(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('jquery'), require('./util.js')) :
  typeof define === 'function' && define.amd ? define(['jquery', './util.js'], factory) :
  (global.ScrollSpy = factory(global.jQuery,global.Util));
}(this, (function ($,Util) { 'use strict';

  $ = $ && $.hasOwnProperty('default') ? $['default'] : $;
  Util = Util && Util.hasOwnProperty('default') ? Util['default'] : Util;

  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);
    }
  }

  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    return Constructor;
  }

  function _defineProperty(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;
  }

  function _objectSpread(target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i] != null ? arguments[i] : {};
      var ownKeys = Object.keys(source);

      if (typeof Object.getOwnPropertySymbols === 'function') {
        ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) {
          return Object.getOwnPropertyDescriptor(source, sym).enumerable;
        }));
      }

      ownKeys.forEach(function (key) {
        _defineProperty(target, key, source[key]);
      });
    }

    return target;
  }

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v4.1.3): scrollspy.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */

  var ScrollSpy = function ($$$1) {
    /**
     * ------------------------------------------------------------------------
     * Constants
     * ------------------------------------------------------------------------
     */
    var NAME = 'scrollspy';
    var VERSION = '4.1.3';
    var DATA_KEY = 'bs.scrollspy';
    var EVENT_KEY = "." + DATA_KEY;
    var DATA_API_KEY = '.data-api';
    var JQUERY_NO_CONFLICT = $$$1.fn[NAME];
    var Default = {
      offset: 10,
      method: 'auto',
      target: ''
    };
    var DefaultType = {
      offset: 'number',
      method: 'string',
      target: '(string|element)'
    };
    var Event = {
      ACTIVATE: "activate" + EVENT_KEY,
      SCROLL: "scroll" + EVENT_KEY,
      LOAD_DATA_API: "load" + EVENT_KEY + DATA_API_KEY
    };
    var ClassName = {
      DROPDOWN_ITEM: 'dropdown-item',
      DROPDOWN_MENU: 'dropdown-menu',
      ACTIVE: 'active'
    };
    var Selector = {
      DATA_SPY: '[data-spy="scroll"]',
      ACTIVE: '.active',
      NAV_LIST_GROUP: '.nav, .list-group',
      NAV_LINKS: '.nav-link',
      NAV_ITEMS: '.nav-item',
      LIST_ITEMS: '.list-group-item',
      DROPDOWN: '.dropdown',
      DROPDOWN_ITEMS: '.dropdown-item',
      DROPDOWN_TOGGLE: '.dropdown-toggle'
    };
    var OffsetMethod = {
      OFFSET: 'offset',
      POSITION: 'position'
      /**
       * ------------------------------------------------------------------------
       * Class Definition
       * ------------------------------------------------------------------------
       */

    };

    var ScrollSpy =
    /*#__PURE__*/
    function () {
      function ScrollSpy(element, config) {
        var _this = this;

        this._element = element;
        this._scrollElement = element.tagName === 'BODY' ? window : element;
        this._config = this._getConfig(config);
        this._selector = this._config.target + " " + Selector.NAV_LINKS + "," + (this._config.target + " " + Selector.LIST_ITEMS + ",") + (this._config.target + " " + Selector.DROPDOWN_ITEMS);
        this._offsets = [];
        this._targets = [];
        this._activeTarget = null;
        this._scrollHeight = 0;
        $$$1(this._scrollElement).on(Event.SCROLL, function (event) {
          return _this._process(event);
        });
        this.refresh();

        this._process();
      } // Getters


      var _proto = ScrollSpy.prototype;

      // Public
      _proto.refresh = function refresh() {
        var _this2 = this;

        var autoMethod = this._scrollElement === this._scrollElement.window ? OffsetMethod.OFFSET : OffsetMethod.POSITION;
        var offsetMethod = this._config.method === 'auto' ? autoMethod : this._config.method;
        var offsetBase = offsetMethod === OffsetMethod.POSITION ? this._getScrollTop() : 0;
        this._offsets = [];
        this._targets = [];
        this._scrollHeight = this._getScrollHeight();
        var targets = [].slice.call(document.querySelectorAll(this._selector));
        targets.map(function (element) {
          var target;
          var targetSelector = Util.getSelectorFromElement(element);

          if (targetSelector) {
            target = document.querySelector(targetSelector);
          }

          if (target) {
            var targetBCR = target.getBoundingClientRect();

            if (targetBCR.width || targetBCR.height) {
              // TODO (fat): remove sketch reliance on jQuery position/offset
              return [$$$1(target)[offsetMethod]().top + offsetBase, targetSelector];
            }
          }

          return null;
        }).filter(function (item) {
          return item;
        }).sort(function (a, b) {
          return a[0] - b[0];
        }).forEach(function (item) {
          _this2._offsets.push(item[0]);

          _this2._targets.push(item[1]);
        });
      };

      _proto.dispose = function dispose() {
        $$$1.removeData(this._element, DATA_KEY);
        $$$1(this._scrollElement).off(EVENT_KEY);
        this._element = null;
        this._scrollElement = null;
        this._config = null;
        this._selector = null;
        this._offsets = null;
        this._targets = null;
        this._activeTarget = null;
        this._scrollHeight = null;
      }; // Private


