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2
3
4/*!
5  * Bootstrap v4.6.0 (https://getbootstrap.com/)
6  * Copyright 2011-2021 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
7  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
8  */
9(function (global, factory) {
10  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('jquery')) :
11  typeof define === 'function' && define.amd ? define(['exports', 'jquery'], factory) :
12  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.bootstrap = {}, global.jQuery));
13}(this, (function (exports, $) { 'use strict';
14
15  function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
16
17  var $__default = /*#__PURE__*/_interopDefaultLegacy($);
18
19  function _defineProperties(target, props) {
20    for (var i = 0; i < props.length; i++) {
21      var descriptor = props[i];
22      descriptor.enumerable = descriptor.enumerable || false;
23      descriptor.configurable = true;
24      if ("value" in descriptor) descriptor.writable = true;
25      Object.defineProperty(target, descriptor.key, descriptor);
26    }
27  }
28
29  function _createClass(Constructor, protoProps, staticProps) {
30    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
31    if (staticProps) _defineProperties(Constructor, staticProps);
32    return Constructor;
33  }
34
35  function _extends() {
36    _extends = Object.assign || function (target) {
37      for (var i = 1; i < arguments.length; i++) {
38        var source = arguments[i];
39
40        for (var key in source) {
41          if (Object.prototype.hasOwnProperty.call(source, key)) {
42            target[key] = source[key];
43          }
44        }
45      }
46
47      return target;
48    };
49
50    return _extends.apply(this, arguments);
51  }
52
53  function _inheritsLoose(subClass, superClass) {
54    subClass.prototype = Object.create(superClass.prototype);
55    subClass.prototype.constructor = subClass;
56    subClass.__proto__ = superClass;
57  }
58
59  /**
60   * --------------------------------------------------------------------------
61   * Bootstrap (v4.6.0): util.js
62   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
63   * --------------------------------------------------------------------------
64   */
65  /**
66   * ------------------------------------------------------------------------
67   * Private TransitionEnd Helpers
68   * ------------------------------------------------------------------------
69   */
70
71  var TRANSITION_END = 'transitionend';
72  var MAX_UID = 1000000;
73  var MILLISECONDS_MULTIPLIER = 1000; // Shoutout AngusCroll (https://goo.gl/pxwQGp)
74
75  function toType(obj) {
76    if (obj === null || typeof obj === 'undefined') {
77      return "" + obj;

78    }
79
80    return {}.toString.call(obj).match(/\s([a-z]+)/i)[1].toLowerCase();
81  }
82
83  function getSpecialTransitionEndEvent() {
84    return {
85      bindType: TRANSITION_END,
86      delegateType: TRANSITION_END,
87      handle: function handle(event) {
88        if ($__default['default'](event.target).is(this)) {
89          return event.handleObj.handler.apply(this, arguments); // eslint-disable-line prefer-rest-params
90        }
91
92        return undefined;
93      }
94    };
95  }
96
97  function transitionEndEmulator(duration) {
98    var _this = this;
99
100    var called = false;
101    $__default['default'](this).one(Util.TRANSITION_END, function () {
102      called = true;
103    });
104    setTimeout(function () {
105      if (!called) {
106        Util.triggerTransitionEnd(_this);
107      }
108    }, duration);
109    return this;
110  }
111
112  function setTransitionEndSupport() {
113    $__default['default'].fn.emulateTransitionEnd = transitionEndEmulator;
114    $__default['default'].event.special[Util.TRANSITION_END] = getSpecialTransitionEndEvent();
115  }
116  /**
117   * --------------------------------------------------------------------------
118   * Public Util Api
119   * --------------------------------------------------------------------------
120   */
121
122
123  var Util = {
124    TRANSITION_END: 'bsTransitionEnd',
125    getUID: function getUID(prefix) {
126      do {
127        prefix += ~~(Math.random() * MAX_UID); // "~~" acts like a faster Math.floor() here
128      } while (document.getElementById(prefix));
129
130      return prefix;
131    },
132    getSelectorFromElement: function getSelectorFromElement(element) {
133      var selector = element.getAttribute('data-target');
134
135      if (!selector || selector === '#') {
136        var hrefAttr = element.getAttribute('href');
137        selector = hrefAttr && hrefAttr !== '#' ? hrefAttr.trim() : '';
138      }
139
140      try {
141        return document.querySelector(selector) ? selector : null;
142      } catch (_) {
143        return null;
144      }
145    },
146    getTransitionDurationFromElement: function getTransitionDurationFromElement(element) {
147      if (!element) {
148        return 0;
149      } // Get transition-duration of the element
150
151
152      var transitionDuration = $__default['default'](element).css('transition-duration');
153      var transitionDelay = $__default['default'](element).css('transition-delay');
154      var floatTransitionDuration = parseFloat(transitionDuration);
155      var floatTransitionDelay = parseFloat(transitionDelay); // Return 0 if element or transition duration is not found
156
157      if (!floatTransitionDuration && !floatTransitionDelay) {
158        return 0;
159      } // If multiple durations are defined, take the first
160
161
162      transitionDuration = transitionDuration.split(',')[0];
163      transitionDelay = transitionDelay.split(',')[0];
164      return (parseFloat(transitionDuration) + parseFloat(transitionDelay)) * MILLISECONDS_MULTIPLIER;
165    },
166    reflow: function reflow(element) {
167      return element.offsetHeight;
168    },
169    triggerTransitionEnd: function triggerTransitionEnd(element) {
170      $__default['default'](element).trigger(TRANSITION_END);
171    },
172    supportsTransitionEnd: function supportsTransitionEnd() {
173      return Boolean(TRANSITION_END);
174    },
175    isElement: function isElement(obj) {
176      return (obj[0] || obj).nodeType;
177    },
178    typeCheckConfig: function typeCheckConfig(componentName, config, configTypes) {
179      for (var property in configTypes) {
180        if (Object.prototype.hasOwnProperty.call(configTypes, property)) {
181          var expectedTypes = configTypes[property];
182          var value = config[property];
183          var valueType = value && Util.isElement(value) ? 'element' : toType(value);
184
185          if (!new RegExp(expectedTypes).test(valueType)) {
186            throw new Error(componentName.toUpperCase() + ": " + ("Option \"" + property + "\" provided type \"" + valueType + "\" ") + ("but expected type \"" + expectedTypes + "\"."));
187          }
188        }
189      }
190    },
191    findShadowRoot: function findShadowRoot(element) {
192      if (!document.documentElement.attachShadow) {
193        return null;
194      } // Can find the shadow root otherwise it'll return the document
195
196
197      if (typeof element.getRootNode === 'function') {
198        var root = element.getRootNode();
199        return root instanceof ShadowRoot ? root : null;
200      }
201
202      if (element instanceof ShadowRoot) {
203        return element;
204      } // when we don't find a shadow root
205
206
207      if (!element.parentNode) {
208        return null;
209      }
210
211      return Util.findShadowRoot(element.parentNode);
212    },
213    jQueryDetection: function jQueryDetection() {
214      if (typeof $__default['default'] === 'undefined') {
215        throw new TypeError('Bootstrap\'s JavaScript requires jQuery. jQuery must be included before Bootstrap\'s JavaScript.');
216      }
217
218      var version = $__default['default'].fn.jquery.split(' ')[0].split('.');
219      var minMajor = 1;
220      var ltMajor = 2;
221      var minMinor = 9;
222      var minPatch = 1;
223      var maxMajor = 4;
224
225      if (version[0] < ltMajor && version[1] < minMinor || version[0] === minMajor && version[1] === minMinor && version[2] < minPatch || version[0] >= maxMajor) {
226        throw new Error('Bootstrap\'s JavaScript requires at least jQuery v1.9.1 but less than v4.0.0');
227      }
228    }
229  };
230  Util.jQueryDetection();
231  setTransitionEndSupport();
232  
233   /**!
234   * @fileOverview Kickass library to create and place poppers near their reference elements.
235   * @version 1.16.1
236   * @license
237   * Copyright (c) 2016 Federico Zivolo and contributors
238   *
239   * Permission is hereby granted, free of charge, to any person obtaining a copy
240   * of this software and associated documentation files (the "Software"), to deal
241   * in the Software without restriction, including without limitation the rights
242   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
243   * copies of the Software, and to permit persons to whom the Software is
244   * furnished to do so, subject to the following conditions:
245   *
246   * The above copyright notice and this permission notice shall be included in all
247   * copies or substantial portions of the Software.
248   *
249   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
250   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
251   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
252   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
253   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
254   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
255   * SOFTWARE.
256   */
257  var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && typeof navigator !== 'undefined';
258
259  var timeoutDuration = function () {
260    var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
261    for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
262      if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
263        return 1;
264      }
265    }
266    return 0;
267  }();
268
269  function microtaskDebounce(fn) {
270    var called = false;
271    return function () {
272      if (called) {
273        return;
274      }
275      called = true;
276      window.Promise.resolve().then(function () {
277        called = false;
278        fn();
279      });
280    };
281  }
282
283  function taskDebounce(fn) {
284    var scheduled = false;
285    return function () {
286      if (!scheduled) {
287        scheduled = true;
288        setTimeout(function () {
289          scheduled = false;
290          fn();
291        }, timeoutDuration);
292      }
293    };
294  }
295
296  var supportsMicroTasks = isBrowser && window.Promise;
297
298  /**
299  * Create a debounced version of a method, that's asynchronously deferred
300  * but called in the minimum time possible.
301  *
302  * @method
303  * @memberof Popper.Utils
304  * @argument {Function} fn
305  * @returns {Function}
306  */
307  var debounce = supportsMicroTasks ? microtaskDebounce : taskDebounce;
308
309  /**
310   * Check if the given variable is a function
311   * @method
312   * @memberof Popper.Utils
313   * @argument {Any} functionToCheck - variable to check
314   * @returns {Boolean} answer to: is a function?
