text: /**!
   * @fileOverview Kickass library to create and place poppers near their reference elements.
   * @version 1.11.1
   * @license
   * Copyright (c) 2016 Federico Zivolo and contributors
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  (function (global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
          typeof define === 'function' && define.amd ? define(factory) :
              (global.Popper = factory());
  }(this, (function () {
      'use strict';
  
      var nativeHints = ['native code', '[object MutationObserverConstructor]'];
  
      /**
       * Determine if a function is implemented natively (as opposed to a polyfill).
       * @method
       * @memberof Popper.Utils
       * @argument {Function | undefined} fn the function to check
       * @returns {Boolean}
       */
      var isNative = (function (fn) {
          return nativeHints.some(function (hint) {
              return (fn || '').toString().indexOf(hint) > -1;
          });
      });
  
      var isBrowser = typeof window !== 'undefined';
      var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
      var timeoutDuration = 0;
      for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
          if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
              timeoutDuration = 1;
              break;
          }
      }
  
      function microtaskDebounce(fn) {
          var scheduled = false;
          var i = 0;
          var elem = document.createElement('span');
  
          // MutationObserver provides a mechanism for scheduling microtasks, which
          // are scheduled *before* the next task. This gives us a way to debounce
          // a function but ensure it's called *before* the next paint.
          var observer = new MutationObserver(function () {
              fn();
              scheduled = false;
          });
  
          observer.observe(elem, { attributes: true });
  
          return function () {
              if (!scheduled) {
                  scheduled = true;
                  elem.setAttribute('x-index', i);
                  i = i + 1; // don't use compund (+=) because it doesn't get optimized in V8
              }
          };
      }
  
      function taskDebounce(fn) {
          var scheduled = false;
          return function () {
              if (!scheduled) {
                  scheduled = true;
                  setTimeout(function () {
                      scheduled = false;
                      fn();
                  }, timeoutDuration);
              }
          };
      }
  
      // It's common for MutationObserver polyfills to be seen in the wild, however
      // these rely on Mutation Events which only occur when an element is connected
      // to the DOM. The algorithm used in this module does not use a connected element,
      // and so we must ensure that a *native* MutationObserver is available.
      var supportsNativeMutationObserver = isBrowser && isNative(window.MutationObserver);
  
      /**
      * Create a debounced version of a method, that's asynchronously deferred
      * but called in the minimum time possible.
      *
      * @method
      * @memberof Popper.Utils
      * @argument {Function} fn
      * @returns {Function}
      */
      var debounce = supportsNativeMutationObserver ? microtaskDebounce : taskDebounce;
  
      /**
       * Check if the given variable is a function
       * @method
       * @memberof Popper.Utils
       * @argument {Any} functionToCheck - variable to check
       * @returns {Boolean} answer to: is a function?
       */
      function isFunction(functionToCheck) {
          var getType = {};
          return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
      }
  
      /**
       * Get CSS computed property of the given element
       * @method
       * @memberof Popper.Utils
       * @argument {Eement} element
       * @argument {String} property
       */
      function getStyleComputedProperty(element, property) {
          if (element.nodeType !== 1) {
              return [];
          }
          // NOTE: 1 DOM access here
          var css = window.getComputedStyle(element, null);
          return property ? css[property] : css;
      }
  
      /**
       * Returns the parentNode or the host of the element
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element
       * @returns {Element} parent
       */
      function getParentNode(element) {
          if (element.nodeName === 'HTML') {
              return element;
          }
          return element.parentNode || element.host;
      }
  
      /**
       * Returns the scrolling parent of the given element
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element
       * @returns {Element} scroll parent
       */
      function getScrollParent(element) {
          // Return body, `getScroll` will take care to get the correct `scrollTop` from it
          if (!element || ['HTML', 'BODY', '#document'].indexOf(element.nodeName) !== -1) {
              return window.document.body;
          }
  
          // Firefox want us to check `-x` and `-y` variations as well
  
          var _getStyleComputedProp = getStyleComputedProperty(element),
              overflow = _getStyleComputedProp.overflow,
              overflowX = _getStyleComputedProp.overflowX,
              overflowY = _getStyleComputedProp.overflowY;
  
          if (/(auto|scroll)/.test(overflow + overflowY + overflowX)) {
              return element;
          }
  
          return getScrollParent(getParentNode(element));
      }
  
      /**
       * Returns the offset parent of the given element
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element
       * @returns {Element} offset parent
       */
      function getOffsetParent(element) {
          // NOTE: 1 DOM access here
          var offsetParent = element && element.offsetParent;
          var nodeName = offsetParent && offsetParent.nodeName;
  
          if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
              return window.document.documentElement;
          }
  
          // .offsetParent will return the closest TD or TABLE in case
          // no offsetParent is present, I hate this job...
          if (['TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 && getStyleComputedProperty(offsetParent, 'position') === 'static') {
              return getOffsetParent(offsetParent);
          }
  
          return offsetParent;
      }
  
      function isOffsetContainer(element) {
          var nodeName = element.nodeName;
  
          if (nodeName === 'BODY') {
              return false;
          }
          return nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element;
      }
  
      /**
       * Finds the root node (document, shadowDOM root) of the given element
       * @method
       * @memberof Popper.Utils
       * @argument {Element} node
       * @returns {Element} root node
       */
      function getRoot(node) {
          if (node.parentNode !== null) {
              return getRoot(node.parentNode);
          }
  
          return node;
      }
  
      /**
       * Finds the offset parent common to the two provided nodes
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element1
       * @argument {Element} element2
       * @returns {Element} common offset parent
       */
      function findCommonOffsetParent(element1, element2) {
          // This check is needed to avoid errors in case one of the elements isn't defined for any reason
          if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
              return window.document.documentElement;
          }
  
          // Here we make sure to give as "start" the element that comes first in the DOM
          var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
          var start = order ? element1 : element2;
          var end = order ? element2 : element1;
  
          // Get common ancestor container
          var range = document.createRange();
          range.setStart(start, 0);
          range.setEnd(end, 0);
          var commonAncestorContainer = range.commonAncestorContainer;
  
          // Both nodes are inside #document
  
          if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
              if (isOffsetContainer(commonAncestorContainer)) {
                  return commonAncestorContainer;
              }
  
              return getOffsetParent(commonAncestorContainer);
          }
  
          // one of the nodes is inside shadowDOM, find which one
          var element1root = getRoot(element1);
          if (element1root.host) {
              return findCommonOffsetParent(element1root.host, element2);
          } else {
              return findCommonOffsetParent(element1, getRoot(element2).host);
          }
      }
  
      /**
       * Gets the scroll value of the given element in the given side (top and left)
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element
       * @argument {String} side `top` or `left`
       * @returns {number} amount of scrolled pixels
       */
      function getScroll(element) {
          var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';
  
          var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
          var nodeName = element.nodeName;
  
          if (nodeName === 'BODY' || nodeName === 'HTML') {
              var html = window.document.documentElement;
              var scrollingElement = window.document.scrollingElement || html;
              return scrollingElement[upperSide];
          }
  
          return element[upperSide];
      }
  
      /*
       * Sum or subtract the element scroll values (left and top) from a given rect object
       * @method
       * @memberof Popper.Utils
       * @param {Object} rect - Rect object you want to change
       * @param {HTMLElement} element - The element from the function reads the scroll values
       * @param {Boolean} subtract - set to true if you want to subtract the scroll values
       * @return {Object} rect - The modifier rect object
       */
      function includeScroll(rect, element) {
          var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  
          var scrollTop = getScroll(element, 'top');
          var scrollLeft = getScroll(element, 'left');
          var modifier = subtract ? -1 : 1;
          rect.top += scrollTop * modifier;
          rect.bottom += scrollTop * modifier;
          rect.left += scrollLeft * modifier;
          rect.right += scrollLeft * modifier;
          return rect;
      }
  
      /*
       * Helper to detect borders of a given element
       * @method
       * @memberof Popper.Utils
       * @param {CSSStyleDeclaration} styles
       * Result of `getStyleComputedProperty` on the given element
       * @param {String} axis - `x` or `y`
       * @return {number} borders - The borders size of the given axis
       */
  
      function getBordersSize(styles, axis) {
          var sideA = axis === 'x' ? 'Left' : 'Top';
          var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
  
          return +styles['border' + sideA + 'Width'].split('px')[0] + +styles['border' + sideB + 'Width'].split('px')[0];
      }
  
