App/index.js

import 'react-native-gesture-handler';
import {AppRegistry} from 'react-native';
import App from './App';
import {name as appName} from './app.json';
import { PlaybackService } from './player/service'
import TrackPlayer from 'react-native-track-player';
import Client from './api/client';

AppRegistry.registerComponent(appName, () => App);
TrackPlayer.registerPlaybackService(() => PlaybackService);
Client.instance;