How to use the @angular/service-worker/worker.rewriteUrlInstruction function in @angular/service-worker

const config = manifest.routes[route];
      if (config['match']) {
        const matcher = new UrlMatcher(route, config as UrlConfig, this.worker.adapter.scope);
        return matcher.matches(req.url);
      } else {
        const oldConfig = config as RouteConfig;
        const matchesPath = oldConfig.prefix
          ? path.indexOf(route) === 0
          : path === route;
        const matchesPathAndExtension = matchesPath &&
            (!oldConfig.onlyWithoutExtension || !this.hasExtension(path));
        return matchesPathAndExtension;
      }
    });
    if (matchesRoutingTable) {
      return rewriteUrlInstruction(this.worker, req, base + manifest.index);
    } else {
      return null;
    }
  }
}