Make existing thread messages compatible with append method

[igo]

Would be great if messages are compatible with all methods that deal with messages. For example if I want to restart conversation with the first message:

  const firstUserMsg = runtime.thread.getState().messages.find(m => m.role === 'user');
  runtime.switchToNewThread();
  runtime.thread.append({
    role: 'system',
    content: [{ type: 'text', text: 'new system message' }],
  });
  if (firstUserMsg) {
    runtime.thread.append(firstUserMsg);
                          ^^^^^^^^^^^^
  }

Argument of type 'BaseThreadMessage & MessageCommonProps & { role: "user"; content: ThreadUserContentPart[]; attachments: readonly CompleteAttachment[]; }' is not assignable to parameter of type 'CreateAppendMessage'.
  Type 'BaseThreadMessage & MessageCommonProps & { role: "user"; content: ThreadUserContentPart[]; attachments: readonly CompleteAttachment[]; }' is not assignable to type '{ parentId?: string | null | undefined; role?: "system" | "user" | "assistant" | undefined; content: [TextContentPart] | CoreUserContentPart[] | CoreAssistantContentPart[]; attachments?: readonly CompleteAttachment[] | undefined; }'.
    Types of property 'content' are incompatible.
      Type 'ThreadUserContentPart[]' is not assignable to type '[TextContentPart] | CoreUserContentPart[] | CoreAssistantContentPart[]'.
        Type 'ThreadUserContentPart[]' is not assignable to type 'CoreUserContentPart[] | CoreAssistantContentPart[]'.
          Type 'ThreadUserContentPart[]' is not assignable to type 'CoreUserContentPart[]'.
            Type 'ThreadUserContentPart' is not assignable to type 'CoreUserContentPart'.
              Type 'UIContentPart' is not assignable to type 'CoreUserContentPart'.
                Property 'audio' is missing in type 'UIContentPart' but required in type 'Unstable_AudioContentPart'.ts(2345)
AssistantTypes.d.ts(14, 5): 'audio' is declared here.

[Yonom]

Thanks for reporting this! its mianly a typescript bug, you can force cast it via

runtime.thread.append(firstUserMsg as AppendMessage);

I'll fix this soon on the library's side as well