What does the resolve function do in the context of subscriptions?

[jens1101]

I regularly see subscription code using a Repeater instance and all of them have a resolve function alongside the subscribe function (example from the docs). However, I have noticed that if I use an async generator then that resolve function is not necessary (example from the docs).

I also get a type error if I use a repeater without a resolve function, whereas that doesn't happen when using an async generator. It is clear to that the function must be important.

My question is:

• What is the purpose of the resolve function?
• If my repeater yields the correct data type that's expected then is it possible to omit the usage of the resolve function without triggering a TS error?