[BUG][TYPESCRIPT] type array with uniqueItems generates import of Set

[janKollars]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• 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

If a property is documented as an array of unique items the generator sets the property's type in the TypeScript file to a Set of the item type e.g. Set<string>. The problem is that Set is imported from a resource which does not exist.

import { Set } from './Set';

This line should not be generated.

openapi-generator version

5.2.1

OpenAPI declaration file content or url

openapi: 3.0.1
info:
  title: OpenAPI generator Set Bug
  version: v0
servers:
  - url: http://localhost:8081
    description: Generated server url
paths:
  /test:
    get:
      responses:
        '200':
          description: OK
          content:
            TestObject:
              schema:
                $ref: '#/components/schemas/TestObject'
components:
  schemas:
    TestObject:
      type: object
      properties:
        setOfStrings:
          uniqueItems: true
          type: array
          items:
            type: string

Generation Details

No settings required.

openapi-generator generate -g typescript -i testfile-above.yaml -o wherever

Steps to reproduce

1. create the declaration file with the content from above locally
2. use the generator
3. inspect the file TestObject.ts

Actual result

import { Set } from './Set';
import { HttpFile } from '../http/http';

export class TestObject {
    'setOfStrings'?: Set<string>;
    ...
}

Expected result

import { HttpFile } from '../http/http';

export class TestObject {
    'setOfStrings'?: Set<string>;
    ...
}

Related issues/PRs

Suggest a fix