justJust write
declare var $:any;
declare var $:any;
after all import sectionsections, you can use JqueryjQuery and include Jquerythe jQuery library in your index.html page
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
it worked for me