315   */
316  function isFunction(functionToCheck) {
317    var getType = {};
318    return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
319  }
320
321  /**
322   * Get CSS computed property of the given element
323   * @method
324   * @memberof Popper.Utils
325   * @argument {Eement} element
326   * @argument {String} property
327   */
328  function getStyleComputedProperty(element, property) {
329    if (element.nodeType !== 1) {
330      return [];
331    }
332    // NOTE: 1 DOM access here
333    var window = element.ownerDocument.defaultView;
334    var css = window.getComputedStyle(element, null);
335    return property ? css[property] : css;
336  }
337
338  /**
339   * Returns the parentNode or the host of the element
340   * @method
341   * @memberof Popper.Utils
342   * @argument {Element} element
343   * @returns {Element} parent
344   */
345  function getParentNode(element) {
346    if (element.nodeName === 'HTML') {
347      return element;
348    }
349    return element.parentNode || element.host;
350  }
351
352  /**
353   * Returns the scrolling parent of the given element
354   * @method
355   * @memberof Popper.Utils
356   * @argument {Element} element
357   * @returns {Element} scroll parent
358   */
359  function getScrollParent(element) {
360    // Return body, `getScroll` will take care to get the correct `scrollTop` from it
361    if (!element) {
362      return document.body;
363    }
364
365    switch (element.nodeName) {
366      case 'HTML':
367      case 'BODY':
368        return element.ownerDocument.body;
369      case '#document':
370        return element.body;
371    }
372
373    // Firefox want us to check `-x` and `-y` variations as well
374
375    var _getStyleComputedProp = getStyleComputedProperty(element),
376        overflow = _getStyleComputedProp.overflow,
377        overflowX = _getStyleComputedProp.overflowX,
378        overflowY = _getStyleComputedProp.overflowY;
379
380    if (/(auto|scroll|overlay)/.test(overflow + overflowY + overflowX)) {
381      return element;
382    }
383
384    return getScrollParent(getParentNode(element));
385  }
386
387  /**
388   * Returns the reference node of the reference object, or the reference object itself.
389   * @method
390   * @memberof Popper.Utils

391   * @param {Element|Object} reference - the reference element (the popper will be relative to this)
392   * @returns {Element} parent
393   */
394  function getReferenceNode(reference) {
395    return reference && reference.referenceNode ? reference.referenceNode : reference;
396  }
397
398  var isIE11 = isBrowser && !!(window.MSInputMethodContext && document.documentMode);
399  var isIE10 = isBrowser && /MSIE 10/.test(navigator.userAgent);
400
401  /**
402   * Determines if the browser is Internet Explorer
403   * @method
404   * @memberof Popper.Utils
405   * @param {Number} version to check
406   * @returns {Boolean} isIE
407   */
408  function isIE(version) {
409    if (version === 11) {
410      return isIE11;
411    }
412    if (version === 10) {
413      return isIE10;
414    }
415    return isIE11 || isIE10;
416  }
417
418  /**
419   * Returns the offset parent of the given element
420   * @method
421   * @memberof Popper.Utils
422   * @argument {Element} element
423   * @returns {Element} offset parent
424   */
425  function getOffsetParent(element) {
426    if (!element) {
427      return document.documentElement;
428    }
429
430    var noOffsetParent = isIE(10) ? document.body : null;
431
432    // NOTE: 1 DOM access here
433    var offsetParent = element.offsetParent || null;
434    // Skip hidden elements which don't have an offsetParent
435    while (offsetParent === noOffsetParent && element.nextElementSibling) {
436      offsetParent = (element = element.nextElementSibling).offsetParent;
437    }
438
439    var nodeName = offsetParent && offsetParent.nodeName;
440
441    if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
442      return element ? element.ownerDocument.documentElement : document.documentElement;
443    }
444
445    // .offsetParent will return the closest TH, TD or TABLE in case
446    // no offsetParent is present, I hate this job...
447    if (['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 && getStyleComputedProperty(offsetParent, 'position') === 'static') {
448      return getOffsetParent(offsetParent);
449    }
450
451    return offsetParent;
452  }
453
454  function isOffsetContainer(element) {
455    var nodeName = element.nodeName;
456
457    if (nodeName === 'BODY') {
458      return false;
459    }
460    return nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element;
461  }
462
463  /**
464   * Finds the root node (document, shadowDOM root) of the given element
465   * @method
466   * @memberof Popper.Utils
467   * @argument {Element} node
468   * @returns {Element} root node
469   */
470  function getRoot(node) {
471    if (node.parentNode !== null) {
472      return getRoot(node.parentNode);
473    }
474
475    return node;
476  }
477
478  /**
479   * Finds the offset parent common to the two provided nodes
480   * @method
481   * @memberof Popper.Utils
482   * @argument {Element} element1
483   * @argument {Element} element2
484   * @returns {Element} common offset parent
485   */
486  function findCommonOffsetParent(element1, element2) {
487    // This check is needed to avoid errors in case one of the elements isn't defined for any reason
488    if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
489      return document.documentElement;
490    }
491
492    // Here we make sure to give as "start" the element that comes first in the DOM
493    var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
494    var start = order ? element1 : element2;
495    var end = order ? element2 : element1;
496
497    // Get common ancestor container
498    var range = document.createRange();
499    range.setStart(start, 0);
500    range.setEnd(end, 0);
501    var commonAncestorContainer = range.commonAncestorContainer;
502
503    // Both nodes are inside #document
504
505    if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
506      if (isOffsetContainer(commonAncestorContainer)) {
507        return commonAncestorContainer;
508      }
509
510      return getOffsetParent(commonAncestorContainer);
511    }
512
513    // one of the nodes is inside shadowDOM, find which one
514    var element1root = getRoot(element1);
515    if (element1root.host) {
516      return findCommonOffsetParent(element1root.host, element2);
517    } else {
518      return findCommonOffsetParent(element1, getRoot(element2).host);
519    }
520  }
521
522  /**
523   * Gets the scroll value of the given element in the given side (top and left)
524   * @method
525   * @memberof Popper.Utils
526   * @argument {Element} element
527   * @argument {String} side `top` or `left`
528   * @returns {number} amount of scrolled pixels
529   */
530  function getScroll(element) {
531    var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';
532
533    var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
534    var nodeName = element.nodeName;
535
536    if (nodeName === 'BODY' || nodeName === 'HTML') {
537      var html = element.ownerDocument.documentElement;
538      var scrollingElement = element.ownerDocument.scrollingElement || html;
539      return scrollingElement[upperSide];
540    }
541
542    return element[upperSide];
543  }
544
545  /*
546   * Sum or subtract the element scroll values (left and top) from a given rect object
547   * @method
548   * @memberof Popper.Utils
549   * @param {Object} rect - Rect object you want to change
550   * @param {HTMLElement} element - The element from the function reads the scroll values
551   * @param {Boolean} subtract - set to true if you want to subtract the scroll values
552   * @return {Object} rect - The modifier rect object
553   */
554  function includeScroll(rect, element) {
555    var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
556
557    var scrollTop = getScroll(element, 'top');
558    var scrollLeft = getScroll(element, 'left');
559    var modifier = subtract ? -1 : 1;
560    rect.top += scrollTop * modifier;
561    rect.bottom += scrollTop * modifier;
562    rect.left += scrollLeft * modifier;
563    rect.right += scrollLeft * modifier;
564    return rect;
565  }
566
567  /*
568   * Helper to detect borders of a given element
569   * @method
570   * @memberof Popper.Utils
571   * @param {CSSStyleDeclaration} styles
572   * Result of `getStyleComputedProperty` on the given element
573   * @param {String} axis - `x` or `y`
574   * @return {number} borders - The borders size of the given axis
575   */
576
577  function getBordersSize(styles, axis) {
578    var sideA = axis === 'x' ? 'Left' : 'Top';
579    var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
580
581    return parseFloat(styles['border' + sideA + 'Width']) + parseFloat(styles['border' + sideB + 'Width']);
582  }
583
584  function getSize(axis, body, html, computedStyle) {
585    return Math.max(body['offset' + axis], body['scroll' + axis], html['client' + axis], html['offset' + axis], html['scroll' + axis], isIE(10) ? parseInt(html['offset' + axis]) + parseInt(computedStyle['margin' + (axis === 'Height' ? 'Top' : 'Left')]) + parseInt(computedStyle['margin' + (axis === 'Height' ? 'Bottom' : 'Right')]) : 0);
586  }
587
588  function getWindowSizes(document) {
589    var body = document.body;
590    var html = document.documentElement;
591    var computedStyle = isIE(10) && getComputedStyle(html);
592
593    return {
594      height: getSize('Height', body, html, computedStyle),
595      width: getSize('Width', body, html, computedStyle)
596    };
597  }
598
599  var classCallCheck = function (instance, Constructor) {
600    if (!(instance instanceof Constructor)) {
601      throw new TypeError("Cannot call a class as a function");
602    }
603  };
604
605  var createClass = function () {
606    function defineProperties(target, props) {
607      for (var i = 0; i < props.length; i++) {
608        var descriptor = props[i];
609        descriptor.enumerable = descriptor.enumerable || false;
610        descriptor.configurable = true;
611        if ("value" in descriptor) descriptor.writable = true;
612        Object.defineProperty(target, descriptor.key, descriptor);
613      }
614    }
615
616    return function (Constructor, protoProps, staticProps) {
617      if (protoProps) defineProperties(Constructor.prototype, protoProps);
618      if (staticProps) defineProperties(Constructor, staticProps);
619      return Constructor;
620    };
621  }();
622
623
624
625
626
627  var defineProperty = function (obj, key, value) {
628    if (key in obj) {
629      Object.defineProperty(obj, key, {
630        value: value,
631        enumerable: true,
632        configurable: true,
633        writable: true
634      });
635    } else {
636      obj[key] = value;
637    }
638
639    return obj;

640  };
641
642  var _extends$1 = Object.assign || function (target) {
643    for (var i = 1; i < arguments.length; i++) {
644      var source = arguments[i];
645
646      for (var key in source) {
647        if (Object.prototype.hasOwnProperty.call(source, key)) {
648          target[key] = source[key];
649        }
650      }
651    }
652
653    return target;
654  };
655
656  /**
657   * Given element offsets, generate an output similar to getBoundingClientRect
658   * @method
659   * @memberof Popper.Utils
660   * @argument {Object} offsets
661   * @returns {Object} ClientRect like output
662   */
663  function getClientRect(offsets) {
664    return _extends$1({}, offsets, {
665      right: offsets.left + offsets.width,
666      bottom: offsets.top + offsets.height
667    });
668  }
669
670  /**
671   * Get bounding client rect of given element
672   * @method
673   * @memberof Popper.Utils
674   * @param {HTMLElement} element
675   * @return {Object} client rect
676   */
677  function getBoundingClientRect(element) {
678    var rect = {};
679
680    // IE10 10 FIX: Please, don't ask, the element isn't
681    // considered in DOM in some circumstances...
