(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.FlowbiteDatepicker = {}));
})(this, (function (exports) { 'use strict';

  function _arrayLikeToArray(r, a) {
    (null == a || a > r.length) && (a = r.length);
    for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
    return n;
  }
  function _arrayWithHoles(r) {
    if (Array.isArray(r)) return r;
  }
  function _arrayWithoutHoles(r) {
    if (Array.isArray(r)) return _arrayLikeToArray(r);
  }
  function _assertThisInitialized(e) {
    if (void 0 === e) throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
    return e;
  }
  function _callSuper(t, o, e) {
    return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e));
  }
  function _classCallCheck(a, n) {
    if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function");
  }
  function _defineProperties(e, r) {
    for (var t = 0; t < r.length; t++) {
      var o = r[t];
      o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o);
    }
  }
  function _createClass(e, r, t) {
    return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", {
      writable: !1
    }), e;
  }
  function _get() {
    return _get = "undefined" != typeof Reflect && Reflect.get ? Reflect.get.bind() : function (e, t, r) {
      var p = _superPropBase(e, t);
      if (p) {
        var n = Object.getOwnPropertyDescriptor(p, t);
        return n.get ? n.get.call(arguments.length < 3 ? e : r) : n.value;
      }
    }, _get.apply(null, arguments);
  }
  function _getPrototypeOf(t) {
    return _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function (t) {
      return t.__proto__ || Object.getPrototypeOf(t);
    }, _getPrototypeOf(t);
  }
  function _inherits(t, e) {
    if ("function" != typeof e && null !== e) throw new TypeError("Super expression must either be null or a function");
    t.prototype = Object.create(e && e.prototype, {
      constructor: {
        value: t,
        writable: !0,
        configurable: !0
      }
    }), Object.defineProperty(t, "prototype", {
      writable: !1
    }), e && _setPrototypeOf(t, e);
  }
  function _isNativeReflectConstruct() {
    try {
      var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {}));
    } catch (t) {}
    return (_isNativeReflectConstruct = function () {
      return !!t;
    })();
  }
  function _iterableToArray(r) {
    if ("undefined" != typeof Symbol && null != r[Symbol.iterator] || null != r["@@iterator"]) return Array.from(r);
  }
  function _iterableToArrayLimit(r, l) {
    var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
    if (null != t) {
      var e,
        n,
        i,
        u,
        a = [],
        f = !0,
        o = !1;
      try {
        if (i = (t = t.call(r)).next, 0 === l) {
          if (Object(t) !== t) return;
          f = !1;
        } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
      } catch (r) {
        o = !0, n = r;
      } finally {
        try {
          if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return;
        } finally {
          if (o) throw n;
        }
      }
      return a;
    }
  }
  function _nonIterableRest() {
    throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
  }
  function _nonIterableSpread() {
    throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
  }
  function _possibleConstructorReturn(t, e) {
    if (e && ("object" == typeof e || "function" == typeof e)) return e;
    if (void 0 !== e) throw new TypeError("Derived constructors may only return object or undefined");
    return _assertThisInitialized(t);
  }
  function _setPrototypeOf(t, e) {
    return _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function (t, e) {
      return t.__proto__ = e, t;
    }, _setPrototypeOf(t, e);
  }
  function _slicedToArray(r, e) {
    return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest();
  }
  function _superPropBase(t, o) {
    for (; !{}.hasOwnProperty.call(t, o) && null !== (t = _getPrototypeOf(t)););
    return t;
  }
  function _toConsumableArray(r) {
    return _arrayWithoutHoles(r) || _iterableToArray(r) || _unsupportedIterableToArray(r) || _nonIterableSpread();
  }
  function _toPrimitive(t, r) {
    if ("object" != typeof t || !t) return t;
    var e = t[Symbol.toPrimitive];
    if (void 0 !== e) {
      var i = e.call(t, r || "default");
      if ("object" != typeof i) return i;
      throw new TypeError("@@toPrimitive must return a primitive value.");
    }
    return ("string" === r ? String : Number)(t);
  }
  function _toPropertyKey(t) {
    var i = _toPrimitive(t, "string");
    return "symbol" == typeof i ? i : i + "";
  }
  function _typeof(o) {
    "@babel/helpers - typeof";

    return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
      return typeof o;
    } : function (o) {
      return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
    }, _typeof(o);
  }
  function _unsupportedIterableToArray(r, a) {
    if (r) {
      if ("string" == typeof r) return _arrayLikeToArray(r, a);
      var t = {}.toString.call(r).slice(8, -1);
      return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
    }
  }

  function hasProperty(obj, prop) {
    return Object.prototype.hasOwnProperty.call(obj, prop);
  }
  function lastItemOf(arr) {
    return arr[arr.length - 1];
  }

  // push only the items not included in the array
  function pushUnique(arr) {
    for (var _len = arguments.length, items = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      items[_key - 1] = arguments[_key];
    }
    items.forEach(function (item) {
      if (arr.includes(item)) {
        return;
      }
      arr.push(item);
    });
    return arr;
  }
  function stringToArray(str, separator) {
    // convert empty string to an empty array
    return str ? str.split(separator) : [];
  }
  function isInRange(testVal, min, max) {
    var minOK = min === undefined || testVal >= min;
    var maxOK = max === undefined || testVal <= max;
    return minOK && maxOK;
  }
  function limitToRange(val, min, max) {
    if (val < min) {
      return min;
    }
    if (val > max) {
      return max;
    }
    return val;
  }
  function createTagRepeat(tagName, repeat) {
    var attributes = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    var index = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 0;
    var html = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : '';
    var openTagSrc = Object.keys(attributes).reduce(function (src, attr) {
      var val = attributes[attr];
      if (typeof val === 'function') {
        val = val(index);
      }
      return "".concat(src, " ").concat(attr, "=\"").concat(val, "\"");
    }, tagName);
    html += "<".concat(openTagSrc, "></").concat(tagName, ">");
    var next = index + 1;
    return next < repeat ? createTagRepeat(tagName, repeat, attributes, next, html) : html;
  }

  // Remove the spacing surrounding tags for HTML parser not to create text nodes
  // before/after elements
  function optimizeTemplateHTML(html) {
    return html.replace(/>\s+/g, '>').replace(/\s+</, '<');
  }

  function stripTime(timeValue) {
    return new Date(timeValue).setHours(0, 0, 0, 0);
  }
  function today() {
    return new Date().setHours(0, 0, 0, 0);
  }

  // Get the time value of the start of given date or year, month and day
  function dateValue() {
    switch (arguments.length) {
      case 0:
        return today();
      case 1:
        return stripTime(arguments.length <= 0 ? undefined : arguments[0]);
    }

    // use setFullYear() to keep 2-digit year from being mapped to 1900-1999
    var newDate = new Date(0);
    newDate.setFullYear.apply(newDate, arguments);
    return newDate.setHours(0, 0, 0, 0);
  }
  function addDays(date, amount) {
    var newDate = new Date(date);
    return newDate.setDate(newDate.getDate() + amount);
  }
  function addWeeks(date, amount) {
    return addDays(date, amount * 7);
  }
  function addMonths(date, amount) {
    // If the day of the date is not in the new month, the last day of the new
    // month will be returned. e.g. Jan 31 + 1 month → Feb 28 (not Mar 03)
    var newDate = new Date(date);
    var monthsToSet = newDate.getMonth() + amount;
    var expectedMonth = monthsToSet % 12;
    if (expectedMonth < 0) {
      expectedMonth += 12;
    }
    var time = newDate.setMonth(monthsToSet);
    return newDate.getMonth() !== expectedMonth ? newDate.setDate(0) : time;
  }
  function addYears(date, amount) {
    // If the date is Feb 29 and the new year is not a leap year, Feb 28 of the
    // new year will be returned.
    var newDate = new Date(date);
    var expectedMonth = newDate.getMonth();
    var time = newDate.setFullYear(newDate.getFullYear() + amount);
    return expectedMonth === 1 && newDate.getMonth() === 2 ? newDate.setDate(0) : time;
  }

  // Calculate the distance bettwen 2 days of the week
  function dayDiff(day, from) {
    return (day - from + 7) % 7;
  }

  // Get the date of the specified day of the week of given base date
  function dayOfTheWeekOf(baseDate, dayOfWeek) {
    var weekStart = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
    var baseDay = new Date(baseDate).getDay();
    return addDays(baseDate, dayDiff(dayOfWeek, weekStart) - dayDiff(baseDay, weekStart));
  }

  // Get the ISO week of a date
  function getWeek(date) {
    // start of ISO week is Monday
    var thuOfTheWeek = dayOfTheWeekOf(date, 4, 1);
    // 1st week == the week where the 4th of January is in
    var firstThu = dayOfTheWeekOf(new Date(thuOfTheWeek).setMonth(0, 4), 4, 1);
    return Math.round((thuOfTheWeek - firstThu) / 604800000) + 1;
  }

  // Get the start year of the period of years that includes given date
  // years: length of the year period
  function startOfYearPeriod(date, years) {
    /* @see https://en.wikipedia.org/wiki/Year_zero#ISO_8601 */
    var year = new Date(date).getFullYear();
    return Math.floor(year / years) * years;
  }

  // pattern for format parts
  var reFormatTokens = /dd?|DD?|mm?|MM?|yy?(?:yy)?/;
  // pattern for non date parts
  var reNonDateParts = /[\s!-/:-@[-`{-~年月日]+/;
  // cache for persed formats
  var knownFormats = {};
  // parse funtions for date parts
  var parseFns = {
    y: function y(date, year) {
      return new Date(date).setFullYear(parseInt(year, 10));
    },
    m: function m(date, month, locale) {
      var newDate = new Date(date);
      var monthIndex = parseInt(month, 10) - 1;
      if (isNaN(monthIndex)) {
        if (!month) {
          return NaN;
        }
        var monthName = month.toLowerCase();
        var compareNames = function compareNames(name) {
          return name.toLowerCase().startsWith(monthName);
        };
        // compare with both short and full names because some locales have periods
        // in the short names (not equal to the first X letters of the full names)
        monthIndex = locale.monthsShort.findIndex(compareNames);
        if (monthIndex < 0) {
          monthIndex = locale.months.findIndex(compareNames);
        }
        if (monthIndex < 0) {
          return NaN;
        }
      }
      newDate.setMonth(monthIndex);
      return newDate.getMonth() !== normalizeMonth(monthIndex) ? newDate.setDate(0) : newDate.getTime();
    },
    d: function d(date, day) {
      return new Date(date).setDate(parseInt(day, 10));
    }
  };
  // format functions for date parts
  var formatFns = {
    d: function d(date) {
      return date.getDate();
    },
    dd: function dd(date) {
      return padZero(date.getDate(), 2);
    },
    D: function D(date, locale) {
      return locale.daysShort[date.getDay()];
    },
    DD: function DD(date, locale) {
      return locale.days[date.getDay()];
    },
    m: function m(date) {
      return date.getMonth() + 1;
    },
    mm: function mm(date) {
      return padZero(date.getMonth() + 1, 2);
    },
    M: function M(date, locale) {
      return locale.monthsShort[date.getMonth()];
    },
    MM: function MM(date, locale) {
      return locale.months[date.getMonth()];
    },
    y: function y(date) {
      return date.getFullYear();
    },
    yy: function yy(date) {
      return padZero(date.getFullYear(), 2).slice(-2);
    },
    yyyy: function yyyy(date) {
      return padZero(date.getFullYear(), 4);
    }
  };

  // get month index in normal range (0 - 11) from any number
  function normalizeMonth(monthIndex) {
    return monthIndex > -1 ? monthIndex % 12 : normalizeMonth(monthIndex + 12);
  }
  function padZero(num, length) {
    return num.toString().padStart(length, '0');
  }
  function parseFormatString(format) {
    if (typeof format !== 'string') {
      throw new Error("Invalid date format.");
    }
    if (format in knownFormats) {
      return knownFormats[format];
    }

    // sprit the format string into parts and seprators
    var separators = format.split(reFormatTokens);
    var parts = format.match(new RegExp(reFormatTokens, 'g'));
    if (separators.length === 0 || !parts) {
      throw new Error("Invalid date format.");
    }

    // collect format functions used in the format
    var partFormatters = parts.map(function (token) {
      return formatFns[token];
    });

    // collect parse function keys used in the format
    // iterate over parseFns' keys in order to keep the order of the keys.
    var partParserKeys = Object.keys(parseFns).reduce(function (keys, key) {
      var token = parts.find(function (part) {
        return part[0] !== 'D' && part[0].toLowerCase() === key;
      });
      if (token) {
        keys.push(key);
      }
      return keys;
    }, []);
    return knownFormats[format] = {
      parser: function parser(dateStr, locale) {
        var dateParts = dateStr.split(reNonDateParts).reduce(function (dtParts, part, index) {
          if (part.length > 0 && parts[index]) {
            var token = parts[index][0];
            if (token === 'M') {
              dtParts.m = part;
            } else if (token !== 'D') {
              dtParts[token] = part;
            }
          }
          return dtParts;
        }, {});

