Error's `cause` not respected (for non-Error causes)

[jeengbe]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/browser

SDK Version

7.88.0

Framework Version

n/a

Link to Sentry event

https://prisjakt-ab.sentry.io/issues/4738454694/events/latest/?project=4506415694348288

SDK Setup

Sentry.init({
  // ...
  integrations: [
    new Sentry.Integrations.Http(),
    new Sentry.Integrations.FunctionToString(),
    new Sentry.Integrations.ContextLines(),
    new Sentry.Integrations.LocalVariables(),
    new Sentry.Integrations.LinkedErrors(),
    new Sentry.Integrations.RequestData({
      include: {
        user: false,
        ip: true,
        cookies: false,
        data: false,
        headers: false,
        query_string: false,
        url: false,
      },
    }),
  ],
  // ...
});

Sentry.withScope((scope) => {
  scope.setSDKProcessingMetadata({ request: ctx.request });
  Sentry.captureException(error);
});

Steps to Reproduce

1. Do API request:

try {
  const res = await doFetch();

  if (res.error) {
    throw new Error("Request failed", {
      cause: res
    });
  }

2. Catch error and log it

} catch (err) {
  Sentry.withScope((scope) => {
    scope.setSDKProcessingMetadata({ request: ctx.request });
    Sentry.captureException(err);
  });
}

This adds the failed API response as cause on the error object. Yet on the linked issue in Sentry, there is no reference to that error cause.

Expected Result

The cause should somehow show in Sentry. I saw it do that for Error-causes. I saw some other GH issue thread that had something to do with a React boundary, but that was fixed and closed, so likely not applicable (also I can't find the link any more)

Actual Result

The cause doesn't show on the Sentry issue.

[lforst]

Hi, linking errors based on the cause property with the LinkedErrors integration is only supported if the value behind cause is an Error. What you likely need and want is the ExtraErrorData integration. Let me know if this helps!

[jeengbe]

Ah so when I see an issue in Sentry with another linked issue, that's a linked Sentry issue that's linked from the cause?

[lforst]

Ah so when I see an issue in Sentry with another linked issue, that's a linked Sentry issue that's linked from the cause?

I don't think it's an "issue" but definitely another error object on the cause property of the captured error.

[jeengbe]

Is that something you would consider supporting? Structured non-Error data is explicitly allowed according to MDN https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause#providing_structured_data_as_the_error_cause

[lforst]

We definitely could! Putting on backlog.