time before the timezones were introduced
+ * (e.g. for 'Europe/Prague' timezone the offset is GMT+00:57:44 before 1 October 1891
+ * and GMT+01:00:00 after that date)
+ *
+ * Date#getTimezoneOffset returns the offset in minutes and would return 57 for the example above,
+ * which would lead to incorrect calculations.
+ *
+ * This function returns the timezone offset in milliseconds that takes seconds in account.
+ */
+function getTimezoneOffsetInMilliseconds(date) {
+  var utcDate = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds()));
+  utcDate.setUTCFullYear(date.getFullYear());
+  return date.getTime() - utcDate.getTime();
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/getUTCDayOfYear/index.js

@@ -0,0 +1,21 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getUTCDayOfYear;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var MILLISECONDS_IN_DAY = 86400000;
+function getUTCDayOfYear(dirtyDate) {
+  (0, _index2.default)(1, arguments);
+  var date = (0, _index.default)(dirtyDate);
+  var timestamp = date.getTime();
+  date.setUTCMonth(0, 1);
+  date.setUTCHours(0, 0, 0, 0);
+  var startOfYearTimestamp = date.getTime();
+  var difference = timestamp - startOfYearTimestamp;
+  return Math.floor(difference / MILLISECONDS_IN_DAY) + 1;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/getUTCISOWeek/index.js

@@ -0,0 +1,23 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getUTCISOWeek;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../startOfUTCISOWeek/index.js"));
+var _index3 = _interopRequireDefault(require("../startOfUTCISOWeekYear/index.js"));
+var _index4 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var MILLISECONDS_IN_WEEK = 604800000;
+function getUTCISOWeek(dirtyDate) {
+  (0, _index4.default)(1, arguments);
+  var date = (0, _index.default)(dirtyDate);
+  var diff = (0, _index2.default)(date).getTime() - (0, _index3.default)(date).getTime();
+
+  // 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(diff / MILLISECONDS_IN_WEEK) + 1;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/getUTCISOWeekYear/index.js

@@ -0,0 +1,31 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getUTCISOWeekYear;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var _index3 = _interopRequireDefault(require("../startOfUTCISOWeek/index.js"));
+function getUTCISOWeekYear(dirtyDate) {
+  (0, _index2.default)(1, arguments);
+  var date = (0, _index.default)(dirtyDate);
+  var year = date.getUTCFullYear();
+  var fourthOfJanuaryOfNextYear = new Date(0);
+  fourthOfJanuaryOfNextYear.setUTCFullYear(year + 1, 0, 4);
+  fourthOfJanuaryOfNextYear.setUTCHours(0, 0, 0, 0);
+  var startOfNextYear = (0, _index3.default)(fourthOfJanuaryOfNextYear);
+  var fourthOfJanuaryOfThisYear = new Date(0);
+  fourthOfJanuaryOfThisYear.setUTCFullYear(year, 0, 4);
+  fourthOfJanuaryOfThisYear.setUTCHours(0, 0, 0, 0);
+  var startOfThisYear = (0, _index3.default)(fourthOfJanuaryOfThisYear);
+  if (date.getTime() >= startOfNextYear.getTime()) {
+    return year + 1;
+  } else if (date.getTime() >= startOfThisYear.getTime()) {
+    return year;
+  } else {
+    return year - 1;
+  }
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/getUTCWeek/index.js

@@ -0,0 +1,23 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getUTCWeek;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../startOfUTCWeek/index.js"));
+var _index3 = _interopRequireDefault(require("../startOfUTCWeekYear/index.js"));
+var _index4 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var MILLISECONDS_IN_WEEK = 604800000;
+function getUTCWeek(dirtyDate, options) {
+  (0, _index4.default)(1, arguments);
+  var date = (0, _index.default)(dirtyDate);
+  var diff = (0, _index2.default)(date, options).getTime() - (0, _index3.default)(date, options).getTime();
+
+  // 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(diff / MILLISECONDS_IN_WEEK) + 1;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/getUTCWeekYear/index.js

@@ -0,0 +1,41 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getUTCWeekYear;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var _index3 = _interopRequireDefault(require("../startOfUTCWeek/index.js"));
+var _index4 = _interopRequireDefault(require("../toInteger/index.js"));
+var _index5 = require("../defaultOptions/index.js");
+function getUTCWeekYear(dirtyDate, options) {
+  var _ref, _ref2, _ref3, _options$firstWeekCon, _options$locale, _options$locale$optio, _defaultOptions$local, _defaultOptions$local2;
+  (0, _index2.default)(1, arguments);
+  var date = (0, _index.default)(dirtyDate);
+  var year = date.getUTCFullYear();
+  var defaultOptions = (0, _index5.getDefaultOptions)();
+  var firstWeekContainsDate = (0, _index4.default)((_ref = (_ref2 = (_ref3 = (_options$firstWeekCon = options === null || options === void 0 ? void 0 : options.firstWeekContainsDate) !== null && _options$firstWeekCon !== void 0 ? _options$firstWeekCon : options === null || options === void 0 ? void 0 : (_options$locale = options.locale) === null || _options$locale === void 0 ? void 0 : (_options$locale$optio = _options$locale.options) === null || _options$locale$optio === void 0 ? void 0 : _options$locale$optio.firstWeekContainsDate) !== null && _ref3 !== void 0 ? _ref3 : defaultOptions.firstWeekContainsDate) !== null && _ref2 !== void 0 ? _ref2 : (_defaultOptions$local = defaultOptions.locale) === null || _defaultOptions$local === void 0 ? void 0 : (_defaultOptions$local2 = _defaultOptions$local.options) === null || _defaultOptions$local2 === void 0 ? void 0 : _defaultOptions$local2.firstWeekContainsDate) !== null && _ref !== void 0 ? _ref : 1);
+
+  // Test if weekStartsOn is between 1 and 7 _and_ is not NaN
+  if (!(firstWeekContainsDate >= 1 && firstWeekContainsDate <= 7)) {
+    throw new RangeError('firstWeekContainsDate must be between 1 and 7 inclusively');
+  }
+  var firstWeekOfNextYear = new Date(0);
+  firstWeekOfNextYear.setUTCFullYear(year + 1, 0, firstWeekContainsDate);
+  firstWeekOfNextYear.setUTCHours(0, 0, 0, 0);
+  var startOfNextYear = (0, _index3.default)(firstWeekOfNextYear, options);
+  var firstWeekOfThisYear = new Date(0);
+  firstWeekOfThisYear.setUTCFullYear(year, 0, firstWeekContainsDate);
+  firstWeekOfThisYear.setUTCHours(0, 0, 0, 0);
+  var startOfThisYear = (0, _index3.default)(firstWeekOfThisYear, options);
+  if (date.getTime() >= startOfNextYear.getTime()) {
+    return year + 1;
+  } else if (date.getTime() >= startOfThisYear.getTime()) {
+    return year;
+  } else {
+    return year - 1;
+  }
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/isSameUTCWeek/index.js

