What is the correct way to terminate a worker via Thread and BlobWorker?

I instantiate a worker:

```
import { spawn, Thread, BlobWorker } from 'threads';
import MyWorkerWeb from 'raw-loader!../dist/worker.js';

let worker = spawn(BlobWorker.fromText(MyWorkerWeb));

//
// do stuff with worker
// ...
```

When I am done with the worker, I would like to terminate it to remove it from memory and from the list of dedicated workers in the Task Manager:

```
Thread.terminate(worker);
```

This line of code returns the following error:

```
thread[symbols_1.$terminate] is not a function
TypeError: thread[symbols_1.$terminate] is not a function
at Object.terminate (http://localhost:3000/static/js/src_App_js-data_image_svg_xml_3csvg_xmlns_27http_www_w3_org_2000_svg_27_viewBox_27-4_-4_8_8_2-577bb7.chunk.js:28287:48)
```

Is there a correct way to terminate this worker, which does not require reloading the document (web page)?

Thanks for your advice.