App.js

import 'react-native-gesture-handler';
import React, {useEffect, Fragment} from 'react';
import Toast from 'react-native-toast-message';
import * as NavigationService from 'react-navigation-helpers';
import RNBootSplash from 'react-native-bootsplash';

import RootNavigator from './src/navigators';

const App = () => {
  useEffect(() => {
    const init = async () => {
      // …do multiple sync or async tasks
    };

    init().finally(async () => {
      await RNBootSplash.hide({fade: true});
      console.log('Bootsplash has been hidden successfully');
    });
  }, []);

  return (
    <Fragment>
      <RootNavigator />
      <Toast ref={ref => Toast.setRef(ref)} />
    </Fragment>
  );
};

export default App;