energylink/public/app/core/routes/bundle_loader.ts

export class BundleLoader {
  lazy: any;

  constructor(bundleName) {
    var defer = null;

    this.lazy = ["$q", "$route", "$rootScope", ($q, $route, $rootScope) => {
      if (defer) {
        return defer.promise;
      }

      defer = $q.defer();

      System.import(bundleName).then(() => {
        defer.resolve();
      });

      return defer.promise;
    }];

  }
}