682    // This isn't reproducible in IE10 compatibility mode of IE11
683    try {
684      if (isIE(10)) {
685        rect = element.getBoundingClientRect();
686        var scrollTop = getScroll(element, 'top');
687        var scrollLeft = getScroll(element, 'left');
688        rect.top += scrollTop;
689        rect.left += scrollLeft;
690        rect.bottom += scrollTop;
691        rect.right += scrollLeft;
692      } else {
693        rect = element.getBoundingClientRect();
694      }
695    } catch (e) {}
696
697    var result = {
698      left: rect.left,
699      top: rect.top,
700      width: rect.right - rect.left,
701      height: rect.bottom - rect.top
702    };
703
704    // subtract scrollbar size from sizes
705    var sizes = element.nodeName === 'HTML' ? getWindowSizes(element.ownerDocument) : {};
706    var width = sizes.width || element.clientWidth || result.width;
707    var height = sizes.height || element.clientHeight || result.height;
708
709    var horizScrollbar = element.offsetWidth - width;
710    var vertScrollbar = element.offsetHeight - height;
711
712    // if an hypothetical scrollbar is detected, we must be sure it's not a `border`
713    // we make this check conditional for performance reasons
714    if (horizScrollbar || vertScrollbar) {
715      var styles = getStyleComputedProperty(element);
716      horizScrollbar -= getBordersSize(styles, 'x');
717      vertScrollbar -= getBordersSize(styles, 'y');
718
719      result.width -= horizScrollbar;
720      result.height -= vertScrollbar;
721    }
722
723    return getClientRect(result);
724  }
725
726  function getOffsetRectRelativeToArbitraryNode(children, parent) {
727    var fixedPosition = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
728
729    var isIE10 = isIE(10);
730    var isHTML = parent.nodeName === 'HTML';
731    var childrenRect = getBoundingClientRect(children);
732    var parentRect = getBoundingClientRect(parent);
733    var scrollParent = getScrollParent(children);
734
735    var styles = getStyleComputedProperty(parent);
736    var borderTopWidth = parseFloat(styles.borderTopWidth);
737    var borderLeftWidth = parseFloat(styles.borderLeftWidth);
738
739    // In cases where the parent is fixed, we must ignore negative scroll in offset calc
740    if (fixedPosition && isHTML) {
741      parentRect.top = Math.max(parentRect.top, 0);
742      parentRect.left = Math.max(parentRect.left, 0);
743    }
744    var offsets = getClientRect({
745      top: childrenRect.top - parentRect.top - borderTopWidth,
746      left: childrenRect.left - parentRect.left - borderLeftWidth,
747      width: childrenRect.width,
748      height: childrenRect.height
749    });
750    offsets.marginTop = 0;
751    offsets.marginLeft = 0;
752
753    // Subtract margins of documentElement in case it's being used as parent
754    // we do this only on HTML because it's the only element that behaves
755    // differently when margins are applied to it. The margins are included in
756    // the box of the documentElement, in the other cases not.
757    if (!isIE10 && isHTML) {
758      var marginTop = parseFloat(styles.marginTop);
759      var marginLeft = parseFloat(styles.marginLeft);
760
761      offsets.top -= borderTopWidth - marginTop;
762      offsets.bottom -= borderTopWidth - marginTop;
763      offsets.left -= borderLeftWidth - marginLeft;
764      offsets.right -= borderLeftWidth - marginLeft;
765
766      // Attach marginTop and marginLeft because in some circumstances we may need them
767      offsets.marginTop = marginTop;
768      offsets.marginLeft = marginLeft;
769    }
770
771    if (isIE10 && !fixedPosition ? parent.contains(scrollParent) : parent === scrollParent && scrollParent.nodeName !== 'BODY') {
772      offsets = includeScroll(offsets, parent);
773    }
774
775    return offsets;
776  }
777
778  function getViewportOffsetRectRelativeToArtbitraryNode(element) {
779    var excludeScroll = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
780
781    var html = element.ownerDocument.documentElement;
782    var relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
783    var width = Math.max(html.clientWidth, window.innerWidth || 0);
784    var height = Math.max(html.clientHeight, window.innerHeight || 0);
785
786    var scrollTop = !excludeScroll ? getScroll(html) : 0;
787    var scrollLeft = !excludeScroll ? getScroll(html, 'left') : 0;
788
789    var offset = {
790      top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
791      left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
792      width: width,
793      height: height
794    };
795
796    return getClientRect(offset);
797  }
798
799  /**
800   * Check if the given element is fixed or is inside a fixed parent
801   * @method
802   * @memberof Popper.Utils
803   * @argument {Element} element
804   * @argument {Element} customContainer
805   * @returns {Boolean} answer to "isFixed?"
806   */
807  function isFixed(element) {
808    var nodeName = element.nodeName;
809    if (nodeName === 'BODY' || nodeName === 'HTML') {
810      return false;
811    }
812    if (getStyleComputedProperty(element, 'position') === 'fixed') {
813      return true;
814    }
815    var parentNode = getParentNode(element);
816    if (!parentNode) {
817      return false;
818    }
819    return isFixed(parentNode);
820  }
821
822  /**
823   * Finds the first parent of an element that has a transformed property defined
824   * @method
825   * @memberof Popper.Utils
826   * @argument {Element} element
827   * @returns {Element} first transformed parent or documentElement
828   */
829
830  function getFixedPositionOffsetParent(element) {
831    // This check is needed to avoid errors in case one of the elements isn't defined for any reason
832    if (!element || !element.parentElement || isIE()) {
833      return document.documentElement;
834    }
835    var el = element.parentElement;
836    while (el && getStyleComputedProperty(el, 'transform') === 'none') {
837      el = el.parentElement;
838    }
839    return el || document.documentElement;
840  }
841
842  /**
843   * Computed the boundaries limits and return them
844   * @method
845   * @memberof Popper.Utils
846   * @param {HTMLElement} popper
847   * @param {HTMLElement} reference
848   * @param {number} padding
849   * @param {HTMLElement} boundariesElement - Element used to define the boundaries
850   * @param {Boolean} fixedPosition - Is in fixed position mode
851   * @returns {Object} Coordinates of the boundaries
852   */
853  function getBoundaries(popper, reference, padding, boundariesElement) {
854    var fixedPosition = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
855
856    // NOTE: 1 DOM access here
857
858    var boundaries = { top: 0, left: 0 };
859    var offsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, getReferenceNode(reference));
860
861    // Handle viewport case
862    if (boundariesElement === 'viewport') {
863      boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent, fixedPosition);
864    } else {
865      // Handle other cases based on DOM element used as boundaries
866      var boundariesNode = void 0;
867      if (boundariesElement === 'scrollParent') {
868        boundariesNode = getScrollParent(getParentNode(reference));
869        if (boundariesNode.nodeName === 'BODY') {
870          boundariesNode = popper.ownerDocument.documentElement;
871        }
872      } else if (boundariesElement === 'window') {
873        boundariesNode = popper.ownerDocument.documentElement;
874      } else {
875        boundariesNode = boundariesElement;
876      }
877
878      var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent, fixedPosition);
879
880      // In case of HTML, we need a different computation
881      if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
882        var _getWindowSizes = getWindowSizes(popper.ownerDocument),
883            height = _getWindowSizes.height,
884            width = _getWindowSizes.width;
885
886        boundaries.top += offsets.top - offsets.marginTop;
887        boundaries.bottom = height + offsets.top;
888        boundaries.left += offsets.left - offsets.marginLeft;
889        boundaries.right = width + offsets.left;
890      } else {
891        // for all the other DOM elements, this one is good
892        boundaries = offsets;
893      }
894    }
895
896    // Add paddings
897    padding = padding || 0;
898    var isPaddingNumber = typeof padding === 'number';
899    boundaries.left += isPaddingNumber ? padding : padding.left || 0;
900    boundaries.top += isPaddingNumber ? padding : padding.top || 0;
901    boundaries.right -= isPaddingNumber ? padding : padding.right || 0;
902    boundaries.bottom -= isPaddingNumber ? padding : padding.bottom || 0;
903
904    return boundaries;
905  }
906
907  function getArea(_ref) {
908    var width = _ref.width,
909        height = _ref.height;
910
911    return width * height;
912  }
913
914  /**
915   * Utility used to transform the `auto` placement to the placement with more
916   * available space.