@@ -0,0 +1,16 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = isSameUTCWeek;
+var _index = _interopRequireDefault(require("../requiredArgs/index.js"));
+var _index2 = _interopRequireDefault(require("../startOfUTCWeek/index.js"));
+function isSameUTCWeek(dirtyDateLeft, dirtyDateRight, options) {
+  (0, _index.default)(2, arguments);
+  var dateLeftStartOfWeek = (0, _index2.default)(dirtyDateLeft, options);
+  var dateRightStartOfWeek = (0, _index2.default)(dirtyDateRight, options);
+  return dateLeftStartOfWeek.getTime() === dateRightStartOfWeek.getTime();
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/protectedTokens/index.js

@@ -0,0 +1,27 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.isProtectedDayOfYearToken = isProtectedDayOfYearToken;
+exports.isProtectedWeekYearToken = isProtectedWeekYearToken;
+exports.throwProtectedError = throwProtectedError;
+var protectedDayOfYearTokens = ['D', 'DD'];
+var protectedWeekYearTokens = ['YY', 'YYYY'];
+function isProtectedDayOfYearToken(token) {
+  return protectedDayOfYearTokens.indexOf(token) !== -1;
+}
+function isProtectedWeekYearToken(token) {
+  return protectedWeekYearTokens.indexOf(token) !== -1;
+}
+function throwProtectedError(token, format, input) {
+  if (token === 'YYYY') {
+    throw new RangeError("Use `yyyy` instead of `YYYY` (in `".concat(format, "`) for formatting years to the input `").concat(input, "`; see: https://github.com/date-fns/date-fns/blob/master/docs/unicodeTokens.md"));
+  } else if (token === 'YY') {
+    throw new RangeError("Use `yy` instead of `YY` (in `".concat(format, "`) for formatting years to the input `").concat(input, "`; see: https://github.com/date-fns/date-fns/blob/master/docs/unicodeTokens.md"));
+  } else if (token === 'D') {
+    throw new RangeError("Use `d` instead of `D` (in `".concat(format, "`) for formatting days of the month to the input `").concat(input, "`; see: https://github.com/date-fns/date-fns/blob/master/docs/unicodeTokens.md"));
+  } else if (token === 'DD') {
+    throw new RangeError("Use `dd` instead of `DD` (in `".concat(format, "`) for formatting days of the month to the input `").concat(input, "`; see: https://github.com/date-fns/date-fns/blob/master/docs/unicodeTokens.md"));
+  }
+}

backend/node_modules/date-fns/_lib/requiredArgs/index.js

@@ -0,0 +1,12 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = requiredArgs;
+function requiredArgs(required, args) {
+  if (args.length < required) {
+    throw new TypeError(required + ' argument' + (required > 1 ? 's' : '') + ' required, but only ' + args.length + ' present');
+  }
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/roundingMethods/index.js

@@ -0,0 +1,19 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getRoundingMethod = getRoundingMethod;
+var roundingMap = {
+  ceil: Math.ceil,
+  round: Math.round,
+  floor: Math.floor,
+  trunc: function trunc(value) {
+    return value < 0 ? Math.ceil(value) : Math.floor(value);
+  } // Math.trunc is not supported by IE
+};
+
+var defaultRoundingMethod = 'trunc';
+function getRoundingMethod(method) {
+  return method ? roundingMap[method] : roundingMap[defaultRoundingMethod];
+}

backend/node_modules/date-fns/_lib/setUTCDay/index.js

@@ -0,0 +1,31 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = setUTCDay;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var _index3 = _interopRequireDefault(require("../toInteger/index.js"));
+var _index4 = require("../defaultOptions/index.js");
+function setUTCDay(dirtyDate, dirtyDay, options) {
+  var _ref, _ref2, _ref3, _options$weekStartsOn, _options$locale, _options$locale$optio, _defaultOptions$local, _defaultOptions$local2;
+  (0, _index2.default)(2, arguments);
+  var defaultOptions = (0, _index4.getDefaultOptions)();
+  var weekStartsOn = (0, _index3.default)((_ref = (_ref2 = (_ref3 = (_options$weekStartsOn = options === null || options === void 0 ? void 0 : options.weekStartsOn) !== null && _options$weekStartsOn !== void 0 ? _options$weekStartsOn : options === null || options === void 0 ? void 0 : (_options$locale = options.locale) === null || _options$locale === void 0 ? void 0 : (_options$locale$optio = _options$locale.options) === null || _options$locale$optio === void 0 ? void 0 : _options$locale$optio.weekStartsOn) !== null && _ref3 !== void 0 ? _ref3 : defaultOptions.weekStartsOn) !== null && _ref2 !== void 0 ? _ref2 : (_defaultOptions$local = defaultOptions.locale) === null || _defaultOptions$local === void 0 ? void 0 : (_defaultOptions$local2 = _defaultOptions$local.options) === null || _defaultOptions$local2 === void 0 ? void 0 : _defaultOptions$local2.weekStartsOn) !== null && _ref !== void 0 ? _ref : 0);
+
+  // Test if weekStartsOn is between 0 and 6 _and_ is not NaN
+  if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
+    throw new RangeError('weekStartsOn must be between 0 and 6 inclusively');
+  }
+  var date = (0, _index.default)(dirtyDate);
+  var day = (0, _index3.default)(dirtyDay);
+  var currentDay = date.getUTCDay();
+  var remainder = day % 7;
+  var dayIndex = (remainder + 7) % 7;
+  var diff = (dayIndex < weekStartsOn ? 7 : 0) + day - currentDay;
+  date.setUTCDate(date.getUTCDate() + diff);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/setUTCISODay/index.js

@@ -0,0 +1,26 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = setUTCISODay;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var _index3 = _interopRequireDefault(require("../toInteger/index.js"));
+function setUTCISODay(dirtyDate, dirtyDay) {
+  (0, _index2.default)(2, arguments);
+  var day = (0, _index3.default)(dirtyDay);
+  if (day % 7 === 0) {
+    day = day - 7;
+  }
+  var weekStartsOn = 1;
+  var date = (0, _index.default)(dirtyDate);
+  var currentDay = date.getUTCDay();
+  var remainder = day % 7;
+  var dayIndex = (remainder + 7) % 7;
+  var diff = (dayIndex < weekStartsOn ? 7 : 0) + day - currentDay;
+  date.setUTCDate(date.getUTCDate() + diff);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/setUTCISOWeek/index.js