      /**
       * Tells if you are running Internet Explorer 10
       * @method
       * @memberof Popper.Utils
       * @returns {Boolean} isIE10
       */
      var isIE10 = undefined;
  
      var isIE10$1 = function () {
          if (isIE10 === undefined) {
              isIE10 = navigator.appVersion.indexOf('MSIE 10') !== -1;
          }
          return isIE10;
      };
  
      function getSize(axis, body, html, computedStyle) {
          return Math.max(body['offset' + axis], html['client' + axis], html['offset' + axis], isIE10$1() ? html['offset' + axis] + computedStyle['margin' + (axis === 'Height' ? 'Top' : 'Left')] + computedStyle['margin' + (axis === 'Height' ? 'Bottom' : 'Right')] : 0);
      }
  
      function getWindowSizes() {
          var body = window.document.body;
          var html = window.document.documentElement;
          var computedStyle = isIE10$1() && window.getComputedStyle(html);
  
          return {
              height: getSize('Height', body, html, computedStyle),
              width: getSize('Width', body, html, computedStyle)
          };
      }
  
      var classCallCheck = function (instance, Constructor) {
          if (!(instance instanceof Constructor)) {
              throw new TypeError("Cannot call a class as a function");
          }
      };
  
      var createClass = function () {
          function defineProperties(target, props) {
              for (var i = 0; i < props.length; i++) {
                  var descriptor = props[i];
                  descriptor.enumerable = descriptor.enumerable || false;
                  descriptor.configurable = true;
                  if ("value" in descriptor) descriptor.writable = true;
                  Object.defineProperty(target, descriptor.key, descriptor);
              }
          }
  
          return function (Constructor, protoProps, staticProps) {
              if (protoProps) defineProperties(Constructor.prototype, protoProps);
              if (staticProps) defineProperties(Constructor, staticProps);
              return Constructor;
          };
      }();
  
  
  
  
  
      var defineProperty = function (obj, key, value) {
          if (key in obj) {
              Object.defineProperty(obj, key, {
                  value: value,
                  enumerable: true,
                  configurable: true,
                  writable: true
              });
          } else {
              obj[key] = value;
          }
  
          return obj;
      };
  
      var _extends = Object.assign || function (target) {
          for (var i = 1; i < arguments.length; i++) {
              var source = arguments[i];
  
              for (var key in source) {
                  if (Object.prototype.hasOwnProperty.call(source, key)) {
                      target[key] = source[key];
                  }
              }
          }
  
          return target;
      };
  
      /**
       * Given element offsets, generate an output similar to getBoundingClientRect
       * @method
       * @memberof Popper.Utils
       * @argument {Object} offsets
       * @returns {Object} ClientRect like output
       */
      function getClientRect(offsets) {
          return _extends({}, offsets, {
              right: offsets.left + offsets.width,
              bottom: offsets.top + offsets.height
          });
      }
  
      /**
       * Get bounding client rect of given element
       * @method
       * @memberof Popper.Utils
       * @param {HTMLElement} element
       * @return {Object} client rect
       */
      function getBoundingClientRect(element) {
          var rect = {};
  
          // IE10 10 FIX: Please, don't ask, the element isn't
          // considered in DOM in some circumstances...
          // This isn't reproducible in IE10 compatibility mode of IE11
          if (isIE10$1()) {
              try {
                  rect = element.getBoundingClientRect();
                  var scrollTop = getScroll(element, 'top');
                  var scrollLeft = getScroll(element, 'left');
                  rect.top += scrollTop;
                  rect.left += scrollLeft;
                  rect.bottom += scrollTop;
                  rect.right += scrollLeft;
              } catch (err) { }
          } else {
              rect = element.getBoundingClientRect();
          }
  
          var result = {
              left: rect.left,
              top: rect.top,
              width: rect.right - rect.left,
              height: rect.bottom - rect.top
          };
  
          // subtract scrollbar size from sizes
          var sizes = element.nodeName === 'HTML' ? getWindowSizes() : {};
          var width = sizes.width || element.clientWidth || result.right - result.left;
          var height = sizes.height || element.clientHeight || result.bottom - result.top;
  
          var horizScrollbar = element.offsetWidth - width;
          var vertScrollbar = element.offsetHeight - height;
  
          // if an hypothetical scrollbar is detected, we must be sure it's not a `border`
          // we make this check conditional for performance reasons
          if (horizScrollbar || vertScrollbar) {
              var styles = getStyleComputedProperty(element);
              horizScrollbar -= getBordersSize(styles, 'x');
              vertScrollbar -= getBordersSize(styles, 'y');
  
              result.width -= horizScrollbar;
              result.height -= vertScrollbar;
          }
  
          return getClientRect(result);
      }
  
      function getOffsetRectRelativeToArbitraryNode(children, parent) {
          var isIE10 = isIE10$1();
          var isHTML = parent.nodeName === 'HTML';
          var childrenRect = getBoundingClientRect(children);
          var parentRect = getBoundingClientRect(parent);
          var scrollParent = getScrollParent(children);
  
          var styles = getStyleComputedProperty(parent);
          var borderTopWidth = +styles.borderTopWidth.split('px')[0];
          var borderLeftWidth = +styles.borderLeftWidth.split('px')[0];
  
          var offsets = getClientRect({
              top: childrenRect.top - parentRect.top - borderTopWidth,
              left: childrenRect.left - parentRect.left - borderLeftWidth,
              width: childrenRect.width,
              height: childrenRect.height
          });
          offsets.marginTop = 0;
          offsets.marginLeft = 0;
  
          // Subtract margins of documentElement in case it's being used as parent
          // we do this only on HTML because it's the only element that behaves
          // differently when margins are applied to it. The margins are included in
          // the box of the documentElement, in the other cases not.
          if (!isIE10 && isHTML) {
              var marginTop = +styles.marginTop.split('px')[0];
              var marginLeft = +styles.marginLeft.split('px')[0];
  
              offsets.top -= borderTopWidth - marginTop;
              offsets.bottom -= borderTopWidth - marginTop;
              offsets.left -= borderLeftWidth - marginLeft;
              offsets.right -= borderLeftWidth - marginLeft;
  
              // Attach marginTop and marginLeft because in some circumstances we may need them
              offsets.marginTop = marginTop;
              offsets.marginLeft = marginLeft;
          }
  
          if (isIE10 ? parent.contains(scrollParent) : parent === scrollParent && scrollParent.nodeName !== 'BODY') {
              offsets = includeScroll(offsets, parent);
          }
  
          return offsets;
      }
  
      function getViewportOffsetRectRelativeToArtbitraryNode(element) {
          var html = window.document.documentElement;
          var relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
          var width = Math.max(html.clientWidth, window.innerWidth || 0);
          var height = Math.max(html.clientHeight, window.innerHeight || 0);
  
          var scrollTop = getScroll(html);
          var scrollLeft = getScroll(html, 'left');
  
          var offset = {
              top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
              left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
              width: width,
              height: height
          };
  
          return getClientRect(offset);
      }
  
      /**
       * Check if the given element is fixed or is inside a fixed parent
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element
       * @argument {Element} customContainer
       * @returns {Boolean} answer to "isFixed?"
       */
      function isFixed(element) {
          var nodeName = element.nodeName;
          if (nodeName === 'BODY' || nodeName === 'HTML') {
              return false;
          }
          if (getStyleComputedProperty(element, 'position') === 'fixed') {
              return true;
          }
          return isFixed(getParentNode(element));
      }
  
      /**
       * Computed the boundaries limits and return them
       * @method
       * @memberof Popper.Utils
       * @param {HTMLElement} popper
       * @param {HTMLElement} reference
       * @param {number} padding
       * @param {HTMLElement} boundariesElement - Element used to define the boundaries
       * @returns {Object} Coordinates of the boundaries
       */
      function getBoundaries(popper, reference, padding, boundariesElement) {
          // NOTE: 1 DOM access here
          var boundaries = { top: 0, left: 0 };
          var offsetParent = findCommonOffsetParent(popper, reference);
  
