How to use the @terrestris/ol-util/dist/MapUtil/MapUtil.getLayerPositionInfo function in @terrestris/ol-util

onDrop(e: AntTreeNodeDropEvent) {
    const dragLayer = MapUtil.getLayerByOlUid(this.props.map, e.dragNode.props.eventKey);
    const dragInfo = MapUtil.getLayerPositionInfo(dragLayer, this.props.map);
    const dragCollection = dragInfo.groupLayer.getLayers();
    const dropLayer = MapUtil.getLayerByOlUid(this.props.map, e.node.props.eventKey);
    const dropPos = e.node.props.pos.split('-');
    const location = e.dropPosition - Number(dropPos[dropPos.length - 1]);

    dragCollection.remove(dragLayer);

    const dropInfo = MapUtil.getLayerPositionInfo(dropLayer, this.props.map);
    const dropPosition = dropInfo.position;
    const dropCollection = dropInfo.groupLayer.getLayers();

    // drop before node
    if (location === -1) {
      if (dropPosition === dropCollection.getLength() - 1) {
        dropCollection.push(dragLayer);
      } else {

onDrop(e: AntTreeNodeDropEvent) {
    const dragLayer = MapUtil.getLayerByOlUid(this.props.map, e.dragNode.props.eventKey);
    const dragInfo = MapUtil.getLayerPositionInfo(dragLayer, this.props.map);
    const dragCollection = dragInfo.groupLayer.getLayers();
    const dropLayer = MapUtil.getLayerByOlUid(this.props.map, e.node.props.eventKey);
    const dropPos = e.node.props.pos.split('-');
    const location = e.dropPosition - Number(dropPos[dropPos.length - 1]);

    dragCollection.remove(dragLayer);

    const dropInfo = MapUtil.getLayerPositionInfo(dropLayer, this.props.map);
    const dropPosition = dropInfo.position;
    const dropCollection = dropInfo.groupLayer.getLayers();

    // drop before node
    if (location === -1) {
      if (dropPosition === dropCollection.getLength() - 1) {
        dropCollection.push(dragLayer);
      } else {
        dropCollection.insertAt(dropPosition + 1, dragLayer);
      }
      // drop on node
    } else if (location === 0) {
      if (dropLayer instanceof OlLayerGroup) {
        dropLayer.getLayers().push(dragLayer);
      } else {
        dropCollection.insertAt(dropPosition + 1, dragLayer);