        // iterate over partParserkeys so that the parsing is made in the oder
        // of year, month and day to prevent the day parser from correcting last
        // day of month wrongly
        return partParserKeys.reduce(function (origDate, key) {
          var newDate = parseFns[key](origDate, dateParts[key], locale);
          // ingnore the part failed to parse
          return isNaN(newDate) ? origDate : newDate;
        }, today());
      },
      formatter: function formatter(date, locale) {
        var dateStr = partFormatters.reduce(function (str, fn, index) {
          return str += "".concat(separators[index]).concat(fn(date, locale));
        }, '');
        // separators' length is always parts' length + 1,
        return dateStr += lastItemOf(separators);
      }
    };
  }
  function parseDate(dateStr, format, locale) {
    if (dateStr instanceof Date || typeof dateStr === 'number') {
      var date = stripTime(dateStr);
      return isNaN(date) ? undefined : date;
    }
    if (!dateStr) {
      return undefined;
    }
    if (dateStr === 'today') {
      return today();
    }
    if (format && format.toValue) {
      var _date = format.toValue(dateStr, format, locale);
      return isNaN(_date) ? undefined : stripTime(_date);
    }
    return parseFormatString(format).parser(dateStr, locale);
  }
  function formatDate(date, format, locale) {
    if (isNaN(date) || !date && date !== 0) {
      return '';
    }
    var dateObj = typeof date === 'number' ? new Date(date) : date;
    if (format.toDisplay) {
      return format.toDisplay(dateObj, format, locale);
    }
    return parseFormatString(format).formatter(dateObj, locale);
  }

  var listenerRegistry = new WeakMap();
  var _EventTarget$prototyp = EventTarget.prototype,
    addEventListener = _EventTarget$prototyp.addEventListener,
    removeEventListener = _EventTarget$prototyp.removeEventListener;

  // Register event listeners to a key object
  // listeners: array of listener definitions;
  //   - each definition must be a flat array of event target and the arguments
  //     used to call addEventListener() on the target
  function registerListeners(keyObj, listeners) {
    var registered = listenerRegistry.get(keyObj);
    if (!registered) {
      registered = [];
      listenerRegistry.set(keyObj, registered);
    }
    listeners.forEach(function (listener) {
      addEventListener.call.apply(addEventListener, _toConsumableArray(listener));
      registered.push(listener);
    });
  }
  function unregisterListeners(keyObj) {
    var listeners = listenerRegistry.get(keyObj);
    if (!listeners) {
      return;
    }
    listeners.forEach(function (listener) {
      removeEventListener.call.apply(removeEventListener, _toConsumableArray(listener));
    });
    listenerRegistry["delete"](keyObj);
  }

  // Event.composedPath() polyfill for Edge
  // based on https://gist.github.com/kleinfreund/e9787d73776c0e3750dcfcdc89f100ec
  if (!Event.prototype.composedPath) {
    var getComposedPath = function getComposedPath(node) {
      var path = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
      path.push(node);
      var parent;
      if (node.parentNode) {
        parent = node.parentNode;
      } else if (node.host) {
        // ShadowRoot
        parent = node.host;
      } else if (node.defaultView) {
        // Document
        parent = node.defaultView;
      }
      return parent ? getComposedPath(parent, path) : path;
    };
    Event.prototype.composedPath = function () {
      return getComposedPath(this.target);
    };
  }
  function findFromPath(path, criteria, currentTarget) {
    var index = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 0;
    var el = path[index];
    if (criteria(el)) {
      return el;
    } else if (el === currentTarget || !el.parentElement) {
      // stop when reaching currentTarget or <html>
      return;
    }
    return findFromPath(path, criteria, currentTarget, index + 1);
  }

  // Search for the actual target of a delegated event
  function findElementInEventPath(ev, selector) {
    var criteria = typeof selector === 'function' ? selector : function (el) {
      return el.matches(selector);
    };
    return findFromPath(ev.composedPath(), criteria, ev.currentTarget);
  }

  // default locales
  var locales = {
    en: {
      days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
      daysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
      daysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"],
      months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
      monthsShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
      today: "Today",
      clear: "Clear",
      titleFormat: "MM y"
    }
  };

  // config options updatable by setOptions() and their default values
  var defaultOptions = {
    autohide: false,
    beforeShowDay: null,
    beforeShowDecade: null,
    beforeShowMonth: null,
    beforeShowYear: null,
    calendarWeeks: false,
    clearBtn: false,
    dateDelimiter: ',',
    datesDisabled: [],
    daysOfWeekDisabled: [],
    daysOfWeekHighlighted: [],
    defaultViewDate: undefined,
    // placeholder, defaults to today() by the program
    disableTouchKeyboard: false,
    format: 'mm/dd/yyyy',
    language: 'en',
    maxDate: null,
    maxNumberOfDates: 1,
    maxView: 3,
    minDate: null,
    nextArrow: '<svg class="w-4 h-4 rtl:rotate-180" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 14 10"><path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M1 5h12m0 0L9 1m4 4L9 9"/></svg>',
    orientation: 'auto',
    pickLevel: 0,
    prevArrow: '<svg class="w-4 h-4 rtl:rotate-180" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 14 10"><path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 5H1m0 0 4 4M1 5l4-4"/></svg>',
    showDaysOfWeek: true,
    showOnClick: true,
    showOnFocus: true,
    startView: 0,
    title: '',
    todayBtn: false,
    todayBtnMode: 0,
    todayHighlight: false,
    updateOnBlur: true,
    weekStart: 0
  };

  var range = null;
  function parseHTML(html) {
    if (range == null) {
      range = document.createRange();
    }
    return range.createContextualFragment(html);
  }
  function hideElement(el) {
    if (el.style.display === 'none') {
      return;
    }
    // back up the existing display setting in data-style-display
    if (el.style.display) {
      el.dataset.styleDisplay = el.style.display;
    }
    el.style.display = 'none';
  }
  function showElement(el) {
    if (el.style.display !== 'none') {
      return;
    }
    if (el.dataset.styleDisplay) {
      // restore backed-up dispay property
      el.style.display = el.dataset.styleDisplay;
      delete el.dataset.styleDisplay;
    } else {
      el.style.display = '';
    }
  }
  function emptyChildNodes(el) {
    if (el.firstChild) {
      el.removeChild(el.firstChild);
      emptyChildNodes(el);
    }
  }
  function replaceChildNodes(el, newChildNodes) {
    emptyChildNodes(el);
    if (newChildNodes instanceof DocumentFragment) {
      el.appendChild(newChildNodes);
    } else if (typeof newChildNodes === 'string') {
      el.appendChild(parseHTML(newChildNodes));
    } else if (typeof newChildNodes.forEach === 'function') {
      newChildNodes.forEach(function (node) {
        el.appendChild(node);
      });
    }
  }

  var defaultLang = defaultOptions.language,
    defaultFormat = defaultOptions.format,
    defaultWeekStart = defaultOptions.weekStart;

  // Reducer function to filter out invalid day-of-week from the input
  function sanitizeDOW(dow, day) {
    return dow.length < 6 && day >= 0 && day < 7 ? pushUnique(dow, day) : dow;
  }
  function calcEndOfWeek(startOfWeek) {
    return (startOfWeek + 6) % 7;
  }

  // validate input date. if invalid, fallback to the original value
  function validateDate(value, format, locale, origValue) {
    var date = parseDate(value, format, locale);
    return date !== undefined ? date : origValue;
  }

  // Validate viewId. if invalid, fallback to the original value
  function validateViewId(value, origValue) {
    var max = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 3;
    var viewId = parseInt(value, 10);
    return viewId >= 0 && viewId <= max ? viewId : origValue;
  }

  // Create Datepicker configuration to set
  function processOptions(options, datepicker) {
    var inOpts = Object.assign({}, options);
    var config = {};
    var locales = datepicker.constructor.locales;
    var _ref = datepicker.config || {},
      format = _ref.format,
      language = _ref.language,
      locale = _ref.locale,
      maxDate = _ref.maxDate,
      maxView = _ref.maxView,
      minDate = _ref.minDate,
      pickLevel = _ref.pickLevel,
      startView = _ref.startView,
      weekStart = _ref.weekStart;
    if (inOpts.language) {
      var lang;
      if (inOpts.language !== language) {
        if (locales[inOpts.language]) {
          lang = inOpts.language;
        } else {
          // Check if langauge + region tag can fallback to the one without
          // region (e.g. fr-CA → fr)
          lang = inOpts.language.split('-')[0];
          if (locales[lang] === undefined) {
            lang = false;
          }
        }
      }
      delete inOpts.language;
      if (lang) {
        language = config.language = lang;

        // update locale as well when updating language
        var origLocale = locale || locales[defaultLang];
        // use default language's properties for the fallback
        locale = Object.assign({
          format: defaultFormat,
          weekStart: defaultWeekStart
        }, locales[defaultLang]);
        if (language !== defaultLang) {
          Object.assign(locale, locales[language]);
        }
        config.locale = locale;
        // if format and/or weekStart are the same as old locale's defaults,
        // update them to new locale's defaults
        if (format === origLocale.format) {
          format = config.format = locale.format;
        }
        if (weekStart === origLocale.weekStart) {
          weekStart = config.weekStart = locale.weekStart;
          config.weekEnd = calcEndOfWeek(locale.weekStart);
        }
      }
    }
    if (inOpts.format) {
      var hasToDisplay = typeof inOpts.format.toDisplay === 'function';
      var hasToValue = typeof inOpts.format.toValue === 'function';
      var validFormatString = reFormatTokens.test(inOpts.format);
      if (hasToDisplay && hasToValue || validFormatString) {
        format = config.format = inOpts.format;
      }
      delete inOpts.format;
    }

    //*** dates ***//
    // while min and maxDate for "no limit" in the options are better to be null
    // (especially when updating), the ones in the config have to be undefined
    // because null is treated as 0 (= unix epoch) when comparing with time value
    var minDt = minDate;
    var maxDt = maxDate;
    if (inOpts.minDate !== undefined) {
      minDt = inOpts.minDate === null ? dateValue(0, 0, 1) // set 0000-01-01 to prevent negative values for year
      : validateDate(inOpts.minDate, format, locale, minDt);
      delete inOpts.minDate;
    }
    if (inOpts.maxDate !== undefined) {
      maxDt = inOpts.maxDate === null ? undefined : validateDate(inOpts.maxDate, format, locale, maxDt);
      delete inOpts.maxDate;
    }
    if (maxDt < minDt) {
      minDate = config.minDate = maxDt;
      maxDate = config.maxDate = minDt;
    } else {
      if (minDate !== minDt) {
        minDate = config.minDate = minDt;
      }
      if (maxDate !== maxDt) {
        maxDate = config.maxDate = maxDt;
      }
    }
    if (inOpts.datesDisabled) {
      config.datesDisabled = inOpts.datesDisabled.reduce(function (dates, dt) {
        var date = parseDate(dt, format, locale);
        return date !== undefined ? pushUnique(dates, date) : dates;
      }, []);
      delete inOpts.datesDisabled;
    }
    if (inOpts.defaultViewDate !== undefined) {
      var viewDate = parseDate(inOpts.defaultViewDate, format, locale);
      if (viewDate !== undefined) {
        config.defaultViewDate = viewDate;
      }
      delete inOpts.defaultViewDate;
    }

    //*** days of week ***//
    if (inOpts.weekStart !== undefined) {
      var wkStart = Number(inOpts.weekStart) % 7;
      if (!isNaN(wkStart)) {
        weekStart = config.weekStart = wkStart;
        config.weekEnd = calcEndOfWeek(wkStart);
      }
      delete inOpts.weekStart;
    }
    if (inOpts.daysOfWeekDisabled) {
      config.daysOfWeekDisabled = inOpts.daysOfWeekDisabled.reduce(sanitizeDOW, []);
      delete inOpts.daysOfWeekDisabled;
    }
    if (inOpts.daysOfWeekHighlighted) {
      config.daysOfWeekHighlighted = inOpts.daysOfWeekHighlighted.reduce(sanitizeDOW, []);
      delete inOpts.daysOfWeekHighlighted;
    }