917   * @method
918   * @memberof Popper.Utils
919   * @argument {Object} data - The data object generated by update method
920   * @argument {Object} options - Modifiers configuration and options
921   * @returns {Object} The data object, properly modified
922   */
923  function computeAutoPlacement(placement, refRect, popper, reference, boundariesElement) {
924    var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0;
925
926    if (placement.indexOf('auto') === -1) {
927      return placement;
928    }
929
930    var boundaries = getBoundaries(popper, reference, padding, boundariesElement);
931
932    var rects = {
933      top: {
934        width: boundaries.width,
935        height: refRect.top - boundaries.top
936      },
937      right: {
938        width: boundaries.right - refRect.right,
939        height: boundaries.height
940      },
941      bottom: {
942        width: boundaries.width,
943        height: boundaries.bottom - refRect.bottom
944      },
945      left: {
946        width: refRect.left - boundaries.left,
947        height: boundaries.height
948      }
949    };
950
951    var sortedAreas = Object.keys(rects).map(function (key) {
952      return _extends$1({
953        key: key
954      }, rects[key], {
955        area: getArea(rects[key])
956      });
957    }).sort(function (a, b) {
958      return b.area - a.area;
959    });

996 object containing width and height properties
997   */
998  function getOuterSizes(element) {
999    var window = element.ownerDocument.defaultView;
1000    var styles = window.getComputedStyle(element);
1001    var x = parseFloat(styles.marginTop || 0) + parseFloat(styles.marginBottom || 0);
1002    var y = parseFloat(styles.marginLeft || 0) + parseFloat(styles.marginRight || 0);
1003    var result = {
1004      width: element.offsetWidth + y,
1005      height: element.offsetHeight + x
1006    };
1007    return result;
1008  }
1009
1010  /**
1011   * Get the opposite placement of the given one
1012   * @method
1013   * @memberof Popper.Utils
1014   * @argument {String} placement
1015   * @returns {String} flipped placement
1016   */
1017  function getOppositePlacement(placement) {
1018    var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
1019    return placement.replace(/left|right|bottom|top/g, function (matched) {
1020      return hash[matched];
1021    });
1022  }
1023
1024  /**
1025   * Get offsets to the popper
1026   * @method
1027   * @memberof Popper.Utils
1028   * @param {Object} position - CSS position the Popper will get applied
1029   * @param {HTMLElement} popper - the popper element
1030   * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
1031   * @param {String} placement - one of the valid placement options
1032   * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
1033   */
1034  function getPopperOffsets(popper, referenceOffsets, placement) {
1035    placement = placement.split('-')[0];
1036
1037    // Get popper node sizes
1038    var popperRect = getOuterSizes(popper);
1039
1040    // Add position, width and height to our offsets object
1041    var popperOffsets = {
1042      width: popperRect.width,
1043      height: popperRect.height
1044    };
1045
1046    // depending by the popper placement we have to compute its offsets slightly differently
1047    var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
1048    var mainSide = isHoriz ? 'top' : 'left';
1049    var secondarySide = isHoriz ? 'left' : 'top';
1050    var measurement = isHoriz ? 'height' : 'width';
1051    var secondaryMeasurement = !isHoriz ? 'height' : 'width';
1052
1053    popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
1054    if (placement === secondarySide) {
1055      popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
1056    } else {
1057      popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
1058    }
1059
1060    return popperOffsets;
1061  }
1062
1063  /**
1064   * Mimics the `find` method of Array
1065   * @method
1066   * @memberof Popper.Utils
1067   * @argument {Array} arr
1068   * @argument prop
1069   * @argument value
1070   * @returns index or -1
1071   */
1072  function find(arr, check) {
1073    // use native find if supported
1074    if (Array.prototype.find) {
1075      return arr.find(check);
1076    }
1077
1078    // use `filter` to obtain the same behavior of `find`
1079    return arr.filter(check)[0];
1080  }
1081
1082  /**
1083   * Return the index of the matching object
1084   * @method
1085   * @memberof Popper.Utils
1086   * @argument {Array} arr
1087   * @argument prop
1088   * @argument value
1089   * @returns index or -1
1090   */
1091  function findIndex(arr, prop, value) {
1092    // use native findIndex if supported
1093    if (Array.prototype.findIndex) {
1094      return arr.findIndex(function (cur) {
1095        return cur[prop] === value;
1096      });
1097    }
1098
1099    // use `find` + `indexOf` if `findIndex` isn't supported
1100    var match = find(arr, function (obj) {
1101      return obj[prop] === value;
1102    });
1103    return arr.indexOf(match);
1104  }
1105
1106  /**
1107   * Loop trough the list of modifiers and run them in order,
1108   * each of them will then edit the data object.
1109   * @method
1110   * @memberof Popper.Utils
1111   * @param {dataObject} data
1112   * @param {Array} modifiers
1113   * @param {String} ends - Optional modifier name used as stopper
1114   * @returns {dataObject}
1115   */
1116  function runModifiers(modifiers, data, ends) {
1117    var modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));
1118

1119    modifiersToRun.forEach(function (modifier) {
1120      if (modifier['function']) {
1121        // eslint-disable-line dot-notation
1122        console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
1123      }
1124      var fn = modifier['function'] || modifier.fn; // eslint-disable-line dot-notation
1125      if (modifier.enabled && isFunction(fn)) {
1126        // Add properties to offsets to make them a complete clientRect object
1127        // we do this before each modifier to make sure the previous one doesn't
1128        // mess with these values
1129        data.offsets.popper = getClientRect(data.offsets.popper);
1130        data.offsets.reference = getClientRect(data.offsets.reference);
1131
1132        data = fn(data, modifier);
1133      }
1134    });
1135
1136    return data;
1137  }
1138
1139  /**
1140   * Updates the position of the popper, computing the new offsets and applying
1141   * the new style.<br />
1142   * Prefer `scheduleUpdate` over `update` because of performance reasons.
1143   * @method
1144   * @memberof Popper
1145   */
1146  function update() {
1147    // if popper is destroyed, don't perform any further update
1148    if (this.state.isDestroyed) {
1149      return;
1150    }
1151
1152    var data = {
1153      instance: this,
1154      styles: {},
1155      arrowStyles: {},
1156      attributes: {},
1157      flipped: false,
1158      offsets: {}
1159    };
1160
1161    // compute reference element offsets
1162    data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference, this.options.positionFixed);
1163
1164    // compute auto placement, store placement inside the data object,
1165    // modifiers will be able to edit `placement` if needed
1166    // and refer to originalPlacement to know the original value
1167    data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);
1168
1169    // store the computed placement inside `originalPlacement`
1170    data.originalPlacement = data.placement;
1171
1172    data.positionFixed = this.options.positionFixed;
1173
1174    // compute the popper offsets
1175    data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);
1176
1177    data.offsets.popper.position = this.options.positionFixed ? 'fixed' : 'absolute';
1178
1179    // run the modifiers
1180    data = runModifiers(this.modifiers, data);
1181
1182    // the first `update` will call `onCreate` callback
1183    // the other ones will call `onUpdate` callback
1184    if (!this.state.isCreated) {
1185      this.state.isCreated = true;
1186      this.options.onCreate(data);
1187    } else {
1188      this.options.onUpdate(data);
1189    }
1190  }
1191
1192  /**
1193   * Helper used to know if the given modifier is enabled.
1194   * @method
1195   * @memberof Popper.Utils
1196   * @returns {Boolean}
1197   */
1198  function isModifierEnabled(modifiers, modifierName) {
1199    return modifiers.some(function (_ref) {
1200      var name = _ref.name,
1201          enabled = _ref.enabled;
1202      return enabled && name === modifierName;
1203    });
1204  }
1205
1206  /**
1207   * Get the prefixed supported property name
1208   * @method
1209   * @memberof Popper.Utils
1210   * @argument {String} property (camelCase)
1211   * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
1212   */
1213  function getSupportedPropertyName(property) {
1214    var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
1215    var upperProp = property.charAt(0).toUpperCase() + property.slice(1);
1216
1217    for (var i = 0; i < prefixes.length; i++) {
1218      var prefix = prefixes[i];
1219      var toCheck = prefix ? '' + prefix + upperProp : property;
1220      if (typeof document.body.style[toCheck] !== 'undefined') {
1221        return toCheck;
1222      }
1223    }
1224    return null;
1225  }
1226
1227  /**
1228   * Destroys the popper.
1229   * @method
1230   * @memberof Popper
1231   */
1232  function destroy() {
1233    this.state.isDestroyed = true;
1234
1235    // touch DOM only if `applyStyle` modifier is enabled
1236    if (isModifierEnabled(this.modifiers, 'applyStyle')) {
1237      this.popper.removeAttribute('x-placement');
1238      this.popper.style.position = '';
1239      this.popper.style.top = '';
1240      this.popper.style.left = '';
1241      this.popper.style.right = '';
1242      this.popper.style.bottom = '';
1243      this.popper.style.willChange = '';
1244      this.popper.style[getSupportedPropertyName('transform')] = '';
1245    }
1246
1247    this.disableEventListeners();
1248
1249    // remove the popper if user explicitly asked for the deletion on destroy
1250    // do not use `remove` because IE11 doesn't support it
1251    if (this.options.removeOnDestroy) {
1252      this.popper.parentNode.removeChild(this.popper);
1253    }
1254    return this;
1255  }
1256
1257  /**
1258   * Get the window associated with the element
1259   * @argument {Element} element
1260   * @returns {Window}
1261   */
1262  function getWindow(element) {
1263    var ownerDocument = element.ownerDocument;
1264    return ownerDocument ? ownerDocument.defaultView : window;
1265  }
1266
1267  function attachToScrollParents(scrollParent, event, callback, scrollParents) {
1268    var isBody = scrollParent.nodeName === 'BODY';
1269    var target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;
1270    target.addEventListener(event, callback, { passive: true });
1271
1272    if (!isBody) {
1273      attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
1274    }
1275    scrollParents.push(target);
1276  }
1277
1278  /**
1279   * Setup needed event listeners used to update the popper position
1280   * @method
1281   * @memberof Popper.Utils
1282   * @private
1283   */
1284  function setupEventListeners(reference, options, state, updateBound) {
1285    // Resize event listener on window
1286    state.updateBound = updateBound;
1287    getWindow(reference).addEventListener('resize', state.updateBound, { passive: true });
1288
1289    // Scroll event listener on scroll parents
1290    var scrollElement = getScrollParent(reference);
1291    attachToScrollParents(scrollElement, 'scroll', state.updateBound, state.scrollParents);
1292    state.scrollElement = scrollElement;
1293    state.eventsEnabled = true;
1294
1295    return state;
1296  }
1297
1298  /**
1299   * It will add resize/scroll events and start recalculating
1300   * position of the popper element when they are triggered.
