Server listen hook

[MoritzLoewenstein]

Describe the problem

I want to register webhooks on application start, but the webhook creation request requires response to a PING request. The init hook fires before http server start (adapter-node), so sveltekit can not answer the request yet and the webhook creation fails.

Describe the proposed solution

I would like to see a listen hook (hook.server.js) that fires as soon as SvelteKit is ready to receive requests.

Alternatives considered

I am currently using the init hook with a setTimeout.

Importance

would make my life easier

Additional Information

Not sure how this would work on serverless / edge platforms, but I think this would be very useful on standalone runtimes.

[elliott-with-the-longest-name-on-github]

Seems like you need to use handle.js with a custom server?: https://svelte.dev/docs/kit/adapter-node#Custom-server

[MoritzLoewenstein]

That would work, thanks.
Would you still accept a pr for a server hook like this or is this not wanted?
Using a custom server feels like a workaround (as the docs state, would need to re-implement the env variable handling etc.).

[elliott-with-the-longest-name-on-github]

We're typically a bit resistant to adding API surface area that's not clearly beneficial to all of the platforms that SvelteKit can deploy to, so I don't know that this would be very useful as an addition to Svelte core... that being said, we can definitely discuss it. It seems like a very narrowly useful feature for an entire new hook, though.

[MoritzLoewenstein]

Without adding a new hook I thought of something like this:

// `init` hook type
- export type ServerInit = () => MaybePromise<void>;
+ export type ServerInit = (options: {
+ 	server?: {
+ 			onListen: (callback: () => MaybePromise<void>) => void;
+ 	};
+ }) => MaybePromise<void>;

Of course I understand if this is too specific / platform dependent.