          // Handle viewport case
          if (boundariesElement === 'viewport') {
              boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent);
          } else {
              // Handle other cases based on DOM element used as boundaries
              var boundariesNode = void 0;
              if (boundariesElement === 'scrollParent') {
                  boundariesNode = getScrollParent(getParentNode(popper));
                  if (boundariesNode.nodeName === 'BODY') {
                      boundariesNode = window.document.documentElement;
                  }
              } else if (boundariesElement === 'window') {
                  boundariesNode = window.document.documentElement;
              } else {
                  boundariesNode = boundariesElement;
              }
  
              var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent);
  
              // In case of HTML, we need a different computation
              if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
                  var _getWindowSizes = getWindowSizes(),
                      height = _getWindowSizes.height,
                      width = _getWindowSizes.width;
  
                  boundaries.top += offsets.top - offsets.marginTop;
                  boundaries.bottom = height + offsets.top;
                  boundaries.left += offsets.left - offsets.marginLeft;
                  boundaries.right = width + offsets.left;
              } else {
                  // for all the other DOM elements, this one is good
                  boundaries = offsets;
              }
          }
  
          // Add paddings
          boundaries.left += padding;
          boundaries.top += padding;
          boundaries.right -= padding;
          boundaries.bottom -= padding;
  
          return boundaries;
      }
  
      function getArea(_ref) {
          var width = _ref.width,
              height = _ref.height;
  
          return width * height;
      }
  
      /**
       * Utility used to transform the `auto` placement to the placement with more
       * available space.
       * @method
       * @memberof Popper.Utils
       * @argument {Object} data - The data object generated by update method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function computeAutoPlacement(placement, refRect, popper, reference, boundariesElement) {
          var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0;
  
          if (placement.indexOf('auto') === -1) {
              return placement;
          }
  
          var boundaries = getBoundaries(popper, reference, padding, boundariesElement);
  
          var rects = {
              top: {
                  width: boundaries.width,
                  height: refRect.top - boundaries.top
              },
              right: {
                  width: boundaries.right - refRect.right,
                  height: boundaries.height
              },
              bottom: {
                  width: boundaries.width,
                  height: boundaries.bottom - refRect.bottom
              },
              left: {
                  width: refRect.left - boundaries.left,
                  height: boundaries.height
              }
          };
  
          var sortedAreas = Object.keys(rects).map(function (key) {
              return _extends({
                  key: key
              }, rects[key], {
                      area: getArea(rects[key])
                  });
          }).sort(function (a, b) {
              return b.area - a.area;
          });
  
          var filteredAreas = sortedAreas.filter(function (_ref2) {
              var width = _ref2.width,
                  height = _ref2.height;
              return width >= popper.clientWidth && height >= popper.clientHeight;
          });
  
          var computedPlacement = filteredAreas.length > 0 ? filteredAreas[0].key : sortedAreas[0].key;
  
          var variation = placement.split('-')[1];
  
          return computedPlacement + (variation ? '-' + variation : '');
      }
  
      /**
       * Get offsets to the reference element
       * @method
       * @memberof Popper.Utils
       * @param {Object} state
       * @param {Element} popper - the popper element
       * @param {Element} reference - the reference element (the popper will be relative to this)
       * @returns {Object} An object containing the offsets which will be applied to the popper
       */
      function getReferenceOffsets(state, popper, reference) {
          var commonOffsetParent = findCommonOffsetParent(popper, reference);
          return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent);
      }
  
      /**
       * Get the outer sizes of the given element (offset size + margins)
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element
       * @returns {Object} object containing width and height properties
       */
      function getOuterSizes(element) {
          var styles = window.getComputedStyle(element);
          var x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);
          var y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);
          var result = {
              width: element.offsetWidth + y,
              height: element.offsetHeight + x
          };
          return result;
      }
  
      /**
       * Get the opposite placement of the given one
       * @method
       * @memberof Popper.Utils
       * @argument {String} placement
       * @returns {String} flipped placement
       */
      function getOppositePlacement(placement) {
          var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
          return placement.replace(/left|right|bottom|top/g, function (matched) {
              return hash[matched];
          });
      }
  
      /**
       * Get offsets to the popper
       * @method
       * @memberof Popper.Utils
       * @param {Object} position - CSS position the Popper will get applied
       * @param {HTMLElement} popper - the popper element
       * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
       * @param {String} placement - one of the valid placement options
       * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
       */
      function getPopperOffsets(popper, referenceOffsets, placement) {
          placement = placement.split('-')[0];
  
          // Get popper node sizes
          var popperRect = getOuterSizes(popper);
  
          // Add position, width and height to our offsets object
          var popperOffsets = {
              width: popperRect.width,
              height: popperRect.height
          };
  
          // depending by the popper placement we have to compute its offsets slightly differently
          var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
          var mainSide = isHoriz ? 'top' : 'left';
          var secondarySide = isHoriz ? 'left' : 'top';
          var measurement = isHoriz ? 'height' : 'width';
          var secondaryMeasurement = !isHoriz ? 'height' : 'width';
  
          popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
          if (placement === secondarySide) {
              popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
          } else {
              popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
          }
  
          return popperOffsets;
      }
  
      /**
       * Mimics the `find` method of Array
       * @method
       * @memberof Popper.Utils
       * @argument {Array} arr
       * @argument prop
       * @argument value
       * @returns index or -1
       */
      function find(arr, check) {
          // use native find if supported
          if (Array.prototype.find) {
              return arr.find(check);
          }
  
          // use `filter` to obtain the same behavior of `find`
          return arr.filter(check)[0];
      }
  
      /**
       * Return the index of the matching object
       * @method
       * @memberof Popper.Utils
       * @argument {Array} arr
       * @argument prop
       * @argument value
       * @returns index or -1
       */
      function findIndex(arr, prop, value) {
          // use native findIndex if supported
          if (Array.prototype.findIndex) {
              return arr.findIndex(function (cur) {
                  return cur[prop] === value;
              });
          }
  
          // use `find` + `indexOf` if `findIndex` isn't supported
          var match = find(arr, function (obj) {
              return obj[prop] === value;
          });
          return arr.indexOf(match);
      }
  
      /**
       * Loop trough the list of modifiers and run them in order,
       * each of them will then edit the data object.
       * @method
       * @memberof Popper.Utils
       * @param {dataObject} data
       * @param {Array} modifiers
       * @param {String} ends - Optional modifier name used as stopper
       * @returns {dataObject}
       */
      function runModifiers(modifiers, data, ends) {
          var modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));
  
          modifiersToRun.forEach(function (modifier) {
              if (modifier.function) {
                  console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
              }
              var fn = modifier.function || modifier.fn;
              if (modifier.enabled && isFunction(fn)) {
                  // Add properties to offsets to make them a complete clientRect object
                  // we do this before each modifier to make sure the previous one doesn't
                  // mess with these values
                  data.offsets.popper = getClientRect(data.offsets.popper);
                  data.offsets.reference = getClientRect(data.offsets.reference);
  
                  data = fn(data, modifier);
              }
          });
  
          return data;
      }
  
      /**
       * Updates the position of the popper, computing the new offsets and applying
       * the new style.<br />
       * Prefer `scheduleUpdate` over `update` because of performance reasons.
       * @method
       * @memberof Popper
       */
      function update() {
          // if popper is destroyed, don't perform any further update
          if (this.state.isDestroyed) {
              return;
          }
  
          var data = {
              instance: this,
              styles: {},
              attributes: {},
              flipped: false,
              offsets: {}
          };
  
          // compute reference element offsets
          data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference);
  
          // compute auto placement, store placement inside the data object,
          // modifiers will be able to edit `placement` if needed
          // and refer to originalPlacement to know the original value
          data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);
  
          // store the computed placement inside `originalPlacement`
          data.originalPlacement = data.placement;
  
          // compute the popper offsets
          data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);
          data.offsets.popper.position = 'absolute';
  
          // run the modifiers
          data = runModifiers(this.modifiers, data);
  
          // the first `update` will call `onCreate` callback
          // the other ones will call `onUpdate` callback
          if (!this.state.isCreated) {
              this.state.isCreated = true;
              this.options.onCreate(data);
          } else {
              this.options.onUpdate(data);
          }
      }
  
