this._addTouchEventListeners()\n    }\n  }\n\n  _addTouchEventListeners() {\n    if (!this._touchSupported) {\n      return\n    }\n\n    const start = event => {\n      if (this._pointerEvent && PointerType[event.originalEvent.pointerType.toUpperCase()]) {\n        this.touchStartX = event.originalEvent.clientX\n      } else if (!this._pointerEvent) {\n        this.touchStartX = event.originalEvent.touches[0].clientX\n      }\n    }\n\n    const move = event => {\n      // ensure swiping with one touch and not...