[Bug]: OpenAPI to TypeSpec conversion of arrays of inline enums lead to invalid TypeSpec

[baywet]

Describe the bug

Using the conversion tool, inline enums for an array are not converted properly. I'd expected an enum definition, either inline definition, or as a separate type.

Reproduction

The following component schema

    ChatCompletionModalities:
      type: array
      items:
        type: string
        enum:
          - text
          - audio

leads to the following TypeSpec

union ChatCompletionModalities {
null,
}

Which missing the enum values

tool version 1.3.0

Checklist

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• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[willmtemple]

@baywet Could you share a full minimal OpenAPI3 document that has this issue? I tried with the following OAS and got the subsequent result, which includes a correct definition of a model that is ("text" | "audio")[] so I'm unable to reproduce this on my end:

openapi: 3.0.0
info:
  title: Test Service
  version: 1.0.0
paths: {}
components:
  schemas:
    ChatCompletionModalities:
      type: array
      items:
        type: string
        enum:
          - text
          - audio

TSP:

import "@typespec/http";
import "@typespec/openapi";
import "@typespec/openapi3";

using Http;
using OpenAPI;

@service(#{ title: "Test Service" })
@info(#{ version: "1.0.0" })
namespace TestService;

model ChatCompletionModalities is ("text" | "audio")[];

[willmtemple]

Is the input schema nullable?

openapi: 3.0.0
info:
  title: Test Service
  version: 1.0.0
paths: {}
components:
  schemas:
    ChatCompletionModalities:
      type: array
      nullable: true
      items:
        type: string
        enum:
          - text
          - audio

With this I see the incorrect conversion you're describing.

[baywet]

@willmtemple yes it is! Let me know if you have any additional comments or questions.