chore(npm): update dependency undici to v6.14.1 (#807)

* chore(npm): update dependency undici to v6.14.1

* chore: fix types for undici v6.7.0
* related: nodejs/undici#2708

* chore: fix types for undici v6.12.0
* related: nodejs/undici#3050

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: 3846masa <3846masahiro+git@gmail.com>

package.json

@@ -95,7 +95,7 @@
     "superagent": "9.0.1",
     "tough-cookie": "4.1.3",
     "typescript": "5.4.5",
-    "undici": "6.6.2",
+    "undici": "6.14.1",
     "urllib": "3.24.0"
   },
   "peerDependencies": {

src/undici/cookie_handler.ts

@@ -40,7 +40,7 @@ class CookieHandler implements Required<Dispatcher.DispatchHandlers> {
     this[kHandlers].onUpgrade?.(statusCode, headers, socket);
   };
 
-  onHeaders = (statusCode: number, _headers: string[] | null, resume: () => void, statusText: string): boolean => {
+  onHeaders = (statusCode: number, _headers: Buffer[], resume: () => void, statusText: string): boolean => {
     if (this[kHandlers].onHeaders == null) {
       throw new errors.InvalidArgumentError('invalid onHeaders method');
     }

src/undici/utils/convert_to_headers_object.ts

@@ -2,8 +2,17 @@
 import { errors } from 'undici';
 import type { IncomingHttpHeaders } from 'undici/types/header';
 
+function isIterable(value: unknown): value is Iterable<unknown> {
+  return typeof value === 'object' && value != null && Symbol.iterator in value;
+}
+
 function convertToHeadersObject(
-  _headers: IncomingHttpHeaders | (string | Buffer)[] | null | undefined,
+  _headers:
+    | IncomingHttpHeaders
+    | (string | Buffer)[]
+    | Iterable<[string, string | string[] | undefined]>
+    | null
+    | undefined,
 ): IncomingHttpHeaders {
   const headers: IncomingHttpHeaders = {};
 
@@ -27,6 +36,10 @@ function convertToHeadersObject(
         }
       }
     }
+  } else if (isIterable(_headers)) {
+    for (const [key, value] of _headers) {
+      headers[key.toLowerCase()] = value;
+    }
   } else if (_headers != null) {
     for (const [key, value] of Object.entries(_headers)) {
       headers[key.toLowerCase()] = value;