Worker call to main ("the other way around") doesn't work in node?

I've tried to implement the solution in https://github.com/GoogleChromeLabs/comlink/issues/506#issuecomment-753457080, but that doesn't seem to work in node.

Because nodejs doesn't have a "self" context, I've tried using "globalThis" instead, but when I run it it still throws a "self is not defined" error (from the expose function in comlink).

In my `main.ts` file I've tried:
```ts
const worker = new Worker(filename);
const obj = Comlink.wrap(nodeEndpoint(worker)) as unknown as Engine;

Comlink.expose(this.engine, nodeEndpoint(worker));
```

and in my worker file I have tried:
```ts
Comlink.wrap(globalThis) as unknown as Engine;
```

I suspect the issue is with `Comlink.expose(this.engine, nodeEndpoint(worker));` and the nodeEndpoint part but I can't figure it out.