    //*** multi date ***//
    if (inOpts.maxNumberOfDates !== undefined) {
      var maxNumberOfDates = parseInt(inOpts.maxNumberOfDates, 10);
      if (maxNumberOfDates >= 0) {
        config.maxNumberOfDates = maxNumberOfDates;
        config.multidate = maxNumberOfDates !== 1;
      }
      delete inOpts.maxNumberOfDates;
    }
    if (inOpts.dateDelimiter) {
      config.dateDelimiter = String(inOpts.dateDelimiter);
      delete inOpts.dateDelimiter;
    }

    //*** pick level & view ***//
    var newPickLevel = pickLevel;
    if (inOpts.pickLevel !== undefined) {
      newPickLevel = validateViewId(inOpts.pickLevel, 2);
      delete inOpts.pickLevel;
    }
    if (newPickLevel !== pickLevel) {
      pickLevel = config.pickLevel = newPickLevel;
    }
    var newMaxView = maxView;
    if (inOpts.maxView !== undefined) {
      newMaxView = validateViewId(inOpts.maxView, maxView);
      delete inOpts.maxView;
    }
    // ensure max view >= pick level
    newMaxView = pickLevel > newMaxView ? pickLevel : newMaxView;
    if (newMaxView !== maxView) {
      maxView = config.maxView = newMaxView;
    }
    var newStartView = startView;
    if (inOpts.startView !== undefined) {
      newStartView = validateViewId(inOpts.startView, newStartView);
      delete inOpts.startView;
    }
    // ensure pick level <= start view <= max view
    if (newStartView < pickLevel) {
      newStartView = pickLevel;
    } else if (newStartView > maxView) {
      newStartView = maxView;
    }
    if (newStartView !== startView) {
      config.startView = newStartView;
    }

    //*** template ***//
    if (inOpts.prevArrow) {
      var prevArrow = parseHTML(inOpts.prevArrow);
      if (prevArrow.childNodes.length > 0) {
        config.prevArrow = prevArrow.childNodes;
      }
      delete inOpts.prevArrow;
    }
    if (inOpts.nextArrow) {
      var nextArrow = parseHTML(inOpts.nextArrow);
      if (nextArrow.childNodes.length > 0) {
        config.nextArrow = nextArrow.childNodes;
      }
      delete inOpts.nextArrow;
    }

    //*** misc ***//
    if (inOpts.disableTouchKeyboard !== undefined) {
      config.disableTouchKeyboard = 'ontouchstart' in document && !!inOpts.disableTouchKeyboard;
      delete inOpts.disableTouchKeyboard;
    }
    if (inOpts.orientation) {
      var orientation = inOpts.orientation.toLowerCase().split(/\s+/g);
      config.orientation = {
        x: orientation.find(function (x) {
          return x === 'left' || x === 'right';
        }) || 'auto',
        y: orientation.find(function (y) {
          return y === 'top' || y === 'bottom';
        }) || 'auto'
      };
      delete inOpts.orientation;
    }
    if (inOpts.todayBtnMode !== undefined) {
      switch (inOpts.todayBtnMode) {
        case 0:
        case 1:
          config.todayBtnMode = inOpts.todayBtnMode;
      }
      delete inOpts.todayBtnMode;
    }

    //*** copy the rest ***//
    Object.keys(inOpts).forEach(function (key) {
      if (inOpts[key] !== undefined && hasProperty(defaultOptions, key)) {
        config[key] = inOpts[key];
      }
    });
    return config;
  }

  var pickerTemplate = optimizeTemplateHTML("<div class=\"datepicker hidden\">\n  <div class=\"datepicker-picker inline-block rounded-base bg-neutral-primary-medium border border-default-medium p-4\">\n    <div class=\"datepicker-header\">\n      <div class=\"datepicker-title bg-neutral-primary-medium text-heading px-2 py-3 text-center font-medium\"></div>\n      <div class=\"datepicker-controls flex justify-between mb-2\">\n        <button type=\"button\" class=\"bg-neutral-primary-medium rounded-base text-body hover:bg-neutral-tertiary-medium hover:text-heading text-lg p-2.5 focus:outline-none focus:ring-2 focus:ring-neutral-tertiary prev-btn\"></button>\n        <button type=\"button\" class=\"text-sm rounded-base text-heading bg-neutral-primary-medium font-medium py-2.5 px-5 hover:bg-neutral-tertiary-medium focus:outline-none focus:ring-2 focus:ring-neutral-tertiary view-switch\"></button>\n        <button type=\"button\" class=\"bg-neutral-primary-medium rounded-base text-body hover:bg-neutral-tertiary-medium hover:text-heading text-lg p-2.5 focus:outline-none focus:ring-2 focus:ring-neutral-tertiary next-btn\"></button>\n      </div>\n    </div>\n    <div class=\"datepicker-main p-1\"></div>\n    <div class=\"datepicker-footer\">\n      <div class=\"datepicker-controls flex space-x-2 rtl:space-x-reverse mt-2\">\n        <button type=\"button\" class=\"%buttonClass% today-btn text-white bg-brand hover:bg-brand-strong focus:ring-4 focus:ring-brand-medium font-medium rounded-base text-sm px-5 py-2 text-center w-1/2\"></button>\n        <button type=\"button\" class=\"%buttonClass% clear-btn text-body bg-neutral-secondary-medium border border-default-medium hover:bg-neutral-tertiary-medium focus:ring-4 focus:ring-neutral-tertiary font-medium rounded-base text-sm px-5 py-2 text-center w-1/2\"></button>\n      </div>\n    </div>\n  </div>\n</div>");

  var daysTemplate = optimizeTemplateHTML("<div class=\"days\">\n  <div class=\"days-of-week grid grid-cols-7 mb-1\">".concat(createTagRepeat('span', 7, {
    "class": 'dow block flex-1 leading-9 border-0 rounded-base cursor-default text-center text-body font-medium text-sm'
  }), "</div>\n  <div class=\"datepicker-grid w-64 grid grid-cols-7\">").concat(createTagRepeat('span', 42, {
    "class": 'block flex-1 leading-9 border-0 rounded-base cursor-default text-center text-body font-medium text-sm h-6 leading-6 text-sm font-medium text-fg-disabled'
  }), "</div>\n</div>"));

  var calendarWeeksTemplate = optimizeTemplateHTML("<div class=\"calendar-weeks\">\n  <div class=\"days-of-week flex\"><span class=\"dow h-6 leading-6 text-sm font-medium text-fg-disabled\"></span></div>\n  <div class=\"weeks\">".concat(createTagRepeat('span', 6, {
    "class": 'week block flex-1 leading-9 border-0 rounded-base cursor-default text-center text-body font-medium text-sm'
  }), "</div>\n</div>"));

  // Base class of the view classes
  var View = /*#__PURE__*/function () {
    function View(picker, config) {
      _classCallCheck(this, View);
      Object.assign(this, config, {
        picker: picker,
        element: parseHTML("<div class=\"datepicker-view flex\"></div>").firstChild,
        selected: []
      });
      this.init(this.picker.datepicker.config);
    }
    return _createClass(View, [{
      key: "init",
      value: function init(options) {
        if (options.pickLevel !== undefined) {
          this.isMinView = this.id === options.pickLevel;
        }
        this.setOptions(options);
        this.updateFocus();
        this.updateSelection();
      }

      // Execute beforeShow() callback and apply the result to the element
      // args:
      // - current - current value on the iteration on view rendering
      // - timeValue - time value of the date to pass to beforeShow()
    }, {
      key: "performBeforeHook",
      value: function performBeforeHook(el, current, timeValue) {
        var result = this.beforeShow(new Date(timeValue));
        switch (_typeof(result)) {
          case 'boolean':
            result = {
              enabled: result
            };
            break;
          case 'string':
            result = {
              classes: result
            };
        }
        if (result) {
          if (result.enabled === false) {
            el.classList.add('disabled');
            pushUnique(this.disabled, current);
          }
          if (result.classes) {
            var _el$classList;
            var extraClasses = result.classes.split(/\s+/);
            (_el$classList = el.classList).add.apply(_el$classList, _toConsumableArray(extraClasses));
            if (extraClasses.includes('disabled')) {
              pushUnique(this.disabled, current);
            }
          }
          if (result.content) {
            replaceChildNodes(el, result.content);
          }
        }
      }
    }]);
  }();

  var DaysView = /*#__PURE__*/function (_View) {
    function DaysView(picker) {
      _classCallCheck(this, DaysView);
      return _callSuper(this, DaysView, [picker, {
        id: 0,
        name: 'days',
        cellClass: 'day'
      }]);
    }
    _inherits(DaysView, _View);
    return _createClass(DaysView, [{
      key: "init",
      value: function init(options) {
        var onConstruction = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
        if (onConstruction) {
          var inner = parseHTML(daysTemplate).firstChild;
          this.dow = inner.firstChild;
          this.grid = inner.lastChild;
          this.element.appendChild(inner);
        }
        _get(_getPrototypeOf(DaysView.prototype), "init", this).call(this, options);
      }
    }, {
      key: "setOptions",
      value: function setOptions(options) {
        var _this = this;
        var updateDOW;
        if (hasProperty(options, 'minDate')) {
          this.minDate = options.minDate;
        }
        if (hasProperty(options, 'maxDate')) {
          this.maxDate = options.maxDate;
        }
        if (options.datesDisabled) {
          this.datesDisabled = options.datesDisabled;
        }
        if (options.daysOfWeekDisabled) {
          this.daysOfWeekDisabled = options.daysOfWeekDisabled;
          updateDOW = true;
        }
        if (options.daysOfWeekHighlighted) {
          this.daysOfWeekHighlighted = options.daysOfWeekHighlighted;
        }
        if (options.todayHighlight !== undefined) {
          this.todayHighlight = options.todayHighlight;
        }
        if (options.weekStart !== undefined) {
          this.weekStart = options.weekStart;
          this.weekEnd = options.weekEnd;
          updateDOW = true;
        }
        if (options.locale) {
          var locale = this.locale = options.locale;
          this.dayNames = locale.daysMin;
          this.switchLabelFormat = locale.titleFormat;
          updateDOW = true;
        }
        if (options.beforeShowDay !== undefined) {
          this.beforeShow = typeof options.beforeShowDay === 'function' ? options.beforeShowDay : undefined;
        }
        if (options.calendarWeeks !== undefined) {
          if (options.calendarWeeks && !this.calendarWeeks) {
            var weeksElem = parseHTML(calendarWeeksTemplate).firstChild;
            this.calendarWeeks = {
              element: weeksElem,
              dow: weeksElem.firstChild,
              weeks: weeksElem.lastChild
            };
            this.element.insertBefore(weeksElem, this.element.firstChild);
          } else if (this.calendarWeeks && !options.calendarWeeks) {
            this.element.removeChild(this.calendarWeeks.element);
            this.calendarWeeks = null;
          }
        }
        if (options.showDaysOfWeek !== undefined) {
          if (options.showDaysOfWeek) {
            showElement(this.dow);
            if (this.calendarWeeks) {
              showElement(this.calendarWeeks.dow);
            }
          } else {
            hideElement(this.dow);
            if (this.calendarWeeks) {
              hideElement(this.calendarWeeks.dow);
            }
          }
        }

        // update days-of-week when locale, daysOfweekDisabled or weekStart is changed
        if (updateDOW) {
          Array.from(this.dow.children).forEach(function (el, index) {
            var dow = (_this.weekStart + index) % 7;
            el.textContent = _this.dayNames[dow];
            el.className = _this.daysOfWeekDisabled.includes(dow) ? 'dow disabled text-center h-6 leading-6 text-sm font-medium text-fg-disabled cursor-not-allowed' : 'dow text-center h-6 leading-6 text-sm font-medium text-body';
          });
        }
      }

      // Apply update on the focused date to view's settings
    }, {
      key: "updateFocus",
      value: function updateFocus() {
        var viewDate = new Date(this.picker.viewDate);
        var viewYear = viewDate.getFullYear();
        var viewMonth = viewDate.getMonth();
        var firstOfMonth = dateValue(viewYear, viewMonth, 1);
        var start = dayOfTheWeekOf(firstOfMonth, this.weekStart, this.weekStart);
        this.first = firstOfMonth;
        this.last = dateValue(viewYear, viewMonth + 1, 0);
        this.start = start;
        this.focused = this.picker.viewDate;
      }

      // Apply update on the selected dates to view's settings
    }, {
      key: "updateSelection",
      value: function updateSelection() {
        var _this$picker$datepick = this.picker.datepicker,
          dates = _this$picker$datepick.dates,
          rangepicker = _this$picker$datepick.rangepicker;
        this.selected = dates;
        if (rangepicker) {
          this.range = rangepicker.dates;
        }
      }

