[BUG] typescript-axios generator works bad for formdata array

openapi-generator version

5.1.1

OpenAPI declaration file content or url

 put:
      summary: "Update a new painting"
      operationId: "updatePainting"
      tags:
        - "Paintings"
      consumes:
        - "multipart/form-data"
      parameters:
        - in: "formData"
          name: "image"
          type: "file"
        - in: "formData"
          name: "genres"
          type: **"array"**
          items:
            type: "string"
          required: true

Generation Details

openapi-generator-cli generate -g typescript-axios -i ../server/swagger.yaml -o src/api

Steps to reproduce

Specification example results in:

if (genres) {
                localVarFormParams.append(genres.join(COLLECTION_FORMATS.csv));
}

and the error in browser displayed: TypeError: Failed to execute 'append' on 'FormData': 2 arguments required, but only 1 present.

Suggest a fix

Expected result:

if (genres) {
                localVarFormParams.append('genres', genres.join(COLLECTION_FORMATS.csv));
}

Start with the typescript-axios generator and reproduce the issue using the provided OpenAPI formData declaration and generation command. Trace the generated FormData handling for the genres array, then verify the generated call includes the parameter name and passes the reproduction without the browser append error.