[BUG][Typescript-jquery] optional file upload does not compile - passing File interface to formParams.append()

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• 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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The api*Api.ts code for optinal file upload has the following two flaws and does not compile:

public *Post(..., file?: File, ...).. {
  let reqHasFile = false;
    // a few lines later...
  reqHasFile = true; // WHY??? It should have checked and put the declaration in a if statement
  formParams.append("file", file); // <- TS(2769) No overload matches this call. (name: string, value: string | Blob): void, we pass a File interface
  if (!reqHasFile) {
     headerParams['Content-Type'] = 'application/x-www-form-urlencoded';
  }
}

openapi-generator version

openapi-generator-cli 7.14.0-SNAPSHOT
commit : 4cffd32
built : -999999999-01-01T00:00:00+18:00
source : https://github.com/openapitools/openapi-generator
docs : https://openapi-generator.tech/

Run via docker "docker run --rm -v .:/local openapitools/openapi-generator-cli"

OpenAPI declaration file content or url

https://gist.github.com/dgasparri/c5e343f3e7d225284c087ba304678e44

Generation Details

docker run --rm -v .:/local openapitools/openapi-generator-cli generate -i /local/openapi-rust.current.yml -g typescript-jquery -o /local/out/typescript-jquery/ --additional-properties=importFileExtension='.js'

Steps to reproduce

The bug is in the compiled typescript+jquery code

Related issues/PRs

I searched for file, upload, label Client: typescript . I didn't find any other bug that could be related to this one.

Suggest a fix

Generate the typescript-jquery client with the Docker command in the issue and inspect the generated api*Api.ts code for the optional file upload. Compare the output with the reported reqHasFile logic and formParams.append call, then compile the generated TypeScript to verify that the upload and content-type handling are corrected.