code: function move(delta) {
      const { state } = this;
      const { index, items, itemsPerSlide, autoplayInterval, slideWidth, gap, peek, config } = state;
      const nextIndex = getNextIndex(state, delta);
      let offsetOverride;
  
      config.preserveItems = true;
      this.isMoving = true;
  
      // When we are in autoplay mode we overshoot the desired index to land on a clone
      // of one of the ends. Then after the transition is over we update to the proper position.
      if (autoplayInterval) {
          if (delta === RIGHT && nextIndex < index) {
              // Transitions to one slide before the beginning.
              offsetOverride = -slideWidth - gap;
  
              // Move the items in the last slide to be before the first slide.
              for (let i = Math.ceil(itemsPerSlide + peek); i--;) {
                  const item = items[items.length - i - 1];
                  item.transform = `translateX(${(getMaxOffset(state) + slideWidth + gap) * -1}px)`;
              }
          } else if (delta === LEFT && nextIndex > index) {
              // Transitions one slide past the end.
              offsetOverride = getMaxOffset(state) + slideWidth + gap;
  
              // Moves the items in the first slide to be after the last slide.
              for (let i = Math.ceil(itemsPerSlide + peek); i--;) {
                  const item = items[i];
                  item.transform = `translateX(${(getMaxOffset(state) + slideWidth + gap)}px)`;
              }
          }
  
          config.offsetOverride = offsetOverride;
      }
  
      this.setState('index', nextIndex);
      this.once('carousel-update', () => {
          this.isMoving = false;
  
          if (offsetOverride !== undefined) {
              // If we are in autoplay mode and went outside of the normal offset
              // We make sure to restore all of the items that got moved around.
              items.forEach(item => { item.transform = undefined; });
          }
      });
  
      return nextIndex;
  }
docs: Causes the carousel to move to the provided index.
  
  @param {-1|1} delta 1 for right and -1 for left.
  @return {number} the updated index.