[FEATURE] [v7] Generic type for `serverError`

[Yanick van Barneveld]

Are you using the latest version of this library?

• I verified that the issue exists in the latest next-safe-action release

Is there an existing issue for this?

• I have searched the existing issues and found nothing that matches

Suggest an idea

I'm missing a way to return a serverError other than just a string. From my API, for example, I get back a code and message and I would like to get this back in my serverError. This is now only allowed to be of string type, unfortunately.

So I would like to make something like the following possible, where the serverError in my action/useAction would then also be of these different types and not just string.

export const action = createSafeActionClient({
	handleReturnedServerError(e) {
		if (e instanceof FetchError) {
			return {
				code: e.response?._data?.code,
				message: e.response?._data?.message,
				additional: e.response?._data?.additional,
			};
		}

		if (e instanceof CustomOtherError) {
			return {
				instance: e.response?._data?.instance,
				response: e.response?._data?.response,
			}
		}

		return DEFAULT_SERVER_ERROR;
	}
});

[Edoardo Ranghieri]

This feature will land in v7 stable, and will also be available in next channel shortly, when #93 gets merged.