[BUG] [typescript-fetch] JSON Strings include quotes in response

Created by: vkhougaz-sonatype

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

I have an API that returns JSON encoded strings, similar to

"API Result Information"

INCLUDING the quotes.

openapi-generator version

Usually 5.1.0, also reproduced on

OpenAPI declaration file content or url

https://github.com/vkhougaz-sonatype/openapi-bug/blob/master/swagger.yaml

swagger: "2.0"
info:
  version: v1
  title: Our API
  description: The REST API for interacting with Our API
host: localhost:1234
schemes:
  - http
paths:
  "/api/job/{jobid}/status":
    get:
      summary: getJobStatus
      description: Get the current status for a job.
      operationId: getJobStatus
      produces:
        - application/json;charset=utf-8
      parameters:
        - required: true
          in: path
          name: jobid
          type: string
      responses:
        "200":
          schema:
            $ref: "#/definitions/JobStatus"
          description: ""
        "404":
          description: "`jobid` not found"
definitions:
  JobStatus:
    type: string

Generation Details

docker run --rm -v "${PWD}:/local" openapitools/openapi-generator-cli generate -i /local/swagger.yaml -g typescript-fetch -o /local/out

Steps to reproduce

Install demo repo

git clone https://github.com/vkhougaz-sonatype/openapi-bug
cd openapi-bug
# node >v10
npm install
./build-and-serve.sh

open browser to http://localhost:1234
See status

Got `"ok"` expected `ok`

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/3709 https://github.com/OpenAPITools/openapi-generator/pull/4028

Suggest a fix

Update api code to not use simple response for "string" type?