@@ -0,0 +1,20 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = setUTCISOWeek;
+var _index = _interopRequireDefault(require("../toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../../toDate/index.js"));
+var _index3 = _interopRequireDefault(require("../getUTCISOWeek/index.js"));
+var _index4 = _interopRequireDefault(require("../requiredArgs/index.js"));
+function setUTCISOWeek(dirtyDate, dirtyISOWeek) {
+  (0, _index4.default)(2, arguments);
+  var date = (0, _index2.default)(dirtyDate);
+  var isoWeek = (0, _index.default)(dirtyISOWeek);
+  var diff = (0, _index3.default)(date) - isoWeek;
+  date.setUTCDate(date.getUTCDate() - diff * 7);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/setUTCWeek/index.js

@@ -0,0 +1,20 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = setUTCWeek;
+var _index = _interopRequireDefault(require("../toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../../toDate/index.js"));
+var _index3 = _interopRequireDefault(require("../getUTCWeek/index.js"));
+var _index4 = _interopRequireDefault(require("../requiredArgs/index.js"));
+function setUTCWeek(dirtyDate, dirtyWeek, options) {
+  (0, _index4.default)(2, arguments);
+  var date = (0, _index2.default)(dirtyDate);
+  var week = (0, _index.default)(dirtyWeek);
+  var diff = (0, _index3.default)(date, options) - week;
+  date.setUTCDate(date.getUTCDate() - diff * 7);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/startOfUTCISOWeek/index.js

@@ -0,0 +1,20 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = startOfUTCISOWeek;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+function startOfUTCISOWeek(dirtyDate) {
+  (0, _index2.default)(1, arguments);
+  var weekStartsOn = 1;
+  var date = (0, _index.default)(dirtyDate);
+  var day = date.getUTCDay();
+  var diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn;
+  date.setUTCDate(date.getUTCDate() - diff);
+  date.setUTCHours(0, 0, 0, 0);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/startOfUTCISOWeekYear/index.js

@@ -0,0 +1,20 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = startOfUTCISOWeekYear;
+var _index = _interopRequireDefault(require("../getUTCISOWeekYear/index.js"));
+var _index2 = _interopRequireDefault(require("../startOfUTCISOWeek/index.js"));
+var _index3 = _interopRequireDefault(require("../requiredArgs/index.js"));
+function startOfUTCISOWeekYear(dirtyDate) {
+  (0, _index3.default)(1, arguments);
+  var year = (0, _index.default)(dirtyDate);
+  var fourthOfJanuary = new Date(0);
+  fourthOfJanuary.setUTCFullYear(year, 0, 4);
+  fourthOfJanuary.setUTCHours(0, 0, 0, 0);
+  var date = (0, _index2.default)(fourthOfJanuary);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/startOfUTCWeek/index.js

@@ -0,0 +1,29 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = startOfUTCWeek;
+var _index = _interopRequireDefault(require("../../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var _index3 = _interopRequireDefault(require("../toInteger/index.js"));
+var _index4 = require("../defaultOptions/index.js");
+function startOfUTCWeek(dirtyDate, options) {
+  var _ref, _ref2, _ref3, _options$weekStartsOn, _options$locale, _options$locale$optio, _defaultOptions$local, _defaultOptions$local2;
+  (0, _index2.default)(1, arguments);
+  var defaultOptions = (0, _index4.getDefaultOptions)();
+  var weekStartsOn = (0, _index3.default)((_ref = (_ref2 = (_ref3 = (_options$weekStartsOn = options === null || options === void 0 ? void 0 : options.weekStartsOn) !== null && _options$weekStartsOn !== void 0 ? _options$weekStartsOn : options === null || options === void 0 ? void 0 : (_options$locale = options.locale) === null || _options$locale === void 0 ? void 0 : (_options$locale$optio = _options$locale.options) === null || _options$locale$optio === void 0 ? void 0 : _options$locale$optio.weekStartsOn) !== null && _ref3 !== void 0 ? _ref3 : defaultOptions.weekStartsOn) !== null && _ref2 !== void 0 ? _ref2 : (_defaultOptions$local = defaultOptions.locale) === null || _defaultOptions$local === void 0 ? void 0 : (_defaultOptions$local2 = _defaultOptions$local.options) === null || _defaultOptions$local2 === void 0 ? void 0 : _defaultOptions$local2.weekStartsOn) !== null && _ref !== void 0 ? _ref : 0);
+
+  // Test if weekStartsOn is between 0 and 6 _and_ is not NaN
+  if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
+    throw new RangeError('weekStartsOn must be between 0 and 6 inclusively');
+  }
+  var date = (0, _index.default)(dirtyDate);
+  var day = date.getUTCDay();
+  var diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn;
+  date.setUTCDate(date.getUTCDate() - diff);
+  date.setUTCHours(0, 0, 0, 0);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/startOfUTCWeekYear/index.js

@@ -0,0 +1,25 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = startOfUTCWeekYear;
+var _index = _interopRequireDefault(require("../getUTCWeekYear/index.js"));
+var _index2 = _interopRequireDefault(require("../requiredArgs/index.js"));
+var _index3 = _interopRequireDefault(require("../startOfUTCWeek/index.js"));
+var _index4 = _interopRequireDefault(require("../toInteger/index.js"));
+var _index5 = require("../defaultOptions/index.js");
+function startOfUTCWeekYear(dirtyDate, options) {
+  var _ref, _ref2, _ref3, _options$firstWeekCon, _options$locale, _options$locale$optio, _defaultOptions$local, _defaultOptions$local2;
+  (0, _index2.default)(1, arguments);
+  var defaultOptions = (0, _index5.getDefaultOptions)();
+  var firstWeekContainsDate = (0, _index4.default)((_ref = (_ref2 = (_ref3 = (_options$firstWeekCon = options === null || options === void 0 ? void 0 : options.firstWeekContainsDate) !== null && _options$firstWeekCon !== void 0 ? _options$firstWeekCon : options === null || options === void 0 ? void 0 : (_options$locale = options.locale) === null || _options$locale === void 0 ? void 0 : (_options$locale$optio = _options$locale.options) === null || _options$locale$optio === void 0 ? void 0 : _options$locale$optio.firstWeekContainsDate) !== null && _ref3 !== void 0 ? _ref3 : defaultOptions.firstWeekContainsDate) !== null && _ref2 !== void 0 ? _ref2 : (_defaultOptions$local = defaultOptions.locale) === null || _defaultOptions$local === void 0 ? void 0 : (_defaultOptions$local2 = _defaultOptions$local.options) === null || _defaultOptions$local2 === void 0 ? void 0 : _defaultOptions$local2.firstWeekContainsDate) !== null && _ref !== void 0 ? _ref : 1);
+  var year = (0, _index.default)(dirtyDate, options);
+  var firstWeek = new Date(0);
+  firstWeek.setUTCFullYear(year, 0, firstWeekContainsDate);
+  firstWeek.setUTCHours(0, 0, 0, 0);
+  var date = (0, _index3.default)(firstWeek, options);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/_lib/test/index.js

