fix: use btoa or atob directly without globalThis (there was an issue…

… on vercel middleware

packages/js-auth/src/utils/base64.spec.ts

@@ -9,15 +9,9 @@ const stringifiedObject = JSON.stringify({
 })
 
 describe('Using `Buffer`', () => {
-  runTests()
-})
-
-describe('Using `btoa` and `atob`', () => {
   beforeAll(() => {
-    vi.stubGlobal('window', {
-      atob: globalThis.atob,
-      btoa: globalThis.btoa
-    })
+    vi.stubGlobal('atob', undefined)
+    vi.stubGlobal('btoa', undefined)
   })
 
   afterAll(() => {
@@ -27,6 +21,10 @@ describe('Using `btoa` and `atob`', () => {
   runTests()
 })
 
+describe('Using `btoa` and `atob`', () => {
+  runTests()
+})
+
 function runTests(): void {
   describe('encodeBase64UrlSafe', () => {
     it('should be able to create a Base64 URL safe encoded ASCII string from a binary string.', () => {

packages/js-auth/src/utils/base64.ts

@@ -10,10 +10,9 @@
  * @returns An ASCII string containing the Base64 URL safe representation of `stringToEncode`.
  */
 export function encodeBase64URLSafe(stringToEncode: string): string {
-  if (typeof globalThis.btoa !== 'undefined') {
+  if (typeof btoa !== 'undefined') {
     return (
-      globalThis
-        .btoa(stringToEncode)
+      btoa(stringToEncode)
         // Remove padding equal characters
         .replaceAll('=', '')
         // Replace characters according to base64url specifications
@@ -37,8 +36,8 @@ export function encodeBase64URLSafe(stringToEncode: string): string {
  * @returns An ASCII string containing decoded data from `encodedData`.
  */
 export function decodeBase64URLSafe(encodedData: string): string {
-  if (typeof globalThis.atob !== 'undefined') {
-    return globalThis.atob(
+  if (typeof atob !== 'undefined') {
+    return atob(
       encodedData
         // Replace characters according to base64url specifications
         .replaceAll('-', '+')