      /**
       * Helper used to know if the given modifier is enabled.
       * @method
       * @memberof Popper.Utils
       * @returns {Boolean}
       */
      function isModifierEnabled(modifiers, modifierName) {
          return modifiers.some(function (_ref) {
              var name = _ref.name,
                  enabled = _ref.enabled;
              return enabled && name === modifierName;
          });
      }
  
      /**
       * Get the prefixed supported property name
       * @method
       * @memberof Popper.Utils
       * @argument {String} property (camelCase)
       * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
       */
      function getSupportedPropertyName(property) {
          var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
          var upperProp = property.charAt(0).toUpperCase() + property.slice(1);
  
          for (var i = 0; i < prefixes.length - 1; i++) {
              var prefix = prefixes[i];
              var toCheck = prefix ? '' + prefix + upperProp : property;
              if (typeof window.document.body.style[toCheck] !== 'undefined') {
                  return toCheck;
              }
          }
          return null;
      }
  
      /**
       * Destroy the popper
       * @method
       * @memberof Popper
       */
      function destroy() {
          this.state.isDestroyed = true;
  
          // touch DOM only if `applyStyle` modifier is enabled
          if (isModifierEnabled(this.modifiers, 'applyStyle')) {
              this.popper.removeAttribute('x-placement');
              this.popper.style.left = '';
              this.popper.style.position = '';
              this.popper.style.top = '';
              this.popper.style[getSupportedPropertyName('transform')] = '';
          }
  
          this.disableEventListeners();
  
          // remove the popper if user explicity asked for the deletion on destroy
          // do not use `remove` because IE11 doesn't support it
          if (this.options.removeOnDestroy) {
              this.popper.parentNode.removeChild(this.popper);
          }
          return this;
      }
  
      function attachToScrollParents(scrollParent, event, callback, scrollParents) {
          var isBody = scrollParent.nodeName === 'BODY';
          var target = isBody ? window : scrollParent;
          target.addEventListener(event, callback, { passive: true });
  
          if (!isBody) {
              attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
          }
          scrollParents.push(target);
      }
  
      /**
       * Setup needed event listeners used to update the popper position
       * @method
       * @memberof Popper.Utils
       * @private
       */
      function setupEventListeners(reference, options, state, updateBound) {
          // Resize event listener on window
          state.updateBound = updateBound;
          window.addEventListener('resize', state.updateBound, { passive: true });
  
          // Scroll event listener on scroll parents
          var scrollElement = getScrollParent(reference);
          attachToScrollParents(scrollElement, 'scroll', state.updateBound, state.scrollParents);
          state.scrollElement = scrollElement;
          state.eventsEnabled = true;
  
          return state;
      }
  
      /**
       * It will add resize/scroll events and start recalculating
       * position of the popper element when they are triggered.
       * @method
       * @memberof Popper
       */
      function enableEventListeners() {
          if (!this.state.eventsEnabled) {
              this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
          }
      }
  
      /**
       * Remove event listeners used to update the popper position
       * @method
       * @memberof Popper.Utils
       * @private
       */
      function removeEventListeners(reference, state) {
          // Remove resize event listener on window
          window.removeEventListener('resize', state.updateBound);
  
          // Remove scroll event listener on scroll parents
          state.scrollParents.forEach(function (target) {
              target.removeEventListener('scroll', state.updateBound);
          });
  
          // Reset state
          state.updateBound = null;
          state.scrollParents = [];
          state.scrollElement = null;
          state.eventsEnabled = false;
          return state;
      }
  
      /**
       * It will remove resize/scroll events and won't recalculate popper position
       * when they are triggered. It also won't trigger onUpdate callback anymore,
       * unless you call `update` method manually.
       * @method
       * @memberof Popper
       */
      function disableEventListeners() {
          if (this.state.eventsEnabled) {
              window.cancelAnimationFrame(this.scheduleUpdate);
              this.state = removeEventListeners(this.reference, this.state);
          }
      }
  
      /**
       * Tells if a given input is a number
       * @method
       * @memberof Popper.Utils
       * @param {*} input to check
       * @return {Boolean}
       */
      function isNumeric(n) {
          return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
      }
  
      /**
       * Set the style to the given popper
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element - Element to apply the style to
       * @argument {Object} styles
       * Object with a list of properties and values which will be applied to the element
       */
      function setStyles(element, styles) {
          Object.keys(styles).forEach(function (prop) {
              var unit = '';
              // add unit if the value is numeric and is one of the following
              if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
                  unit = 'px';
              }
              element.style[prop] = styles[prop] + unit;
          });
      }
  
      /**
       * Set the attributes to the given popper
       * @method
       * @memberof Popper.Utils
       * @argument {Element} element - Element to apply the attributes to
       * @argument {Object} styles
       * Object with a list of properties and values which will be applied to the element
       */
      function setAttributes(element, attributes) {
          Object.keys(attributes).forEach(function (prop) {
              var value = attributes[prop];
              if (value !== false) {
                  element.setAttribute(prop, attributes[prop]);
              } else {
                  element.removeAttribute(prop);
              }
          });
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by `update` method
       * @argument {Object} data.styles - List of style properties - values to apply to popper element
       * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The same data object
       */
      function applyStyle(data) {
          // any property present in `data.styles` will be applied to the popper,
          // in this way we can make the 3rd party modifiers add custom styles to it
          // Be aware, modifiers could override the properties defined in the previous
          // lines of this modifier!
          setStyles(data.instance.popper, data.styles);
  
          // any property present in `data.attributes` will be applied to the popper,
          // they will be set as HTML attributes of the element
          setAttributes(data.instance.popper, data.attributes);
  
          // if the arrow style has been computed, apply the arrow style
          if (data.offsets.arrow) {
              setStyles(data.arrowElement, data.offsets.arrow);
          }
  
          return data;
      }
  
      /**
       * Set the x-placement attribute before everything else because it could be used
       * to add margins to the popper margins needs to be calculated to get the
       * correct popper offsets.
       * @method
       * @memberof Popper.modifiers
       * @param {HTMLElement} reference - The reference element used to position the popper
       * @param {HTMLElement} popper - The HTML element used as popper.
       * @param {Object} options - Popper.js options
       */
      function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
          // compute reference element offsets
          var referenceOffsets = getReferenceOffsets(state, popper, reference);
  
          // compute auto placement, store placement inside the data object,
          // modifiers will be able to edit `placement` if needed
          // and refer to originalPlacement to know the original value
          var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);
  
          popper.setAttribute('x-placement', placement);
  
          // Apply `position` to popper before anything else because
          // without the position applied we can't guarantee correct computations
          setStyles(popper, { position: 'absolute' });
  
          return options;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by `update` method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function computeStyle(data, options) {
          var x = options.x,
              y = options.y;
          var popper = data.offsets.popper;
  
          // Remove this legacy support in Popper.js v2
  
          var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {
              return modifier.name === 'applyStyle';
          }).gpuAcceleration;
          if (legacyGpuAccelerationOption !== undefined) {
              console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
          }
          var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;
  
          var offsetParent = getOffsetParent(data.instance.popper);
          var offsetParentRect = getBoundingClientRect(offsetParent);
  
          // Styles
          var styles = {
              position: popper.position
          };
  
          // floor sides to avoid blurry text
          var offsets = {
              left: Math.floor(popper.left),
              top: Math.floor(popper.top),
              bottom: Math.floor(popper.bottom),
              right: Math.floor(popper.right)
          };
  
          var sideA = x === 'bottom' ? 'top' : 'bottom';
          var sideB = y === 'right' ? 'left' : 'right';
  
          // if gpuAcceleration is set to `true` and transform is supported,
          //  we use `translate3d` to apply the position to the popper we
          // automatically use the supported prefixed version if needed
          var prefixedProperty = getSupportedPropertyName('transform');
  