      // Update the entire view UI
    }, {
      key: "render",
      value: function render() {
        var _this2 = this;
        // update today marker on ever render
        this.today = this.todayHighlight ? today() : undefined;
        // refresh disabled dates on every render in order to clear the ones added
        // by beforeShow hook at previous render
        this.disabled = _toConsumableArray(this.datesDisabled);
        var switchLabel = formatDate(this.focused, this.switchLabelFormat, this.locale);
        this.picker.setViewSwitchLabel(switchLabel);
        this.picker.setPrevBtnDisabled(this.first <= this.minDate);
        this.picker.setNextBtnDisabled(this.last >= this.maxDate);
        if (this.calendarWeeks) {
          // start of the UTC week (Monday) of the 1st of the month
          var startOfWeek = dayOfTheWeekOf(this.first, 1, 1);
          Array.from(this.calendarWeeks.weeks.children).forEach(function (el, index) {
            el.textContent = getWeek(addWeeks(startOfWeek, index));
          });
        }
        Array.from(this.grid.children).forEach(function (el, index) {
          var classList = el.classList;
          var current = addDays(_this2.start, index);
          var date = new Date(current);
          var day = date.getDay();
          el.className = "datepicker-cell hover:bg-neutral-tertiary-medium block flex-1 leading-9 border-0 rounded-base cursor-pointer text-center text-body font-medium text-sm ".concat(_this2.cellClass);
          el.dataset.date = current;
          el.textContent = date.getDate();
          if (current < _this2.first) {
            classList.add('prev', 'text-fg-disabled');
          } else if (current > _this2.last) {
            classList.add('next', 'text-fg-disabled');
          }
          if (_this2.today === current) {
            classList.add('today', 'bg-gray-100', 'dark:bg-gray-600');
          }
          if (current < _this2.minDate || current > _this2.maxDate || _this2.disabled.includes(current)) {
            classList.add('disabled', 'cursor-not-allowed', 'text-fg-disabled');
            classList.remove('hover:bg-neutral-tertiary-medium', 'text-body', 'cursor-pointer');
          }
          if (_this2.daysOfWeekDisabled.includes(day)) {
            classList.add('disabled', 'cursor-not-allowed', 'text-fg-disabled');
            classList.remove('hover:bg-neutral-tertiary-medium', 'text-body', 'cursor-pointer');
            pushUnique(_this2.disabled, current);
          }
          if (_this2.daysOfWeekHighlighted.includes(day)) {
            classList.add('highlighted');
          }
          if (_this2.range) {
            var _this2$range = _slicedToArray(_this2.range, 2),
              rangeStart = _this2$range[0],
              rangeEnd = _this2$range[1];
            if (current > rangeStart && current < rangeEnd) {
              classList.add('range', 'bg-neutral-tertiary-medium');
              classList.remove('rounded-base', 'rounded-s-base', 'rounded-e-base');
            }
            if (current === rangeStart) {
              classList.add('range-start', 'bg-brand', 'rounded-s-base');
              classList.remove('rounded-base', 'rounded-e-base');
            }
            if (current === rangeEnd) {
              classList.add('range-end', 'bg-neutral-tertiary-medium', 'rounded-e-base');
              classList.remove('rounded-base', 'rounded-s-base');
            }
          }
          if (_this2.selected.includes(current)) {
            classList.add('selected', 'bg-brand', 'text-white');
            classList.remove('text-body', 'hover:bg-neutral-tertiary-medium', 'bg-neutral-tertiary-medium');
          }
          if (current === _this2.focused) {
            classList.add('focused');
          }
          if (_this2.beforeShow) {
            _this2.performBeforeHook(el, current, current);
          }
        });
      }

      // Update the view UI by applying the changes of selected and focused items
    }, {
      key: "refresh",
      value: function refresh() {
        var _this3 = this;
        var _ref = this.range || [],
          _ref2 = _slicedToArray(_ref, 2),
          rangeStart = _ref2[0],
          rangeEnd = _ref2[1];
        this.grid.querySelectorAll('.range, .range-start, .range-end, .selected, .focused').forEach(function (el) {
          el.classList.remove('range', 'range-start', 'range-end', 'selected', 'bg-brand', 'text-white', 'focused');
          el.classList.add('text-body', 'rounded-base');
        });
        Array.from(this.grid.children).forEach(function (el) {
          var current = Number(el.dataset.date);
          var classList = el.classList;
          classList.remove('bg-neutral-tertiary-medium', 'rounded-s-base', 'rounded-e-base');
          if (current > rangeStart && current < rangeEnd) {
            classList.add('range', 'bg-neutral-tertiary-medium');
            classList.remove('rounded-base');
          }
          if (current === rangeStart) {
            classList.add('range-start', 'bg-brand', 'text-white', 'rounded-s-base');
            classList.remove('rounded-base');
          }
          if (current === rangeEnd) {
            classList.add('range-end', 'bg-neutral-tertiary-medium', 'rounded-e-base');
            classList.remove('rounded-base');
          }
          if (_this3.selected.includes(current)) {
            classList.add('selected', 'bg-brand', 'text-white');
            classList.remove('text-body', 'hover:bg-neutral-tertiary-medium', 'bg-neutral-tertiary-medium');
          }
          if (current === _this3.focused) {
            classList.add('focused');
          }
        });
      }

      // Update the view UI by applying the change of focused item
    }, {
      key: "refreshFocus",
      value: function refreshFocus() {
        var index = Math.round((this.focused - this.start) / 86400000);
        this.grid.querySelectorAll('.focused').forEach(function (el) {
          el.classList.remove('focused');
        });
        this.grid.children[index].classList.add('focused');
      }
    }]);
  }(View);

  function computeMonthRange(range, thisYear) {
    if (!range || !range[0] || !range[1]) {
      return;
    }
    var _range = _slicedToArray(range, 2),
      _range$ = _slicedToArray(_range[0], 2),
      startY = _range$[0],
      startM = _range$[1],
      _range$2 = _slicedToArray(_range[1], 2),
      endY = _range$2[0],
      endM = _range$2[1];
    if (startY > thisYear || endY < thisYear) {
      return;
    }
    return [startY === thisYear ? startM : -1, endY === thisYear ? endM : 12];
  }
  var MonthsView = /*#__PURE__*/function (_View) {
    function MonthsView(picker) {
      _classCallCheck(this, MonthsView);
      return _callSuper(this, MonthsView, [picker, {
        id: 1,
        name: 'months',
        cellClass: 'month'
      }]);
    }
    _inherits(MonthsView, _View);
    return _createClass(MonthsView, [{
      key: "init",
      value: function init(options) {
        var onConstruction = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
        if (onConstruction) {
          this.grid = this.element;
          this.element.classList.add('months', 'datepicker-grid', 'w-64', 'grid', 'grid-cols-4');
          this.grid.appendChild(parseHTML(createTagRepeat('span', 12, {
            'data-month': function dataMonth(ix) {
              return ix;
            }
          })));
        }
        _get(_getPrototypeOf(MonthsView.prototype), "init", this).call(this, options);
      }
    }, {
      key: "setOptions",
      value: function setOptions(options) {
        if (options.locale) {
          this.monthNames = options.locale.monthsShort;
        }
        if (hasProperty(options, 'minDate')) {
          if (options.minDate === undefined) {
            this.minYear = this.minMonth = this.minDate = undefined;
          } else {
            var minDateObj = new Date(options.minDate);
            this.minYear = minDateObj.getFullYear();
            this.minMonth = minDateObj.getMonth();
            this.minDate = minDateObj.setDate(1);
          }
        }
        if (hasProperty(options, 'maxDate')) {
          if (options.maxDate === undefined) {
            this.maxYear = this.maxMonth = this.maxDate = undefined;
          } else {
            var maxDateObj = new Date(options.maxDate);
            this.maxYear = maxDateObj.getFullYear();
            this.maxMonth = maxDateObj.getMonth();
            this.maxDate = dateValue(this.maxYear, this.maxMonth + 1, 0);
          }
        }
        if (options.beforeShowMonth !== undefined) {
          this.beforeShow = typeof options.beforeShowMonth === 'function' ? options.beforeShowMonth : undefined;
        }
      }

      // Update view's settings to reflect the viewDate set on the picker
    }, {
      key: "updateFocus",
      value: function updateFocus() {
        var viewDate = new Date(this.picker.viewDate);
        this.year = viewDate.getFullYear();
        this.focused = viewDate.getMonth();
      }

      // Update view's settings to reflect the selected dates
    }, {
      key: "updateSelection",
      value: function updateSelection() {
        var _this$picker$datepick = this.picker.datepicker,
          dates = _this$picker$datepick.dates,
          rangepicker = _this$picker$datepick.rangepicker;
        this.selected = dates.reduce(function (selected, timeValue) {
          var date = new Date(timeValue);
          var year = date.getFullYear();
          var month = date.getMonth();
          if (selected[year] === undefined) {
            selected[year] = [month];
          } else {
            pushUnique(selected[year], month);
          }
          return selected;
        }, {});
        if (rangepicker && rangepicker.dates) {
          this.range = rangepicker.dates.map(function (timeValue) {
            var date = new Date(timeValue);
            return isNaN(date) ? undefined : [date.getFullYear(), date.getMonth()];
          });
        }
      }

      // Update the entire view UI
    }, {
      key: "render",
      value: function render() {
        var _this = this;
        // refresh disabled months on every render in order to clear the ones added
        // by beforeShow hook at previous render
        this.disabled = [];
        this.picker.setViewSwitchLabel(this.year);
        this.picker.setPrevBtnDisabled(this.year <= this.minYear);
        this.picker.setNextBtnDisabled(this.year >= this.maxYear);
        var selected = this.selected[this.year] || [];
        var yrOutOfRange = this.year < this.minYear || this.year > this.maxYear;
        var isMinYear = this.year === this.minYear;
        var isMaxYear = this.year === this.maxYear;
        var range = computeMonthRange(this.range, this.year);
        Array.from(this.grid.children).forEach(function (el, index) {
          var classList = el.classList;
          var date = dateValue(_this.year, index, 1);
          el.className = "datepicker-cell hover:bg-neutral-tertiary-medium block flex-1 leading-9 border-0 rounded-base cursor-pointer text-center text-body font-medium text-sm ".concat(_this.cellClass);
          if (_this.isMinView) {
            el.dataset.date = date;
          }
          // reset text on every render to clear the custom content set
          // by beforeShow hook at previous render
          el.textContent = _this.monthNames[index];
          if (yrOutOfRange || isMinYear && index < _this.minMonth || isMaxYear && index > _this.maxMonth) {
            classList.add('disabled');
          }
          if (range) {
            var _range2 = _slicedToArray(range, 2),
              rangeStart = _range2[0],
              rangeEnd = _range2[1];
            if (index > rangeStart && index < rangeEnd) {
              classList.add('range');
            }
            if (index === rangeStart) {
              classList.add('range-start');
            }
            if (index === rangeEnd) {
              classList.add('range-end');
            }
          }
          if (selected.includes(index)) {
            classList.add('selected', 'bg-brand', 'text-white', 'dark:text-white');
            classList.remove('text-body', 'hover:bg-neutral-tertiary-medium', 'dark:text-white');
          }
          if (index === _this.focused) {
            classList.add('focused');
          }
          if (_this.beforeShow) {
            _this.performBeforeHook(el, index, date);
          }
        });
      }

      // Update the view UI by applying the changes of selected and focused items
    }, {
      key: "refresh",
      value: function refresh() {
        var _this2 = this;
        var selected = this.selected[this.year] || [];
        var _ref = computeMonthRange(this.range, this.year) || [],
          _ref2 = _slicedToArray(_ref, 2),
          rangeStart = _ref2[0],
          rangeEnd = _ref2[1];
        this.grid.querySelectorAll('.range, .range-start, .range-end, .selected, .focused').forEach(function (el) {
          el.classList.remove('range', 'range-start', 'range-end', 'selected', 'bg-brand', 'dark:text-white', 'text-white', 'focused');
          el.classList.add('text-body', 'hover:bg-neutral-tertiary-medium', 'dark:text-white');
        });
        Array.from(this.grid.children).forEach(function (el, index) {
          var classList = el.classList;
          if (index > rangeStart && index < rangeEnd) {
            classList.add('range');
          }
          if (index === rangeStart) {
            classList.add('range-start');
          }
          if (index === rangeEnd) {
            classList.add('range-end');
          }
          if (selected.includes(index)) {
            classList.add('selected', 'bg-brand', 'text-white', 'dark:text-white');
            classList.remove('text-body', 'hover:bg-neutral-tertiary-medium', 'dark:text-white');
          }
          if (index === _this2.focused) {
            classList.add('focused');
          }
        });
      }

