• Install JQuery:

npm install --save jquery

• Import to our file:

import * as $ from 'jquery'

• Import library in index.html:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

• Declare $ variable at top of any file where we want to use it:

declare let $: any

Same as JQuery

Note that when using a library through CDN, we can not test our code because of Reference error