OpenAPITools / OpenAPITools/openapi-generator

[BUG][typescript-fetch] oneOf with arrays generate Typescript error

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Issue: Bug
Dominant language
Java
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Description

Description

It seems that a change from https://github.com/OpenAPITools/openapi-generator/pull/21464 broke the oneOf sample. Typescript now throw an error because of the last condition of the TestArrayResponseToJSONTyped method:
TS2339: Property every does not exist on type never

openapi-generator version

7.15.0

OpenAPI declaration file content or url

https://github.com/OpenAPITools/openapi-generator/blob/master/samples/client/petstore/typescript-fetch/builds/oneOf/models/TestArrayResponse.ts#L84

Generation Details
Steps to reproduce

Try compiling the oneOf sample with Typescript

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

The failing sample is samples/client/petstore/typescript-fetch/builds/oneOf/models/TestArrayResponse.ts, in TestArrayResponseToJSONTyped. Start by compiling the oneOf sample with TypeScript and inspect the final condition referenced in the issue. Done means the sample compiles without TS2339.

Written by the indexing model from the issue text.

Assessment

Tech stack
openapi, typescript
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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