      // Update the view UI by applying the change of focused item
    }, {
      key: "refreshFocus",
      value: function refreshFocus() {
        this.grid.querySelectorAll('.focused').forEach(function (el) {
          el.classList.remove('focused');
        });
        this.grid.children[this.focused].classList.add('focused');
      }
    }]);
  }(View);

  function toTitleCase(word) {
    return _toConsumableArray(word).reduce(function (str, ch, ix) {
      return str += ix ? ch : ch.toUpperCase();
    }, '');
  }

  // Class representing the years and decades view elements
  var YearsView = /*#__PURE__*/function (_View) {
    function YearsView(picker, config) {
      _classCallCheck(this, YearsView);
      return _callSuper(this, YearsView, [picker, config]);
    }
    _inherits(YearsView, _View);
    return _createClass(YearsView, [{
      key: "init",
      value: function init(options) {
        var onConstruction = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
        if (onConstruction) {
          this.navStep = this.step * 10;
          this.beforeShowOption = "beforeShow".concat(toTitleCase(this.cellClass));
          this.grid = this.element;
          this.element.classList.add(this.name, 'datepicker-grid', 'w-64', 'grid', 'grid-cols-4');
          this.grid.appendChild(parseHTML(createTagRepeat('span', 12)));
        }
        _get(_getPrototypeOf(YearsView.prototype), "init", this).call(this, options);
      }
    }, {
      key: "setOptions",
      value: function setOptions(options) {
        if (hasProperty(options, 'minDate')) {
          if (options.minDate === undefined) {
            this.minYear = this.minDate = undefined;
          } else {
            this.minYear = startOfYearPeriod(options.minDate, this.step);
            this.minDate = dateValue(this.minYear, 0, 1);
          }
        }
        if (hasProperty(options, 'maxDate')) {
          if (options.maxDate === undefined) {
            this.maxYear = this.maxDate = undefined;
          } else {
            this.maxYear = startOfYearPeriod(options.maxDate, this.step);
            this.maxDate = dateValue(this.maxYear, 11, 31);
          }
        }
        if (options[this.beforeShowOption] !== undefined) {
          var beforeShow = options[this.beforeShowOption];
          this.beforeShow = typeof beforeShow === 'function' ? beforeShow : undefined;
        }
      }

      // Update view's settings to reflect the viewDate set on the picker
    }, {
      key: "updateFocus",
      value: function updateFocus() {
        var viewDate = new Date(this.picker.viewDate);
        var first = startOfYearPeriod(viewDate, this.navStep);
        var last = first + 9 * this.step;
        this.first = first;
        this.last = last;
        this.start = first - this.step;
        this.focused = startOfYearPeriod(viewDate, this.step);
      }

      // Update view's settings to reflect the selected dates
    }, {
      key: "updateSelection",
      value: function updateSelection() {
        var _this = this;
        var _this$picker$datepick = this.picker.datepicker,
          dates = _this$picker$datepick.dates,
          rangepicker = _this$picker$datepick.rangepicker;
        this.selected = dates.reduce(function (years, timeValue) {
          return pushUnique(years, startOfYearPeriod(timeValue, _this.step));
        }, []);
        if (rangepicker && rangepicker.dates) {
          this.range = rangepicker.dates.map(function (timeValue) {
            if (timeValue !== undefined) {
              return startOfYearPeriod(timeValue, _this.step);
            }
          });
        }
      }

      // Update the entire view UI
    }, {
      key: "render",
      value: function render() {
        var _this2 = this;
        // refresh disabled years on every render in order to clear the ones added
        // by beforeShow hook at previous render
        this.disabled = [];
        this.picker.setViewSwitchLabel("".concat(this.first, "-").concat(this.last));
        this.picker.setPrevBtnDisabled(this.first <= this.minYear);
        this.picker.setNextBtnDisabled(this.last >= this.maxYear);
        Array.from(this.grid.children).forEach(function (el, index) {
          var classList = el.classList;
          var current = _this2.start + index * _this2.step;
          var date = dateValue(current, 0, 1);
          el.className = "datepicker-cell hover:bg-neutral-tertiary-medium block flex-1 leading-9 border-0 rounded-base cursor-pointer text-center text-body font-medium text-sm ".concat(_this2.cellClass);
          if (_this2.isMinView) {
            el.dataset.date = date;
          }
          el.textContent = el.dataset.year = current;
          if (index === 0) {
            classList.add('prev');
          } else if (index === 11) {
            classList.add('next');
          }
          if (current < _this2.minYear || current > _this2.maxYear) {
            classList.add('disabled');
          }
          if (_this2.range) {
            var _this2$range = _slicedToArray(_this2.range, 2),
              rangeStart = _this2$range[0],
              rangeEnd = _this2$range[1];
            if (current > rangeStart && current < rangeEnd) {
              classList.add('range');
            }
            if (current === rangeStart) {
              classList.add('range-start');
            }
            if (current === rangeEnd) {
              classList.add('range-end');
            }
          }
          if (_this2.selected.includes(current)) {
            classList.add('selected', 'bg-brand', 'text-white', 'dark:text-white');
            classList.remove('text-body', 'hover:bg-neutral-tertiary-medium', 'dark:text-white');
          }
          if (current === _this2.focused) {
            classList.add('focused');
          }
          if (_this2.beforeShow) {
            _this2.performBeforeHook(el, current, date);
          }
        });
      }

      // Update the view UI by applying the changes of selected and focused items
    }, {
      key: "refresh",
      value: function refresh() {
        var _this3 = this;
        var _ref = this.range || [],
          _ref2 = _slicedToArray(_ref, 2),
          rangeStart = _ref2[0],
          rangeEnd = _ref2[1];
        this.grid.querySelectorAll('.range, .range-start, .range-end, .selected, .focused').forEach(function (el) {
          el.classList.remove('range', 'range-start', 'range-end', 'selected', 'bg-brand', 'text-white', 'dark:text-white', 'focused');
        });
        Array.from(this.grid.children).forEach(function (el) {
          var current = Number(el.textContent);
          var classList = el.classList;
          if (current > rangeStart && current < rangeEnd) {
            classList.add('range');
          }
          if (current === rangeStart) {
            classList.add('range-start');
          }
          if (current === rangeEnd) {
            classList.add('range-end');
          }
          if (_this3.selected.includes(current)) {
            classList.add('selected', 'bg-brand', 'text-white', 'hover:text-heading');
            classList.remove('text-body', 'hover:bg-neutral-tertiary-medium', 'hover:text-heading');
          }
          if (current === _this3.focused) {
            classList.add('focused');
          }
        });
      }

      // Update the view UI by applying the change of focused item
    }, {
      key: "refreshFocus",
      value: function refreshFocus() {
        var index = Math.round((this.focused - this.start) / this.step);
        this.grid.querySelectorAll('.focused').forEach(function (el) {
          el.classList.remove('focused');
        });
        this.grid.children[index].classList.add('focused');
      }
    }]);
  }(View);

  function triggerDatepickerEvent(datepicker, type) {
    var detail = {
      date: datepicker.getDate(),
      viewDate: new Date(datepicker.picker.viewDate),
      viewId: datepicker.picker.currentView.id,
      datepicker: datepicker
    };
    datepicker.element.dispatchEvent(new CustomEvent(type, {
      detail: detail
    }));
  }

  // direction: -1 (to previous), 1 (to next)
  function goToPrevOrNext(datepicker, direction) {
    var _datepicker$config = datepicker.config,
      minDate = _datepicker$config.minDate,
      maxDate = _datepicker$config.maxDate;
    var _datepicker$picker = datepicker.picker,
      currentView = _datepicker$picker.currentView,
      viewDate = _datepicker$picker.viewDate;
    var newViewDate;
    switch (currentView.id) {
      case 0:
        newViewDate = addMonths(viewDate, direction);
        break;
      case 1:
        newViewDate = addYears(viewDate, direction);
        break;
      default:
        newViewDate = addYears(viewDate, direction * currentView.navStep);
    }
    newViewDate = limitToRange(newViewDate, minDate, maxDate);
    datepicker.picker.changeFocus(newViewDate).render();
  }
  function switchView(datepicker) {
    var viewId = datepicker.picker.currentView.id;
    if (viewId === datepicker.config.maxView) {
      return;
    }
    datepicker.picker.changeView(viewId + 1).render();
  }
  function unfocus(datepicker) {
    if (datepicker.config.updateOnBlur) {
      datepicker.update({
        autohide: true
      });
    } else {
      datepicker.refresh('input');
      datepicker.hide();
    }
  }

  function goToSelectedMonthOrYear(datepicker, selection) {
    var picker = datepicker.picker;
    var viewDate = new Date(picker.viewDate);
    var viewId = picker.currentView.id;
    var newDate = viewId === 1 ? addMonths(viewDate, selection - viewDate.getMonth()) : addYears(viewDate, selection - viewDate.getFullYear());
    picker.changeFocus(newDate).changeView(viewId - 1).render();
  }
  function onClickTodayBtn(datepicker) {
    var picker = datepicker.picker;
    var currentDate = today();
    if (datepicker.config.todayBtnMode === 1) {
      if (datepicker.config.autohide) {
        datepicker.setDate(currentDate);
        return;
      }
      datepicker.setDate(currentDate, {
        render: false
      });
      picker.update();
    }
    if (picker.viewDate !== currentDate) {
      picker.changeFocus(currentDate);
    }
    picker.changeView(0).render();
  }
  function onClickClearBtn(datepicker) {
    datepicker.setDate({
      clear: true
    });
  }
  function onClickViewSwitch(datepicker) {
    switchView(datepicker);
  }
  function onClickPrevBtn(datepicker) {
    goToPrevOrNext(datepicker, -1);
  }
  function onClickNextBtn(datepicker) {
    goToPrevOrNext(datepicker, 1);
  }

  // For the picker's main block to delegete the events from `datepicker-cell`s
  function onClickView(datepicker, ev) {
    var target = findElementInEventPath(ev, '.datepicker-cell');
    if (!target || target.classList.contains('disabled')) {
      return;
    }
    var _datepicker$picker$cu = datepicker.picker.currentView,
      id = _datepicker$picker$cu.id,
      isMinView = _datepicker$picker$cu.isMinView;
    if (isMinView) {
      datepicker.setDate(Number(target.dataset.date));
    } else if (id === 1) {
      goToSelectedMonthOrYear(datepicker, Number(target.dataset.month));
    } else {
      goToSelectedMonthOrYear(datepicker, Number(target.dataset.year));
    }
  }
  function onClickPicker(datepicker) {
    if (!datepicker.inline && !datepicker.config.disableTouchKeyboard) {
      datepicker.inputField.focus();
    }
  }

  function processPickerOptions(picker, options) {
    if (options.title !== undefined) {
      if (options.title) {
        picker.controls.title.textContent = options.title;
        showElement(picker.controls.title);
      } else {
        picker.controls.title.textContent = '';
        hideElement(picker.controls.title);
      }
    }
    if (options.prevArrow) {
      var prevBtn = picker.controls.prevBtn;
      emptyChildNodes(prevBtn);
      options.prevArrow.forEach(function (node) {
        prevBtn.appendChild(node.cloneNode(true));
      });
    }
    if (options.nextArrow) {
      var nextBtn = picker.controls.nextBtn;
      emptyChildNodes(nextBtn);
      options.nextArrow.forEach(function (node) {
        nextBtn.appendChild(node.cloneNode(true));
      });
    }
    if (options.locale) {
      picker.controls.todayBtn.textContent = options.locale.today;
      picker.controls.clearBtn.textContent = options.locale.clear;
    }
    if (options.todayBtn !== undefined) {
      if (options.todayBtn) {
        showElement(picker.controls.todayBtn);
      } else {
        hideElement(picker.controls.todayBtn);
      }
    }
    if (hasProperty(options, 'minDate') || hasProperty(options, 'maxDate')) {
      var _picker$datepicker$co = picker.datepicker.config,
        minDate = _picker$datepicker$co.minDate,
        maxDate = _picker$datepicker$co.maxDate;
      picker.controls.todayBtn.disabled = !isInRange(today(), minDate, maxDate);
    }
    if (options.clearBtn !== undefined) {
      if (options.clearBtn) {
        showElement(picker.controls.clearBtn);
      } else {
        hideElement(picker.controls.clearBtn);
      }
    }
  }

  // Compute view date to reset, which will be...
  // - the last item of the selected dates or defaultViewDate if no selection
  // - limitted to minDate or maxDate if it exceeds the range
  function computeResetViewDate(datepicker) {
    var dates = datepicker.dates,
      config = datepicker.config;
    var viewDate = dates.length > 0 ? lastItemOf(dates) : config.defaultViewDate;
    return limitToRange(viewDate, config.minDate, config.maxDate);
  }

