tanstack-query-intent-compositions-persist-offline-and-ca66cce0

Setup

import * as React from 'react'
import { QueryClient } from '@tanstack/react-query'
import { PersistQueryClientProvider } from '@tanstack/react-query-persist-client'
import { createSyncStoragePersister } from '@tanstack/query-sync-storage-persister'

const queryClient = new QueryClient({
  defaultOptions: { queries: { gcTime: 24 * 60 * 60 * 1000 } },
})

const persister = createSyncStoragePersister({
  storage: window.localStorage,
})

export function AppProviders(props: { children: React.ReactNode }) { return ( <PersistQueryClientProvider client={queryClient} persistOptions={{ persister }} > {props.children} ) }

## Core Integration Patterns

### Resume paused mutations after restore

```ts
import { QueryClient } from '@tanstack/react-query'

export const queryClient = new QueryClient()

queryClient.setMutationDefaults(['todos'], {
  mutationFn: async (todo: { id: number; title: string }) => todo,
})

export function resumeMutations() {
  return queryClient.resumePausedMutations()
}

Align cache lifetime with persistence

import { QueryClient } from '@tanstack/react-query'

export const queryClient = new QueryClient({
  defaultOptions: {
    queries: { gcTime: 7 * 24 * 60 * 60 * 1000 },
  },
})

Use networkMode for offline-first writes

import { useMutation } from '@tanstack/react-query'

export function useSaveDraft() {
  return useMutation({
    mutationKey: ['saveDraft'],
    mutationFn: async (draft: { body: string }) => draft,
    networkMode: 'offlineFirst',
  })
}

Common Mistakes

HIGH gcTime shorter than maxAge

Wrong:

import { QueryClient } from '@tanstack/react-query'

export const queryClient = new QueryClient({
  defaultOptions: { queries: { gcTime: 5 * 60 * 1000 } },
})

Correct:

import { QueryClient } from '@tanstack/react-query'

export const queryClient = new QueryClient({
  defaultOptions: { queries: { gcTime: 24 * 60 * 60 * 1000 } },
})

Persisted data can be garbage-collected before the persister maxAge can restore it.

Source: TanStack/query:docs/framework/react/plugins/persistQueryClient.md

CRITICAL Rendering before restore

Wrong:

import { QueryClientProvider, QueryClient } from '@tanstack/react-query'

const queryClient = new QueryClient()
export function App(props: { children: React.ReactNode }) {
  return (
    <QueryClientProvider client={queryClient}>
      {props.children}
    </QueryClientProvider>
  )
}

Correct:

import { QueryClient } from '@tanstack/react-query'
import { PersistQueryClientProvider } from '@tanstack/react-query-persist-client'
import { createSyncStoragePersister } from '@tanstack/query-sync-storage-persister'

const queryClient = new QueryClient()
const persister = createSyncStoragePersister({ storage: window.localStorage })

export function App(props: { children: React.ReactNode }) {
  return (
    <PersistQueryClientProvider
      client={queryClient}
      persistOptions={{ persister }}
    >
      {props.children}
    </PersistQueryClientProvider>
  )
}

The persistence provider prevents query fetching while restore is in progress.

Source: TanStack/query:docs/framework/react/plugins/persistQueryClient.md

CRITICAL Missing default mutationFn

Wrong:

import { QueryClient } from '@tanstack/react-query'

export const queryClient = new QueryClient()

Correct:

import { QueryClient } from '@tanstack/react-query'

export const queryClient = new QueryClient()
queryClient.setMutationDefaults(['saveDraft'], {
  mutationFn: async (draft: { body: string }) => draft,
})

Paused persisted mutations cannot resume without a serializable mutation key mapped to a default mutationFn.

Source: TanStack/query:docs/framework/react/plugins/persistQueryClient.md

See also: core/tune-defaults-freshness-retries-and-refetching for gcTime and networkMode.