Event carrying an uncaught Worker error. Trusted Worker error events dispatched by JSplitter are non-cancelable because handler presence itself determines whether the error is handled.

Source column associated with the error, or 0 when unavailable.

Original thrown JavaScript value when it can be exposed to the receiving realm.

Script filename associated with the error when one is available. File-backed Workers report the basename, matching panel-script diagnostics.

One-based source line associated with the error, or 0 when unavailable.

Human-readable error message reported by the failing Worker script or callback.