  // Change current view's view date
  function setViewDate(picker, newDate) {
    var oldViewDate = new Date(picker.viewDate);
    var newViewDate = new Date(newDate);
    var _picker$currentView = picker.currentView,
      id = _picker$currentView.id,
      year = _picker$currentView.year,
      first = _picker$currentView.first,
      last = _picker$currentView.last;
    var viewYear = newViewDate.getFullYear();
    picker.viewDate = newDate;
    if (viewYear !== oldViewDate.getFullYear()) {
      triggerDatepickerEvent(picker.datepicker, 'changeYear');
    }
    if (newViewDate.getMonth() !== oldViewDate.getMonth()) {
      triggerDatepickerEvent(picker.datepicker, 'changeMonth');
    }

    // return whether the new date is in different period on time from the one
    // displayed in the current view
    // when true, the view needs to be re-rendered on the next UI refresh.
    switch (id) {
      case 0:
        return newDate < first || newDate > last;
      case 1:
        return viewYear !== year;
      default:
        return viewYear < first || viewYear > last;
    }
  }
  function getTextDirection(el) {
    return window.getComputedStyle(el).direction;
  }

  // Class representing the picker UI
  var Picker = /*#__PURE__*/function () {
    function Picker(datepicker) {
      _classCallCheck(this, Picker);
      this.datepicker = datepicker;
      var template = pickerTemplate.replace(/%buttonClass%/g, datepicker.config.buttonClass);
      var element = this.element = parseHTML(template).firstChild;
      var _element$firstChild$c = _slicedToArray(element.firstChild.children, 3),
        header = _element$firstChild$c[0],
        main = _element$firstChild$c[1],
        footer = _element$firstChild$c[2];
      var title = header.firstElementChild;
      var _header$lastElementCh = _slicedToArray(header.lastElementChild.children, 3),
        prevBtn = _header$lastElementCh[0],
        viewSwitch = _header$lastElementCh[1],
        nextBtn = _header$lastElementCh[2];
      var _footer$firstChild$ch = _slicedToArray(footer.firstChild.children, 2),
        todayBtn = _footer$firstChild$ch[0],
        clearBtn = _footer$firstChild$ch[1];
      var controls = {
        title: title,
        prevBtn: prevBtn,
        viewSwitch: viewSwitch,
        nextBtn: nextBtn,
        todayBtn: todayBtn,
        clearBtn: clearBtn
      };
      this.main = main;
      this.controls = controls;
      var elementClass = datepicker.inline ? 'inline' : 'dropdown';
      element.classList.add("datepicker-".concat(elementClass));
      elementClass === 'dropdown' ? element.classList.add('dropdown', 'absolute', 'top-0', 'left-0', 'z-50', 'pt-2') : null;
      processPickerOptions(this, datepicker.config);
      this.viewDate = computeResetViewDate(datepicker);

      // set up event listeners
      registerListeners(datepicker, [[element, 'click', onClickPicker.bind(null, datepicker), {
        capture: true
      }], [main, 'click', onClickView.bind(null, datepicker)], [controls.viewSwitch, 'click', onClickViewSwitch.bind(null, datepicker)], [controls.prevBtn, 'click', onClickPrevBtn.bind(null, datepicker)], [controls.nextBtn, 'click', onClickNextBtn.bind(null, datepicker)], [controls.todayBtn, 'click', onClickTodayBtn.bind(null, datepicker)], [controls.clearBtn, 'click', onClickClearBtn.bind(null, datepicker)]]);

      // set up views
      this.views = [new DaysView(this), new MonthsView(this), new YearsView(this, {
        id: 2,
        name: 'years',
        cellClass: 'year',
        step: 1
      }), new YearsView(this, {
        id: 3,
        name: 'decades',
        cellClass: 'decade',
        step: 10
      })];
      this.currentView = this.views[datepicker.config.startView];
      this.currentView.render();
      this.main.appendChild(this.currentView.element);
      datepicker.config.container.appendChild(this.element);
    }
    return _createClass(Picker, [{
      key: "setOptions",
      value: function setOptions(options) {
        processPickerOptions(this, options);
        this.views.forEach(function (view) {
          view.init(options, false);
        });
        this.currentView.render();
      }
    }, {
      key: "detach",
      value: function detach() {
        this.datepicker.config.container.removeChild(this.element);
      }
    }, {
      key: "show",
      value: function show() {
        if (this.active) {
          return;
        }
        this.element.classList.add('active', 'block');
        this.element.classList.remove('hidden');
        this.active = true;
        var datepicker = this.datepicker;
        if (!datepicker.inline) {
          // ensure picker's direction matches input's
          var inputDirection = getTextDirection(datepicker.inputField);
          if (inputDirection !== getTextDirection(datepicker.config.container)) {
            this.element.dir = inputDirection;
          } else if (this.element.dir) {
            this.element.removeAttribute('dir');
          }
          this.place();
          if (datepicker.config.disableTouchKeyboard) {
            datepicker.inputField.blur();
          }
        }
        triggerDatepickerEvent(datepicker, 'show');
      }
    }, {
      key: "hide",
      value: function hide() {
        if (!this.active) {
          return;
        }
        this.datepicker.exitEditMode();
        this.element.classList.remove('active', 'block');
        this.element.classList.add('active', 'block', 'hidden');
        this.active = false;
        triggerDatepickerEvent(this.datepicker, 'hide');
      }
    }, {
      key: "place",
      value: function place() {
        var _this$element = this.element,
          classList = _this$element.classList,
          style = _this$element.style;
        var _this$datepicker = this.datepicker,
          config = _this$datepicker.config,
          inputField = _this$datepicker.inputField;
        var container = config.container;
        var _this$element$getBoun = this.element.getBoundingClientRect(),
          calendarWidth = _this$element$getBoun.width,
          calendarHeight = _this$element$getBoun.height;
        var _container$getBoundin = container.getBoundingClientRect(),
          containerLeft = _container$getBoundin.left,
          containerTop = _container$getBoundin.top,
          containerWidth = _container$getBoundin.width;
        var _inputField$getBoundi = inputField.getBoundingClientRect(),
          inputLeft = _inputField$getBoundi.left,
          inputTop = _inputField$getBoundi.top,
          inputWidth = _inputField$getBoundi.width,
          inputHeight = _inputField$getBoundi.height;
        var _config$orientation = config.orientation,
          orientX = _config$orientation.x,
          orientY = _config$orientation.y;
        var scrollTop;
        var left;
        var top;
        if (container === document.body) {
          scrollTop = window.scrollY;
          left = inputLeft + window.scrollX;
          top = inputTop + scrollTop;
        } else {
          scrollTop = container.scrollTop;
          left = inputLeft - containerLeft;
          top = inputTop - containerTop + scrollTop;
        }
        if (orientX === 'auto') {
          if (left < 0) {
            // align to the left and move into visible area if input's left edge < window's
            orientX = 'left';
            left = 10;
          } else if (left + calendarWidth > containerWidth) {
            // align to the right if canlendar's right edge > container's
            orientX = 'right';
          } else {
            orientX = getTextDirection(inputField) === 'rtl' ? 'right' : 'left';
          }
        }
        if (orientX === 'right') {
          left -= calendarWidth - inputWidth;
        }
        if (orientY === 'auto') {
          orientY = top - calendarHeight < scrollTop ? 'bottom' : 'top';
        }
        if (orientY === 'top') {
          top -= calendarHeight;
        } else {
          top += inputHeight;
        }
        classList.remove('datepicker-orient-top', 'datepicker-orient-bottom', 'datepicker-orient-right', 'datepicker-orient-left');
        classList.add("datepicker-orient-".concat(orientY), "datepicker-orient-".concat(orientX));
        style.top = top ? "".concat(top, "px") : top;
        style.left = left ? "".concat(left, "px") : left;
      }
    }, {
      key: "setViewSwitchLabel",
      value: function setViewSwitchLabel(labelText) {
        this.controls.viewSwitch.textContent = labelText;
      }
    }, {
      key: "setPrevBtnDisabled",
      value: function setPrevBtnDisabled(disabled) {
        this.controls.prevBtn.disabled = disabled;
      }
    }, {
      key: "setNextBtnDisabled",
      value: function setNextBtnDisabled(disabled) {
        this.controls.nextBtn.disabled = disabled;
      }
    }, {
      key: "changeView",
      value: function changeView(viewId) {
        var oldView = this.currentView;
        var newView = this.views[viewId];
        if (newView.id !== oldView.id) {
          this.currentView = newView;
          this._renderMethod = 'render';
          triggerDatepickerEvent(this.datepicker, 'changeView');
          this.main.replaceChild(newView.element, oldView.element);
        }
        return this;
      }

      // Change the focused date (view date)
    }, {
      key: "changeFocus",
      value: function changeFocus(newViewDate) {
        this._renderMethod = setViewDate(this, newViewDate) ? 'render' : 'refreshFocus';
        this.views.forEach(function (view) {
          view.updateFocus();
        });
        return this;
      }

      // Apply the change of the selected dates
    }, {
      key: "update",
      value: function update() {
        var newViewDate = computeResetViewDate(this.datepicker);
        this._renderMethod = setViewDate(this, newViewDate) ? 'render' : 'refresh';
        this.views.forEach(function (view) {
          view.updateFocus();
          view.updateSelection();
        });
        return this;
      }

      // Refresh the picker UI
    }, {
      key: "render",
      value: function render() {
        var quickRender = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;
        var renderMethod = quickRender && this._renderMethod || 'render';
        delete this._renderMethod;
        this.currentView[renderMethod]();
      }
    }]);
  }();

  // Find the closest date that doesn't meet the condition for unavailable date
  // Returns undefined if no available date is found
  // addFn: function to calculate the next date
  //   - args: time value, amount
  // increase: amount to pass to addFn
  // testFn: function to test the unavailablity of the date
  //   - args: time value; retun: true if unavailable
  function findNextAvailableOne(date, addFn, increase, testFn, min, max) {
    if (!isInRange(date, min, max)) {
      return;
    }
    if (testFn(date)) {
      var newDate = addFn(date, increase);
      return findNextAvailableOne(newDate, addFn, increase, testFn, min, max);
    }
    return date;
  }

  // direction: -1 (left/up), 1 (right/down)
  // vertical: true for up/down, false for left/right
  function moveByArrowKey(datepicker, ev, direction, vertical) {
    var picker = datepicker.picker;
    var currentView = picker.currentView;
    var step = currentView.step || 1;
    var viewDate = picker.viewDate;
    var addFn;
    var testFn;
    switch (currentView.id) {
      case 0:
        if (vertical) {
          viewDate = addDays(viewDate, direction * 7);
        } else if (ev.ctrlKey || ev.metaKey) {
          viewDate = addYears(viewDate, direction);
        } else {
          viewDate = addDays(viewDate, direction);
        }
        addFn = addDays;
        testFn = function testFn(date) {
          return currentView.disabled.includes(date);
        };
        break;
      case 1:
        viewDate = addMonths(viewDate, vertical ? direction * 4 : direction);
        addFn = addMonths;
        testFn = function testFn(date) {
          var dt = new Date(date);
          var year = currentView.year,
            disabled = currentView.disabled;
          return dt.getFullYear() === year && disabled.includes(dt.getMonth());
        };
        break;
      default:
        viewDate = addYears(viewDate, direction * (vertical ? 4 : 1) * step);
        addFn = addYears;
        testFn = function testFn(date) {
          return currentView.disabled.includes(startOfYearPeriod(date, step));
        };
    }
    viewDate = findNextAvailableOne(viewDate, addFn, direction < 0 ? -step : step, testFn, currentView.minDate, currentView.maxDate);
    if (viewDate !== undefined) {
      picker.changeFocus(viewDate).render();
    }
  }
  function onKeydown(datepicker, ev) {
    if (ev.key === 'Tab') {
      unfocus(datepicker);
      return;
    }
    var picker = datepicker.picker;
    var _picker$currentView = picker.currentView,
      id = _picker$currentView.id,
      isMinView = _picker$currentView.isMinView;
    if (!picker.active) {
      switch (ev.key) {
        case 'ArrowDown':
        case 'Escape':
          picker.show();
          break;
        case 'Enter':
          datepicker.update();
          break;
        default:
          return;
      }
    } else if (datepicker.editMode) {
      switch (ev.key) {
        case 'Escape':
          picker.hide();
          break;
        case 'Enter':
          datepicker.exitEditMode({
            update: true,
            autohide: datepicker.config.autohide
          });
          break;
        default:
          return;
      }
    } else {
      switch (ev.key) {
        case 'Escape':
          picker.hide();
          break;
        case 'ArrowLeft':
          if (ev.ctrlKey || ev.metaKey) {
            goToPrevOrNext(datepicker, -1);
          } else if (ev.shiftKey) {
            datepicker.enterEditMode();
            return;
          } else {
            moveByArrowKey(datepicker, ev, -1, false);
          }
          break;
        case 'ArrowRight':
          if (ev.ctrlKey || ev.metaKey) {
            goToPrevOrNext(datepicker, 1);
          } else if (ev.shiftKey) {
            datepicker.enterEditMode();
            return;
          } else {
            moveByArrowKey(datepicker, ev, 1, false);
          }
          break;
        case 'ArrowUp':
          if (ev.ctrlKey || ev.metaKey) {
            switchView(datepicker);
          } else if (ev.shiftKey) {
            datepicker.enterEditMode();
            return;
          } else {
            moveByArrowKey(datepicker, ev, -1, true);
          }
          break;
        case 'ArrowDown':
          if (ev.shiftKey && !ev.ctrlKey && !ev.metaKey) {
            datepicker.enterEditMode();
            return;
          }
          moveByArrowKey(datepicker, ev, 1, true);
          break;
        case 'Enter':
          if (isMinView) {
            datepicker.setDate(picker.viewDate);
          } else {
            picker.changeView(id - 1).render();
          }
          break;
        case 'Backspace':
        case 'Delete':
          datepicker.enterEditMode();
          return;
        default:
          if (ev.key.length === 1 && !ev.ctrlKey && !ev.metaKey) {
            datepicker.enterEditMode();
          }
          return;
      }
    }
    ev.preventDefault();
    ev.stopPropagation();
  }
  function onFocus(datepicker) {
    if (datepicker.config.showOnFocus && !datepicker._showing) {
      datepicker.show();
    }
  }

