Function isInstance

libs/langchain-core/src/messages/base.ts:368–376

(obj: unknown)

  }

  static isInstance(obj: unknown): obj is BaseMessage {
    return (
      typeof obj === "object" &&
      obj !== null &&
      MESSAGE_SYMBOL in obj &&
      (obj as Record<symbol, unknown>)[MESSAGE_SYMBOL] === true &&
      isMessage(obj)
    );
  }

  // this private method is used to update the ID for the runtime
  // value as well as in lc_kwargs for serialisation