[@azure/openai-assistants] Cannot set files on individual thread/message

[howlowck]

• Package Name: @azure/openai-assistants
• Package Version: 1.0.0-beta.5
• Operating system: WSL
• nodejs
  • version: v20.10.0
• browser
  • name/version: NA
• typescript
  • version: 5.2.2
• Is the bug related to documentation in
  • README.md
  • source code documentation
  • SDK API docs on https://docs.microsoft.com

Describe the bug

I would like to set file_ids on the message level when creating a thread (when the assistant is already created).

OpenAI API allows us to set file_ids on the message level. In the python SDK, we are also allowed to set the file ids on the message level.

It looks like there is an unused type ThreadInitializationMessage in the source code already, that would allow for fileIds. However the AssistantThreadCreationOptions type has the messages hard-coded.

To Reproduce
Steps to reproduce the behavior:

1. Create an assistant
2. Upload files
3. Try to add the following lines:

const threadRun = await assistantsClient.createThreadAndRun({
    assistantId: assistant.id,
    thread: {
      messages: [
        {
          role: "user",
          content: question,
          fileIds: fileIds,
        },
      ],
    },
  });

fileIds will give a type error.

Expected behavior
fileIds property should be allowed.

Screenshots