update tests related to browser headers

src/api.js

@@ -176,7 +176,7 @@ async function request(
     headers: reqHeaders,
     body: reqBody,
     // Credentials and mode are only available in the browser
-    ...(typeof window !== 'undefined' && window.document
+    ...(!utils.isServer()
       ? {
           credentials: 'include',
           mode: 'cors',

src/api.test.js

@@ -71,20 +71,48 @@ describe('api', () => {
       });
     });
 
-    it('should make a fetch request with credentials', async () => {
+    it('should make a fetch request without credentials', async () => {
       await api.request('get', '/test');
 
       expect(fetch.mock.calls.length).toEqual(1);
-      expect(fetch.mock.calls[0][1]).toHaveProperty('credentials', 'include');
+      expect(fetch.mock.calls[0][1]).not.toHaveProperty(
+        'credentials',
+        'include',
+      );
     });
 
-    it('should make a fetch request with cors', async () => {
+    it('should make a fetch request without cors', async () => {
       await api.request('get', '/test');
 
       expect(fetch.mock.calls.length).toEqual(1);
-      expect(fetch.mock.calls[0][1]).toHaveProperty('mode', 'cors');
+      expect(fetch.mock.calls[0][1]).not.toHaveProperty('mode', 'cors');
     });
 
+    describe('when making a request from the browser', () => {
+      beforeEach(() => {
+        // simulate browser
+        global.window = { document: {} };
+      });
+
+      afterEach(() => {
+        delete global.window;
+      });
+
+      it('should make a fetch request with credentials', async () => {
+        await api.request('get', '/test');
+
+        expect(fetch.mock.calls.length).toEqual(1);
+        expect(fetch.mock.calls[0][1]).toHaveProperty('credentials', 'include');
+      });
+
+      it('should make a fetch request with cors', async () => {
+        await api.request('get', '/test');
+
+        expect(fetch.mock.calls.length).toEqual(1);
+        expect(fetch.mock.calls[0][1]).toHaveProperty('mode', 'cors');
+      });
+    }); // describe: when making a request from the browser
+
     it('should trim url', async () => {
       await api.request('get', '///test///');
 

src/cookie.js

@@ -7,7 +7,7 @@ function getCookie(name) {
     return undefined;
   }
 
-  const matches = document.cookie.match(
+  const matches = window.document.cookie?.match(
     new RegExp(
       '(?:^|; )' + name.replace(/([.$?*|{}()[]\\\/\+^])/g, '\\$1') + '=([^;]*)',
     ),

src/utils/index.js

@@ -121,7 +121,7 @@ function reduce(arr, cb, init) {
 }
 
 function isServer() {
-  return !(typeof window !== 'undefined' && window && window.document);
+  return !(typeof window !== 'undefined' && window?.document);
 }
 
 function isFunction(func) {