fix(undiciRequest): file uploading

Author: almeidx

packages/rest/src/strategies/undiciRequest.ts

@@ -1,7 +1,7 @@
 import { STATUS_CODES } from 'node:http';
 import { URLSearchParams } from 'node:url';
 import { types } from 'node:util';
-import { type RequestInit, request, Headers, FormData as UndiciFormData } from 'undici';
+import { type RequestInit, request, Headers, FormData as UndiciFormData, Agent } from 'undici';
 import type { HeaderRecord } from 'undici/types/header.js';
 import type { ResponseLike } from '../shared.js';
 
@@ -14,6 +14,11 @@ export async function makeRequest(url: string, init: RequestInit): Promise<Respo
 		...init,
 		body: await resolveBody(init.body),
 	} as RequestOptions;
+
+	// Not setting a dispatcher makes requests fail whenever files are involved. So we set a default one.
+	// https://github.com/nodejs/node/issues/59012
+	options.dispatcher ??= new Agent();
+
 	const res = await request(url, options);
 	return {
 		body: res.body,