Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

Compare these files in the samples directory:

https://github.com/OpenAPITools/openapi-generator/blob/master/samples/client/petstore/typescript-fetch/builds/default/apis/PetApi.ts

vs

https://github.com/OpenAPITools/openapi-generator/blob/master/samples/client/petstore/typescript-fetch/builds/with-interfaces/apis/PetApi.ts

openapi-generator version

Master branch

Suggest a fix

Could not find reference to withInterfaces parameter in the mustache templates, and no difference in the generated api.

Option should be removed from documentation or re-implemented for typescript-fetch

https://openapi-generator.tech/docs/generators/typescript-fetch