partywhen: Some methods incorrectly return 'never' in TypeScript

I tried to use this in a project, but am finding it difficult to get it working due to incorrect return types on some methods:

Any idea how to fix this?

Repro here: https://github.com/jahands/partywhen-typescript-repro/blob/main/src/index.ts

To test, run `pnpm install` and then hover over the `scheduler.scheduleTask()` call in `index.ts`