@@ -0,0 +1,33 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.assertType = assertType;
+exports.generateOffset = generateOffset;
+exports.resetDefaultOptions = resetDefaultOptions;
+var _index = _interopRequireDefault(require("../addLeadingZeros/index.js"));
+var _index2 = require("../defaultOptions/index.js");
+function assertType(_) {}
+function resetDefaultOptions() {
+  (0, _index2.setDefaultOptions)({});
+}
+
+// This makes sure we create the consistent offsets across timezones, no matter where these tests are ran.
+function generateOffset(originalDate) {
+  // Add the timezone.
+  var offset = '';
+  var tzOffset = originalDate.getTimezoneOffset();
+  if (tzOffset !== 0) {
+    var absoluteOffset = Math.abs(tzOffset);
+    var hourOffset = (0, _index.default)(Math.floor(absoluteOffset / 60), 2);
+    var minuteOffset = (0, _index.default)(absoluteOffset % 60, 2);
+    // If less than 0, the sign is +, because it is ahead of time.
+    var sign = tzOffset < 0 ? '+' : '-';
+    offset = "".concat(sign).concat(hourOffset, ":").concat(minuteOffset);
+  } else {
+    offset = 'Z';
+  }
+  return offset;
+}

backend/node_modules/date-fns/_lib/toInteger/index.js

@@ -0,0 +1,17 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = toInteger;
+function toInteger(dirtyNumber) {
+  if (dirtyNumber === null || dirtyNumber === true || dirtyNumber === false) {
+    return NaN;
+  }
+  var number = Number(dirtyNumber);
+  if (isNaN(number)) {
+    return number;
+  }
+  return number < 0 ? Math.ceil(number) : Math.floor(number);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/add/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { add } from 'date-fns'
+export default add

backend/node_modules/date-fns/add/index.js

@@ -0,0 +1,78 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = add;
+var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));
+var _index = _interopRequireDefault(require("../addDays/index.js"));
+var _index2 = _interopRequireDefault(require("../addMonths/index.js"));
+var _index3 = _interopRequireDefault(require("../toDate/index.js"));
+var _index4 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+var _index5 = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+/**
+ * @name add
+ * @category Common Helpers
+ * @summary Add the specified years, months, weeks, days, hours, minutes and seconds to the given date.
+ *
+ * @description
+ * Add the specified years, months, weeks, days, hours, minutes and seconds to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Duration} duration - the object with years, months, weeks, days, hours, minutes and seconds to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ *
+ * | Key            | Description                        |
+ * |----------------|------------------------------------|
+ * | years          | Amount of years to be added        |
+ * | months         | Amount of months to be added       |
+ * | weeks          | Amount of weeks to be added        |
+ * | days           | Amount of days to be added         |
+ * | hours          | Amount of hours to be added        |
+ * | minutes        | Amount of minutes to be added      |
+ * | seconds        | Amount of seconds to be added      |
+ *
+ * All values default to 0
+ *
+ * @returns {Date} the new date with the seconds added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add the following duration to 1 September 2014, 10:19:50
+ * const result = add(new Date(2014, 8, 1, 10, 19, 50), {
+ *   years: 2,
+ *   months: 9,
+ *   weeks: 1,
+ *   days: 7,
+ *   hours: 5,
+ *   minutes: 9,
+ *   seconds: 30,
+ * })
+ * //=> Thu Jun 15 2017 15:29:20
+ */
+function add(dirtyDate, duration) {
+  (0, _index4.default)(2, arguments);
+  if (!duration || (0, _typeof2.default)(duration) !== 'object') return new Date(NaN);
+  var years = duration.years ? (0, _index5.default)(duration.years) : 0;
+  var months = duration.months ? (0, _index5.default)(duration.months) : 0;
+  var weeks = duration.weeks ? (0, _index5.default)(duration.weeks) : 0;
+  var days = duration.days ? (0, _index5.default)(duration.days) : 0;
+  var hours = duration.hours ? (0, _index5.default)(duration.hours) : 0;
+  var minutes = duration.minutes ? (0, _index5.default)(duration.minutes) : 0;
+  var seconds = duration.seconds ? (0, _index5.default)(duration.seconds) : 0;
+
+  // Add years and months
+  var date = (0, _index3.default)(dirtyDate);
+  var dateWithMonths = months || years ? (0, _index2.default)(date, months + years * 12) : date;
+
+  // Add weeks and days
+  var dateWithDays = days || weeks ? (0, _index.default)(dateWithMonths, days + weeks * 7) : dateWithMonths;
+
+  // Add days, hours, minutes and seconds
+  var minutesToAdd = minutes + hours * 60;
+  var secondsToAdd = seconds + minutesToAdd * 60;
+  var msToAdd = secondsToAdd * 1000;
+  var finalDate = new Date(dateWithDays.getTime() + msToAdd);
+  return finalDate;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/add/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, duration: Duration) => Date

backend/node_modules/date-fns/add/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/add/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addBusinessDays/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addBusinessDays } from 'date-fns'
+export default addBusinessDays

backend/node_modules/date-fns/addBusinessDays/index.js

@@ -0,0 +1,66 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addBusinessDays;
+var _index = _interopRequireDefault(require("../isWeekend/index.js"));
+var _index2 = _interopRequireDefault(require("../toDate/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index4 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+var _index5 = _interopRequireDefault(require("../isSunday/index.js"));
+var _index6 = _interopRequireDefault(require("../isSaturday/index.js"));
+/**
+ * @name addBusinessDays
+ * @category Day Helpers
+ * @summary Add the specified number of business days (mon - fri) to the given date.
+ *
+ * @description
+ * Add the specified number of business days (mon - fri) to the given date, ignoring weekends.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of business days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the business days added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 10 business days to 1 September 2014:
+ * const result = addBusinessDays(new Date(2014, 8, 1), 10)
+ * //=> Mon Sep 15 2014 00:00:00 (skipped weekend days)
+ */
+function addBusinessDays(dirtyDate, dirtyAmount) {
+  (0, _index4.default)(2, arguments);
+  var date = (0, _index2.default)(dirtyDate);
+  var startedOnWeekend = (0, _index.default)(date);
+  var amount = (0, _index3.default)(dirtyAmount);
+  if (isNaN(amount)) return new Date(NaN);
+  var hours = date.getHours();
+  var sign = amount < 0 ? -1 : 1;
+  var fullWeeks = (0, _index3.default)(amount / 5);
+  date.setDate(date.getDate() + fullWeeks * 7);
+
+  // Get remaining days not part of a full week
+  var restDays = Math.abs(amount % 5);
+
+  // Loops over remaining days
+  while (restDays > 0) {
+    date.setDate(date.getDate() + sign);
+    if (!(0, _index.default)(date)) restDays -= 1;
+  }
+
+  // If the date is a weekend day and we reduce a dividable of
+  // 5 from it, we land on a weekend date.
+  // To counter this, we add days accordingly to land on the next business day
+  if (startedOnWeekend && (0, _index.default)(date) && amount !== 0) {
+    // If we're reducing days, we want to add days until we land on a weekday
+    // If we're adding days we want to reduce days until we land on a weekday
+    if ((0, _index6.default)(date)) date.setDate(date.getDate() + (sign < 0 ? 2 : -1));
+    if ((0, _index5.default)(date)) date.setDate(date.getDate() + (sign < 0 ? 1 : -2));
+  }
+
+  // Restore hours to avoid DST lag
+  date.setHours(hours);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addBusinessDays/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addBusinessDays/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addBusinessDays/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addDays/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addDays } from 'date-fns'
+export default addDays

