@devloops/react-native-variant/lib/commonjs/Helpers/Hooks/useBackHandler.js.flow

react-native material ui library

import {useEffect} from 'react';
import {BackHandler} from 'react-native';

export default function useBackHandler(handler: () => void) {
  useEffect(() => {
    BackHandler.addEventListener('hardwareBackPress', handler);

    return () => {
      BackHandler.removeEventListener('hardwareBackPress', handler);
    };
  });
}