import type { NavigationContainerRef , ParamListBase , } from '@react-navigation/core' ; import * as React from 'react' ; import { BackHandler } from 'react-native' ; export default function useBackButton ( ref ) { React . useEffect ( ( ) => { const subscription = BackHandler . addEventListener ( 'hardwareBackPress' , ( ) => { const navigation = ref . current ; if ( navigation == null ) { return false ; } if ( navigation . canGoBack ( ) ) { navigation . goBack ( ) ; return true ; } return false ; } ) ; return ( ) => subscription . remove ( ) ; } , [ ref ] ) ; }