fix(NestJS): use correct typing for default headers (#10616)

* fix(NestJS):  use correct typing for default headers

closes #10615

* Update modules/openapi-generator/src/main/resources/typescript-nestjs/api.service.mustache

Co-authored-by: Alexey Makhrov <amakhrov@gmail.com>

* update

Co-authored-by: Alexey Makhrov <amakhrov@gmail.com>

Author: bilalshaikh42

modules/openapi-generator/src/main/resources/typescript-nestjs/api.service.mustache

@@ -28,7 +28,7 @@ export class {{classname}} {
 {{/withInterfaces}}
 
     protected basePath = '{{{basePath}}}';
-    public defaultHeaders = new Map()
+    public defaultHeaders: Record<string,string> = {};
     public configuration = new Configuration();
 
     constructor(protected httpClient: HttpService, @Optional() configuration: Configuration) {

samples/client/petstore/typescript-nestjs-v6-provided-in-root/builds/default/api/pet.service.ts

@@ -23,7 +23,7 @@ import { Configuration } from '../configuration';
 export class PetService {
 
     protected basePath = 'http://petstore.swagger.io/v2';
-    public defaultHeaders = new Map()
+    public defaultHeaders: Record<string,string> = {};
     public configuration = new Configuration();
 
     constructor(protected httpClient: HttpService, @Optional() configuration: Configuration) {

samples/client/petstore/typescript-nestjs-v6-provided-in-root/builds/default/api/store.service.ts

@@ -22,7 +22,7 @@ import { Configuration } from '../configuration';
 export class StoreService {
 
     protected basePath = 'http://petstore.swagger.io/v2';
-    public defaultHeaders = new Map()
+    public defaultHeaders: Record<string,string> = {};
     public configuration = new Configuration();
 
     constructor(protected httpClient: HttpService, @Optional() configuration: Configuration) {

samples/client/petstore/typescript-nestjs-v6-provided-in-root/builds/default/api/user.service.ts

@@ -22,7 +22,7 @@ import { Configuration } from '../configuration';
 export class UserService {
 
     protected basePath = 'http://petstore.swagger.io/v2';
-    public defaultHeaders = new Map()
+    public defaultHeaders: Record<string,string> = {};
     public configuration = new Configuration();
 
     constructor(protected httpClient: HttpService, @Optional() configuration: Configuration) {