Incorrect tuple type inference for array items in response content

[oltodo]

openapi-typescript version

7.12.0

Node.js version

22.x.x

OS + version

13.1

Description

Hi 👋

I’m running into an issue with type inference when using openapi-typescript together with openapi-fetch.

It seems that tuple types defined in the OpenAPI schema are widened to regular arrays in the generated types.

Reproduction

import createClient from "openapi-fetch";

interface operations {
  foo: {
    parameters: {
      query?: never;
      header?: never;
      path?: never;
      cookie?: never;
    };
    requestBody?: never;
    responses: {
      200: {
        headers: {
          [name: string]: unknown;
        };
        content: {
          "application/json": {
            data: {
              id: string | number;
              content: [{ foo: "" }];
            }[];
          };
        };
      };
      400: {
        headers: {
          [name: string]: unknown;
        };
        content?: never;
      };
      401: {
        headers: {
          [name: string]: unknown;
        };
        content?: never;
      };
      403: {
        headers: {
          [name: string]: unknown;
        };
        content?: never;
      };
      404: {
        headers: {
          [name: string]: unknown;
        };
        content?: never;
      };
      500: {
        headers: {
          [name: string]: unknown;
        };
        content?: never;
      };
    };
  };
}

interface paths {
  "/foo": {
    parameters: {
      query?: never;
      header?: never;
      path?: never;
      cookie?: never;
    };
    get: operations["foo"];
    put?: never;
    post: never;
    delete?: never;
    options?: never;
    head?: never;
    patch?: never;
    trace?: never;
  };
}

const client = createClient<paths>({ baseUrl: "" });

async function main() {
  const { data } = await client.GET("/foo");
  //      ^ `content` is typed as `{ foo: "" }[]`
}

Expected result

content should be typed as [{ foo: "" }]

Required

• My OpenAPI schema is valid and passes the Redocly validator (npx @redocly/cli@latest lint)

Extra

• I’m willing to open a PR (see CONTRIBUTING.md)

[PaulKiddle]

I believe this is a duplicate of #2632

[oltodo]

Indeed, closing it.
Thanks @PaulKiddle