  // for the prevention for entering edit mode while getting focus on click
  function onMousedown(datepicker, ev) {
    var el = ev.target;
    if (datepicker.picker.active || datepicker.config.showOnClick) {
      el._active = el === document.activeElement;
      el._clicking = setTimeout(function () {
        delete el._active;
        delete el._clicking;
      }, 2000);
    }
  }
  function onClickInput(datepicker, ev) {
    var el = ev.target;
    if (!el._clicking) {
      return;
    }
    clearTimeout(el._clicking);
    delete el._clicking;
    if (el._active) {
      datepicker.enterEditMode();
    }
    delete el._active;
    if (datepicker.config.showOnClick) {
      datepicker.show();
    }
  }
  function onPaste(datepicker, ev) {
    if (ev.clipboardData.types.includes('text/plain')) {
      datepicker.enterEditMode();
    }
  }

  // for the `document` to delegate the events from outside the picker/input field
  function onClickOutside(datepicker, ev) {
    var element = datepicker.element;
    if (element !== document.activeElement) {
      return;
    }
    var pickerElem = datepicker.picker.element;
    if (findElementInEventPath(ev, function (el) {
      return el === element || el === pickerElem;
    })) {
      return;
    }
    unfocus(datepicker);
  }

  function stringifyDates(dates, config) {
    return dates.map(function (dt) {
      return formatDate(dt, config.format, config.locale);
    }).join(config.dateDelimiter);
  }

  // parse input dates and create an array of time values for selection
  // returns undefined if there are no valid dates in inputDates
  // when origDates (current selection) is passed, the function works to mix
  // the input dates into the current selection
  function processInputDates(datepicker, inputDates) {
    var clear = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    var config = datepicker.config,
      origDates = datepicker.dates,
      rangepicker = datepicker.rangepicker;
    if (inputDates.length === 0) {
      // empty input is considered valid unless origiDates is passed
      return clear ? [] : undefined;
    }
    var rangeEnd = rangepicker && datepicker === rangepicker.datepickers[1];
    var newDates = inputDates.reduce(function (dates, dt) {
      var date = parseDate(dt, config.format, config.locale);
      if (date === undefined) {
        return dates;
      }
      if (config.pickLevel > 0) {
        // adjust to 1st of the month/Jan 1st of the year
        // or to the last day of the monh/Dec 31st of the year if the datepicker
        // is the range-end picker of a rangepicker
        var _dt = new Date(date);
        if (config.pickLevel === 1) {
          date = rangeEnd ? _dt.setMonth(_dt.getMonth() + 1, 0) : _dt.setDate(1);
        } else {
          date = rangeEnd ? _dt.setFullYear(_dt.getFullYear() + 1, 0, 0) : _dt.setMonth(0, 1);
        }
      }
      if (isInRange(date, config.minDate, config.maxDate) && !dates.includes(date) && !config.datesDisabled.includes(date) && !config.daysOfWeekDisabled.includes(new Date(date).getDay())) {
        dates.push(date);
      }
      return dates;
    }, []);
    if (newDates.length === 0) {
      return;
    }
    if (config.multidate && !clear) {
      // get the synmetric difference between origDates and newDates
      newDates = newDates.reduce(function (dates, date) {
        if (!origDates.includes(date)) {
          dates.push(date);
        }
        return dates;
      }, origDates.filter(function (date) {
        return !newDates.includes(date);
      }));
    }
    // do length check always because user can input multiple dates regardless of the mode
    return config.maxNumberOfDates && newDates.length > config.maxNumberOfDates ? newDates.slice(config.maxNumberOfDates * -1) : newDates;
  }

  // refresh the UI elements
  // modes: 1: input only, 2, picker only, 3 both
  function refreshUI(datepicker) {
    var mode = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 3;
    var quickRender = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
    var config = datepicker.config,
      picker = datepicker.picker,
      inputField = datepicker.inputField;
    if (mode & 2) {
      var newView = picker.active ? config.pickLevel : config.startView;
      picker.update().changeView(newView).render(quickRender);
    }
    if (mode & 1 && inputField) {
      inputField.value = stringifyDates(datepicker.dates, config);
    }
  }
  function _setDate(datepicker, inputDates, options) {
    var clear = options.clear,
      render = options.render,
      autohide = options.autohide;
    if (render === undefined) {
      render = true;
    }
    if (!render) {
      autohide = false;
    } else if (autohide === undefined) {
      autohide = datepicker.config.autohide;
    }
    var newDates = processInputDates(datepicker, inputDates, clear);
    if (!newDates) {
      return;
    }
    if (newDates.toString() !== datepicker.dates.toString()) {
      datepicker.dates = newDates;
      refreshUI(datepicker, render ? 3 : 1);
      triggerDatepickerEvent(datepicker, 'changeDate');
    } else {
      refreshUI(datepicker, 1);
    }
    if (autohide) {
      datepicker.hide();
    }
  }

  /**
   * Class representing a date picker
   */
  var Datepicker = /*#__PURE__*/function () {
    /**
     * Create a date picker
     * @param  {Element} element - element to bind a date picker
     * @param  {Object} [options] - config options
     * @param  {DateRangePicker} [rangepicker] - DateRangePicker instance the
     * date picker belongs to. Use this only when creating date picker as a part
     * of date range picker
     */
    function Datepicker(element) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      var rangepicker = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : undefined;
      _classCallCheck(this, Datepicker);
      element.datepicker = this;
      this.element = element;

      // set up config
      var config = this.config = Object.assign({
        buttonClass: options.buttonClass && String(options.buttonClass) || 'button',
        container: document.body,
        defaultViewDate: today(),
        maxDate: undefined,
        minDate: undefined
      }, processOptions(defaultOptions, this));
      this._options = options;
      Object.assign(config, processOptions(options, this));

      // configure by type
      var inline = this.inline = element.tagName !== 'INPUT';
      var inputField;
      var initialDates;
      if (inline) {
        config.container = element;
        initialDates = stringToArray(element.dataset.date, config.dateDelimiter);
        delete element.dataset.date;
      } else {
        var container = options.container ? document.querySelector(options.container) : null;
        if (container) {
          config.container = container;
        }
        inputField = this.inputField = element;
        inputField.classList.add('datepicker-input');
        initialDates = stringToArray(inputField.value, config.dateDelimiter);
      }
      if (rangepicker) {
        // check validiry
        var index = rangepicker.inputs.indexOf(inputField);
        var datepickers = rangepicker.datepickers;
        if (index < 0 || index > 1 || !Array.isArray(datepickers)) {
          throw Error('Invalid rangepicker object.');
        }
        // attach itaelf to the rangepicker here so that processInputDates() can
        // determine if this is the range-end picker of the rangepicker while
        // setting inital values when pickLevel > 0
        datepickers[index] = this;
        // add getter for rangepicker
        Object.defineProperty(this, 'rangepicker', {
          get: function get() {
            return rangepicker;
          }
        });
      }

      // set initial dates
      this.dates = [];
      // process initial value
      var inputDateValues = processInputDates(this, initialDates);
      if (inputDateValues && inputDateValues.length > 0) {
        this.dates = inputDateValues;
      }
      if (inputField) {
        inputField.value = stringifyDates(this.dates, config);
      }
      var picker = this.picker = new Picker(this);
      if (inline) {
        this.show();
      } else {
        // set up event listeners in other modes
        var onMousedownDocument = onClickOutside.bind(null, this);
        var listeners = [[inputField, 'keydown', onKeydown.bind(null, this)], [inputField, 'focus', onFocus.bind(null, this)], [inputField, 'mousedown', onMousedown.bind(null, this)], [inputField, 'click', onClickInput.bind(null, this)], [inputField, 'paste', onPaste.bind(null, this)], [document, 'mousedown', onMousedownDocument], [document, 'touchstart', onMousedownDocument], [window, 'resize', picker.place.bind(picker)]];
        registerListeners(this, listeners);
      }
    }

    /**
     * Format Date object or time value in given format and language
     * @param  {Date|Number} date - date or time value to format
     * @param  {String|Object} format - format string or object that contains
     * toDisplay() custom formatter, whose signature is
     * - args:
     *   - date: {Date} - Date instance of the date passed to the method
     *   - format: {Object} - the format object passed to the method
     *   - locale: {Object} - locale for the language specified by `lang`
     * - return:
     *     {String} formatted date
     * @param  {String} [lang=en] - language code for the locale to use
     * @return {String} formatted date
     */
    return _createClass(Datepicker, [{
      key: "active",
      get:
      /**
       * @type {Boolean} - Whether the picker element is shown. `true` whne shown
       */
      function get() {
        return !!(this.picker && this.picker.active);
      }

      /**
       * @type {HTMLDivElement} - DOM object of picker element
       */
    }, {
      key: "pickerElement",
      get: function get() {
        return this.picker ? this.picker.element : undefined;
      }

      /**
       * Set new values to the config options
       * @param {Object} options - config options to update
       */
    }, {
      key: "setOptions",
      value: function setOptions(options) {
        var picker = this.picker;
        var newOptions = processOptions(options, this);
        Object.assign(this._options, options);
        Object.assign(this.config, newOptions);
        picker.setOptions(newOptions);
        refreshUI(this, 3);
      }

      /**
       * Show the picker element
       */
    }, {
      key: "show",
      value: function show() {
        if (this.inputField) {
          if (this.inputField.disabled) {
            return;
          }
          if (this.inputField !== document.activeElement) {
            this._showing = true;
            this.inputField.focus();
            delete this._showing;
          }
        }
        this.picker.show();
      }

      /**
       * Hide the picker element
       * Not available on inline picker
       */
    }, {
      key: "hide",
      value: function hide() {
        if (this.inline) {
          return;
        }
        this.picker.hide();
        this.picker.update().changeView(this.config.startView).render();
      }

      /**
       * Destroy the Datepicker instance
       * @return {Detepicker} - the instance destroyed
       */
    }, {
      key: "destroy",
      value: function destroy() {
        this.hide();
        unregisterListeners(this);
        this.picker.detach();
        if (!this.inline) {
          this.inputField.classList.remove('datepicker-input');
        }
        delete this.element.datepicker;
        return this;
      }

      /**
       * Get the selected date(s)
       *
       * The method returns a Date object of selected date by default, and returns
       * an array of selected dates in multidate mode. If format string is passed,
       * it returns date string(s) formatted in given format.
       *
       * @param  {String} [format] - Format string to stringify the date(s)
       * @return {Date|String|Date[]|String[]} - selected date(s), or if none is
       * selected, empty array in multidate mode and untitled in sigledate mode
       */
    }, {
      key: "getDate",
      value: function getDate() {
        var _this = this;
        var format = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : undefined;
        var callback = format ? function (date) {
          return formatDate(date, format, _this.config.locale);
        } : function (date) {
          return new Date(date);
        };
        if (this.config.multidate) {
          return this.dates.map(callback);
        }
        if (this.dates.length > 0) {
          return callback(this.dates[0]);
        }
      }

