Back hardware react native

backReactNative.js

import { BackHandler } from 'react-native';

componentWillMount() {
    BackHandler.addEventListener('hardwareBackPress', this.onBackPress.bind(this));
}

onBackPress(){
    if(this.props.isAuthenticated){
      const { state, dispatch } = this.props.navigation;

      dispatch({
        type: 'Reset',
        index: 0,
        actions: [
          {
            type: 'Navigate',
            routeName: 'list',
          },
        ],
      });
    }
  }