[BUG] [typescript-node] Generating only models generates invalid TS

Created by: sarumont

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
What's the version of OpenAPI Generator used?
Have you search for related issues/PRs?
What's the actual output vs expected output?

Description

When providing --global-property models to generate only models, the resultant TypeScript references ../api for importing RequestFile.

openapi-generator version

4.3.1

Not a regression that I know of.

OpenAPI declaration file content or url

Any valid OpenAPI file containing models will reproduce this.

openapi: 3.0.2
info:
  version: 0.3.0
  description: null
  title: '@devsupply/core-types-typedefs'
paths:
  /foo:
    get:
      tags:
        - foo
      operationId: getFoo
      responses:
        "204":
          description: Foo
components:
  schemas:
    CloudProvider:
      type: string
      enum:
        - AWS
        - AZURE
        - GOOGLE
      x-enum-descriptions:
        - Amazon AWS
        - Microsoft Azure
        - Google Cloud Platform

Generation Details

npx openapi-generator generate 
    -g typescript-node 
    --global-property models 
    -i ./example.yml -o gen/

Steps to reproduce

Generate code as above. Attempt to build via TypeScript:

npx tsc gen/model/cloudProvider.ts

Results in:

13 import { RequestFile } from '../api';
                               ~~~~~~~~


Found 1 error.

Suggest a fix

Suggest moving the RequestFile definition into models.ts and also generating this file when --global-property models is provided. Will submit a PR with this fix...

Related Issue: #7040 (closed) (it should be noted that moving the RequestFile definition will not work until #7040 (closed) is addressed, as the validators import things from request)