[typescript] Prevent nested models/interfaces

This issue is related to this question on stack-overflow

Input JSON

I have a huge JSON. This is an excerpt of it. (I can't past it all because it's for internal use only and because it's 16k lines).

{
  "base.get.v1.Input": {
    "properties": {
      "request": {
        "$ref": "#/components/schemas/base.get.v1.Input.Request"
      },
      "id": {
        "maxLength": 128,
        "type": "string"
      }
    },
    "required": ["id"],
    "type": "object"
  }
}

Output interface

Using OpenApi-generator-cli-3.0.0.jar i get the following typescript file (relative to the part of JSON showed before):

import { BaseGetV1InputRequest } from './baseGetV1InputRequest';


export interface BaseGetV1Input {
    request?: BaseGetV1InputRequest;
    trid: string;
}

Desired result

Is there a way to have the request object (and subsequent objects) be expanded (solver or exploded, whatever term you prefer). I would like the final interface to be like that:

import { BaseGetV1InputRequest } from './baseGetV1InputRequest';


export interface BaseGetV1Input {
  request?: {
    entity?: {
      code?: 0,
      id?: string
    },
    procedure?: string,
    search?: {
      type?: "starts" | "contains",
      value?: string
    }
  },
  trid: string
}

Tested solutions that don't work

I have tried to solve the $ref myself using json-schema-ref-parser but i think the codegen creates a sub-model when it finds properties inside of the input JSON. I have to admit i didn't read the docs when i first started. I assumed a new interface was created with every $ref.

I have also tried w/ and w/o mustache templates (that someone else got me). But the output didn't change.

I have also tried with the latest snapshot of the codegen as suggested by William Cheng in one of the comments. The problem isn't with the version but with a feature that I might not know about or that's not even possible.

I'm fairly new to OpenAPI, hope you can help me.

Reproduce the request with the supplied OpenAPI schema using openapi-generator-cli and the TypeScript generator. Compare the generated nested model file with the desired inline interface, then inspect the generator entry point and any mustache templates involved. Done means nested $ref models are expanded in the generated TypeScript interface without unwanted sub-model files.