old_contents: /*jslint browser */
  /*global require */
  (function () {
  
      "use strict";
  
      let jQuery = require("jquery");
      jQuery(function onDOMContentLoaded() {
  
          // Polyfill picture element
          require("picturefill");
  
          // And remember your semi-colons
  
      });
  }());
  
new_contents: /*jslint browser */
  /*global require */
  (function () {
  
      "use strict";
  
      const jquery = require("jquery");
      jquery(function onDOMContentLoaded() {
  
          // Polyfill picture element
          require("picturefill");
  
          // And remember your semi-colons
  
      });
  }());
  
subject: Use const for library