swc-project/swc · error

failed to handle with unknown panic message

Error message

failed to handle with unknown panic message

What it means

Error "failed to handle with unknown panic message" thrown in swc-project/swc.

Source

Thrown at bindings/binding_core_node/src/util.rs:59

                swc_core::base::HandlerOpts {
                    skip_filename,
                    ..Default::default()
                },
                |handler| {
                    //
                    let result = catch_unwind(AssertUnwindSafe(|| op(handler)));

                    let p = match result {
                        Ok(v) => return v,
                        Err(v) => v,
                    };

                    if let Some(s) = p.downcast_ref::<String>() {
                        Err(anyhow!("failed to handle: {s}"))
                    } else if let Some(s) = p.downcast_ref::<&str>() {
                        Err(anyhow!("failed to handle: {s}"))
                    } else {
                        Err(anyhow!("failed to handle with unknown panic message"))
                    }
                },
            )
        })
        .map_err(|e| e.to_pretty_error())
}

// This was originally under swc_nodejs_common, but this is not a public
// interface for the custom binary - they should choose own trace initialization
// instead. Will keep as hidden for now until there's proper usecase.

/// Deprecated no-op kept for compatibility with existing binding entrypoints.
pub fn init_default_trace_subscriber() {}

View on GitHub (pinned to d7d7434666)

When it happens

Trigger: Thrown at bindings/binding_core_node/src/util.rs:59 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of swc-project/swc@d7d7434666 (2026-08-16). Data as JSON: /api/errors/88524d76f16936d5. Report an issue: GitHub.