jQuery datepicker in SPFX

npm install jquery@2 --save
npm install jqueryui --save

npm install @types/jquery@2 --save
npm install @types/jqueryui --save

import { SPComponentLoader } from '@microsoft/sp-loader';
import * as $  from 'jquery';
import 'jqueryui';

 <input type="text" id="txtDate" >

public constructor() {
    super();
    SPComponentLoader.loadCss('//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css');
  }

public BindDatePicker()
  {
    $("#txtDate").datepicker();
  }