backend/node_modules/date-fns/addDays/index.js

@@ -0,0 +1,43 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addDays;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../toDate/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addDays
+ * @category Day Helpers
+ * @summary Add the specified number of days to the given date.
+ *
+ * @description
+ * Add the specified number of days to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} - the new date with the days added
+ * @throws {TypeError} - 2 arguments required
+ *
+ * @example
+ * // Add 10 days to 1 September 2014:
+ * const result = addDays(new Date(2014, 8, 1), 10)
+ * //=> Thu Sep 11 2014 00:00:00
+ */
+function addDays(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var date = (0, _index2.default)(dirtyDate);
+  var amount = (0, _index.default)(dirtyAmount);
+  if (isNaN(amount)) {
+    return new Date(NaN);
+  }
+  if (!amount) {
+    // If 0 days, no-op to avoid changing times in the hour before end of DST
+    return date;
+  }
+  date.setDate(date.getDate() + amount);
+  return date;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addDays/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addDays/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addDays/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addHours/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addHours } from 'date-fns'
+export default addHours

backend/node_modules/date-fns/addHours/index.js

@@ -0,0 +1,36 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addHours;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../addMilliseconds/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+var MILLISECONDS_IN_HOUR = 3600000;
+
+/**
+ * @name addHours
+ * @category Hour Helpers
+ * @summary Add the specified number of hours to the given date.
+ *
+ * @description
+ * Add the specified number of hours to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of hours to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the hours added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 2 hours to 10 July 2014 23:00:00:
+ * const result = addHours(new Date(2014, 6, 10, 23, 0), 2)
+ * //=> Fri Jul 11 2014 01:00:00
+ */
+function addHours(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var amount = (0, _index.default)(dirtyAmount);
+  return (0, _index2.default)(dirtyDate, amount * MILLISECONDS_IN_HOUR);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addHours/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addHours/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addHours/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addISOWeekYears/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addISOWeekYears } from 'date-fns'
+export default addISOWeekYears

backend/node_modules/date-fns/addISOWeekYears/index.js

@@ -0,0 +1,37 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addISOWeekYears;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../getISOWeekYear/index.js"));
+var _index3 = _interopRequireDefault(require("../setISOWeekYear/index.js"));
+var _index4 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addISOWeekYears
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Add the specified number of ISO week-numbering years to the given date.
+ *
+ * @description
+ * Add the specified number of ISO week-numbering years to the given date.
+ *
+ * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of ISO week-numbering years to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the ISO week-numbering years added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 5 ISO week-numbering years to 2 July 2010:
+ * const result = addISOWeekYears(new Date(2010, 6, 2), 5)
+ * //=> Fri Jun 26 2015 00:00:00
+ */
+function addISOWeekYears(dirtyDate, dirtyAmount) {
+  (0, _index4.default)(2, arguments);
+  var amount = (0, _index.default)(dirtyAmount);
+  return (0, _index3.default)(dirtyDate, (0, _index2.default)(dirtyDate) + amount);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addISOWeekYears/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addISOWeekYears/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addISOWeekYears/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addMilliseconds/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addMilliseconds } from 'date-fns'
+export default addMilliseconds

backend/node_modules/date-fns/addMilliseconds/index.js

@@ -0,0 +1,35 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addMilliseconds;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../toDate/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addMilliseconds
+ * @category Millisecond Helpers
+ * @summary Add the specified number of milliseconds to the given date.
+ *
+ * @description
+ * Add the specified number of milliseconds to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of milliseconds to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the milliseconds added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 750 milliseconds to 10 July 2014 12:45:30.000:
+ * const result = addMilliseconds(new Date(2014, 6, 10, 12, 45, 30, 0), 750)
+ * //=> Thu Jul 10 2014 12:45:30.750
+ */
+function addMilliseconds(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var timestamp = (0, _index2.default)(dirtyDate).getTime();
+  var amount = (0, _index.default)(dirtyAmount);
+  return new Date(timestamp + amount);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addMilliseconds/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addMilliseconds/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addMilliseconds/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addMinutes/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addMinutes } from 'date-fns'
+export default addMinutes

backend/node_modules/date-fns/addMinutes/index.js

@@ -0,0 +1,36 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addMinutes;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../addMilliseconds/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+var MILLISECONDS_IN_MINUTE = 60000;
+
+/**
+ * @name addMinutes
+ * @category Minute Helpers
+ * @summary Add the specified number of minutes to the given date.
+ *
+ * @description
+ * Add the specified number of minutes to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of minutes to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the minutes added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 30 minutes to 10 July 2014 12:00:00:
+ * const result = addMinutes(new Date(2014, 6, 10, 12, 0), 30)
+ * //=> Thu Jul 10 2014 12:30:00
+ */
+function addMinutes(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var amount = (0, _index.default)(dirtyAmount);
+  return (0, _index2.default)(dirtyDate, amount * MILLISECONDS_IN_MINUTE);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addMinutes/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addMinutes/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addMinutes/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addMonths/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addMonths } from 'date-fns'
+export default addMonths

