registerComponent(componentName: string, getComponentClassFunc: ComponentProvider, ReduxProvider?: any, reduxStore?: any): ComponentProvider {
   const NavigationComponent = () => {
     return this.ComponentWrapperClass.wrap(componentName, getComponentClassFunc, this.store, this.componentEventsObserver, ReduxProvider, reduxStore)
   };
   this.store.setComponentClassForName(componentName, NavigationComponent);
   AppRegistry.registerComponent(componentName, NavigationComponent);
   return NavigationComponent;
 }

 registerComponent(appKey: string, getComponentFunc: ComponentProvider) {
   AppRegistry.registerComponent(appKey, getComponentFunc);
 }

    public async start(): Promise<void> {
        let applicationState = await this.onInitialize();
        let applicationComponent = await this.onGetRootComponent(applicationState);

        AppRegistry.registerComponent(this._appKey, () => applicationComponent);
    }

import App from './App';
import React, { Component } from 'react';
import { AppRegistry } from 'react-native';

// register the app
AppRegistry.registerComponent('App', () => App);

AppRegistry.runApplication('App', {
    initialProps: {},
    rootTag: document.getElementById('react-app')
});

import { AppRegistry } from 'react-native'
import App from '../components/App'

AppRegistry.registerComponent('PlayProject', () => App)