React native websocket connection

sockets-react-native.js

import { Text, View, StyleSheet, Alert } from 'react-native';

navigator.__defineGetter__('userAgent', function () {
  // you have to import rect native first !!
  return 'react-native';
});

import SocketIOClient from 'socket.io-client/dist/socket.io.js';

//

useEffect(() => {
  const socket = SocketIOClient('wss://site-name.herokuapp.com/', {
    jsonp: false
  });
  socket.on('connect', () => {
    console.log('connected');
    socket.emit('hello', 'world');
  });

  socket.on('connect_error', (err) => {
    console.log(err instanceof Error);
    console.log(err.message);
  });
}, []);