React Native

React Native

React Query is designed to work out of the box with React Native, with the exception of the devtools, which are only supported with React DOM at this time.

There is a 3rd party Flipper plugin which you can try: https://github.com/bgaleotti/react-query-native-devtools

There is a 3rd party Reactotron plugin which you can try: https://github.com/hsndmr/reactotron-react-query

If you would like to help us make the built-in devtools platform agnostic, please let us know!

Online status management

React Query already supports auto refetch on reconnect in web browser. To add this behavior in React Native you have to use React Query onlineManager as in the example below:

tsx

import NetInfo from '@react-native-community/netinfo'
import { onlineManager } from '@tanstack/react-query'

onlineManager.setEventListener(setOnline => {
  return NetInfo.addEventListener(state => {
    setOnline(!!state.isConnected)
  })
})

Instead of event listeners on window, React Native provides focus information through the AppState module. You can use the AppState "change" event to trigger an update when the app state changes to "active":

tsx

import { useEffect } from "react"
import { AppState, Platform } from 'react-native'
import type { AppStateStatus } from "react-native"
import { focusManager } from '@tanstack/react-query'

function onAppStateChange(status: AppStateStatus) {
  if (Platform.OS !== 'web') {
    focusManager.setFocused(status === 'active')
  }
}

useEffect(() => {
  const subscription = AppState.addEventListener('change', onAppStateChange)

  return () => subscription.remove()
}, [])

Refresh on Screen focus

In some situations, you may want to refetch the query when a React Native Screen is focused again. This custom hook will call the provided refetch function when the screen is focused again.

tsx

import React from 'react'
import { useFocusEffect } from '@react-navigation/native'

export function useRefreshOnFocus<T>(refetch: () => Promise<T>) {
  const firstTimeRef = React.useRef(true)

  useFocusEffect(
    React.useCallback(() => {
      if (firstTimeRef.current) {
         firstTimeRef.current = false;
         return;
      }

      refetch()
    }, [refetch])
  )
}

In the above code, refetch is skipped the first time because useFocusEffect calls our callback on mount in addition to screen focus.

Disable re-renders on out of focus Screens

In some situations, including performance concerns, you may want to stop re-renders when a React Native screen gets out of focus. To achieve this we can use useFocusEffect from @react-navigation/native together with the notifyOnChangeProps query option.

This custom hook provides a notifyOnChangeProps option that will return an empty array whenever a screen goes out of focus - effectively stopping any re-renders on that scenario. Whenever the screens gets in focus again, the behavior goes back to normal.

tsx

import React from 'react'
import { NotifyOnChangeProps } from '@tanstack/query-core'
import { useFocusEffect } from '@react-navigation/native'

export function useFocusNotifyOnChangeProps(notifyOnChangeProps?: NotifyOnChangeProps) {
  const focusedRef = React.useRef(true)

  useFocusEffect(
    React.useCallback(() => {
      focusedRef.current = true

      return () => {
        focusedRef.current = false
      }
    }, [])
  )

  return () => {
    if (!focusedRef.current) {
      return []
    }

    if (typeof notifyOnChangeProps === 'function') {
      return notifyOnChangeProps()
    }

    return notifyOnChangeProps.current
  }
}

In the above code, useFocusEffect is used to change the value of a reference that the callback will use as a condition.

The argument is wrapped in a reference to also guarantee that the returned callback always keeps the same reference.

Example usage:

tsx

function MyComponent() {
  const notifyOnChangeProps = useFocusNotifyOnChangeProps();

  const { dataUpdatedAt } = useQuery({
    queryKey: ['myKey'],
    queryFn: async () => {
      const response = await fetch('https://api.github.com/repos/tannerlinsley/react-query');
      return response.json();
    },
    notifyOnChangeProps,
  });

  return <Text>DataUpdatedAt: {dataUpdatedAt}</Text>;
};

Online status management

Refetch on App focus

Refresh on Screen focus

Disable re-renders on out of focus Screens

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