[TypeScript-*] Generating array of enum values fails to create TS enums

Description

Basically trying to combine type: array and enum: [ ... ] within a single field, so we can limit the possible parameters to be passed, as seen in the official docs here.

There are two ways to do this; one is specifying directly in-place, another is to give reference to a definition, and the both cases fail similarly to create the enum values on TypeScript models. In other words, enum definitions within the swagger spec fades away and has no effect.

Swagger-codegen version

Latest master; 802641b.

Swagger declaration file content or url

swagger: "2.0"
info:
  version: "1.0"
  title: "Hello World API"
paths:
  /hello:
    get:
      parameters:
        - name: myData
          in: body
          schema:
            properties:
              myNumbersField:
                # In-place field spec:
                type: array
                items:
                  type: number
                  enum:
                    - 1
                    - 2
              myStringsField:
                # Reference to the definition: 
                $ref: '#/definitions/ArrayOfStringChoicesModel'
      responses:
        200:
          description: Returns the greeting.

definitions:
  ArrayOfStringChoicesModel:
    type: array
    items:
      type: string
      enum:
        - foo
        - bar

Example output (typescript/fetch):

export interface ArrayOfStringChoicesModel extends Array<string> {
}

export interface MyData {
    "myNumbersField"?: Array<number>;
    "myStringsField"?: ArrayOfStringChoicesModel;
}

That has no enum values defined at all.

Even though, I change the field type from array to any primitive, in-place enum definitions still disappear when generated:

  myNumbersField:
    type: number
    enum:
      - 1
      - 2

  ArrayOfStringChoicesModel:
    type: string
    enum:
      - foo
      - bar

Example output (typescript/angular2 this time):

export interface MyData {
    myNumbersField?: number; // <------ where are the numeric enums?
    myStringsField?: models.ArrayOfStringChoicesModel;
}

export enum ArrayOfStringChoicesModel {
    Foo = <any> 'foo',
    Bar = <any> 'bar'
}

Command line used for generation

Regular java -jar swagger-codegen-cli.jar generate -i spec.yml -l {language} call with any of the typescript/framework pair as far as I'm aware of:

• typescript-angular2
• typescript-angular
• typescript-jquery
• typescript-node
• typescript-fetch

Steps to reproduce

Most convenient way to reproduce (perhaps with the latest stable) is swagger editor:

1. Go to http://editor.swagger.io/
2. Paste the above spec yaml
3. Generate client / download any of the TypeScript choice.
4. Alternatively, run the generate command with the given yaml spec

Related issues

• This also reproduces the bug #3616 for typescript/angular2, which will be ignored here.
• Not to be confused with already resolved issue #4577.
• Might have weak relation to #2739.

Suggest a Fix

Can help if the issue is addressed correctly.

Start by running the provided Swagger 2.0 YAML through the swagger-codegen CLI for the listed TypeScript generators and compare the generated models with the examples. Trace TypeScript client generation from that command and verify that both inline and referenced array-item enums are preserved in the output for all affected generators.