_slide()

in src/site/assets/js/bootstrap.bundle.js [1414:1496]
62 lines of code
13 McCabe index (conditional complexity)

    _slide(directionOrOrder, element) {
      const order = this._directionToOrder(directionOrOrder);

      const activeElement = SelectorEngine.findOne(SELECTOR_ACTIVE_ITEM, this._element);

      const activeElementIndex = this._getItemIndex(activeElement);

      const nextElement = element || this._getItemByOrder(order, activeElement);

      const nextElementIndex = this._getItemIndex(nextElement);

      const isCycling = Boolean(this._interval);
      const isNext = order === ORDER_NEXT;
      const directionalClassName = isNext ? CLASS_NAME_START : CLASS_NAME_END;
      const orderClassName = isNext ? CLASS_NAME_NEXT : CLASS_NAME_PREV;

      const eventDirectionName = this._orderToDirection(order);

      if (nextElement && nextElement.classList.contains(CLASS_NAME_ACTIVE$2)) {
        this._isSliding = false;
        return;
      }

      if (this._isSliding) {
        return;
      }

      const slideEvent = this._triggerSlideEvent(nextElement, eventDirectionName);

      if (slideEvent.defaultPrevented) {
        return;
      }

      if (!activeElement || !nextElement) {
        // Some weirdness is happening, so we bail
        return;
      }

      this._isSliding = true;

      if (isCycling) {
        this.pause();
      }

      this._setActiveIndicatorElement(nextElement);

      this._activeElement = nextElement;

      const triggerSlidEvent = () => {
        EventHandler.trigger(this._element, EVENT_SLID, {
          relatedTarget: nextElement,
          direction: eventDirectionName,
          from: activeElementIndex,
          to: nextElementIndex
        });
      };

      if (this._element.classList.contains(CLASS_NAME_SLIDE)) {
        nextElement.classList.add(orderClassName);
        reflow(nextElement);
        activeElement.classList.add(directionalClassName);
        nextElement.classList.add(directionalClassName);

        const completeCallBack = () => {
          nextElement.classList.remove(directionalClassName, orderClassName);
          nextElement.classList.add(CLASS_NAME_ACTIVE$2);
          activeElement.classList.remove(CLASS_NAME_ACTIVE$2, orderClassName, directionalClassName);
          this._isSliding = false;
          setTimeout(triggerSlidEvent, 0);
        };

        this._queueCallback(completeCallBack, activeElement, true);
      } else {
        activeElement.classList.remove(CLASS_NAME_ACTIVE$2);
        nextElement.classList.add(CLASS_NAME_ACTIVE$2);
        this._isSliding = false;
        triggerSlidEvent();
      }

      if (isCycling) {
        this.cycle();
      }
    }