Can the .show() method be smarter about its return type?

[cssinate]

https://github.com/eBay/nice-modal-react/blob/979c283892c4f16a4a2d5ecf582d1500eca3807a/src/index.tsx#L216

Right now, the .show() method always returns Promise<unknown>. If I'm not mistaken, whatever I end up passing into .resolve() is what gets returned to .show().

I'm only still learning TypeScript, but can't you use generics to accept a type? Right now, I'm having to do a manual type-check method in order to assert my return type. It feels like I shouldn't have to do that.

For example, if when constructing the modal, you do

modal.resolve(true)

In the app when you do

modal.show().then((res) => whatever...

TypeScript thinks res is unknown. Surely there's a way I can assert that it's a boolean?