get visibleItemsIndices() {
      const visibleItemsIndices = [];
      this.items.forEach((item, index) => {
        if (this.isItemInViewport(index)) {
          visibleItemsIndices.push(index);
        }
      });
      return visibleItemsIndices;
    }
The indices of the currently visible items of the component.
@public
@readonly
@since 1.0.0-rc.15
@returns {Integer[]} the indices of the visible items