      /**
       * Set selected date(s)
       *
       * In multidate mode, you can pass multiple dates as a series of arguments
       * or an array. (Since each date is parsed individually, the type of the
       * dates doesn't have to be the same.)
       * The given dates are used to toggle the select status of each date. The
       * number of selected dates is kept from exceeding the length set to
       * maxNumberOfDates.
       *
       * With clear: true option, the method can be used to clear the selection
       * and to replace the selection instead of toggling in multidate mode.
       * If the option is passed with no date arguments or an empty dates array,
       * it works as "clear" (clear the selection then set nothing), and if the
       * option is passed with new dates to select, it works as "replace" (clear
       * the selection then set the given dates)
       *
       * When render: false option is used, the method omits re-rendering the
       * picker element. In this case, you need to call refresh() method later in
       * order for the picker element to reflect the changes. The input field is
       * refreshed always regardless of this option.
       *
       * When invalid (unparsable, repeated, disabled or out-of-range) dates are
       * passed, the method ignores them and applies only valid ones. In the case
       * that all the given dates are invalid, which is distinguished from passing
       * no dates, the method considers it as an error and leaves the selection
       * untouched.
       *
       * @param {...(Date|Number|String)|Array} [dates] - Date strings, Date
       * objects, time values or mix of those for new selection
       * @param {Object} [options] - function options
       * - clear: {boolean} - Whether to clear the existing selection
       *     defualt: false
       * - render: {boolean} - Whether to re-render the picker element
       *     default: true
       * - autohide: {boolean} - Whether to hide the picker element after re-render
       *     Ignored when used with render: false
       *     default: config.autohide
       */
    }, {
      key: "setDate",
      value: function setDate() {
        for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        }
        var dates = [].concat(args);
        var opts = {};
        var lastArg = lastItemOf(args);
        if (_typeof(lastArg) === 'object' && !Array.isArray(lastArg) && !(lastArg instanceof Date) && lastArg) {
          Object.assign(opts, dates.pop());
        }
        var inputDates = Array.isArray(dates[0]) ? dates[0] : dates;
        _setDate(this, inputDates, opts);
      }

      /**
       * Update the selected date(s) with input field's value
       * Not available on inline picker
       *
       * The input field will be refreshed with properly formatted date string.
       *
       * @param  {Object} [options] - function options
       * - autohide: {boolean} - whether to hide the picker element after refresh
       *     default: false
       */
    }, {
      key: "update",
      value: function update() {
        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : undefined;
        if (this.inline) {
          return;
        }
        var opts = {
          clear: true,
          autohide: !!(options && options.autohide)
        };
        var inputDates = stringToArray(this.inputField.value, this.config.dateDelimiter);
        _setDate(this, inputDates, opts);
      }

      /**
       * Refresh the picker element and the associated input field
       * @param {String} [target] - target item when refreshing one item only
       * 'picker' or 'input'
       * @param {Boolean} [forceRender] - whether to re-render the picker element
       * regardless of its state instead of optimized refresh
       */
    }, {
      key: "refresh",
      value: function refresh() {
        var target = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : undefined;
        var forceRender = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
        if (target && typeof target !== 'string') {
          forceRender = target;
          target = undefined;
        }
        var mode;
        if (target === 'picker') {
          mode = 2;
        } else if (target === 'input') {
          mode = 1;
        } else {
          mode = 3;
        }
        refreshUI(this, mode, !forceRender);
      }

      /**
       * Enter edit mode
       * Not available on inline picker or when the picker element is hidden
       */
    }, {
      key: "enterEditMode",
      value: function enterEditMode() {
        if (this.inline || !this.picker.active || this.editMode) {
          return;
        }
        this.editMode = true;
        this.inputField.classList.add('in-edit', 'border-brand');
      }

      /**
       * Exit from edit mode
       * Not available on inline picker
       * @param  {Object} [options] - function options
       * - update: {boolean} - whether to call update() after exiting
       *     If false, input field is revert to the existing selection
       *     default: false
       */
    }, {
      key: "exitEditMode",
      value: function exitEditMode() {
        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : undefined;
        if (this.inline || !this.editMode) {
          return;
        }
        var opts = Object.assign({
          update: false
        }, options);
        delete this.editMode;
        this.inputField.classList.remove('in-edit', 'border-brand');
        if (opts.update) {
          this.update(opts);
        }
      }
    }], [{
      key: "formatDate",
      value: function formatDate$1(date, format, lang) {
        return formatDate(date, format, lang && locales[lang] || locales.en);
      }

      /**
       * Parse date string
       * @param  {String|Date|Number} dateStr - date string, Date object or time
       * value to parse
       * @param  {String|Object} format - format string or object that contains
       * toValue() custom parser, whose signature is
       * - args:
       *   - dateStr: {String|Date|Number} - the dateStr passed to the method
       *   - format: {Object} - the format object passed to the method
       *   - locale: {Object} - locale for the language specified by `lang`
       * - return:
       *     {Date|Number} parsed date or its time value
       * @param  {String} [lang=en] - language code for the locale to use
       * @return {Number} time value of parsed date
       */
    }, {
      key: "parseDate",
      value: function parseDate$1(dateStr, format, lang) {
        return parseDate(dateStr, format, lang && locales[lang] || locales.en);
      }

      /**
       * @type {Object} - Installed locales in `[languageCode]: localeObject` format
       * en`:_English (US)_ is pre-installed.
       */
    }, {
      key: "locales",
      get: function get() {
        return locales;
      }
    }]);
  }();

  // filter out the config options inapproprite to pass to Datepicker
  function filterOptions(options) {
    var newOpts = Object.assign({}, options);
    delete newOpts.inputs;
    delete newOpts.allowOneSidedRange;
    delete newOpts.maxNumberOfDates; // to ensure each datepicker handles a single date

    return newOpts;
  }
  function setupDatepicker(rangepicker, changeDateListener, el, options) {
    registerListeners(rangepicker, [[el, 'changeDate', changeDateListener]]);
    new Datepicker(el, options, rangepicker);
  }
  function onChangeDate(rangepicker, ev) {
    // to prevent both datepickers trigger the other side's update each other
    if (rangepicker._updating) {
      return;
    }
    rangepicker._updating = true;
    var target = ev.target;
    if (target.datepicker === undefined) {
      return;
    }
    var datepickers = rangepicker.datepickers;
    var setDateOptions = {
      render: false
    };
    var changedSide = rangepicker.inputs.indexOf(target);
    var otherSide = changedSide === 0 ? 1 : 0;
    var changedDate = datepickers[changedSide].dates[0];
    var otherDate = datepickers[otherSide].dates[0];
    if (changedDate !== undefined && otherDate !== undefined) {
      // if the start of the range > the end, swap them
      if (changedSide === 0 && changedDate > otherDate) {
        datepickers[0].setDate(otherDate, setDateOptions);
        datepickers[1].setDate(changedDate, setDateOptions);
      } else if (changedSide === 1 && changedDate < otherDate) {
        datepickers[0].setDate(changedDate, setDateOptions);
        datepickers[1].setDate(otherDate, setDateOptions);
      }
    } else if (!rangepicker.allowOneSidedRange) {
      // to prevent the range from becoming one-sided, copy changed side's
      // selection (no matter if it's empty) to the other side
      if (changedDate !== undefined || otherDate !== undefined) {
        setDateOptions.clear = true;
        datepickers[otherSide].setDate(datepickers[changedSide].dates, setDateOptions);
      }
    }
    datepickers[0].picker.update().render();
    datepickers[1].picker.update().render();
    delete rangepicker._updating;
  }

  /**
   * Class representing a date range picker
   */
  var DateRangePicker = /*#__PURE__*/function () {
    /**
     * Create a date range picker
     * @param  {Element} element - element to bind a date range picker
     * @param  {Object} [options] - config options
     */
    function DateRangePicker(element) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      _classCallCheck(this, DateRangePicker);
      var inputs = Array.isArray(options.inputs) ? options.inputs : Array.from(element.querySelectorAll('input'));
      if (inputs.length < 2) {
        return;
      }
      element.rangepicker = this;
      this.element = element;
      this.inputs = inputs.slice(0, 2);
      this.allowOneSidedRange = !!options.allowOneSidedRange;
      var changeDateListener = onChangeDate.bind(null, this);
      var cleanOptions = filterOptions(options);
      // in order for initial date setup to work right when pcicLvel > 0,
      // let Datepicker constructor add the instance to the rangepicker
      var datepickers = [];
      Object.defineProperty(this, 'datepickers', {
        get: function get() {
          return datepickers;
        }
      });
      setupDatepicker(this, changeDateListener, this.inputs[0], cleanOptions);
      setupDatepicker(this, changeDateListener, this.inputs[1], cleanOptions);
      Object.freeze(datepickers);
      // normalize the range if inital dates are given
      if (datepickers[0].dates.length > 0) {
        onChangeDate(this, {
          target: this.inputs[0]
        });
      } else if (datepickers[1].dates.length > 0) {
        onChangeDate(this, {
          target: this.inputs[1]
        });
      }
    }

    /**
     * @type {Array} - selected date of the linked date pickers
     */
    return _createClass(DateRangePicker, [{
      key: "dates",
      get: function get() {
        return this.datepickers.length === 2 ? [this.datepickers[0].dates[0], this.datepickers[1].dates[0]] : undefined;
      }

      /**
       * Set new values to the config options
       * @param {Object} options - config options to update
       */
    }, {
      key: "setOptions",
      value: function setOptions(options) {
        this.allowOneSidedRange = !!options.allowOneSidedRange;
        var cleanOptions = filterOptions(options);
        this.datepickers[0].setOptions(cleanOptions);
        this.datepickers[1].setOptions(cleanOptions);
      }

      /**
       * Destroy the DateRangePicker instance
       * @return {DateRangePicker} - the instance destroyed
       */
    }, {
      key: "destroy",
      value: function destroy() {
        this.datepickers[0].destroy();
        this.datepickers[1].destroy();
        unregisterListeners(this);
        delete this.element.rangepicker;
      }

      /**
       * Get the start and end dates of the date range
       *
       * The method returns Date objects by default. If format string is passed,
       * it returns date strings formatted in given format.
       * The result array always contains 2 items (start date/end date) and
       * undefined is used for unselected side. (e.g. If none is selected,
       * the result will be [undefined, undefined]. If only the end date is set
       * when allowOneSidedRange config option is true, [undefined, endDate] will
       * be returned.)
       *
       * @param  {String} [format] - Format string to stringify the dates
       * @return {Array} - Start and end dates
       */
    }, {
      key: "getDates",
      value: function getDates() {
        var _this = this;
        var format = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : undefined;
        var callback = format ? function (date) {
          return formatDate(date, format, _this.datepickers[0].config.locale);
        } : function (date) {
          return new Date(date);
        };
        return this.dates.map(function (date) {
          return date === undefined ? date : callback(date);
        });
      }

      /**
       * Set the start and end dates of the date range
       *
       * The method calls datepicker.setDate() internally using each of the
       * arguments in start→end order.
       *
       * When a clear: true option object is passed instead of a date, the method
       * clears the date.
       *
       * If an invalid date, the same date as the current one or an option object
       * without clear: true is passed, the method considers that argument as an
       * "ineffective" argument because calling datepicker.setDate() with those
       * values makes no changes to the date selection.
       *
       * When the allowOneSidedRange config option is false, passing {clear: true}
       * to clear the range works only when it is done to the last effective
       * argument (in other words, passed to rangeEnd or to rangeStart along with
       * ineffective rangeEnd). This is because when the date range is changed,
       * it gets normalized based on the last change at the end of the changing
       * process.
       *
       * @param {Date|Number|String|Object} rangeStart - Start date of the range
       * or {clear: true} to clear the date
       * @param {Date|Number|String|Object} rangeEnd - End date of the range
       * or {clear: true} to clear the date
       */
    }, {
      key: "setDates",
      value: function setDates(rangeStart, rangeEnd) {
        var _this$datepickers = _slicedToArray(this.datepickers, 2),
          datepicker0 = _this$datepickers[0],
          datepicker1 = _this$datepickers[1];
        var origDates = this.dates;

        // If range normalization runs on every change, we can't set a new range
        // that starts after the end of the current range correctly because the
        // normalization process swaps start↔︎end right after setting the new start
        // date. To prevent this, the normalization process needs to run once after
        // both of the new dates are set.
        this._updating = true;
        datepicker0.setDate(rangeStart);
        datepicker1.setDate(rangeEnd);
        delete this._updating;
        if (datepicker1.dates[0] !== origDates[1]) {
          onChangeDate(this, {
            target: this.inputs[1]
          });
        } else if (datepicker0.dates[0] !== origDates[0]) {
          onChangeDate(this, {
            target: this.inputs[0]
          });
        }
      }
    }]);
  }();

  exports.DateRangePicker = DateRangePicker;
  exports.Datepicker = Datepicker;

  Object.defineProperty(exports, '__esModule', { value: true });

}));
