[JS] Missing `isUnexpected` Overload

[minhanh-phan]

The generation isUnexpected method is missing multiple overloads. There are 5 different audio formats json, verbose_json, vrt, stt, text for translation and transcription task, but only 1 format json` is generated.

The generated isUnexpected method for audio tasks is here.

export function isUnexpected(
  response:
    | GetAudioTranscriptionSimpleJson200Response
    | GetAudioTranscriptionSimpleJsonDefaultResponse
): response is GetAudioTranscriptionSimpleJsonDefaultResponse;
export function isUnexpected(
  response:
    | GetAudioTranslationSimpleJson200Response
    | GetAudioTranslationSimpleJsonDefaultResponse
): response is GetAudioTranslationSimpleJsonDefaultResponse;

The TypeSpec definition of these 5 models for translation task is here

Expected: An overload for each of the interface

Reproduce:

• Use the latest commit fb4f558b15075826656a3061d332d1a198352dd4 to regenerate for OpenAI package

[MaryGao]

Thanks for reporting this! I think we need to improve our isUnexpected to accept all overloading types.

[minhanh-phan]

Hi @MaryGao, I want to check in on the progress of this issue. This is a blocker for OpenAI and would love to have a resolution soon! Thank you.

[MaryGao]

@minhanh-phan May I know if there is any build failure introduced by missing types? Jose is working on the fix and I'd like to know how to detect these issues in our testing.

[minhanh-phan]

@MaryGao Yes, we were trying to generate with the latest commit 8f13627230772d90c8db09636e88b9a26dc73044 from this PR. The sources folder cannot be built because there are error types from missing the isUnexpected overload in the operations.ts file.