Option to provide non-wrapped version of error (onError).

[beganovich]

Describe the feature

Hi,

I've been implementing a custom error handler using onError and it works fine, except for one part. Since every error is wrapped using H3Error class, code like this isn't possible:

class CustomError extends Error {}

const app = createApp({
  onError(error, event) {
    if (error instanceof CustomError) {
      // ..
    }
  },
});

This would be super useful in case of custom validation error handling, for example, ZodError class. The key part missing is instanceof since each error is wrapped using H3 (https://github.com/unjs/h3/blob/main/src/error.ts#L55).

I was wondering, is there interest in providing an option to AppOptions for "vanilla" error classes?

Additional information

• Would you be willing to help implement this feature?

[pi0]

Hi and thanks for the suggestion. I think it is really valid cause to have the need of accessing the original error object. As a more generic fix, i think we can make original error accessible from wrapped object.

[pi0]

With #479 in next release you can access original error simply using error.cause