gistfile1.js

   function nextRequire(prevWorkDone) {
      if(requires.length) {
        return stage(requires.shift(), true, options).then(function(workDone) {
          anyWorkDone = anyWorkDone || workDone;
          return nextRequire();
        });
      } else {
        return work(rules, options, isChild, anyWorkDone);
      }
    }  
    return nextRequire();