message: One more compile error
diff: @@ -36,7 +36,7 @@ export abstract class AbstractMessageWriter {
  this.closeEmitter.dispose();
  }
  - public get onError(): Event<[Error, Message, number]> {
  + public get onError(): Event<[Error, Message | undefined, number | undefined]> {
  return this.errorEmitter.event;
  }
  