app.ts

var express 	= require('express');
var path 		= require('path');
var favicon		= require('serve-favicon');
var bodyParser	= require('body-parser');
var http 		= require('http');

var app = express();
var port = process.env.PORT || '3000';
app.set('port', port);
app.use(favicon(__dirname + '/favicon.ico'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

// app.use(express.static(__dirname + '/node_modules'));
// app.use(express.static(__dirname + '/index.html'));
// app.use(express.static(path.join(__dirname, 'app')));
app.use(express.static(__dirname));

app.get('*', function(req, res){
    res.sendFile( __dirname + '/index.html' );
});

// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {

  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.json({
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.json({
    message: err.message,
    error: {}
  });
});


var server = http.createServer(app);

server.listen(port, function () {
  console.log('Listening on port' + port);
});
server.on('error', onError);
server.on('listening', onListening);

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
}