private processRoutes(ngModule: NgModuleRef<any>, routes: Routes): Observable<void> {
    const res: Observable<any>[] = [];
    for (const route of routes) {
      // we already have the config loaded, just recurse
      if (route.loadChildren && !route.canLoad && route._loadedConfig) {
        const childConfig = route._loadedConfig;
        res.push(this.processRoutes(childConfig.module, childConfig.routes));

        // no config loaded, fetch the config
      } else if (route.loadChildren && !route.canLoad) {
        res.push(this.preloadConfig(ngModule, route));

        // recurse into children
      } else if (route.children) {
        res.push(this.processRoutes(ngModule, route.children));
      }
    }
    return mergeAll.call(from(res));
  }

export function andObservables(observables: Observable<Observable<any>>): Observable<boolean> {
  const merged$ = mergeAll.call(observables);
  return every.call(merged$, (result: any) => result === true);
}