code: function(x, reload){
          
          // Get the numeric ID for the module to load.
          var id = modules[name][1][x];
          
          // If there's a matching module in the testability cache, return it.
          if (_testability_cache_[x]) return _testability_cache_[x];
          
          // Return recursively... the module's export will be in the cache 
          // after this.
          return newRequire(id ? id : x, undefined, reload);
        }
docs: Create the require function for this module.