fix(fetch): defer global access in fetch adapter (#7260)

lib/adapters/fetch.js

@@ -18,13 +18,6 @@ const DEFAULT_CHUNK_SIZE = 64 * 1024;
 
 const { isFunction } = utils;
 
-const globalFetchAPI = (({ Request, Response }) => ({
-  Request,
-  Response,
-}))(utils.global);
-
-const { ReadableStream, TextEncoder } = utils.global;
-
 const test = (fn, ...args) => {
   try {
     return !!fn(...args);
@@ -34,11 +27,17 @@ const test = (fn, ...args) => {
 };
 
 const factory = (env) => {
+  const globalObject = utils.global ?? globalThis;
+  const { ReadableStream, TextEncoder } = globalObject;
+
   env = utils.merge.call(
     {
       skipUndefined: true,
     },
-    globalFetchAPI,
+    {
+      Request: globalObject.Request,
+      Response: globalObject.Response,
+    },
     env
   );
 

tests/unit/adapters/fetch.test.js

@@ -9,6 +9,7 @@ import {
   makeEchoStream,
 } from '../../setup/server.js';
 import axios from '../../../index.js';
+import utils from '../../../lib/utils.js';
 import { getFetch } from '../../../lib/adapters/fetch.js';
 import stream from 'stream';
 import { AbortController } from 'abortcontroller-polyfill/dist/cjs-ponyfill.js';
@@ -814,6 +815,24 @@ describe.runIf(typeof fetch === 'function')('supports fetch with nodejs', () =>
   });
 
   describe('env config', () => {
+    it('should fallback to globalThis when utils.global is temporarily undefined', () => {
+      const originalGlobal = utils.global;
+
+      try {
+        utils.global = undefined;
+
+        assert.doesNotThrow(() =>
+          getFetch({
+            env: {
+              fetch() {},
+            },
+          })
+        );
+      } finally {
+        utils.global = originalGlobal;
+      }
+    });
+
     it('should respect env fetch API configuration', async () => {
       const { data, headers } = await fetchAxios.get('/', {
         env: {