fix(supabase): avoid dropping realtime auth to manual mode on client init

packages/core/supabase-js/src/SupabaseClient.ts

@@ -385,10 +385,9 @@ export default class SupabaseClient<
       ...settings.realtime,
     })
     if (this.accessToken) {
-      // Start auth immediately to avoid race condition with channel subscriptions
-      // Wrap Promise to avoid Firefox extension cross-context Promise access errors
-      Promise.resolve(this.accessToken())
-        .then((token) => this.realtime.setAuth(token))
+      // Start auth immediately to avoid a race with channel subscriptions
+      this.realtime
+        .setAuth()
         .catch((e) => console.warn('Failed to set initial Realtime auth token:', e))
     }
 

packages/core/supabase-js/test/unit/SupabaseClient.test.ts

@@ -299,21 +299,21 @@ describe('SupabaseClient', () => {
         jest.clearAllMocks()
       })
 
-      test('should automatically call setAuth() when accessToken option is provided', async () => {
+      test('should automatically call setAuth() in callback mode when accessToken option is provided', async () => {
         const customToken = 'custom-jwt-token'
         const customAccessTokenFn = jest.fn().mockResolvedValue(customToken)
 
         const client = createClient(URL, KEY, { accessToken: customAccessTokenFn })
-        const setAuthSpy = jest.spyOn(client.realtime, 'setAuth')
 
-        // Wait for the constructor's async operation to complete
-        await Promise.resolve()
+        // Flush microtask queue to wait for constructor setting auth
+        await new Promise((resolve) => setTimeout(resolve))
 
-        expect(setAuthSpy).toHaveBeenCalledWith(customToken)
+        // Realtime acquires auth token without dropping to manual mode
         expect(customAccessTokenFn).toHaveBeenCalled()
+        expect(client.realtime.accessTokenValue).toBe(customToken)
+        expect((client.realtime as any)._isManualToken()).toBe(false)
 
         // Clean up
-        setAuthSpy.mockRestore()
         client.realtime.disconnect()
       })
 
@@ -332,24 +332,20 @@ describe('SupabaseClient', () => {
       })
 
       test('should handle errors gracefully when accessToken callback fails', async () => {
-        const consoleWarnSpy = jest.spyOn(console, 'warn').mockImplementation(() => {})
         const error = new Error('Token fetch failed')
         const failingAccessTokenFn = jest.fn().mockRejectedValue(error)
 
         const client = createClient(URL, KEY, { accessToken: failingAccessTokenFn })
 
-        // Wait for the promise to reject and warning to be logged
-        await Promise.resolve()
-        await Promise.resolve()
+        // Flush microtask queue to wait for constructor setting auth
+        await new Promise((resolve) => setTimeout(resolve))
 
-        expect(consoleWarnSpy).toHaveBeenCalledWith(
-          'Failed to set initial Realtime auth token:',
-          error
-        )
+        expect(failingAccessTokenFn).toHaveBeenCalled()
         expect(client).toBeDefined()
         expect(client.realtime).toBeDefined()
+        // Stays in callback mode so a later setAuth() retries the callback
+        expect((client.realtime as any)._isManualToken()).toBe(false)
 
-        consoleWarnSpy.mockRestore()
         client.realtime.disconnect()
       })