[typescript-angular] property named '*' causes trouble

Description

For some reason swashbuckle is creating a swagger doc with '*' property names (seems to have trouble with "Dictionary"). I was generating a typescript-angular client from that swagger-doc using editor.swagger.io and noticed that properties with the name '*' were not getting output.
It generated:

export interface BrokenThingProperties {
    ?: any;
}

This resulted in " error TS1131: Property or signature expected."

Swagger-codegen version

I assume editor.swagger.io is using a fairly recent version.

Swagger declaration file content or url

swagger: '2.0'
info:
  version: trunk
  title: API
basePath: /
paths:
  /path:
    post:
      tags:
        - graph
      summary: Invokes a command and returns the response.
      operationId: ApiV1GraphPost
      consumes:
        - application/json
        - text/json
        - application/json-patch+json
      produces: []
      parameters:
        - name: query
          in: body
          required: false
          schema:
            $ref: '#/definitions/brokenThing'
      responses:
        '200':
          description: Success
definitions:
  brokenThing:
    description: this thing results in broken typescript
    required:
      - query
    type: object
    properties:
      property1:
        type: object
        properties:
          '*':
            type: number
            example: '3'
      '*':
        example: 'a'
        type: string

Command line used for generation

http://editor.swagger.io

Steps to reproduce

Pasted the above YAML in editor.swagger.io and then generated typescript-angular client.

Related issues/PRs

Suggest a fix/enhancement

I'm not sure what i'm really expecting, javascript property names can be super weird. It could put out "*" as the name.

export interface BrokenThingProperties {
    "*"?: any;
}

At least it would compile... if that is even desirable in this case. Maybe '*' shouldn't be allowed as a property name? I'm pretty sure this won't play nice in many of the other languages either.

Start with the TypeScript-Angular generator and the supplied Swagger definition, especially the object properties named '*'. Generate the client using the reproduction document and verify that the resulting BrokenThingProperties interface uses valid TypeScript property syntax and compiles without TS1131.