Usage with Angular2 component generates exception....

[MHacker9404]

I have created a menu component for my Angular2 app as such:

import { AfterViewInit, Component } from '@angular/core';
import * as $ from 'jquery/dist/jquery.min.js';
import 'bootstrap/dist/js/bootstrap';
import 'bootstrap-submenu/dist/js/bootstrap-submenu';

require("style-loader!bootstrap-submenu/dist/css/bootstrap-submenu.min.css");

@Component({
  selector: 'app-menu',
  templateUrl: './menu.component.html',
  styleUrls: ['./menu.component.scss']
})
export class MenuComponent implements AfterViewInit {

  private _subMenu: any;

  constructor() { }

  ngAfterViewInit() {

      this._subMenu = $('[data-submenu]');
      console.log(this._subMenu);

      $('[data-submenu]').submenupicker();
  }
}

But when I run the app - I get the following exception:
query_dist_jquery_min_js__(...).submenupicker is not a function ;

So what am I doing wrong?