docs: function fetchUnmetDependencies() {
          var runAgain = false;
          for (var id in dependencyMap) {
              _.forEach(dependencyMap[id], function (depId) {
                  if (!dependencyMap[depId] && !injectedMap[depId]) {
                      try {
                          loadExternalModule(id, depId);
                      } catch (err) {
                          throw new Error('Error loading dependency ' + depId + ' for ' + id + ': ' + err.message);
                      }
  
                      runAgain = true;
                  }
              });
          }
  
          if (runAgain) { //continue until all we don't have any more unmet dependencies
              fetchUnmetDependencies();
          }
      }