[BUG] [typescript] Type for map>array>item generated but not imported

[bard]

Same as #6192, but affecting the new typescript generator from #6341 instead of typescript-fetch. Updated description, error messages and repro below.

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? 4.3.1
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

When an item of an array of a map is specified through a referenced schema, the model type for the item is not imported into DefaultApi.ts.

For example, for an endpoint specification of:

  "/characters":
    get:
      responses:
        "200":
          content:
            application/json:
              schema:
                additionalProperties:
                  type: array
                  items:
                    $ref: "#/components/schemas/Character"

And a schema specification of:

    Character:
      required: ["first", "name"]
      properties:
        id:
          type: integer
        name:
          type: string

Compiling results in the following error:

Failed to compile.

/tmp/test-openapigen/src/api/apis/DefaultApi.ts
TypeScript error in /tmp/test-openapigen/src/api/apis/DefaultApi.ts(54,92):
Cannot find name 'Character'.  TS2304

    52 |      * @throws ApiException if the response code was not in [200, 299]
    53 |      */
  > 54 |      public async charactersGet(response: ResponseContext): Promise<{ [key: string]: Array<Character>; } > {
       |                                                                                            ^
    55 |         const contentType = ObjectSerializer.normalizeMediaType(response.headers["content-type"]);
    56 |         if (isCodeInRange("200", response.httpStatusCode)) {
    57 |             const body: { [key: string]: Array<Character>; } = ObjectSerializer.deserialize(

openapi-generator version

5.0.0-SNAPSHOT

OpenAPI declaration file content or url

https://github.com/bard/openapi-generator-missing-type-2/blob/master/example.yaml

Command line used for generation

OPENAPI_GENERATOR_VERSION=5.0.0-SNAPSHOT /tmp/openapi-generator-cli.sh generate -g typescript -i example.yaml -o ./src/api

Steps to reproduce

1. Clone https://github.com/bard/openapi-generator-missing-type-2
2. Run OPENAPI_GENERATOR_VERSION=5.0.0-SNAPSHOT /tmp/openapi-generator-cli.sh generate -g typescript -i example.yaml -o ./src/api
3. Run yarn && yarn start

Related issues/PRs

#5995 seems to solve a similar issue

Suggest a fix

Import the missing type into DefaultApi.ts:

// TODO: better import syntax?
  import { BaseAPIRequestFactory, RequiredError } from './baseapi';
  import {Configuration} from '../configuration';
  import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
  import {ObjectSerializer} from '../models/ObjectSerializer';
  import {ApiException} from './exception';
  import {isCodeInRange} from '../util';
+ import {Character} from '../models/Character'
  
  
  /**
   * no description
   */
  export class DefaultApiRequestFactory extends BaseAPIRequestFactory {

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