// 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 { isServer, QueryClient, QueryClientProvider, } from "@tanstack/react-query"; function makeQueryClient() { return new QueryClient({ defaultOptions: { queries: { // With SSR, we usually want to set some default staleTime // above 0 to avoid refetching immediately on the client staleTime: 60 * 1000, retry: 1, }, }, }); } let browserQueryClient: QueryClient | undefined = undefined; function getQueryClient() { if (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 ( {children} ); }