nodemailer: fetch returns Writable with extra properties

types/nodemailer/lib/fetch/index.d.ts

@@ -4,12 +4,18 @@ type ms = number;
 
 import _Cookies = require('./cookies');
 
+import * as http from 'http';
 import { Writable } from 'stream';
 import * as tls from 'tls';
 
 declare namespace fetch {
     type Cookies = _Cookies;
 
+    interface WritableResponse extends Writable {
+        statusCode: number;
+        headers: http.IncomingHttpHeaders;
+    }
+
     interface Options {
         fetchRes?: Writable;
         cookies?: Cookies;
@@ -27,6 +33,6 @@ declare namespace fetch {
     }
 }
 
-declare function fetch(url: string, options?: fetch.Options): Writable;
+declare function fetch(url: string, options?: fetch.Options): fetch.WritableResponse;
 
 export = fetch;

types/nodemailer/nodemailer-tests.ts

@@ -1090,7 +1090,11 @@ function base64_test() {
 // fetch
 
 function fetch_test() {
-    fetch('http://localhost/');
+    const stream = fetch('http://localhost/');
+
+    const statusCode: number = stream.statusCode;
+    const headers = stream.headers;
+    const contentType: string | undefined = headers['content-type'];
 
     fetch('http://localhost:/', {
         allowErrorResponse: true,