title: '$' symbol in typescript class
body: <p>Why the '$' symbol is not recognized in typescript, since it is a super set of javascript? When I type for example <code>$('#example')</code> I have this error</p>
  
  <blockquote>
    <p>Cannot find name '$'</p>
  </blockquote>
  
  <p>but in the javascript file everything is ok and it works. Otherwise I'd like to know whether the function <code>document.getElementById("something")</code> has the same meaning, so I can replace easly the '$' symbol.</p>