1301   * @method
1302   * @memberof Popper
1303   */
1304  function enableEventListeners() {
1305    if (!this.state.eventsEnabled) {
1306      this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
1307    }
1308  }
1309
1310  /**
1311   * Remove event listeners used to update the popper position
1312   * @method
1313   * @memberof Popper.Utils
1314   * @private
1315   */
1316  function removeEventListeners(reference, state) {
1317    // Remove resize event listener on window
1318    getWindow(reference).removeEventListener('resize', state.updateBound);
1319
1320    // Remove scroll event listener on scroll parents
1321    state.scrollParents.forEach(function (target) {
1322      target.removeEventListener('scroll', state.updateBound);
1323    });
1324
1325    // Reset state
1326    state.updateBound = null;
1327    state.scrollParents = [];
1328    state.scrollElement = null;
1329    state.eventsEnabled = false;
1330    return state;
1331  }
1332
1333  /**
1334   * It will remove resize/scroll events and won't recalculate popper position
1335   * when they are triggered. It also won't trigger `onUpdate` callback anymore,
1336   * unless you call `update` method manually.
1337   * @method
1338   * @memberof Popper
1339   */
1340  function disableEventListeners() {
1341    if (this.state.eventsEnabled) {
1342      cancelAnimationFrame(this.scheduleUpdate);
1343      this.state = removeEventListeners(this.reference, this.state);
1344    }
1345  }
1346
1347  /**
1348   * Tells if a given input is a number
1349   * @method
1350   * @memberof Popper.Utils
1351   * @param {*} input to check
1352   * @return {Boolean}
1353   */
1354  function isNumeric(n) {
1355    return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
1356  }
1357
1358  /**
1359   * Set the style to the given popper
1360   * @method
1361   * @memberof Popper.Utils
1362   * @argument {Element} element - Element to apply the style to
1363   * @argument {Object} styles
1364   * Object with a list of properties and values which will be applied to the element
1365   */
1366  function setStyles(element, styles) {
1367    Object.keys(styles).forEach(function (prop) {
1368      var unit = '';
1369      // add unit if the value is numeric and is one of the following
1370      if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
1371        unit = 'px';
1372      }
1373      element.style[prop] = styles[prop] + unit;
1374    });

1417    if (data.arrowElement && Object.keys(data.arrowStyles).length) {
1418      setStyles(data.arrowElement, data.arrowStyles);
1419    }
1420
1421    return data;
1422  }
1423
1424  /**
1425   * Set the x-placement attribute before everything else because it could be used
1426   * to add margins to the popper margins needs to be calculated to get the
1427   * correct popper offsets.
1428   * @method
1429   * @memberof Popper.modifiers
1430   * @param {HTMLElement} reference - The reference element used to position the popper
1431   * @param {HTMLElement} popper - The HTML element used as popper
1432   * @param {Object} options - Popper.js options
1433   */
1434  function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
1435    // compute reference element offsets
1436    var referenceOffsets = getReferenceOffsets(state, popper, reference, options.positionFixed);
1437
1438    // compute auto placement, store placement inside the data object,
1439    // modifiers will be able to edit `placement` if needed
1440    // and refer to originalPlacement to know the original value
1441    var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);
1442
1443    popper.setAttribute('x-placement', placement);
1444
1445    // Apply `position` to popper before anything else because
1446    // without the position applied we can't guarantee correct computations
1447    setStyles(popper, { position: options.positionFixed ? 'fixed' : 'absolute' });
1448
1449    return options;
1450  }
1451
1452  /**
1453   * @function
1454   * @memberof Popper.Utils
1455   * @argument {Object} data - The data object generated by `update` method
1456   * @argument {Boolean} shouldRound - If the offsets should be rounded at all
1457   * @returns {Object} The popper's position offsets rounded
1458   *
1459   * The tale of pixel-perfect positioning. It's still not 100% perfect, but as
1460   * good as it can be within reason.
1461   * Discussion here: https://github.com/FezVrasta/popper.js/pull/715
1462   *
1463   * Low DPI screens cause a popper to be blurry if not using full pixels (Safari
1464   * as well on High DPI screens).
1465   *
1466   * Firefox prefers no rounding for positioning and does not have blurriness on
1467   * high DPI screens.
1468   *
1469   * Only horizontal placement and left/right values need to be considered.
1470   */
1471  function getRoundedOffsets(data, shouldRound) {
1472    var _data$offsets = data.offsets,
1473        popper = _data$offsets.popper,
1474        reference = _data$offsets.reference;
1475    var round = Math.round,
1476        floor = Math.floor;
1477
1478    var noRound = function noRound(v) {
1479      return v;
1480    };
1481
1482    var referenceWidth = round(reference.width);
1483    var popperWidth = round(popper.width);
1484
1485    var isVertical = ['left', 'right'].indexOf(data.placement) !== -1;
1486    var isVariation = data.placement.indexOf('-') !== -1;
1487    var sameWidthParity = referenceWidth % 2 === popperWidth % 2;
1488    var bothOddWidth = referenceWidth % 2 === 1 && popperWidth % 2 === 1;
1489
1490    var horizontalToInteger = !shouldRound ? noRound : isVertical || isVariation || sameWidthParity ? round : floor;
1491    var verticalToInteger = !shouldRound ? noRound : round;
1492
1493    return {
1494      left: horizontalToInteger(bothOddWidth && !isVariation && shouldRound ? popper.left - 1 : popper.left),
1495      top: verticalToInteger(popper.top),
1496      bottom: verticalToInteger(popper.bottom),
1497      right: horizontalToInteger(popper.right)
1498    };
1499  }
1500
1501  var isFirefox = isBrowser && /Firefox/i.test(navigator.userAgent);
1502
1503  /**
1504   * @function
1505   * @memberof Modifiers
1506   * @argument {Object} data - The data object generated by `update` method
1507   * @argument {Object} options - Modifiers configuration and options
1508   * @returns {Object} The data object, properly modified
1509   */
1510  function computeStyle(data, options) {
1511    var x = options.x,
1512        y = options.y;
1513    var popper = data.offsets.popper;
1514
1515    // Remove this legacy support in Popper.js v2
1516
1517    var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {
1518      return modifier.name === 'applyStyle';
1519    }).gpuAcceleration;
1520    if (legacyGpuAccelerationOption !== undefined) {
1521      console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
1522    }
1523    var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;
1524
1525    var offsetParent = getOffsetParent(data.instance.popper);
1526    var offsetParentRect = getBoundingClientRect(offsetParent);
1527
1528    // Styles
1529    var styles = {
1530      position: popper.position
1531    };
1532
1533    var offsets = getRoundedOffsets(data, window.devicePixelRatio < 2 || !isFirefox);
1534
1535    var sideA = x === 'bottom' ? 'top' : 'bottom';
1536    var sideB = y === 'right' ? 'left' : 'right';
1537
1538    // if gpuAcceleration is set to `true` and transform is supported,
1539    //  we use `translate3d` to apply the position to the popper we
1540    // automatically use the supported prefixed version if needed
1541    var prefixedProperty = getSupportedPropertyName('transform');
1542
1543    // now, let's make a step back and look at this code closely (wtf?)
1544    // If the content of the popper grows once it's been positioned, it
1545    // may happen that the popper gets misplaced because of the new content
1546    // overflowing its reference element
1547    // To avoid this problem, we provide two options (x and y), which allow
1548    // the consumer to define the offset origin.
1549    // If we position a popper on top of a reference element, we can set
1550    // `x` to `top` to make the popper grow towards its top instead of
1551    // its bottom.
1552    var left = void 0,
1553        top = void 0;
1554    if (sideA === 'bottom') {
1555      // when offsetParent is <html> the positioning is relative to the bottom of the screen (excluding the scrollbar)
1556      // and not the bottom of the html element
1557      if (offsetParent.nodeName === 'HTML') {
1558        top = -offsetParent.clientHeight + offsets.bottom;
1559      } else {
1560        top = -offsetParentRect.height + offsets.bottom;
1561      }
1562    } else {
1563      top = offsets.top;
1564    }
1565    if (sideB === 'right') {
1566      if (offsetParent.nodeName === 'HTML') {
1567        left = -offsetParent.clientWidth + offsets.right;
1568      } else {
1569        left = -offsetParentRect.width + offsets.right;
1570      }
1571    } else {
1572      left = offsets.left;
1573    }
1574    if (gpuAcceleration && prefixedProperty) {
1575      styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';
1576      styles[sideA] = 0;
1577      styles[sideB] = 0;
1578      styles.willChange = 'transform';
1579    } else {
1580      // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
1581      var invertTop = sideA === 'bottom' ? -1 : 1;
1582      var invertLeft = sideB === 'right' ? -1 : 1;
1583      styles[sideA] = top * invertTop;
1584      styles[sideB] = left * invertLeft;
1585      styles.willChange = sideA + ', ' + sideB;
1586    }
1587
1588    // Attributes
1589    var attributes = {
1590      'x-placement': data.placement
1591    };
1592
1593    // Update `data` attributes, styles and arrowStyles
1594    data.attributes = _extends$1({}, attributes, data.attributes);
1595    data.styles = _extends$1({}, styles, data.styles);
1596    data.arrowStyles = _extends$1({}, data.offsets.arrow, data.arrowStyles);
1597
1598    return data;
1599  }
1600
1601  /**
1602   * Helper used to know if the given modifier depends from another one.<br />
1603   * It checks if the needed modifier is listed and enabled.
