/**
 * Typed protocol failures — callers branch on `code` instead of parsing a
 * message string. Domain failures travel in the reply value, never here.
 * @public
 */
export type MessageBusErrorCode =
  | "NO_RESPONDER"
  | "TIMEOUT"
  | "ABORTED"
  | "HANDLER_THREW"
  | "PROTOCOL_MISMATCH";

/** @public */
export class MessageBusError extends Error {
  readonly code: MessageBusErrorCode;

  constructor(
    code: MessageBusErrorCode,
    message?: string,
    options?: { cause?: unknown },
  ) {
    super(message ?? code, options);
    this.name = "MessageBusError";
    this.code = code;
  }
}