[typescript] allow $ in var name

Created by: jmini

Description

In the OpenAPI Specification there is no limitation on the name of the properties in an object schema. Some clean-up logic is made to prevent illegal member name.

The problem is that lorem, $_lorem are all mapped to a member field called lorem

CC: @kayhuba

openapi-generator version

3.1.2

OpenAPI declaration file content or url

openapi: 3.0.1
info:
  title: A dummy title
  version: 1.0.0

paths:
  /my/endpoint:
    get:
      summary: Returns an object 
      operationId: getMyObject
      responses:
        '200':
          description: Ok
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Dummy" 
components:
  schemas:
    Dummy:
      type: object
      properties:
        'lorem':
          type: string
        ‘$_lorem':
          type: string

Command line used for generation

CLI to use the typescript-node generator.

Steps to reproduce

Related issues/PRs

This was fixed by @jmini for the java client and server with commit e7410d4c

Suggest a fix/enhancement

Support $ in variable name for typescript.