          // now, let's make a step back and look at this code closely (wtf?)
          // If the content of the popper grows once it's been positioned, it
          // may happen that the popper gets misplaced because of the new content
          // overflowing its reference element
          // To avoid this problem, we provide two options (x and y), which allow
          // the consumer to define the offset origin.
          // If we position a popper on top of a reference element, we can set
          // `x` to `top` to make the popper grow towards its top instead of
          // its bottom.
          var left = void 0,
              top = void 0;
          if (sideA === 'bottom') {
              top = -offsetParentRect.height + offsets.bottom;
          } else {
              top = offsets.top;
          }
          if (sideB === 'right') {
              left = -offsetParentRect.width + offsets.right;
          } else {
              left = offsets.left;
          }
          if (gpuAcceleration && prefixedProperty) {
              styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';
              styles[sideA] = 0;
              styles[sideB] = 0;
              styles.willChange = 'transform';
          } else {
              // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
              var invertTop = sideA === 'bottom' ? -1 : 1;
              var invertLeft = sideB === 'right' ? -1 : 1;
              styles[sideA] = top * invertTop;
              styles[sideB] = left * invertLeft;
              styles.willChange = sideA + ', ' + sideB;
          }
  
          // Attributes
          var attributes = {
              'x-placement': data.placement
          };
  
          // Update attributes and styles of `data`
          data.attributes = _extends({}, attributes, data.attributes);
          data.styles = _extends({}, styles, data.styles);
  
          return data;
      }
  
      /**
       * Helper used to know if the given modifier depends from another one.<br />
       * It checks if the needed modifier is listed and enabled.
       * @method
       * @memberof Popper.Utils
       * @param {Array} modifiers - list of modifiers
       * @param {String} requestingName - name of requesting modifier
       * @param {String} requestedName - name of requested modifier
       * @returns {Boolean}
       */
      function isModifierRequired(modifiers, requestingName, requestedName) {
          var requesting = find(modifiers, function (_ref) {
              var name = _ref.name;
              return name === requestingName;
          });
  
          var isRequired = !!requesting && modifiers.some(function (modifier) {
              return modifier.name === requestedName && modifier.enabled && modifier.order < requesting.order;
          });
  
          if (!isRequired) {
              var _requesting = '`' + requestingName + '`';
              var requested = '`' + requestedName + '`';
              console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');
          }
          return isRequired;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by update method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function arrow(data, options) {
          // arrow depends on keepTogether in order to work
          if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
              return data;
          }
  
          var arrowElement = options.element;
  
          // if arrowElement is a string, suppose it's a CSS selector
          if (typeof arrowElement === 'string') {
              arrowElement = data.instance.popper.querySelector(arrowElement);
  
              // if arrowElement is not found, don't run the modifier
              if (!arrowElement) {
                  return data;
              }
          } else {
              // if the arrowElement isn't a query selector we must check that the
              // provided DOM node is child of its popper node
              if (!data.instance.popper.contains(arrowElement)) {
                  console.warn('WARNING: `arrow.element` must be child of its popper element!');
                  return data;
              }
          }
  
          var placement = data.placement.split('-')[0];
          var _data$offsets = data.offsets,
              popper = _data$offsets.popper,
              reference = _data$offsets.reference;
  
          var isVertical = ['left', 'right'].indexOf(placement) !== -1;
  
          var len = isVertical ? 'height' : 'width';
          var side = isVertical ? 'top' : 'left';
          var altSide = isVertical ? 'left' : 'top';
          var opSide = isVertical ? 'bottom' : 'right';
          var arrowElementSize = getOuterSizes(arrowElement)[len];
  
          //
          // extends keepTogether behavior making sure the popper and its reference have enough pixels in conjuction
          //
  
          // top/left side
          if (reference[opSide] - arrowElementSize < popper[side]) {
              data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
          }
          // bottom/right side
          if (reference[side] + arrowElementSize > popper[opSide]) {
              data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
          }
  
          // compute center of the popper
          var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
  
          // Compute the sideValue using the updated popper offsets
          var sideValue = center - getClientRect(data.offsets.popper)[side];
  
          // prevent arrowElement from being placed not contiguously to its popper
          sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
  
          data.arrowElement = arrowElement;
          data.offsets.arrow = {};
          data.offsets.arrow[side] = Math.round(sideValue);
          data.offsets.arrow[altSide] = ''; // make sure to unset any eventual altSide value from the DOM node
  
          return data;
      }
  
      /**
       * Get the opposite placement variation of the given one
       * @method
       * @memberof Popper.Utils
       * @argument {String} placement variation
       * @returns {String} flipped placement variation
       */
      function getOppositeVariation(variation) {
          if (variation === 'end') {
              return 'start';
          } else if (variation === 'start') {
              return 'end';
          }
          return variation;
      }
  
      /**
       * List of accepted placements to use as values of the `placement` option.<br />
       * Valid placements are:
       * - `auto`
       * - `top`
       * - `right`
       * - `bottom`
       * - `left`
       *
       * Each placement can have a variation from this list:
       * - `-start`
       * - `-end`
       *
       * Variations are interpreted easily if you think of them as the left to right
       * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`
       * is right.<br />
       * Vertically (`left` and `right`), `start` is top and `end` is bottom.
       *
       * Some valid examples are:
       * - `top-end` (on top of reference, right aligned)
       * - `right-start` (on right of reference, top aligned)
       * - `bottom` (on bottom, centered)
       * - `auto-right` (on the side with more space available, alignment depends by placement)
       *
       * @static
       * @type {Array}
       * @enum {String}
       * @readonly
       * @method placements
       * @memberof Popper
       */
      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'];
  
      // Get rid of `auto` `auto-start` and `auto-end`
      var validPlacements = placements.slice(3);
  
      /**
       * Given an initial placement, returns all the subsequent placements
       * clockwise (or counter-clockwise).
       *
       * @method
       * @memberof Popper.Utils
       * @argument {String} placement - A valid placement (it accepts variations)
       * @argument {Boolean} counter - Set to true to walk the placements counterclockwise
       * @returns {Array} placements including their variations
       */
      function clockwise(placement) {
          var counter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  
          var index = validPlacements.indexOf(placement);
          var arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));
          return counter ? arr.reverse() : arr;
      }
  
      var BEHAVIORS = {
          FLIP: 'flip',
          CLOCKWISE: 'clockwise',
          COUNTERCLOCKWISE: 'counterclockwise'
      };
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by update method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function flip(data, options) {
          // if `inner` modifier is enabled, we can't use the `flip` modifier
          if (isModifierEnabled(data.instance.modifiers, 'inner')) {
              return data;
          }
  
          if (data.flipped && data.placement === data.originalPlacement) {
              // seems like flip is trying to loop, probably there's not enough space on any of the flippable sides
              return data;
          }
  
          var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement);
  
          var placement = data.placement.split('-')[0];
          var placementOpposite = getOppositePlacement(placement);
          var variation = data.placement.split('-')[1] || '';
  
          var flipOrder = [];
  
          switch (options.behavior) {
              case BEHAVIORS.FLIP:
                  flipOrder = [placement, placementOpposite];
                  break;
              case BEHAVIORS.CLOCKWISE:
                  flipOrder = clockwise(placement);
                  break;
              case BEHAVIORS.COUNTERCLOCKWISE:
                  flipOrder = clockwise(placement, true);
                  break;
              default:
                  flipOrder = options.behavior;
          }
  
          flipOrder.forEach(function (step, index) {
              if (placement !== step || flipOrder.length === index + 1) {
                  return data;
              }
  
              placement = data.placement.split('-')[0];
              placementOpposite = getOppositePlacement(placement);
  
              var popperOffsets = data.offsets.popper;
              var refOffsets = data.offsets.reference;
  
              // using floor because the reference offsets may contain decimals we are not going to consider here
              var floor = Math.floor;
              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);
  
              var overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);
              var overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);
              var overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);
              var overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);
  
              var overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;
  
              // flip the variation if required
              var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
              var flippedVariation = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);
  
              if (overlapsRef || overflowsBoundaries || flippedVariation) {
                  // this boolean to detect any flip loop
                  data.flipped = true;
  
                  if (overlapsRef || overflowsBoundaries) {
                      placement = flipOrder[index + 1];
                  }
  
                  if (flippedVariation) {
                      variation = getOppositeVariation(variation);
                  }
  
                  data.placement = placement + (variation ? '-' + variation : '');
  