1604   * @method
1605   * @memberof Popper.Utils
1606   * @param {Array} modifiers - list of modifiers
1607   * @param {String} requestingName - name of requesting modifier
1608   * @param {String} requestedName - name of requested modifier
1609   * @returns {Boolean}
1610   */
1611  function isModifierRequired(modifiers, requestingName, requestedName) {
1612    var requesting = find(modifiers, function (_ref) {
1613      var name = _ref.name;
1614      return name === requestingName;
1615    });
1616
1617    var isRequired = !!requesting && modifiers.some(function (modifier) {
1618      return modifier.name === requestedName && modifier.enabled && modifier.order < requesting.order;
1619    });
1620
1621    if (!isRequired) {
1622      var _requesting = '`' + requestingName + '`';
1623      var requested = '`' + requestedName + '`';
1624      console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');
1625    }
1626    return isRequired;
1627  }
1628
1629  /**
1630   * @function
1631   * @memberof Modifiers
1632   * @argument {Object} data - The data object generated by update method
1633   * @argument {Object} options - Modifiers configuration and options
1634   * @returns {Object} The data object, properly modified
1635   */
1636  function arrow(data, options) {
1637    var _data$offsets$arrow;
1638
1639    // arrow depends on keepTogether in order to work
1640    if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
1641      return data;
1642    }
1643
1644    var arrowElement = options.element;
1645
1646    // if arrowElement is a string, suppose it's a CSS selector
1647    if (typeof arrowElement === 'string') {
1648      arrowElement = data.instance.popper.querySelector(arrowElement);
1649
1650      // if arrowElement is not found, don't run the modifier
1651      if (!arrowElement) {
1652        return data;
1653      }
1654    } else {
1655      // if the arrowElement isn't a query selector we must check that the
1656      // provided DOM node is child of its popper node
1657      if (!data.instance.popper.contains(arrowElement)) {
1658        console.warn('WARNING: `arrow.element` must be child of its popper element!');
1659        return data;
1660      }
1661    }
1662
1663    var placement = data.placement.split('-')[0];
1664    var _data$offsets = data.offsets,
1665        popper = _data$offsets.popper,
1666        reference = _data$offsets.reference;
1667
1668    var isVertical = ['left', 'right'].indexOf(placement) !== -1;
1669
1670    var len = isVertical ? 'height' : 'width';
1671    var sideCapitalized = isVertical ? 'Top' : 'Left';
1672    var side = sideCapitalized.toLowerCase();
1673    var altSide = isVertical ? 'left' : 'top';
1674    var opSide = isVertical ? 'bottom' : 'right';
1675    var arrowElementSize = getOuterSizes(arrowElement)[len];
1676
1677    //
1678    // extends keepTogether behavior making sure the popper and its
1679    // reference have enough pixels in conjunction
1680    //
1681
1682    // top/left side
1683    if (reference[opSide] - arrowElementSize < popper[side]) {
1684      data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
1685    }
1686    // bottom/right side
1687    if (reference[side] + arrowElementSize > popper[opSide]) {
1688      data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
1689    }
1690    data.offsets.popper = getClientRect(data.offsets.popper);
1691
1692    // compute center of the popper
1693    var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
1694
1695    // Compute the sideValue using the updated popper offsets
1696    // take popper margin in account because we don't have this info available
1697    var css = getStyleComputedProperty(data.instance.popper);
1698    var popperMarginSide = parseFloat(css['margin' + sideCapitalized]);
1699    var popperBorderSide = parseFloat(css['border' + sideCapitalized + 'Width']);
1700    var sideValue = center - data.offsets.popper[side] - popperMarginSide - popperBorderSide;
1701
1702    // prevent arrowElement from being placed not contiguously to its popper
1703    sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
1704
1705    data.arrowElement = arrowElement;
1706    data.offsets.arrow = (_data$offsets$arrow = {}, defineProperty(_data$offsets$arrow, side, Math.round(sideValue)), defineProperty(_data$offsets$arrow, altSide, ''), _data$offsets$arrow);
1707
1708    return data;
1709  }
1710
1711  /**
1712   * Get the opposite placement variation of the given one
1713   * @method
1714   * @memberof Popper.Utils
1715   * @argument {String} placement variation
1716   * @returns {String} flipped placement variation
1717   */
1718  function getOppositeVariation(variation) {
1719    if (variation === 'end') {
1720      return 'start';
1721    } else if (variation === 'start') {
1722      return 'end';
1723    }
1724    return variation;
1725  }
1726
1727  /**
1728   * List of accepted placements to use as values of the `placement` option.<br />
1729   * Valid placements are:
1730   * - `auto`
1731   * - `top`
1732   * - `right`
1733   * - `bottom`
1734   * - `left`
1735   *
1736   * Each placement can have a variation from this list:
1737   * - `-start`
1738   * - `-end`
1739   *
1740   * Variations are interpreted easily if you think of them as the left to right
1741   * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`
1742   * is right.<br />
1743   * Vertically (`left` and `right`), `start` is top and `end` is bottom.
1744   *
1745   * Some valid examples are:
1746   * - `top-end` (on top of reference, right aligned)
1747   * - `right-start` (on right of reference, top aligned)
1748   * - `bottom` (on bottom, centered)
1749   * - `auto-end` (on the side with more space available, alignment depends by placement)
1750   *
1751   * @static
1752   * @type {Array}
1753   * @enum {String}
1754   * @readonly
1755   * @method placements
1756   * @memberof Popper
1757   */
1758  var placements = ['auto-start', 'auto', 'auto-end', 'top-start', 'top', 'top-end', 'right-start', 'right', 'right-end', 'bottom-end', 'bottom', 'bottom-start', 'left-end', 'left', 'left-start'];
1759
1760  // Get rid of `auto` `auto-start` and `auto-end`
1761  var validPlacements = placements.slice(3);
1762
1763  /**
1764   * Given an initial placement, returns all the subsequent placements
1765   * clockwise (or counter-clockwise).
1766   *
1767   * @method
1768   * @memberof Popper.Utils
1769   * @argument {String} placement - A valid placement (it accepts variations)
1770   * @argument {Boolean} counter - Set to true to walk the placements counterclockwise
1771   * @returns {Array} placements including their variations
1772   */
1773  function clockwise(placement) {
1774    var counter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
1775
1776    var index = validPlacements.indexOf(placement);
1777    var arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));
1778    return counter ? arr.reverse() : arr;
1779  }
1780
1781  var BEHAVIORS = {
1782    FLIP: 'flip',
1783    CLOCKWISE: 'clockwise',
1784    COUNTERCLOCKWISE: 'counterclockwise'
1785  };
1786
1787  /**
1788   * @function
1789   * @memberof Modifiers
1790   * @argument {Object} data - The data object generated by update method
1791   * @argument {Object} options - Modifiers configuration and options
1792   * @returns {Object} The data object, properly modified
1793   */
1794  function flip(data, options) {
1795    // if `inner` modifier is enabled, we can't use the `flip` modifier
1796    if (isModifierEnabled(data.instance.modifiers, 'inner')) {
1797      return data;
1798    }
1799
1800    if (data.flipped && data.placement === data.originalPlacement) {
1801      // seems like flip is trying to loop, probably there's not enough space on any of the flippable sides
1802      return data;
1803    }
1804
1805    var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement, data.positionFixed);
1806
1807    var placement = data.placement.split('-')[0];
1808    var placementOpposite = getOppositePlacement(placement);
1809    var variation = data.placement.split('-')[1] || '';
1810
1811    var flipOrder = [];
1812
1813    switch (options.behavior) {
1814      case BEHAVIORS.FLIP:
1815        flipOrder = [placement, placementOpposite];
1816        break;
1817      case BEHAVIORS.CLOCKWISE:
1818        flipOrder = clockwise(placement);
1819        break;
1820      case BEHAVIORS.COUNTERCLOCKWISE:
1821        flipOrder = clockwise(placement, true);
1822        break;
1823      default:
1824        flipOrder = options.behavior;
1825    }
1826
1827    flipOrder.forEach(function (step, index) {
1828      if (placement !== step || flipOrder.length === index + 1) {
1829        return data;
1830      }
1831
1832      placement = data.placement.split('-')[0];
1833      placementOpposite = getOppositePlacement(placement);
1834
1835      var popperOffsets = data.offsets.popper;
1836      var refOffsets = data.offsets.reference;
1837
1838      // using floor because the reference offsets may contain decimals we are not going to consider here
1839      var floor = Math.floor;
1840      var overlapsRef = placement === 'left' && floor(popperOffsets.right) > floor(refOffsets.left) || placement === 'right' && floor(popperOffsets.left) < floor(refOffsets.right) || placement === 'top' && floor(popperOffsets.bottom) > floor(refOffsets.top) || placement === 'bottom' && floor(popperOffsets.top) < floor(refOffsets.bottom);
1841
1842      var overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);
1843      var overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);
1844      var overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);
1845      var overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);
1846
1847      var overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;
1848
1849      // flip the variation if required
1850      var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1851
1852      // flips variation if reference element overflows boundaries
1853      var flippedVariationByRef = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);
1854
1855      // flips variation if popper content overflows boundaries
1856      var flippedVariationByContent = !!options.flipVariationsByContent && (isVertical && variation === 'start' && overflowsRight || isVertical && variation === 'end' && overflowsLeft || !isVertical && variation === 'start' && overflowsBottom || !isVertical && variation === 'end' && overflowsTop);
1857
1858      var flippedVariation = flippedVariationByRef || flippedVariationByContent;
1859
1860      if (overlapsRef || overflowsBoundaries || flippedVariation) {
1861        // this boolean to detect any flip loop
1862        data.flipped = true;
1863
1864        if (overlapsRef || overflowsBoundaries) {
1865          placement = flipOrder[index + 1];
1866        }
1867
1868        if (flippedVariation) {
1869          variation = getOppositeVariation(variation);
1870        }
1871
