How to Unselect Selected Item in JavaScript ListBox

import { enableRipple } from "@syncfusion/ej2-base";
enableRipple(true);
 
import { ListBox, ListBoxChangeEventArgs } from "@syncfusion/ej2-dropdowns";
import * as data from "./datasource.json";
 
// Initialize the ListBox component.
let listObj: ListBox = new ListBox({
  // Set the info to the dataSource property.
  dataSource: (data as any).info,
  selectionSettings: { mode: "Multiple" },
  change: onChange
});
let element: Element[];
let item: string[] = [];
function onChange(args: ListBoxChangeEventArgs): void {
  if (element && args.elements.length == 1 && element[0] == args.elements[0]) {
    for (var i = 0; i < args.items.length; i++) {
      item[i] = args.value[i];
    }
    listObj.selectItems(item, false);
    element = null;
  } else {
    element = args.elements;
  }
}
listObj.appendTo("#multi-select-listbox");