backend/node_modules/date-fns/addMonths/index.js

@@ -0,0 +1,69 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addMonths;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../toDate/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addMonths
+ * @category Month Helpers
+ * @summary Add the specified number of months to the given date.
+ *
+ * @description
+ * Add the specified number of months to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of months to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the months added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 5 months to 1 September 2014:
+ * const result = addMonths(new Date(2014, 8, 1), 5)
+ * //=> Sun Feb 01 2015 00:00:00
+ */
+function addMonths(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var date = (0, _index2.default)(dirtyDate);
+  var amount = (0, _index.default)(dirtyAmount);
+  if (isNaN(amount)) {
+    return new Date(NaN);
+  }
+  if (!amount) {
+    // If 0 months, no-op to avoid changing times in the hour before end of DST
+    return date;
+  }
+  var dayOfMonth = date.getDate();
+
+  // The JS Date object supports date math by accepting out-of-bounds values for
+  // month, day, etc. For example, new Date(2020, 0, 0) returns 31 Dec 2019 and
+  // new Date(2020, 13, 1) returns 1 Feb 2021.  This is *almost* the behavior we
+  // want except that dates will wrap around the end of a month, meaning that
+  // new Date(2020, 13, 31) will return 3 Mar 2021 not 28 Feb 2021 as desired. So
+  // we'll default to the end of the desired month by adding 1 to the desired
+  // month and using a date of 0 to back up one day to the end of the desired
+  // month.
+  var endOfDesiredMonth = new Date(date.getTime());
+  endOfDesiredMonth.setMonth(date.getMonth() + amount + 1, 0);
+  var daysInMonth = endOfDesiredMonth.getDate();
+  if (dayOfMonth >= daysInMonth) {
+    // If we're already at the end of the month, then this is the correct date
+    // and we're done.
+    return endOfDesiredMonth;
+  } else {
+    // Otherwise, we now know that setting the original day-of-month value won't
+    // cause an overflow, so set the desired day-of-month. Note that we can't
+    // just set the date of `endOfDesiredMonth` because that object may have had
+    // its time changed in the unusual case where where a DST transition was on
+    // the last day of the month and its local time was in the hour skipped or
+    // repeated next to a DST transition.  So we use `date` instead which is
+    // guaranteed to still have the original time.
+    date.setFullYear(endOfDesiredMonth.getFullYear(), endOfDesiredMonth.getMonth(), dayOfMonth);
+    return date;
+  }
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addMonths/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addMonths/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addMonths/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addQuarters/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addQuarters } from 'date-fns'
+export default addQuarters

backend/node_modules/date-fns/addQuarters/index.js

@@ -0,0 +1,35 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addQuarters;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../addMonths/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addQuarters
+ * @category Quarter Helpers
+ * @summary Add the specified number of year quarters to the given date.
+ *
+ * @description
+ * Add the specified number of year quarters to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of quarters to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the quarters added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 1 quarter to 1 September 2014:
+ * const result = addQuarters(new Date(2014, 8, 1), 1)
+ * //=> Mon Dec 01 2014 00:00:00
+ */
+function addQuarters(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var amount = (0, _index.default)(dirtyAmount);
+  var months = amount * 3;
+  return (0, _index2.default)(dirtyDate, months);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addQuarters/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addQuarters/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addQuarters/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addSeconds/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addSeconds } from 'date-fns'
+export default addSeconds

backend/node_modules/date-fns/addSeconds/index.js

@@ -0,0 +1,34 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addSeconds;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../addMilliseconds/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addSeconds
+ * @category Second Helpers
+ * @summary Add the specified number of seconds to the given date.
+ *
+ * @description
+ * Add the specified number of seconds to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of seconds to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the seconds added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 30 seconds to 10 July 2014 12:45:00:
+ * const result = addSeconds(new Date(2014, 6, 10, 12, 45, 0), 30)
+ * //=> Thu Jul 10 2014 12:45:30
+ */
+function addSeconds(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var amount = (0, _index.default)(dirtyAmount);
+  return (0, _index2.default)(dirtyDate, amount * 1000);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addSeconds/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addSeconds/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addSeconds/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addWeeks/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addWeeks } from 'date-fns'
+export default addWeeks

backend/node_modules/date-fns/addWeeks/index.js

@@ -0,0 +1,35 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addWeeks;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../addDays/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addWeeks
+ * @category Week Helpers
+ * @summary Add the specified number of weeks to the given date.
+ *
+ * @description
+ * Add the specified number of week to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of weeks to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the weeks added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 4 weeks to 1 September 2014:
+ * const result = addWeeks(new Date(2014, 8, 1), 4)
+ * //=> Mon Sep 29 2014 00:00:00
+ */
+function addWeeks(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var amount = (0, _index.default)(dirtyAmount);
+  var days = amount * 7;
+  return (0, _index2.default)(dirtyDate, days);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addWeeks/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addWeeks/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addWeeks/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/addYears/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { addYears } from 'date-fns'
+export default addYears

backend/node_modules/date-fns/addYears/index.js

@@ -0,0 +1,34 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addYears;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../addMonths/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addYears
+ * @category Year Helpers
+ * @summary Add the specified number of years to the given date.
+ *
+ * @description
+ * Add the specified number of years to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of years to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the years added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 5 years to 1 September 2014:
+ * const result = addYears(new Date(2014, 8, 1), 5)
+ * //=> Sun Sep 01 2019 00:00:00
+ */
+function addYears(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var amount = (0, _index.default)(dirtyAmount);
+  return (0, _index2.default)(dirtyDate, amount * 12);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/addYears/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, amount: number) => Date

backend/node_modules/date-fns/addYears/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/addYears/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/areIntervalsOverlapping/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { areIntervalsOverlapping } from 'date-fns'
+export default areIntervalsOverlapping

