[BUG] NestJS - withInterfaces flag being ignored

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

My understanding of the NestJS OpenAPI Generator docs is that by not including the withInterfaces flag, I should expect models to instead be generated as classes.

Removing or setting this flag to false continues to output interfaces in typescript.

openapi-generator version

7.2

OpenAPI declaration file content or url

https://openapi-generator.tech/docs/generators/typescript-nestjs/#:~:text=false-,withInterfaces,-Setting%20this%20property

Generation Details

Language set to typescript-nestjs (by default this should set withInterfaces to false)

Steps to reproduce

Run npx @openapitools/openapi-generator-cli generate -i <location-of-openapi-spec> -g typescript-nestjs -o <your-output-dir>

Example OpenAPI spec

{
  "openapi": "3.0.0",
  "info": {
    "title": "Dummy API",
    "description": "Dummy",
    "version": "0"
  },
  "paths": {},
  "components": {
    "schemas": {
      "DummyClass": {
        "type": "object",
        "properties": {
          "propertyOne": {
            "type": "string"
          },
          "propertyTwo": {
            "type": "string",
            "format": "uuid"
          }
        },
        "required": ["propertyOne", "propertyTwo"]
      }
    }
  }
}

I would expect the file dummyClass.ts to have a class within it, but instead it has an interface.

I am aware that the nestjs generator is considered experimental, but I had thought I'd seen this working previously, though I can't confirm.

Start with the typescript-nestjs generator's handling of the withInterfaces option and reproduce the issue using the supplied minimal OpenAPI spec and npx command. Inspect the generated dummyClass.ts when the flag is omitted or false; done means it contains a class rather than an interface.