How to use the @bentley/presentation-frontend.SelectionHelper.getKeysForSelection function in @bentley/presentation-frontend

protected getKeys(nodes: TreeNodeItem[]): Keys {
    const nodeKeys: NodeKey[] = nodes.map((node) => this._dataProvider.getNodeKey(node));
    return SelectionHelper.getKeysForSelection(nodeKeys);
  }

private getKeys(nodes: TreeNodeItem[]): Keys {
      const nodeKeys: NodeKey[] = nodes.map((node) => this.props.dataProvider.getNodeKey(node));
      return SelectionHelper.getKeysForSelection(nodeKeys);
    }