                  // this object contains `position`, we want to preserve it along with
                  // any additional property we may add in the future
                  data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));
  
                  data = runModifiers(data.instance.modifiers, data, 'flip');
              }
          });
          return data;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by update method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function keepTogether(data) {
          var _data$offsets = data.offsets,
              popper = _data$offsets.popper,
              reference = _data$offsets.reference;
  
          var placement = data.placement.split('-')[0];
          var floor = Math.floor;
          var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
          var side = isVertical ? 'right' : 'bottom';
          var opSide = isVertical ? 'left' : 'top';
          var measurement = isVertical ? 'width' : 'height';
  
          if (popper[side] < floor(reference[opSide])) {
              data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
          }
          if (popper[opSide] > floor(reference[side])) {
              data.offsets.popper[opSide] = floor(reference[side]);
          }
  
          return data;
      }
  
      /**
       * Converts a string containing value + unit into a px value number
       * @function
       * @memberof {modifiers~offset}
       * @private
       * @argument {String} str - Value + unit string
       * @argument {String} measurement - `height` or `width`
       * @argument {Object} popperOffsets
       * @argument {Object} referenceOffsets
       * @returns {Number|String}
       * Value in pixels, or original string if no values were extracted
       */
      function toValue(str, measurement, popperOffsets, referenceOffsets) {
          // separate value from unit
          var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
          var value = +split[1];
          var unit = split[2];
  
          // If it's not a number it's an operator, I guess
          if (!value) {
              return str;
          }
  
          if (unit.indexOf('%') === 0) {
              var element = void 0;
              switch (unit) {
                  case '%p':
                      element = popperOffsets;
                      break;
                  case '%':
                  case '%r':
                  default:
                      element = referenceOffsets;
              }
  
              var rect = getClientRect(element);
              return rect[measurement] / 100 * value;
          } else if (unit === 'vh' || unit === 'vw') {
              // if is a vh or vw, we calculate the size based on the viewport
              var size = void 0;
              if (unit === 'vh') {
                  size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
              } else {
                  size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
              }
              return size / 100 * value;
          } else {
              // if is an explicit pixel unit, we get rid of the unit and keep the value
              // if is an implicit unit, it's px, and we return just the value
              return value;
          }
      }
  
      /**
       * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
       * @function
       * @memberof {modifiers~offset}
       * @private
       * @argument {String} offset
       * @argument {Object} popperOffsets
       * @argument {Object} referenceOffsets
       * @argument {String} basePlacement
       * @returns {Array} a two cells array with x and y offsets in numbers
       */
      function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
          var offsets = [0, 0];
  
          // Use height if placement is left or right and index is 0 otherwise use width
          // in this way the first offset will use an axis and the second one
          // will use the other one
          var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
  
          // Split the offset string to obtain a list of values and operands
          // The regex addresses values with the plus or minus sign in front (+10, -20, etc)
          var fragments = offset.split(/(\+|\-)/).map(function (frag) {
              return frag.trim();
          });
  
          // Detect if the offset string contains a pair of values or a single one
          // they could be separated by comma or space
          var divider = fragments.indexOf(find(fragments, function (frag) {
              return frag.search(/,|\s/) !== -1;
          }));
  
          if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
              console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
          }
  
          // If divider is found, we divide the list of values and operands to divide
          // them by ofset X and Y.
          var splitRegex = /\s*,\s*|\s+/;
          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];
  
          // Convert the values with units to absolute pixels to allow our computations
          ops = ops.map(function (op, index) {
              // Most of the units rely on the orientation of the popper
              var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
              var mergeWithPrevious = false;
              return op
                  // This aggregates any `+` or `-` sign that aren't considered operators
                  // e.g.: 10 + +5 => [10, +, +5]
                  .reduce(function (a, b) {
                      if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
                          a[a.length - 1] = b;
                          mergeWithPrevious = true;
                          return a;
                      } else if (mergeWithPrevious) {
                          a[a.length - 1] += b;
                          mergeWithPrevious = false;
                          return a;
                      } else {
                          return a.concat(b);
                      }
                  }, [])
                  // Here we convert the string values into number values (in px)
                  .map(function (str) {
                      return toValue(str, measurement, popperOffsets, referenceOffsets);
                  });
          });
  
          // Loop trough the offsets arrays and execute the operations
          ops.forEach(function (op, index) {
              op.forEach(function (frag, index2) {
                  if (isNumeric(frag)) {
                      offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
                  }
              });
          });
          return offsets;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by update method
       * @argument {Object} options - Modifiers configuration and options
       * @argument {Number|String} options.offset=0
       * The offset value as described in the modifier description
       * @returns {Object} The data object, properly modified
       */
      function offset(data, _ref) {
          var offset = _ref.offset;
          var placement = data.placement,
              _data$offsets = data.offsets,
              popper = _data$offsets.popper,
              reference = _data$offsets.reference;
  
          var basePlacement = placement.split('-')[0];
  
          var offsets = void 0;
          if (isNumeric(+offset)) {
              offsets = [+offset, 0];
          } else {
              offsets = parseOffset(offset, popper, reference, basePlacement);
          }
  
          if (basePlacement === 'left') {
              popper.top += offsets[0];
              popper.left -= offsets[1];
          } else if (basePlacement === 'right') {
              popper.top += offsets[0];
              popper.left += offsets[1];
          } else if (basePlacement === 'top') {
              popper.left += offsets[0];
              popper.top -= offsets[1];
          } else if (basePlacement === 'bottom') {
              popper.left += offsets[0];
              popper.top += offsets[1];
          }
  
          data.popper = popper;
          return data;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by `update` method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function preventOverflow(data, options) {
          var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);
  
          // If offsetParent is the reference element, we really want to
          // go one step up and use the next offsetParent as reference to
          // avoid to make this modifier completely useless and look like broken
          if (data.instance.reference === boundariesElement) {
              boundariesElement = getOffsetParent(boundariesElement);
          }
  
          var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement);
          options.boundaries = boundaries;
  
          var order = options.priority;
          var popper = data.offsets.popper;
  
          var check = {
              primary: function primary(placement) {
                  var value = popper[placement];
                  if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
                      value = Math.max(popper[placement], boundaries[placement]);
                  }
                  return defineProperty({}, placement, value);
              },
              secondary: function secondary(placement) {
                  var mainSide = placement === 'right' ? 'left' : 'top';
                  var value = popper[mainSide];
                  if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
                      value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
                  }
                  return defineProperty({}, mainSide, value);
              }
          };
  
          order.forEach(function (placement) {
              var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
              popper = _extends({}, popper, check[side](placement));
          });
  
          data.offsets.popper = popper;
  
          return data;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by `update` method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function shift(data) {
          var placement = data.placement;
          var basePlacement = placement.split('-')[0];
          var shiftvariation = placement.split('-')[1];
  
          // if shift shiftvariation is specified, run the modifier
          if (shiftvariation) {
              var _data$offsets = data.offsets,
                  reference = _data$offsets.reference,
                  popper = _data$offsets.popper;
  
              var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
              var side = isVertical ? 'left' : 'top';
              var measurement = isVertical ? 'width' : 'height';
  
              var shiftOffsets = {
                  start: defineProperty({}, side, reference[side]),
                  end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])
              };
  
              data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);
          }
  
          return data;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by update method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function hide(data) {
          if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
              return data;
          }
  
          var refRect = data.offsets.reference;
          var bound = find(data.instance.modifiers, function (modifier) {
              return modifier.name === 'preventOverflow';
          }).boundaries;
  
          if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
              // Avoid unnecessary DOM access if visibility hasn't changed
              if (data.hide === true) {
                  return data;
              }
  
              data.hide = true;
              data.attributes['x-out-of-boundaries'] = '';
          } else {
              // Avoid unnecessary DOM access if visibility hasn't changed
              if (data.hide === false) {
                  return data;
              }
  
              data.hide = false;
              data.attributes['x-out-of-boundaries'] = false;
          }
  
          return data;
      }
  
      /**
       * @function
       * @memberof Modifiers
       * @argument {Object} data - The data object generated by `update` method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {Object} The data object, properly modified
       */
      function inner(data) {
          var placement = data.placement;
          var basePlacement = placement.split('-')[0];
          var _data$offsets = data.offsets,
              popper = _data$offsets.popper,
              reference = _data$offsets.reference;
  
          var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;
  
          var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
  
          popper[isHoriz ? 'left' : 'top'] = reference[placement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
  
          data.placement = getOppositePlacement(placement);
          data.offsets.popper = getClientRect(popper);
  
          return data;
      }
  
      /**
       * Modifier function, each modifier can have a function of this type assigned
       * to its `fn` property.<br />
       * These functions will be called on each update, this means that you must
       * make sure they are performant enough to avoid performance bottlenecks.
       *
       * @function ModifierFn
       * @argument {dataObject} data - The data object generated by `update` method
       * @argument {Object} options - Modifiers configuration and options
       * @returns {dataObject} The data object, properly modified
       */
  