backend/node_modules/date-fns/areIntervalsOverlapping/index.js

@@ -0,0 +1,81 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = areIntervalsOverlapping;
+var _index = _interopRequireDefault(require("../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name areIntervalsOverlapping
+ * @category Interval Helpers
+ * @summary Is the given time interval overlapping with another time interval?
+ *
+ * @description
+ * Is the given time interval overlapping with another time interval? Adjacent intervals do not count as overlapping.
+ *
+ * @param {Interval} intervalLeft - the first interval to compare. See [Interval]{@link https://date-fns.org/docs/Interval}
+ * @param {Interval} intervalRight - the second interval to compare. See [Interval]{@link https://date-fns.org/docs/Interval}
+ * @param {Object} [options] - the object with options
+ * @param {Boolean} [options.inclusive=false] - whether the comparison is inclusive or not
+ * @returns {Boolean} whether the time intervals are overlapping
+ * @throws {TypeError} 2 arguments required
+ * @throws {RangeError} The start of an interval cannot be after its end
+ * @throws {RangeError} Date in interval cannot be `Invalid Date`
+ *
+ * @example
+ * // For overlapping time intervals:
+ * areIntervalsOverlapping(
+ *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
+ *   { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
+ * )
+ * //=> true
+ *
+ * @example
+ * // For non-overlapping time intervals:
+ * areIntervalsOverlapping(
+ *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
+ *   { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) }
+ * )
+ * //=> false
+ *
+ * @example
+ * // For adjacent time intervals:
+ * areIntervalsOverlapping(
+ *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
+ *   { start: new Date(2014, 0, 20), end: new Date(2014, 0, 30) }
+ * )
+ * //=> false
+ *
+ * @example
+ * // Using the inclusive option:
+ * areIntervalsOverlapping(
+ *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
+ *   { start: new Date(2014, 0, 20), end: new Date(2014, 0, 24) }
+ * )
+ * //=> false
+ * areIntervalsOverlapping(
+ *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
+ *   { start: new Date(2014, 0, 20), end: new Date(2014, 0, 24) },
+ *   { inclusive: true }
+ * )
+ * //=> true
+ */
+function areIntervalsOverlapping(intervalLeft, intervalRight, options) {
+  (0, _index2.default)(2, arguments);
+  var leftStartTime = (0, _index.default)(intervalLeft === null || intervalLeft === void 0 ? void 0 : intervalLeft.start).getTime();
+  var leftEndTime = (0, _index.default)(intervalLeft === null || intervalLeft === void 0 ? void 0 : intervalLeft.end).getTime();
+  var rightStartTime = (0, _index.default)(intervalRight === null || intervalRight === void 0 ? void 0 : intervalRight.start).getTime();
+  var rightEndTime = (0, _index.default)(intervalRight === null || intervalRight === void 0 ? void 0 : intervalRight.end).getTime();
+
+  // Throw an exception if start date is after end date or if any date is `Invalid Date`
+  if (!(leftStartTime <= leftEndTime && rightStartTime <= rightEndTime)) {
+    throw new RangeError('Invalid interval');
+  }
+  if (options !== null && options !== void 0 && options.inclusive) {
+    return leftStartTime <= rightEndTime && rightStartTime <= leftEndTime;
+  }
+  return leftStartTime < rightEndTime && rightStartTime < leftEndTime;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/areIntervalsOverlapping/index.js.flow

@@ -0,0 +1,58 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (
+  intervalLeft: Interval,
+  intervalRight: Interval,
+  options?: {
+    inclusive?: boolean,
+  }
+) => boolean

backend/node_modules/date-fns/areIntervalsOverlapping/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/areIntervalsOverlapping/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/clamp/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { clamp } from 'date-fns'
+export default clamp

backend/node_modules/date-fns/clamp/index.js

@@ -0,0 +1,43 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = clamp;
+var _index = _interopRequireDefault(require("../max/index.js"));
+var _index2 = _interopRequireDefault(require("../min/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name clamp
+ * @category Interval Helpers
+ * @summary Return a date bounded by the start and the end of the given interval
+ *
+ * @description
+ * Clamps a date to the lower bound with the start of the interval and the upper
+ * bound with the end of the interval.
+ *
+ * - When the date is less than the start of the interval, the start is returned.
+ * - When the date is greater than the end of the interval, the end is returned.
+ * - Otherwise the date is returned.
+ *
+ * @example
+ * // What is Mar, 21, 2021 bounded to an interval starting at Mar, 22, 2021 and ending at Apr, 01, 2021
+ * const result = clamp(new Date(2021, 2, 21), {
+ *   start: new Date(2021, 2, 22),
+ *   end: new Date(2021, 3, 1),
+ * })
+ * //=> Mon Mar 22 2021 00:00:00
+ *
+ * @param {Date | Number} date - the date to be bounded
+ * @param {Interval} interval - the interval to bound to
+ * @returns {Date} the date bounded by the start and the end of the interval
+ * @throws {TypeError} 2 arguments required
+ */
+function clamp(date, _ref) {
+  var start = _ref.start,
+    end = _ref.end;
+  (0, _index3.default)(2, arguments);
+  return (0, _index2.default)([(0, _index.default)([date, start]), end]);
+}
+module.exports = exports.default;

backend/node_modules/date-fns/clamp/index.js.flow

@@ -0,0 +1,52 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (date: Date | number, interval: Interval) => Date

backend/node_modules/date-fns/clamp/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/clamp/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/closestIndexTo/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { closestIndexTo } from 'date-fns'
+export default closestIndexTo

backend/node_modules/date-fns/closestIndexTo/index.js

@@ -0,0 +1,69 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = closestIndexTo;
+var _index = _interopRequireDefault(require("../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name closestIndexTo
+ * @category Common Helpers
+ * @summary Return an index of the closest date from the array comparing to the given date.
+ *
+ * @description
+ * Return an index of the closest date from the array comparing to the given date.
+ *
+ * @param {Date | Number} dateToCompare - the date to compare with
+ * @param {Array<Date> | Array<number>} datesArray - the array to search
+ * @returns {Number | undefined} an index of the date closest to the given date or undefined if no valid value is given
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Which date is closer to 6 September 2015?
+ * const dateToCompare = new Date(2015, 8, 6)
+ * const datesArray = [
+ *   new Date(2015, 0, 1),
+ *   new Date(2016, 0, 1),
+ *   new Date(2017, 0, 1)
+ * ]
+ * const result = closestIndexTo(dateToCompare, datesArray)
+ * //=> 1
+ */
+function closestIndexTo(dirtyDateToCompare, dirtyDatesArray) {
+  (0, _index2.default)(2, arguments);
+  var dateToCompare = (0, _index.default)(dirtyDateToCompare);
+  if (isNaN(Number(dateToCompare))) return NaN;
+  var timeToCompare = dateToCompare.getTime();
+  var datesArray;
+  // `dirtyDatesArray` is undefined or null
+  if (dirtyDatesArray == null) {
+    datesArray = [];
+
+    // `dirtyDatesArray` is Array, Set or Map, or object with custom `forEach` method
+  } else if (typeof dirtyDatesArray.forEach === 'function') {
+    datesArray = dirtyDatesArray;
+
+    // If `dirtyDatesArray` is Array-like Object, convert to Array. Otherwise, make it empty Array
+  } else {
+    datesArray = Array.prototype.slice.call(dirtyDatesArray);
+  }
+  var result;
+  var minDistance;
+  datesArray.forEach(function (dirtyDate, index) {
+    var currentDate = (0, _index.default)(dirtyDate);
+    if (isNaN(Number(currentDate))) {
+      result = NaN;
+      minDistance = NaN;
+      return;
+    }
+    var distance = Math.abs(timeToCompare - currentDate.getTime());
+    if (result == null || distance < Number(minDistance)) {
+      result = index;
+      minDistance = distance;
+    }
+  });
+  return result;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/closestIndexTo/index.js.flow

