Use instance code in angular

let app = require('express')();
let http = require('http').Server(app);
let io = require('')(http);

('connection', (socket) => {
 ('user connected');
 
 ('disconnect', function(){
  ('user disconnected');
 });
 
 ('add-message', (message) => {
  ('message', {type:'new-message', text: message});  
 });
});

(5000, () => {
 ('started on port 5000');
});

import { Subject } from 'rxjs/Subject';
import { Observable } from 'rxjs/Observable';
import * as io from '-client';

export class ChatService {
 private url = 'http://localhost:5000'; 
 private socket;
 
 sendMessage(message){
  ('add-message', message);  
 }
 
 getMessages() {
  let observable = new Observable(observer => {
    = io();
   ('message', (data) => {
    (data);  
   });
   return () => {
    ();
   }; 
  })   
  return observable;
 } 
}

import { Component, OnInit, OnDestroy } from '@angular/core';
import { Control }      from '@angular/common';
import { ChatService }    from './';

@Component({
 moduleId: ,
 selector: 'chat',
 template: `<div *ngFor="let message of messages">
           {{}}
          </div>
          <input [(ngModel)]="message" /><button (click)="sendMessage()">Send</button>`,
 providers: [ChatService]
})
export class ChatComponent implements OnInit, OnDestroy {
 messages = [];
 connection;
 message;
 
 constructor(private chatService:ChatService) {}

 sendMessage(){
  ();
   = '';
 }

 ngOnInit() {
   = ().subscribe(message => {
   (message);
  })
 }
 
 ngOnDestroy() {
  ();
 }
}