Definitions with additional props transformed into invalid models

[paveltobias]

Example Swagger

swagger: "2.0"

info:
  title: Example
  version: 0.0.1

host: ex.amp.le
basePath: /ex/amp/le/

schemes:
  - https

consumes:
  - application/json

produces:
  - application/json

paths:
  /dictionaries:
    get:
      responses:
        200:
          description: OK
          schema:
            $ref: "#/definitions/Dictionary"

definitions:
  Dictionary:
    type: object
    additionalProperties:
      $ref: "#/definitions/DictionaryItem"

  DictionaryItem:
    type: object
    properties:
      value:
        type: string
    required:
      - value

Expected Result (Excerpt)

export interface Dictionary {
  [key: string]: DictionaryItem;
}

Actual Result (Excerpt)

export interface Dictionary {
}