      _proto._getConfig = function _getConfig(config) {
        config = _objectSpread({}, Default, typeof config === 'object' && config ? config : {});

        if (typeof config.target !== 'string') {
          var id = $$$1(config.target).attr('id');

          if (!id) {
            id = Util.getUID(NAME);
            $$$1(config.target).attr('id', id);
          }

          config.target = "#" + id;
        }

        Util.typeCheckConfig(NAME, config, DefaultType);
        return config;
      };

      _proto._getScrollTop = function _getScrollTop() {
        return this._scrollElement === window ? this._scrollElement.pageYOffset : this._scrollElement.scrollTop;
      };

      _proto._getScrollHeight = function _getScrollHeight() {
        return this._scrollElement.scrollHeight || Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
      };

      _proto._getOffsetHeight = function _getOffsetHeight() {
        return this._scrollElement === window ? window.innerHeight : this._scrollElement.getBoundingClientRect().height;
      };

      _proto._process = function _process() {
        var scrollTop = this._getScrollTop() + this._config.offset;

        var scrollHeight = this._getScrollHeight();

        var maxScroll = this._config.offset + scrollHeight - this._getOffsetHeight();

        if (this._scrollHeight !== scrollHeight) {
          this.refresh();
        }

        if (scrollTop >= maxScroll) {
          var target = this._targets[this._targets.length - 1];

          if (this._activeTarget !== target) {
            this._activate(target);
          }

          return;
        }

        if (this._activeTarget && scrollTop < this._offsets[0] && this._offsets[0] > 0) {
          this._activeTarget = null;

          this._clear();

          return;
        }

        var offsetLength = this._offsets.length;

        for (var i = offsetLength; i--;) {
          var isActiveTarget = this._activeTarget !== this._targets[i] && scrollTop >= this._offsets[i] && (typeof this._offsets[i + 1] === 'undefined' || scrollTop < this._offsets[i + 1]);

          if (isActiveTarget) {
            this._activate(this._targets[i]);
          }
        }
      };

      _proto._activate = function _activate(target) {
        this._activeTarget = target;

        this._clear();

        var queries = this._selector.split(','); // eslint-disable-next-line arrow-body-style


        queries = queries.map(function (selector) {
          return selector + "[data-target=\"" + target + "\"]," + (selector + "[href=\"" + target + "\"]");
        });
        var $link = $$$1([].slice.call(document.querySelectorAll(queries.join(','))));

        if ($link.hasClass(ClassName.DROPDOWN_ITEM)) {
          $link.closest(Selector.DROPDOWN).find(Selector.DROPDOWN_TOGGLE).addClass(ClassName.ACTIVE);
          $link.addClass(ClassName.ACTIVE);
        } else {
          // Set triggered link as active
          $link.addClass(ClassName.ACTIVE); // Set triggered links parents as active
          // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor

          $link.parents(Selector.NAV_LIST_GROUP).prev(Selector.NAV_LINKS + ", " + Selector.LIST_ITEMS).addClass(ClassName.ACTIVE); // Handle special case when .nav-link is inside .nav-item

          $link.parents(Selector.NAV_LIST_GROUP).prev(Selector.NAV_ITEMS).children(Selector.NAV_LINKS).addClass(ClassName.ACTIVE);
        }

        $$$1(this._scrollElement).trigger(Event.ACTIVATE, {
          relatedTarget: target
        });
      };

      _proto._clear = function _clear() {
        var nodes = [].slice.call(document.querySelectorAll(this._selector));
        $$$1(nodes).filter(Selector.ACTIVE).removeClass(ClassName.ACTIVE);
      }; // Static


      ScrollSpy._jQueryInterface = function _jQueryInterface(config) {
        return this.each(function () {
          var data = $$$1(this).data(DATA_KEY);

          var _config = typeof config === 'object' && config;

          if (!data) {
            data = new ScrollSpy(this, _config);
            $$$1(this).data(DATA_KEY, data);
          }

          if (typeof config === 'string') {
            if (typeof data[config] === 'undefined') {
              throw new TypeError("No method named \"" + config + "\"");
            }

            data[config]();
          }
        });
      };

      _createClass(ScrollSpy, null, [{
        key: "VERSION",
        get: function get() {
          return VERSION;
        }
      }, {
        key: "Default",
        get: function get() {
          return Default;
        }
      }]);

      return ScrollSpy;
    }();
    /**
     * ------------------------------------------------------------------------
     * Data Api implementation
     * ------------------------------------------------------------------------
     */


    $$$1(window).on(Event.LOAD_DATA_API, function () {
      var scrollSpys = [].slice.call(document.querySelectorAll(Selector.DATA_SPY));
      var scrollSpysLength = scrollSpys.length;

      for (var i = scrollSpysLength; i--;) {
        var $spy = $$$1(scrollSpys[i]);

        ScrollSpy._jQueryInterface.call($spy, $spy.data());
      }
    });
    /**
     * ------------------------------------------------------------------------
     * jQuery
     * ------------------------------------------------------------------------
     */

    $$$1.fn[NAME] = ScrollSpy._jQueryInterface;
    $$$1.fn[NAME].Constructor = ScrollSpy;

    $$$1.fn[NAME].noConflict = function () {
      $$$1.fn[NAME] = JQUERY_NO_CONFLICT;
      return ScrollSpy._jQueryInterface;
    };

    return ScrollSpy;
  }($);

  return ScrollSpy;

})));
