OpenAPITools / OpenAPITools/openapi-generator

[REQ] Infer const type during 3.1 normalization

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Enhancement: Feature
Dominant language
Java
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Description

Is your feature request related to a problem? Please describe.

Some 3.1 schemas represent enumerations as oneOf consts without type. Current normalization doesn't convert such schemas to enums.

Describe the solution you'd like

During normalization, if a schema with const has no type, it should be inferred from the const value.

Example

  # Input (3.1 schema)
  oneOf:
    - const: "foo"
    - const: "bar"

  # Expected normalized output
  type: string
  enum:
    - foo
    - bar

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No file or test is named in the issue. Locate the OpenAPI 3.1 normalization entry point and existing normalization tests, then trace how oneOf const schemas are handled. Done means a const without type is inferred from its value and the example normalizes to a string enum.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, openapi
Domain
api
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
55/100

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