app.js

import $ from 'jquery';

console.log($);
setTimeout(function() {
  debugger;
  'lol';
}, 1000);

index.html

<script src="https://jspm.io/system@0.4.js"></script>

<script>
System.paths['*'] = '/*.js';
System.map['jquery'] = 'npm:jquery';
System.import('app');
</script>

download and run from a static web server ($ npm install -g http-server; $ http-server)