typescript-fetch generated code BaseAPI class doesn't compile

Description

The generated BaseAPI has a non-nullable field Configuration, but it is conditionally assigned in the constructor, resulting in a TS2564 Property 'configuration' has no initializer and is not definitely assigned in the constructor.

Also, in the RequiredError below, the value name has the same issue. It seems to use a semicolon instead of an = symbol

Swagger-codegen version

2.3.1 using version 1.0.44 parser (due to the bundled parser not following refs correctly as has been detailed on another issue)

Swagger declaration file content or url

Any yaml produces it, but here's an abridged version for referenced
If you post the code inline, please wrap it with

swagger: "2.0"
info:
  description: API for VK
  version: "1.0.0"
  title: Blah
tags:
  - name: Miscellaneous
    description: A collection of endpoints for miscellaneous technical tasks

paths:


  '/actuator/health':
    get:
      tags:
        - Miscellaneous
      produces:
        - application/json
      responses:
        200:
          description: Service is health
        503:
          description: Service is unavailable

schemes:
  - http

Command line used for generation

maven plugin

Steps to reproduce

maven install, then try and use a typescript compiler or see the generated output

Related issues/PRs

Nope

Suggest a fix/enhancement

Within the following file: https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/main/resources/typescript-fetch/api.mustache,

Either make configuration nullable , or provide a default one.
Change the colon to an equals in RequiredError.

Start with modules/swagger-codegen/src/main/resources/typescript-fetch/api.mustache and reproduce the issue with maven install. Inspect the generated BaseAPI and RequiredError output, then compile the generated TypeScript to verify both reported errors are resolved.