1872        data.placement = placement + (variation ? '-' + variation : '');
1873
1874        // this object contains `position`, we want to preserve it along with
1875        // any additional property we may add in the future
1876        data.offsets.popper = _extends$1({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));
1877
1878        data = runModifiers(data.instance.modifiers, data, 'flip');
1879      }
1880    });
1881    return data;
1882  }
1883
1884  /**
1885   * @function
1886   * @memberof Modifiers
1887   * @argument {Object} data - The data object generated by update method
1888   * @argument {Object} options - Modifiers configuration and options
1889   * @returns {Object} The data object, properly modified
1890   */
1891  function keepTogether(data) {
1892    var _data$offsets = data.offsets,
1893        popper = _data$offsets.popper,
1894        reference = _data$offsets.reference;
1895
1896    var placement = data.placement.split('-')[0];
1897    var floor = Math.floor;
1898    var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1899    var side = isVertical ? 'right' : 'bottom';
1900    var opSide = isVertical ? 'left' : 'top';
1901    var measurement = isVertical ? 'width' : 'height';
1902
1903    if (popper[side] < floor(reference[opSide])) {
1904      data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
1905    }
1906    if (popper[opSide] > floor(reference[side])) {
1907      data.offsets.popper[opSide] = floor(reference[side]);
1908    }
1909
1910    return data;
1911  }
1912
1913  /**
1914   * Converts a string containing value + unit into a px value number
1915   * @function
1916   * @memberof {modifiers~offset}
1917   * @private
1918   * @argument {String} str - Value + unit string
1919   * @argument {String} measurement - `height` or `width`
1920   * @argument {Object} popperOffsets
1921   * @argument {Object} referenceOffsets
1922   * @returns {Number|String}
1923   * Value in pixels, or original string if no values were extracted
1924   */
1925  function toValue(str, measurement, popperOffsets, referenceOffsets) {
1926    // separate value from unit
1927    var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
1928    var value = +split[1];
1929    var unit = split[2];
1930
1931    // If it's not a number it's an operator, I guess
1932    if (!value) {
1933      return str;
1934    }
1935
1936    if (unit.indexOf('%') === 0) {
1937      var element = void 0;
1938      switch (unit) {
1939        case '%p':
1940          element = popperOffsets;
1941          break;
1942        case '%':
1943        case '%r':
1944        default:
1945          element = referenceOffsets;
1946      }
1947
1948      var rect = getClientRect(element);
1949      return rect[measurement] / 100 * value;
1950    } else if (unit === 'vh' || unit === 'vw') {
1951      // if is a vh or vw, we calculate the size based on the viewport
1952      var size = void 0;
1953      if (unit === 'vh') {
1954        size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
1955      } else {
1956        size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
1957      }
1958      return size / 100 * value;
1959    } else {
1960      // if is an explicit pixel unit, we get rid of the unit and keep the value
1961      // if is an implicit unit, it's px, and we return just the value
1962      return value;
1963    }
1964  }
1965
1966  /**
1967   * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
1968   * @function
1969   * @memberof {modifiers~offset}
1970   * @private
1971   * @argument {String} offset
1972   * @argument {Object} popperOffsets
1973   * @argument {Object} referenceOffsets
1974   * @argument {String} basePlacement
1975   * @returns {Array} a two cells array with x and y offsets in numbers
1976   */
1977  function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
1978    var offsets = [0, 0];
1979
1980    // Use height if placement is left or right and index is 0 otherwise use width
1981    // in this way the first offset will use an axis and the second one
1982    // will use the other one
1983    var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
1984
1985    // Split the offset string to obtain a list of values and operands
1986    // The regex addresses values with the plus or minus sign in front (+10, -20, etc)
1987    var fragments = offset.split(/(\+|\-)/).map(function (frag) {
1988      return frag.trim();
1989    });
1990
1991    // Detect if the offset string contains a pair of values or a single one
1992    // they could be separated by comma or space
1993    var divider = fragments.indexOf(find(fragments, function (frag) {
1994      return frag.search(/,|\s/) !== -1;
1995    }));
1996
1997    if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
1998      console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
1999    }
2000
2001    // If divider is found, we divide the list of values and operands to divide
2002    // them by ofset X and Y.
2003    var splitRegex = /\s*,\s*|\s+/;
2004    var ops = divider !== -1 ? [fragments.slice(0, divider).concat([fragments[divider].split(splitRegex)[0]]), [fragments[divider].split(splitRegex)[1]].concat(fragments.slice(divider + 1))] : [fragments];
2005
2006    // Convert the values with units to absolute pixels to allow our computations
2007    ops = ops.map(function (op, index) {
2008      // Most of the units rely on the orientation of the popper
2009      var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
2010      var mergeWithPrevious = false;
2011      return op
2012      // This aggregates any `+` or `-` sign that aren't considered operators
2013      // e.g.: 10 + +5 => [10, +, +5]
2014      .reduce(function (a, b) {
2015        if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
2016          a[a.length - 1] = b;
2017          mergeWithPrevious = true;
2018          return a;
2019        } else if (mergeWithPrevious) {
2020          a[a.length - 1] += b;
2021          mergeWithPrevious = false;
2022          return a;
2023        } else {
2024          return a.concat(b);
2025        }
2026      }, [])
2027      // Here we convert the string values into number values (in px)
2028      .map(function (str) {
2029        return toValue(str, measurement, popperOffsets, referenceOffsets);
2030      });
2031    });
2032
2033    // Loop trough the offsets arrays and execute the operations
2034    ops.forEach(function (op, index) {
2035      op.forEach(function (frag, index2) {
2036        if (isNumeric(frag)) {
2037          offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
2038        }
2039      });
2040    });
2041    return offsets;
2042  }
2043
2044  /**
2045   * @function
2046   * @memberof Modifiers
2047   * @argument {Object} data - The data object generated by update method
2048   * @argument {Object} options - Modifiers configuration and options
2049   * @argument {Number|String} options.offset=0
2050   * The offset value as described in the modifier description
2051   * @returns {Object} The data object, properly modified
2052   */
2053  function offset(data, _ref) {
2054    var offset = _ref.offset;
2055    var placement = data.placement,
2056        _data$offsets = data.offsets,
2057        popper = _data$offsets.popper,
2058        reference = _data$offsets.reference;
2059
2060    var basePlacement = placement.split('-')[0];
2061
2062    var offsets = void 0;
2063    if (isNumeric(+offset)) {
2064      offsets = [+offset, 0];
2065    } else {
2066      offsets = parseOffset(offset, popper, reference, basePlacement);
2067    }
2068
2069    if (basePlacement === 'left') {
2070      popper.top += offsets[0];
2071      popper.left -= offsets[1];
2072    } else if (basePlacement === 'right') {
2073      popper.top += offsets[0];
2074      popper.left += offsets[1];
2075    } else if (basePlacement === 'top') {
2076      popper.left += offsets[0];
2077      popper.top -= offsets[1];
2078    } else if (basePlacement === 'bottom') {
2079      popper.left += offsets[0];
2080      popper.top += offsets[1];
2081    }
2082
2083    data.popper = popper;
2084    return data;
2085  }
2086
2087  /**
2088   * @function
2089   * @memberof Modifiers
2090   * @argument {Object} data - The data object generated by `update` method
2091   * @argument {Object} options - Modifiers configuration and options
2092   * @returns {Object} The data object, properly modified
2093   */
2094  function preventOverflow(data, options) {
2095    var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);
2096
2097    // If offsetParent is the reference element, we really want to
2098    // go one step up and use the next offsetParent as reference to
2099    // avoid to make this modifier completely useless and look like broken
2100    if (data.instance.reference === boundariesElement) {
2101      boundariesElement = getOffsetParent(boundariesElement);
2102    }
2103
2104    // NOTE: DOM access here
2105    // resets the popper's position so that the document size can be calculated excluding
2106    // the size of the popper element itself
2107    var transformProp = getSupportedPropertyName('transform');
2108    var popperStyles = data.instance.popper.style; // assignment to help minification
2109    var top = popperStyles.top,
2110        left = popperStyles.left,
2111        transform = popperStyles[transformProp];
2112
2113    popperStyles.top = '';
2114    popperStyles.left = '';
2115    popperStyles[transformProp] = '';
2116
2117    var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement, data.positionFixed);
2118
2119    // NOTE: DOM access here
2120    // restores the original style properties after the offsets have been computed
2121    popperStyles.top = top;
2122    popperStyles.left = left;
2123    popperStyles[transformProp] = transform;
2124
2125    options.boundaries = boundaries;
2126
2127    var order = options.priority;
2128    var popper = data.offsets.popper;
2129
2130    var check = {
2131      primary: function primary(placement) {
2132        var value = popper[placement];
2133        if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
2134          value = Math.max(popper[placement], boundaries[placement]);
2135        }
2136        return defineProperty({}, placement, value);
2137      },
2138      secondary: function secondary(placement) {
2139        var mainSide = placement === 'right' ? 'left' : 'top';
2140        var value = popper[mainSide];
2141        if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
2142          value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
2143        }
2144        return defineProperty({}, mainSide, value);
2145      }
2146    };
2147
2148    order.forEach(function (placement) {
2149      var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
2150      popper = _extends$1({}, popper, check[side](placement));
2151    });
2152
2153    data.offsets.popper = popper;
2154
2155    return data;
2156  }
2157
2158  /**
2159   * @function
