# Interface: `IOptions` [@jupyterlite/server](../modules/jupyterlite_server.md).[IServiceWorkerManager](../modules/jupyterlite_server.IServiceWorkerManager.md).IOptions An options object for initializing a worker manager. ## Properties ### `workerUrl` > > `Optional` **`workerUrl`**: `string` URL to load the worker file. Default to "{baseURL}/service-worker.js" #### Defined in [packages/server/src/tokens.ts:48](https://github.com/jupyterlite/jupyterlite/blob/999c7f0/packages/server/src/tokens.ts#L48)