      /**
       * Modifiers are plugins used to alter the behavior of your poppers.<br />
       * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
       * needed by the library.
       *
       * Usually you don't want to override the `order`, `fn` and `onLoad` props.
       * All the other properties are configurations that could be tweaked.
       * @namespace modifiers
       */
      var modifiers = {
          /**
           * Modifier used to shift the popper on the start or end of its reference
           * element.<br />
           * It will read the variation of the `placement` property.<br />
           * It can be one either `-end` or `-start`.
           * @memberof modifiers
           * @inner
           */
          shift: {
              /** @prop {number} order=100 - Index used to define the order of execution */
              order: 100,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: shift
          },
  
          /**
           * The `offset` modifier can shift your popper on both its axis.
           *
           * It accepts the following units:
           * - `px` or unitless, interpreted as pixels
           * - `%` or `%r`, percentage relative to the length of the reference element
           * - `%p`, percentage relative to the length of the popper element
           * - `vw`, CSS viewport width unit
           * - `vh`, CSS viewport height unit
           *
           * For length is intended the main axis relative to the placement of the popper.<br />
           * This means that if the placement is `top` or `bottom`, the length will be the
           * `width`. In case of `left` or `right`, it will be the height.
           *
           * You can provide a single value (as `Number` or `String`), or a pair of values
           * as `String` divided by a comma or one (or more) white spaces.<br />
           * The latter is a deprecated method because it leads to confusion and will be
           * removed in v2.<br />
           * Additionally, it accepts additions and subtractions between different units.
           * Note that multiplications and divisions aren't supported.
           *
           * Valid examples are:
           * ```
           * 10
           * '10%'
           * '10, 10'
           * '10%, 10'
           * '10 + 10%'
           * '10 - 5vh + 3%'
           * '-10px + 5vh, 5px - 6%'
           * ```
           *
           * @memberof modifiers
           * @inner
           */
          offset: {
              /** @prop {number} order=200 - Index used to define the order of execution */
              order: 200,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: offset,
              /** @prop {Number|String} offset=0
               * The offset value as described in the modifier description
               */
              offset: 0
          },
  
          /**
           * Modifier used to prevent the popper from being positioned outside the boundary.
           *
           * An scenario exists where the reference itself is not within the boundaries.<br />
           * We can say it has "escaped the boundaries" — or just "escaped".<br />
           * In this case we need to decide whether the popper should either:
           *
           * - detach from the reference and remain "trapped" in the boundaries, or
           * - if it should ignore the boundary and "escape with its reference"
           *
           * When `escapeWithReference` is set to`true` and reference is completely
           * outside its boundaries, the popper will overflow (or completely leave)
           * the boundaries in order to remain attached to the edge of the reference.
           *
           * @memberof modifiers
           * @inner
           */
          preventOverflow: {
              /** @prop {number} order=300 - Index used to define the order of execution */
              order: 300,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: preventOverflow,
              /**
               * @prop {Array} [priority=['left','right','top','bottom']]
               * Popper will try to prevent overflow following these priorities by default,
               * then, it could overflow on the left and on top of the `boundariesElement`
               */
              priority: ['left', 'right', 'top', 'bottom'],
              /**
               * @prop {number} padding=5
               * Amount of pixel used to define a minimum distance between the boundaries
               * and the popper this makes sure the popper has always a little padding
               * between the edges of its container
               */
              padding: 5,
              /**
               * @prop {String|HTMLElement} boundariesElement='scrollParent'
               * Boundaries used by the modifier, can be `scrollParent`, `window`,
               * `viewport` or any DOM element.
               */
              boundariesElement: 'scrollParent'
          },
  
          /**
           * Modifier used to make sure the reference and its popper stay near eachothers
           * without leaving any gap between the two. Expecially useful when the arrow is
           * enabled and you want to assure it to point to its reference element.
           * It cares only about the first axis, you can still have poppers with margin
           * between the popper and its reference element.
           * @memberof modifiers
           * @inner
           */
          keepTogether: {
              /** @prop {number} order=400 - Index used to define the order of execution */
              order: 400,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: keepTogether
          },
  
          /**
           * This modifier is used to move the `arrowElement` of the popper to make
           * sure it is positioned between the reference element and its popper element.
           * It will read the outer size of the `arrowElement` node to detect how many
           * pixels of conjuction are needed.
           *
           * It has no effect if no `arrowElement` is provided.
           * @memberof modifiers
           * @inner
           */
          arrow: {
              /** @prop {number} order=500 - Index used to define the order of execution */
              order: 500,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: arrow,
              /** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */
              element: '[x-arrow]'
          },
  
          /**
           * Modifier used to flip the popper's placement when it starts to overlap its
           * reference element.
           *
           * Requires the `preventOverflow` modifier before it in order to work.
           *
           * **NOTE:** this modifier will interrupt the current update cycle and will
           * restart it if it detects the need to flip the placement.
           * @memberof modifiers
           * @inner
           */
          flip: {
              /** @prop {number} order=600 - Index used to define the order of execution */
              order: 600,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: flip,
              /**
               * @prop {String|Array} behavior='flip'
               * The behavior used to change the popper's placement. It can be one of
               * `flip`, `clockwise`, `counterclockwise` or an array with a list of valid
               * placements (with optional variations).
               */
              behavior: 'flip',
              /**
               * @prop {number} padding=5
               * The popper will flip if it hits the edges of the `boundariesElement`
               */
              padding: 5,
              /**
               * @prop {String|HTMLElement} boundariesElement='viewport'
               * The element which will define the boundaries of the popper position,
               * the popper will never be placed outside of the defined boundaries
               * (except if keepTogether is enabled)
               */
              boundariesElement: 'viewport'
          },
  
          /**
           * Modifier used to make the popper flow toward the inner of the reference element.
           * By default, when this modifier is disabled, the popper will be placed outside
           * the reference element.
           * @memberof modifiers
           * @inner
           */
          inner: {
              /** @prop {number} order=700 - Index used to define the order of execution */
              order: 700,
              /** @prop {Boolean} enabled=false - Whether the modifier is enabled or not */
              enabled: false,
              /** @prop {ModifierFn} */
              fn: inner
          },
  
          /**
           * Modifier used to hide the popper when its reference element is outside of the
           * popper boundaries. It will set a `x-out-of-boundaries` attribute which can
           * be used to hide with a CSS selector the popper when its reference is
           * out of boundaries.
           *
           * Requires the `preventOverflow` modifier before it in order to work.
           * @memberof modifiers
           * @inner
           */
          hide: {
              /** @prop {number} order=800 - Index used to define the order of execution */
              order: 800,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: hide
          },
  
          /**
           * Computes the style that will be applied to the popper element to gets
           * properly positioned.
           *
           * Note that this modifier will not touch the DOM, it just prepares the styles
           * so that `applyStyle` modifier can apply it. This separation is useful
           * in case you need to replace `applyStyle` with a custom implementation.
           *
           * This modifier has `850` as `order` value to maintain backward compatibility
           * with previous versions of Popper.js. Expect the modifiers ordering method
           * to change in future major versions of the library.
           *
           * @memberof modifiers
           * @inner
           */
          computeStyle: {
              /** @prop {number} order=850 - Index used to define the order of execution */
              order: 850,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: computeStyle,
              /**
               * @prop {Boolean} gpuAcceleration=true
               * If true, it uses the CSS 3d transformation to position the popper.
               * Otherwise, it will use the `top` and `left` properties.
               */
              gpuAcceleration: true,
              /**
               * @prop {string} [x='bottom']
               * Where to anchor the X axis (`bottom` or `top`). AKA X offset origin.
               * Change this if your popper should grow in a direction different from `bottom`
               */
              x: 'bottom',
              /**
               * @prop {string} [x='left']
               * Where to anchor the Y axis (`left` or `right`). AKA Y offset origin.
               * Change this if your popper should grow in a direction different from `right`
               */
              y: 'right'
          },
  
