fix(examples): replace deprecated 'isServer' with 'environmentManager.isServer()' in remaining Next.js examples (#10860)

Author: spiderocious

examples/react/nextjs-app-prefetching/app/get-query-client.ts

@@ -1,7 +1,7 @@
 import {
   QueryClient,
   defaultShouldDehydrateQuery,
-  isServer,
+  environmentManager,
 } from '@tanstack/react-query'
 
 function makeQueryClient() {
@@ -23,7 +23,7 @@ function makeQueryClient() {
 let browserQueryClient: QueryClient | undefined = undefined
 
 export function getQueryClient() {
-  if (isServer) {
+  if (environmentManager.isServer()) {
     // Server: always make a new query client
     return makeQueryClient()
   } else {

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

@@ -3,7 +3,7 @@
 import {
   QueryClient,
   QueryClientProvider,
-  isServer,
+  environmentManager,
 } from '@tanstack/react-query'
 import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
 import * as React from 'react'
@@ -22,7 +22,7 @@ function makeQueryClient() {
 let browserQueryClient: QueryClient | undefined = undefined
 
 function getQueryClient() {
-  if (isServer) {
+  if (environmentManager.isServer()) {
     return makeQueryClient()
   } else {
     if (!browserQueryClient) browserQueryClient = makeQueryClient()