Function on

packages/core/src/debug/debugController.ts:714–728

(event: DebugEventType, handler: DebugRecordHandler | DebugErrorHandler)

  }

  function on(event: DebugEventType, handler: DebugRecordHandler | DebugErrorHandler): () => void {
    if (event === "record") {
      const h = handler as DebugRecordHandler;
      recordHandlers.add(h);
      return () => {
        recordHandlers.delete(h);
      };
    }

    if (event === "error") {
      return errorAggregator.on("error", handler as DebugErrorHandler);
    }

    return () => {};
  }

  return {
    enable,