How to get last unchecked item in ngx-treeview?

Question

I am using npm module named as ngx-treeview . In this I can get the all selected items on change but not that one specific item which is getting changed. I am looking for uncheck.

In component.html file:

<ngx-treeview [config]="treeviewConfig" [items]="treeItems" [itemTemplate]="itemTemplate" (selectedChange)="onSelectedChange($event,$event)"></ngx-treeview>

In component.ts file: First I have imported the ngx-treeview as

import { TreeviewItem, TreeviewConfig, TreeviewHelper, TreeviewComponent, TreeviewEventParser, OrderDownlineTreeviewEventParser, DownlineTreeviewItem } from 'ngx-treeview/src';


// function to be called
public onSelectedChange(downlineItems: DownlineTreeviewItem[], item: TreeviewItem ) {
   console.log(downlineItems);

   console.log(item);
}

Can anyone please let me know how can I get just unchecked item's value?