[BUG] [javascript-flowtyped] Add Error to language primitives

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?

Description

When there is a type named Error in the specification, the generator generates code that does not typecheck.

openapi-generator version

4.3.0

OpenAPI declaration file content or url

openapi: '3.0.0'
info:
  version: 0.0.0
  title: Bug
paths:
  /bug:
    get:
      responses:
        default:
          $ref: '#/components/responses/UnexpectedError'
components:
  responses:
    UnexpectedError:
      description: unexpected error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      properties:
        code:
          type: integer
          format: int32
          example: 500

Command line used for generation

openapi-generator generate -i bug.yaml -g javascript-flowtyped -o bug/

Steps to reproduce

• Generate code with the above command line
• Check the generated code with flow check bug
• You get

Cannot reference type Error [1] from a value position.

     62│  * @class RequiredError
     63│  * @extends {Error}
     64│  */
     65│ export class RequiredError extends Error {
     66│     name:string = "RequiredError"
     67│     constructor(field: string, msg?: string) {
     68│         super(msg);
       :
 [1] 76│ export type Error = {

because JavaScript's built-in Error type conflicts with the generated type alias for the Error record defined in the OpenAPI specification.

Related issues/PRs

I found none.

Suggest a fix

Reject the specification if it contains a type named Error.

Start with the openapi-generator generate -i bug.yaml -g javascript-flowtyped -o bug/ entry point and reproduce the issue using the specification in the report. Run flow check bug and inspect the javascript-flowtyped generation path; done means a schema named Error no longer causes the generated output to fail type checking, or is rejected as specified.