@@ -0,0 +1,55 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (
+  dateToCompare: Date | number,
+  datesArray: (Date | number)[]
+) => ?number

backend/node_modules/date-fns/closestIndexTo/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/closestIndexTo/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/closestTo/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { closestTo } from 'date-fns'
+export default closestTo

backend/node_modules/date-fns/closestTo/index.js

@@ -0,0 +1,67 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = closestTo;
+var _index = _interopRequireDefault(require("../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name closestTo
+ * @category Common Helpers
+ * @summary Return a date from the array closest to the given date.
+ *
+ * @description
+ * Return a date from the array closest to the given date.
+ *
+ * @param {Date | Number} dateToCompare - the date to compare with
+ * @param {Array<Date> | Array<number>} datesArray - the array to search
+ * @returns {Date | undefined} the date from the array closest to the given date or undefined if no valid value is given
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Which date is closer to 6 September 2015: 1 January 2000 or 1 January 2030?
+ * const dateToCompare = new Date(2015, 8, 6)
+ * const result = closestTo(dateToCompare, [
+ *   new Date(2000, 0, 1),
+ *   new Date(2030, 0, 1)
+ * ])
+ * //=> Tue Jan 01 2030 00:00:00
+ */
+function closestTo(dirtyDateToCompare, dirtyDatesArray) {
+  (0, _index2.default)(2, arguments);
+  var dateToCompare = (0, _index.default)(dirtyDateToCompare);
+  if (isNaN(Number(dateToCompare))) return new Date(NaN);
+  var timeToCompare = dateToCompare.getTime();
+  var datesArray;
+  // `dirtyDatesArray` is undefined or null
+  if (dirtyDatesArray == null) {
+    datesArray = [];
+
+    // `dirtyDatesArray` is Array, Set or Map, or object with custom `forEach` method
+  } else if (typeof dirtyDatesArray.forEach === 'function') {
+    datesArray = dirtyDatesArray;
+
+    // If `dirtyDatesArray` is Array-like Object, convert to Array. Otherwise, make it empty Array
+  } else {
+    datesArray = Array.prototype.slice.call(dirtyDatesArray);
+  }
+  var result;
+  var minDistance;
+  datesArray.forEach(function (dirtyDate) {
+    var currentDate = (0, _index.default)(dirtyDate);
+    if (isNaN(Number(currentDate))) {
+      result = new Date(NaN);
+      minDistance = NaN;
+      return;
+    }
+    var distance = Math.abs(timeToCompare - currentDate.getTime());
+    if (result == null || distance < Number(minDistance)) {
+      result = currentDate;
+      minDistance = distance;
+    }
+  });
+  return result;
+}
+module.exports = exports.default;

backend/node_modules/date-fns/closestTo/index.js.flow

@@ -0,0 +1,55 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (
+  dateToCompare: Date | number,
+  datesArray: (Date | number)[]
+) => ?Date

backend/node_modules/date-fns/closestTo/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/closestTo/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/compareAsc/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { compareAsc } from 'date-fns'
+export default compareAsc

backend/node_modules/date-fns/compareAsc/index.js

@@ -0,0 +1,56 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = compareAsc;
+var _index = _interopRequireDefault(require("../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name compareAsc
+ * @category Common Helpers
+ * @summary Compare the two dates and return -1, 0 or 1.
+ *
+ * @description
+ * Compare the two dates and return 1 if the first date is after the second,
+ * -1 if the first date is before the second or 0 if dates are equal.
+ *
+ * @param {Date|Number} dateLeft - the first date to compare
+ * @param {Date|Number} dateRight - the second date to compare
+ * @returns {Number} the result of the comparison
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Compare 11 February 1987 and 10 July 1989:
+ * const result = compareAsc(new Date(1987, 1, 11), new Date(1989, 6, 10))
+ * //=> -1
+ *
+ * @example
+ * // Sort the array of dates:
+ * const result = [
+ *   new Date(1995, 6, 2),
+ *   new Date(1987, 1, 11),
+ *   new Date(1989, 6, 10)
+ * ].sort(compareAsc)
+ * //=> [
+ * //   Wed Feb 11 1987 00:00:00,
+ * //   Mon Jul 10 1989 00:00:00,
+ * //   Sun Jul 02 1995 00:00:00
+ * // ]
+ */
+function compareAsc(dirtyDateLeft, dirtyDateRight) {
+  (0, _index2.default)(2, arguments);
+  var dateLeft = (0, _index.default)(dirtyDateLeft);
+  var dateRight = (0, _index.default)(dirtyDateRight);
+  var diff = dateLeft.getTime() - dateRight.getTime();
+  if (diff < 0) {
+    return -1;
+  } else if (diff > 0) {
+    return 1;
+    // Return 0 if diff is 0; return NaN if diff is NaN
+  } else {
+    return diff;
+  }
+}
+module.exports = exports.default;

backend/node_modules/date-fns/compareAsc/index.js.flow

@@ -0,0 +1,55 @@
+// @flow
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+export type Interval = {
+  start: Date | number,
+  end: Date | number,
+}
+
+export type Locale = {
+  code?: string,
+  formatDistance?: (...args: Array<any>) => any,
+  formatRelative?: (...args: Array<any>) => any,
+  localize?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  formatLong?: {
+    date: (...args: Array<any>) => any,
+    time: (...args: Array<any>) => any,
+    dateTime: (...args: Array<any>) => any,
+  },
+  match?: {
+    ordinalNumber: (...args: Array<any>) => any,
+    era: (...args: Array<any>) => any,
+    quarter: (...args: Array<any>) => any,
+    month: (...args: Array<any>) => any,
+    day: (...args: Array<any>) => any,
+    dayPeriod: (...args: Array<any>) => any,
+  },
+  options?: {
+    weekStartsOn?: 0 | 1 | 2 | 3 | 4 | 5 | 6,
+    firstWeekContainsDate?: 1 | 2 | 3 | 4 | 5 | 6 | 7,
+  },
+}
+
+export type Duration = {
+  years?: number,
+  months?: number,
+  weeks?: number,
+  days?: number,
+  hours?: number,
+  minutes?: number,
+  seconds?: number,
+}
+
+export type Day = 0 | 1 | 2 | 3 | 4 | 5 | 6
+
+declare module.exports: (
+  dateLeft: Date | number,
+  dateRight: Date | number
+) => number

backend/node_modules/date-fns/compareAsc/package.json

@@ -0,0 +1,5 @@
+{
+  "sideEffects": false,
+  "module": "../esm/compareAsc/index.js",
+  "typings": "../typings.d.ts"
+}

backend/node_modules/date-fns/compareDesc/index.d.ts

@@ -0,0 +1,4 @@
+// This file is generated automatically by `scripts/build/typings.js`. Please, don't change it.
+
+import { compareDesc } from 'date-fns'
+export default compareDesc