fix(examples/integrations): replace deprecated 'isServer' with 'environmentManager.isServer()' in the Next.js examples (#10858)

Author: sukvvon

examples/react/nextjs-suspense-streaming/src/app/page.tsx

@@ -1,11 +1,11 @@
 'use client'
-import { isServer, useSuspenseQuery } from '@tanstack/react-query'
+import { environmentManager, useSuspenseQuery } from '@tanstack/react-query'
 import { Suspense } from 'react'
 
 export const runtime = 'edge' // 'nodejs' (default) | 'edge'
 
 function getBaseURL() {
-  if (!isServer) {
+  if (!environmentManager.isServer()) {
     return ''
   }
   if (process.env.VERCEL_URL) {

integrations/react-next-15/app/providers.tsx

@@ -2,15 +2,15 @@
 'use client'
 
 // Since QueryClientProvider relies on useContext under the hood, we have to put 'use client' on top
-import { QueryClientProvider, isServer } from '@tanstack/react-query'
+import { QueryClientProvider, environmentManager } from '@tanstack/react-query'
 import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
 import type { QueryClient } from '@tanstack/react-query'
 import { makeQueryClient } from '@/app/make-query-client'
 
 let browserQueryClient: QueryClient | undefined = undefined
 
 function getQueryClient() {
-  if (isServer) {
+  if (environmentManager.isServer()) {
     // Server: always make a new query client
     return makeQueryClient()
   } else {

integrations/react-next-16/app/providers.tsx

@@ -2,15 +2,15 @@
 'use client'
 
 // Since QueryClientProvider relies on useContext under the hood, we have to put 'use client' on top
-import { QueryClientProvider, isServer } from '@tanstack/react-query'
+import { QueryClientProvider, environmentManager } from '@tanstack/react-query'
 import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
 import type { QueryClient } from '@tanstack/react-query'
 import { makeQueryClient } from '@/app/make-query-client'
 
 let browserQueryClient: QueryClient | undefined = undefined
 
 function getQueryClient() {
-  if (isServer) {
+  if (environmentManager.isServer()) {
     // Server: always make a new query client
     return makeQueryClient()
   } else {