/** Best-effort error normalization for tgrid transport. */
export function normalizeError(error: unknown): unknown {
  if (error instanceof Error) {
    const normalized: {
      code?: string;
      message: string;
      name: string;
      stack?: string;
    } = {
      name: error.name,
      message: error.message,
      stack: error.stack,
    };
    const code = (error as Error & { code?: unknown }).code;
    if (typeof code === "string") normalized.code = code;
    return normalized;
  }
  if (
    error &&
    typeof error === "object" &&
    "message" in (error as Record<string, unknown>)
  )
    return error;
  return { name: "Error", message: String(error) };
}