If I call

refresh()

on a stack that doesn't exist, what happens? Is that an error or no-op? (Using TypeScript if it matters)

You will get an error if you try to

select

a stack that does not exist. If you refresh a stack that has been created, but contains no resources it will be a no-op effectively.

Cool, fortunately the examples call

createOrSelectStack

(which I used as a starting point) so I think I'm good.