Description

Hello! 🌞

I'm wondering why the UIMessageChunk for type 'file' does not include 'filename' (see here) while the FileUIPart (see here) does? 😊

I'm creating a tool that creates a file and thus wanted to write the created file to the stream, including a filename, which was not possible:

... (
  writer: UIMessageStreamWriter<CustomUIMessage>
): {
  writer.write({
    type: 'file',
    url,
    mediaType,
    // filename: '' // not supported in type
  })
}

What's the reason for the UIMessageChunk not including filename? 😊 Would it be possible to add? 🙏

AI SDK Version

• ai: 5.0.72,
• @ai-sdk/react: 2.0.75,
• @ai-sdk/azure: 2.0.53

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