Re: [w3c/ServiceWorker] The return value for update() is wrong in WebIDL (#1472)

yoshisatoyanagisawa left a comment (w3c/ServiceWorker#1472)

I am not sure either [PR](https://github.com/w3c/ServiceWorker/pull/1771) or here to reply, but let me reply here.

As I mentioned in https://github.com/w3c/ServiceWorker/issues/1472#issuecomment-2840469985, update() returns the promise that will be resolved with `ServiceWorkerRegistration`.  Let me explain one by one.

This is the update() algorithm you might have already seen.
https://w3c.github.io/ServiceWorker/#service-worker-registration-update

In the algorithm, it creates `promise`, and the `promise` is passed to `CreateJob`.  The returned `job` has the promise inside.
https://w3c.github.io/ServiceWorker/#create-job

Then the `job` will be passed to ScheduleJob
https://w3c.github.io/ServiceWorker/#schedule-job

RunJob will eventually be called.
https://w3c.github.io/ServiceWorker/#run-job-algorithm

Since this is Update, Update will eventually be called.
https://w3c.github.io/ServiceWorker/#update

Install will eventually be called if not promise rejected.
https://w3c.github.io/ServiceWorker/#install

In Step 7, [Resolve Job Promise](https://w3c.github.io/ServiceWorker/#resolve-job-promise) is called.
In the algorithm, `job`'s promise will eventually be resolved by convertedValue, it is always be the return value of [the service worker registration object](https://w3c.github.io/ServiceWorker/#get-the-service-worker-registration-object), and you can see [ServiceWorkerRegistration](https://w3c.github.io/ServiceWorker/#serviceworkerregistration) is returned.
Therefore, it is always be `ServiceWorkerRegistration` or rejected.

Please feel free to ask questions if something not clear.

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