2160   * @memberof Modifiers
2161   * @argument {Object} data - The data object generated by `update` method
2162   * @argument {Object} options - Modifiers configuration and options
2163   * @returns {Object} The data object, properly modified
2164   */
2165  function shift(data) {
2166    var placement = data.placement;
2167    var basePlacement = placement.split('-')[0];
2168    var shiftvariation = placement.split('-')[1];
2169
2170    // if shift shiftvariation is specified, run the modifier
2171    if (shiftvariation) {
2172      var _data$offsets = data.offsets,
2173          reference = _data$offsets.reference,
2174          popper = _data$offsets.popper;
2175
2176      var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
2177      var side = isVertical ? 'left' : 'top';
2178      var measurement = isVertical ? 'width' : 'height';
2179
2180      var shiftOffsets = {
2181        start: defineProperty({}, side, reference[side]),
2182        end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])
2183      };
2184
2185      data.offsets.popper = _extends$1({}, popper, shiftOffsets[shiftvariation]);
2186    }
2187
2188    return data;
2189  }
2190
2191  /**
2192   * @function
2193   * @memberof Modifiers
2194   * @argument {Object} data - The data object generated by update method
2195   * @argument {Object} options - Modifiers configuration and options
2196   * @returns {Object} The data object, properly modified
2197   */
2198  function hide(data) {
2199    if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
2200      return data;
2201    }
2202
2203    var refRect = data.offsets.reference;
2204    var bound = find(data.instance.modifiers, function (modifier) {
2205      return modifier.name === 'preventOverflow';
2206    }).boundaries;
2207
2208    if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
2209      // Avoid unnecessary DOM access if visibility hasn't changed
2210      if (data.hide === true) {
2211        return data;
2212      }
2213
2214      data.hide = true;
2215      data.attributes['x-out-of-boundaries'] = '';
2216    } else {
2217      // Avoid unnecessary DOM access if visibility hasn't changed
2218      if (data.hide === false) {
2219        return data;
2220      }
2221
2222      data.hide = false;
2223      data.attributes['x-out-of-boundaries'] = false;
2224    }
2225
2226    return data;
2227  }
2228
2229  /**
2230   * @function
2231   * @memberof Modifiers
2232   * @argument {Object} data - The data object generated by `update` method
2233   * @argument {Object} options - Modifiers configuration and options
2234   * @returns {Object} The data object, properly modified
2235   */
2236  function inner(data) {
2237    var placement = data.placement;
2238    var basePlacement = placement.split('-')[0];
2239    var _data$offsets = data.offsets,
2240        popper = _data$offsets.popper,
2241        reference = _data$offsets.reference;
2242
2243    var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;
2244
2245    var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
2246
2247    popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
2248
2249    data.placement = getOppositePlacement(placement);
2250    data.offsets.popper = getClientRect(popper);
2251
2252    return data;
2253  }
2254
2255  /**
2256   * Modifier function, each modifier can have a function of this type assigned
2257   * to its `fn` property.<br />
2258   * These functions will be called on each update, this means that you must
2259   * make sure they are performant enough to avoid performance bottlenecks.
2260   *
2261   * @function ModifierFn
2262   * @argument {dataObject} data - The data object generated by `update` method
2263   * @argument {Object} options - Modifiers configuration and options
2264   * @returns {dataObject} The data object, properly modified
2265   */
2266
2267  /**
2268   * Modifiers are plugins used to alter the behavior of your poppers.<br />
2269   * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
2270   * needed by the library.
2271   *
2272   * Usually you don't want to override the `order`, `fn` and `onLoad` props.
2273   * All the other properties are configurations that could be tweaked.
2274   * @namespace modifiers
2275   */
2276  var modifiers = {
2277    /**
2278     * Modifier used to shift the popper on the start or end of its reference
2279     * element.<br />
2280     * It will read the variation of the `placement` property.<br />
2281     * It can be one either `-end` or `-start`.
2282     * @memberof modifiers
2283     * @inner
2284     */
2285    shift: {
2286      /** @prop {number} order=100 - Index used to define the order of execution */
2287      order: 100,
2288      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2289      enabled: true,
2290      /** @prop {ModifierFn} */
2291      fn: shift
2292    },
2293
2294    /**
2295     * The `offset` modifier can shift your popper on both its axis.
2296     *
2297     * It accepts the following units:
2298     * - `px` or unit-less, interpreted as pixels
2299     * - `%` or `%r`, percentage relative to the length of the reference element
2300     * - `%p`, percentage relative to the length of the popper element
2301     * - `vw`, CSS viewport width unit
2302     * - `vh`, CSS viewport height unit
2303     *
2304     * For length is intended the main axis relative to the placement of the popper.<br />
2305     * This means that if the placement is `top` or `bottom`, the length will be the
2306     * `width`. In case of `left` or `right`, it will be the `height`.
2307     *
2308     * You can provide a single value (as `Number` or `String`), or a pair of values
2309     * as `String` divided by a comma or one (or more) white space

2582      fn: applyStyle,
2583      /** @prop {Function} */
2584      onLoad: applyStyleOnLoad,
2585      /**
2586       * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
2587       * @prop {Boolean} gpuAcceleration=true
2588       * If true, it uses the CSS 3D transformation to position the popper.
2589       * Otherwise, it will use the `top` and `left` properties
2590       */
2591      gpuAcceleration: undefined
2592    }
2593  };
2594
2595  /**
2596   * The `dataObject` is an object containing all the information used by Popper.js.
2597   * This object is passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
2598   * @name dataObject
2599   * @property {Object} data.instance The Popper.js instance
2600   * @property {String} data.placement Placement applied to popper
2601   * @property {String} data.originalPlacement Placement originally defined on init
2602   * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
2603   * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper
2604   * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
2605   * @property {Object} data.styles Any CSS property defined here will be applied to the popper. It expects the JavaScript nomenclature (eg. `marginBottom`)
2606   * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow. It expects the JavaScript nomenclature (eg. `marginBottom`)
2607   * @property {Object} data.boundaries Offsets of the popper boundaries
2608   * @property {Object} data.offsets The measurements of popper, reference and arrow elements
2609   * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
2610   * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
2611   * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
2612   */
2613
2614  /**
2615   * Default options provided to Popper.js constructor.<br />
2616   * These can be overridden using the `options` argument of Popper.js.<br />
2617   * To override an option, simply pass an object with the same
2618   * structure of the `options` object, as the 3rd argument. For example:
2619   * ```
2620   * new Popper(ref, pop, {
2621   *   modifiers: {
2622   *     preventOverflow: { enabled: false }
2623   *   }
2624   * })
2625   * ```
2626   * @type {Object}
2627   * @static
2628   * @memberof Popper
2629   */
2630  var Defaults = {
2631    /**
2632     * Popper's placement.
2633     * @prop {Popper.placements} placement='bottom'
2634     */
2635    placement: 'bottom',
2636
2637    /**
2638     * Set this to true if you want popper to position it self in 'fixed' mode
2639     * @prop {Boolean} positionFixed=false
2640     */
2641    positionFixed: false,
2642
2643    /**
2644     * Whether events (resize, scroll) are initially enabled.
2645     * @prop {Boolean} eventsEnabled=true
2646     */
2647    eventsEnabled: true,
2648
2649    /**
2650     * Set to true if you want to automatically remove the popper when
2651     * you call the `destroy` method.
2652     * @prop {Boolean} removeOnDestroy=false
2653     */
2654    removeOnDestroy: false,
2655
2656    /**
2657     * Callback called when the popper is created.<br />
2658     * By default, it is set to no-op.<br />
2659     * Access Popper.js instance with `data.instance`.
2660     * @prop {onCreate}
2661     */
2662    onCreate: function onCreate() {},
2663
2664    /**
2665     * Callback called when the popper is updated. This callback is not called
2666     * on the initialization/creation of the popper, but only on subsequent
2667     * updates.<br />
2668     * By default, it is set to no-op.<br />
2669     * Access Popper.js instance with `data.instance`.
2670     * @prop {onUpdate}
2671     */
2672    onUpdate: function onUpdate() {},
2673
2674    /**
2675     * List of modifiers used to modify the offsets before they are applied to the popper.
2676     * They provide most of the functionalities of Popper.js.
2677     * @prop {modifiers}
2678     */
2679    modifiers: modifiers
2680  };
2681
2682  /**
2683   * @callback onCreate
2684   * @param {dataObject} data
2685   */
2686
2687  /**
2688   * @callback onUpdate
2689   * @param {dataObject} data
2690   */
2691
2692  // Utils
2693  // Methods
2694  var Popper = function () {
2695    /**
2696     * Creates a new Popper.js instance.
2697     * @class Popper
2698     * @param {Element|referenceObject} reference - The reference element used to position the popper
2699     * @param {Element} popper - The HTML / XML element used as the popper
2700     * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
2701     * @return {Object} instance - The generated Popper.js instance
2702     */
2703    function Popper(reference, popper) {
2704      var _this = this;
2705
2706      var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
2707      classCallCheck(this, Popper);
2708
2709      this.scheduleUpdate = function () {
2710        return requestAnimationFrame(_this.update);
2711      };
2712
2713      // make update() debounced, so that it only runs at most once-per-tick
2714      this.update = debounce(this.update.bind(this));
2715
2716      // with {} we create a new object with the options inside it
2717      this.options = _extends$1({}, Popper.Defaults, options);
2718
2719      // init state
2720      this.state = {