import { useState , useEffect , useRef } from "react" ; import { BackHandler } from "react-native" ; import { PartialState , NavigationState , NavigationAction , createNavigationContainerRef , } from "@react-navigation/native" ; export const RootNavigation = { navigate ( _name , _params ? ) { } , goBack ( ) { } , resetRoot ( _state ? ) { } , getRootState ( ) { return { } as any ; } , dispatch ( _action ) { } , } ; export const navigationRef = createNavigationContainerRef ( ) ; /**
 * Gets the current screen from any navigation state.
 */ export function getActiveRouteName ( state ) { const route = state . routes [ state . index ] ; if ( ! route . state ) return route . name ; return getActiveRouteName ( route . state ) ; } /**
 * Hook that handles Android back button presses and forwards those on to
 * the navigation or allows exiting the app.
 */ export function useBackButtonHandler ( canExit ) { const canExitRef = useRef ( canExit ) ; useEffect ( ( ) => { canExitRef . current = canExit ; } , [ canExit ] ) ; useEffect ( ( ) => { const onBackPress = ( ) => { if ( ! navigationRef . isReady ( ) ) { return false ; } const routeName = getActiveRouteName ( navigationRef . getRootState ( ) ) ; if ( canExitRef . current ( routeName ) ) { BackHandler . exitApp ( ) ; return true ; } if ( navigationRef . canGoBack ( ) ) { navigationRef . goBack ( ) ; return true ; } return false ; } ; BackHandler . addEventListener ( "hardwareBackPress" , onBackPress ) ; return ( ) => BackHandler . removeEventListener ( "hardwareBackPress" , onBackPress ) ; } , [ ] ) ; } /**
 * Custom hook for persisting navigation state.
 */ export function useNavigationPersistence ( storage , persistenceKey ) { const [ initialNavigationState , setInitialNavigationState ] = useState ( ) ; const [ isRestored , setIsRestored ] = useState ( ! __DEV__ ) ; const routeNameRef = useRef < string | undefined > ( ) ; const onNavigationStateChange = ( state ) => { const previousRouteName = routeNameRef . current ; const currentRouteName = getActiveRouteName ( state ) ; if ( previousRouteName !== currentRouteName ) { __DEV__ && console . tron . log ( currentRouteName ) ; } routeNameRef . current = currentRouteName ; storage . save ( persistenceKey , state ) ; } ; const restoreState = async ( ) => { try { const state = await storage . load ( persistenceKey ) ; if ( state ) setInitialNavigationState ( state ) ; } finally { setIsRestored ( true ) ; } } ; useEffect ( ( ) => { if ( ! isRestored ) restoreState ( ) ; } , [ isRestored ] ) ; return { onNavigationStateChange , restoreState , isRestored , initialNavigationState } ; } /**
 * use this to navigate to navigate without the navigation
 * prop. If you have access to the navigation prop, do not use this.
 * More info: https://reactnavigation.org/docs/navigating-without-navigation-prop/
 */ export function navigate ( name , params ? ) { if ( navigationRef . isReady ( ) ) { navigationRef . navigate ( name as never , params as never ) ; } } export function goBack ( ) { if ( navigationRef . isReady ( ) && navigationRef . canGoBack ( ) ) { navigationRef . goBack ( ) ; } } export function resetRoot ( params = { index : 0 , routes : [ ] } ) { if ( navigationRef . isReady ( ) ) { navigationRef . resetRoot ( params ) ; } }