snapshot of https://github.com/TanStack/query.git (main, 2026-09-16; blobs > 131072B omitted)

integrations/react-next-15/app/_action.ts

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+'use server'
+
+import { revalidatePath } from 'next/cache'
+import { countRef } from './make-query-client'
+
+export async function queryExampleAction() {
+  await Promise.resolve()
+  countRef.current++
+  revalidatePath('/', 'page')
+  return undefined
+}

integrations/react-next-15/app/client-component.tsx

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+'use client'
+
+import React from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { Temporal } from '@js-temporal/polyfill'
+
+export function ClientComponent() {
+  const query = useQuery({
+    queryKey: ['data'],
+    queryFn: async () => {
+      const { count } = await (
+        await fetch('http://localhost:3000/count')
+      ).json()
+
+      return {
+        text: 'data from client',
+        date: Temporal.PlainDate.from('2023-01-01'),
+        count,
+      }
+    },
+  })
+
+  if (query.isPending) {
+    return <div>Loading...</div>
+  }
+
+  if (query.isError) {
+    return <div>An error has occurred!</div>
+  }
+
+  return (
+    <div>
+      {query.data.text} - {query.data.date.toJSON()} - {query.data.count}
+    </div>
+  )
+}

integrations/react-next-15/app/count/route.ts

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+import { countRef } from '../make-query-client'
+
+export const GET = () => {
+  return Response.json({ count: countRef.current })
+}

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

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+import React from 'react'
+import Providers from './providers'
+import type { Metadata } from 'next'
+
+export const metadata: Metadata = {
+  title: 'Create Next App',
+  description: 'Generated by create next app',
+}
+
+export default function RootLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return (
+    <html lang="en">
+      <body>
+        <Providers>{children}</Providers>
+      </body>
+    </html>
+  )
+}

integrations/react-next-15/app/make-query-client.ts

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+import { Temporal } from '@js-temporal/polyfill'
+import { QueryClient, defaultShouldDehydrateQuery } from '@tanstack/react-query'
+import { createTson } from 'tupleson'
+import type { TsonType } from 'tupleson'
+
+const plainDate = {
+  deserialize: (v) => Temporal.PlainDate.from(v),
+  key: 'PlainDate',
+  serialize: (v) => v.toJSON(),
+  test: (v) => v instanceof Temporal.PlainDate,
+} satisfies TsonType<Temporal.PlainDate, string>
+
+export const countRef = {
+  current: 0,
+}
+
+export const tson = createTson({
+  types: [plainDate],
+})
+
+export function makeQueryClient() {
+  return new QueryClient({
+    defaultOptions: {
+      hydrate: {
+        /**
+         * Called when the query is rebuilt from a prefetched
+         * promise, before the query data is put into the cache.
+         */
+        deserializeData: (data) => {
+          return tson.deserialize(data)
+        },
+      },
+      queries: {
+        staleTime: 60 * 1000,
+      },
+      dehydrate: {
+        serializeData: (data) => {
+          return tson.serialize(data)
+        },
+        shouldDehydrateQuery: (query) => {
+          return (
+            defaultShouldDehydrateQuery(query) ||
+            query.state.status === 'pending'
+          )
+        },
+        shouldRedactErrors: (error) => {
+          // Next.js automatically redacts errors for us
+          return false
+        },
+      },
+    },
+  })
+}

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

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+import { headers } from 'next/headers'
+import React from 'react'
+import { HydrationBoundary, dehydrate } from '@tanstack/react-query'
+import { Temporal } from '@js-temporal/polyfill'
+import { ClientComponent } from './client-component'
+import { makeQueryClient } from './make-query-client'
+import { queryExampleAction } from './_action'
+
+export default function Home() {
+  const queryClient = makeQueryClient()
+
+  queryClient.prefetchQuery({
+    queryKey: ['data'],
+    queryFn: async () => {
+      const { count } = await (
+        await fetch('http://localhost:3000/count', {
+          headers: await headers(),
+        })
+      ).json()
+
+      return {
+        text: 'data from server',
+        date: Temporal.PlainDate.from('2024-01-01'),
+        count,
+      }
+    },
+  })
+
+  const state = dehydrate(queryClient)
+
+  return (
+    <main>
+      <HydrationBoundary state={state}>
+        <ClientComponent />
+      </HydrationBoundary>
+      <form action={queryExampleAction}>
+        <button type="submit">Increment</button>
+      </form>
+    </main>
+  )
+}

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

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+// In Next.js, this file would be called: app/providers.tsx
+'use client'
+
+// Since QueryClientProvider relies on useContext under the hood, we have to put 'use client' on top
+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 (environmentManager.isServer()) {
+    // Server: always make a new query client
+    return makeQueryClient()
+  } else {
+    // Browser: make a new query client if we don't already have one
+    // This is very important, so we don't re-make a new client if React
+    // suspends during the initial render. This may not be needed if we
+    // have a suspense boundary BELOW the creation of the query client
+    if (!browserQueryClient) browserQueryClient = makeQueryClient()
+    return browserQueryClient
+  }
+}
+
+export default function Providers({ children }: { children: React.ReactNode }) {
+  // NOTE: Avoid useState when initializing the query client if you don't
+  //       have a suspense boundary between this and the code that may
+  //       suspend because React will throw away the client on the initial
+  //       render if it suspends and there is no boundary
+  const queryClient = getQueryClient()
+
+  return (
+    <QueryClientProvider client={queryClient}>
+      {children}
+      <ReactQueryDevtools />
+    </QueryClientProvider>
+  )
+}