code: function Popper(reference, popper) {
      var _this = this;
  
      var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
      classCallCheck(this, Popper);
  
      this.scheduleUpdate = function () {
        return requestAnimation(_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.defaultOptions = options;
      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 && reference.jquery ? reference[0] : reference;
      this.popper = popper && popper.jquery ? popper[0] : popper;
  
      this.updateModifiers();
  
      // 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;
    }
docs: 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