[BUG][typescript-axios] Unnecessary imports occurs when using nested model in allOf

Created by: tanmen

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?
• [Optional] Bounty to sponsor the fix (example)

Description

If allOf is used, it tries to import a nested model that is not used. import must be used or deleted.

target schemas

    Response:
      type: string
      example: success
      enum:
        - success
        - error
    Box:
      type: object
      properties:
        id:
          type: number
          example: 1
        name:
          type: string
          example: inbox
        box:
          $ref: '#/components/schemas/BoxInBox'
    BoxInBox:
      type: object
      properties:
        id:
          type: number
          example: 1
        name:
          type: string
          example: inbox
    BoxesResponse:
      allOf:
        - $ref: '#/components/schemas/Response'
        - $ref: '#/components/schemas/Box'

generated typescript file

import { Box } from './box';
import { BoxInBox } from './box-in-box';
import { Response } from './response';

/**
 * 
 * @export
 * @interface BoxesResponse
 */
export interface BoxesResponse {
    /**
     * 
     * @type {string}
     * @memberof BoxesResponse
     */
    status: BoxesResponseStatusEnum;
    /**
     * 
     * @type {number}
     * @memberof BoxesResponse
     */
    id?: number;
    /**
     * 
     * @type {string}
     * @memberof BoxesResponse
     */
    name?: string;
    /**
     * 
     * @type {BoxInBox}
     * @memberof BoxesResponse
     */
    box?: BoxInBox;
}

/**
    * @export
    * @enum {string}
    */
export enum BoxesResponseStatusEnum {
    Success = 'success',
    Error = 'error'
}

expected

import { Box } from './box';
import { Response } from './response';

/**
 * 
 * @export
 * @interface BoxesResponse
 */
export type BoxesResponse = Response & Box;

openapi-generator version

4.2.2

OpenAPI declaration file content or url

openapi: 3.0.2
info:
  title: My application
  version: 1.0.0
  description: My application
tags:
  - name: Box
paths:
  /boxes:
    get:
      summary: Box list
      description: Box list
      operationId: showBoxes
      tags:
        - Box
      responses:
        200:
          description: Box list
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BoxesResponse'
components:
  schemas:
    Response:
      type: string
      example: success
      enum:
        - success
        - error
    Box:
      type: object
      properties:
        id:
          type: number
          example: 1
        name:
          type: string
          example: inbox
        box:
          $ref: '#/components/schemas/BoxInBox'
    BoxInBox:
      type: object
      properties:
        id:
          type: number
          example: 1
        name:
          type: string
          example: inbox
    BoxesResponse:
      allOf:
        - $ref: '#/components/schemas/Response'
        - $ref: '#/components/schemas/Box'

Command line used for generation

openapi-generator generate -i openapi.yml -g typescript-axios -o apis -p withSeparateModelsAndApi=true --api-package apis --model-package models

Steps to reproduce

N/A

Related issues/PRs

#4629 (closed)

Suggest a fix

#4805