Describe the problem

I want to use the handleError hook of SvelteKit, but I realized that it currently has to be a synchronous function. But unfortunately, our error mapper is an asynchronous function. Since it is not possible in JavaScript to synchronously await an asynchronous function (like in C#), it seems we cannot use the handleError hook currently.

Describe the proposed solution

Make the return type of HandleServerError and HandleClientError a MaybePromise, like the handle-hook.

export interface HandleServerError {
  (input: { error: unknown; event: RequestEvent }): MaybePromise<void | App.Error>;
}

export interface HandleClientError {
  (input: { error: unknown; event: NavigationEvent }): MaybePromise<void | App.Error>;
}

Alternatives considered

Continue not to use handleError.

Importance

would make my life easier

Additional Information

No response