[BUG] typescript-fetch api doesn't compile with unique items array in the response body

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

Generated Api for unique item collection on the response body is not compiling because map operation is executed on a Set.

TS2339: Property map does not exist on type Set<Tag>

openapi-generator version

7.25.0

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: uniqueItems test spec
  version: 1.0.0
  description: >-
    Spec used to test arrays with uniqueItems across every OpenAPI location
    and item type (string, integer, number, boolean, object, array, $ref).
paths:
  /unique-request-body:
    post:
      operationId: uniqueRequestBody
      requestBody:
        $ref: '#/components/requestBodies/UniqueArrayRequest'
      responses:
        '200':
          description: OK
components:
  schemas:
    Tag:
      type: object
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
  requestBodies:
    UniqueArrayRequest:
      description: Request body that is an array with uniqueItems
      required: true
      content:
        application/json:
          schema:
            type: array
            uniqueItems: true
            items:
              $ref: '#/components/schemas/Tag'

Generation Details

Default generation, without Set to Array type mapping.

Steps to reproduce

Generate typescript-fetch client for the provided

Related issues/PRs

N/A

Suggest a fix

I will fix it myself.

Start by generating a typescript-fetch client from the provided OpenAPI declaration using openapi-generator 7.25.0 or the latest master, then inspect the generated unique-request-body handling where map is called on a Set. Done means the generated client compiles without the TS2339 error for the supplied uniqueItems request body.