Cheerio Error: ReferenceError: $ is not defined

I am trying to iterate over table rows.But when I use $ to find an element from inside the .each function,it raises the above error.

var $ = cheerio.load(html);
.....
var headers = $('[id*=tableone] tbody tr')

 headers.each(function(header_index, header_elem){
    console.log($(header_elem))                         => exception here
   })

via Jaswinder