Is there a feature that wishes to use this, but it doesn't exist, or is this request simply for completeness?

Marking as Pri-3 Available unless there are clients that are blocked on, or working around, this feature.

This type is present at https://w3c.github.io/sensors/#the-sensor-error-event-interface which is being implemented in Chromium.

Good to know. I'm slightly unsure how we'll end up implemented this, as it's complicated by isolated worlds.

Specifically, if you give a non-DOMException object, what should the V8 object be when you access it in a different world? Undefined? A proxy/membrane (which we don't implement)? A shallow copy?

Leaving at Pri-3 for now, but probably it becomes Pri-2 if sensor is blocking on it.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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bumping back to available; not clear that much has changed here, but ccing a couple TOK bindings people who may have opinions

IIRC, all used Error types were replaced with DOMException, and we no longer have cases of Error types, and we decided to support only DOMException interface directly.