[typescript-angular] File arrays do not use FormData

Description

When a formData file parameter is an array, the generated code does not properly trigger the use of FormData. The generated code works properly be manually changing the below line in the generated service method:

let useForm = false;

to

let useForm = canConsumeForm;

Swagger declaration file content or url

post:
      operationId: UploadFiles
      tags:
        - Documents
      summary: Creates a new document with a single revision.
      consumes:
        - multipart/form-data
      parameters:
        - name: files
          in: formData
          type: array
          items:
            type: file
      responses:
        '201':
          description: Document created successfully
          schema:
            $ref: '#/definitions/DocumentSummaryResponse'
      produces:
        - application/json

Suggest a fix/enhancement

In addition to checking if the parameter is of type file, the code gen logic should also check if the items.type parameter is of type file. If so, set the isFile flag to true.

Start at the TypeScript Angular generator logic that determines whether a formData parameter is a file, using the generated service method and the provided Swagger declaration as the reproduction. Check the existing file-parameter condition against array items.type; done when an array of files causes useForm to use canConsumeForm without manual edits.