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!
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:
import NetInfo from '@react-native-community/netinfo'
import { onlineManager } from '@tanstack/react-query'
onlineManager.setEventListener(setOnline => {
return NetInfo.addEventListener(state => {
setOnline(!!state.isConnected)
})
})
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":
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()
}, [])
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()
}, [])
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.
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])
)
}
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.
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.
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
}
}
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:
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>;
};
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>;
};