          /**
           * Applies the computed styles to the popper element.
           *
           * All the DOM manipulations are limited to this modifier. This is useful in case
           * you want to integrate Popper.js inside a framework or view library and you
           * want to delegate all the DOM manipulations to it.
           *
           * Note that if you disable this modifier, you must make sure the popper element
           * has its position set to `absolute` before Popper.js can do its work!
           *
           * Just disable this modifier and define you own to achieve the desired effect.
           *
           * @memberof modifiers
           * @inner
           */
          applyStyle: {
              /** @prop {number} order=900 - Index used to define the order of execution */
              order: 900,
              /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
              enabled: true,
              /** @prop {ModifierFn} */
              fn: applyStyle,
              /** @prop {Function} */
              onLoad: applyStyleOnLoad,
              /**
               * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
               * @prop {Boolean} gpuAcceleration=true
               * If true, it uses the CSS 3d transformation to position the popper.
               * Otherwise, it will use the `top` and `left` properties.
               */
              gpuAcceleration: undefined
          }
      };
  
      /**
       * The `dataObject` is an object containing all the informations used by Popper.js
       * this object get passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
       * @name dataObject
       * @property {Object} data.instance The Popper.js instance
       * @property {String} data.placement Placement applied to popper
       * @property {String} data.originalPlacement Placement originally defined on init
       * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
       * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper.
       * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
       * @property {Object} data.styles Any CSS property defined here will be applied to the popper, it expects the JavaScript nomenclature (eg. `marginBottom`)
       * @property {Object} data.boundaries Offsets of the popper boundaries
       * @property {Object} data.offsets The measurements of popper, reference and arrow elements.
       * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
       * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
       * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
       */
  
      /**
       * Default options provided to Popper.js constructor.<br />
       * These can be overriden using the `options` argument of Popper.js.<br />
       * To override an option, simply pass as 3rd argument an object with the same
       * structure of this object, example:
       * ```
       * new Popper(ref, pop, {
       *   modifiers: {
       *     preventOverflow: { enabled: false }
       *   }
       * })
       * ```
       * @type {Object}
       * @static
       * @memberof Popper
       */
      var Defaults = {
          /**
           * Popper's placement
           * @prop {Popper.placements} placement='bottom'
           */
          placement: 'bottom',
  
          /**
           * Whether events (resize, scroll) are initially enabled
           * @prop {Boolean} eventsEnabled=true
           */
          eventsEnabled: true,
  
          /**
           * Set to true if you want to automatically remove the popper when
           * you call the `destroy` method.
           * @prop {Boolean} removeOnDestroy=false
           */
          removeOnDestroy: false,
  
          /**
           * Callback called when the popper is created.<br />
           * By default, is set to no-op.<br />
           * Access Popper.js instance with `data.instance`.
           * @prop {onCreate}
           */
          onCreate: function onCreate() { },
  
          /**
           * Callback called when the popper is updated, this callback is not called
           * on the initialization/creation of the popper, but only on subsequent
           * updates.<br />
           * By default, is set to no-op.<br />
           * Access Popper.js instance with `data.instance`.
           * @prop {onUpdate}
           */
          onUpdate: function onUpdate() { },
  
          /**
           * List of modifiers used to modify the offsets before they are applied to the popper.
           * They provide most of the functionalities of Popper.js
           * @prop {modifiers}
           */
          modifiers: modifiers
      };
  
      /**
       * @callback onCreate
       * @param {dataObject} data
       */
  
      /**
       * @callback onUpdate
       * @param {dataObject} data
       */
  
      // Utils
      // Methods
      var Popper = function () {
          /**
           * Create a new Popper.js instance
           * @class Popper
           * @param {HTMLElement|referenceObject} reference - The reference element used to position the popper
           * @param {HTMLElement} popper - The HTML element used as popper.
           * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
           * @return {Object} instance - The generated Popper.js instance
           */
          function Popper(reference, popper) {
              var _this = this;
  
              var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
              classCallCheck(this, Popper);
  
              this.scheduleUpdate = function () {
                  return requestAnimationFrame(_this.update);
              };
  
              // make update() debounced, so that it only runs at most once-per-tick
              this.update = debounce(this.update.bind(this));
  
              // with {} we create a new object with the options inside it
              this.options = _extends({}, Popper.Defaults, options);
  
              // init state
              this.state = {
                  isDestroyed: false,
                  isCreated: false,
                  scrollParents: []
              };
  
              // get reference and popper elements (allow jQuery wrappers)
              this.reference = reference.jquery ? reference[0] : reference;
              this.popper = popper.jquery ? popper[0] : popper;
  
              // Deep merge modifiers options
              this.options.modifiers = {};
              Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(function (name) {
                  _this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});
              });
  
              // Refactoring modifiers' list (Object => Array)
              this.modifiers = Object.keys(this.options.modifiers).map(function (name) {
                  return _extends({
                      name: name
                  }, _this.options.modifiers[name]);
              })
                  // sort the modifiers by order
                  .sort(function (a, b) {
                      return a.order - b.order;
                  });
  
              // modifiers have the ability to execute arbitrary code when Popper.js get inited
              // such code is executed in the same order of its modifier
              // they could add new properties to their options configuration
              // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
              this.modifiers.forEach(function (modifierOptions) {
                  if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
                      modifierOptions.onLoad(_this.reference, _this.popper, _this.options, modifierOptions, _this.state);
                  }
              });
  
              // fire the first update to position the popper in the right place
              this.update();
  
              var eventsEnabled = this.options.eventsEnabled;
              if (eventsEnabled) {
                  // setup event listeners, they will take care of update the position in specific situations
                  this.enableEventListeners();
              }
  
              this.state.eventsEnabled = eventsEnabled;
          }
  
          // We can't use class properties because they don't get listed in the
          // class prototype and break stuff like Sinon stubs
  
  
          createClass(Popper, [{
              key: 'update',
              value: function update$$1() {
                  return update.call(this);
              }
          }, {
              key: 'destroy',
              value: function destroy$$1() {
                  return destroy.call(this);
              }
          }, {
              key: 'enableEventListeners',
              value: function enableEventListeners$$1() {
                  return enableEventListeners.call(this);
              }
          }, {
              key: 'disableEventListeners',
              value: function disableEventListeners$$1() {
                  return disableEventListeners.call(this);
              }
  
              /**
               * Schedule an update, it will run on the next UI update available
               * @method scheduleUpdate
               * @memberof Popper
               */
  
  
              /**
               * Collection of utilities useful when writing custom modifiers.
               * Starting from version 1.7, this method is available only if you
               * include `popper-utils.js` before `popper.js`.
               *
               * **DEPRECATION**: This way to access PopperUtils is deprecated
               * and will be removed in v2! Use the PopperUtils module directly instead.
               * Due to the high instability of the methods contained in Utils, we can't
               * guarantee them to follow semver. Use them at your own risk!
               * @static
               * @private
               * @type {Object}
               * @deprecated since version 1.8
               * @member Utils
               * @memberof Popper
               */
  
          }]);
          return Popper;
      }();
  
      /**
       * The `referenceObject` is an object that provides an interface compatible with Popper.js
       * and lets you use it as replacement of a real DOM node.<br />
       * You can use this method to position a popper relatively to a set of coordinates
       * in case you don't have a DOM node to use as reference.
       *
       * ```
       * new Popper(referenceObject, popperNode);
       * ```
       *
       * NB: This feature isn't supported in Internet Explorer 10
       * @name referenceObject
       * @property {Function} data.getBoundingClientRect
       * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
       * @property {number} data.clientWidth
       * An ES6 getter that will return the width of the virtual reference element.
       * @property {number} data.clientHeight
       * An ES6 getter that will return the height of the virtual reference element.
       */
  
  
      Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
      Popper.placements = placements;
      Popper.Defaults = Defaults;
  
      return Popper;
  
  })));
  //# sourceMappingURL=popper.js.map
  