text: #!/usr/bin/env node
  
  /**
   * Parsed Env variables
   */
  // eslint-disable-next-line import/order
  import {} from './dotenv';
  
  /**
   * Module dependencies.
   */
  
  import mongoose from 'mongoose';
  import debugModule from 'debug';
  import { createServer } from 'http';
  
  import app from '../app';
  
  const debug = debugModule('server:server');
  
  /**
   * Normalize a port into a number, string, or false.
   */
  
  function normalizePort(val) {
    const port = parseInt(val, 10);
  
    // eslint-disable-next-line no-restricted-globals
    if (isNaN(port)) {
      // named pipe
      return val;
    }
  
    if (port >= 0) {
      // port number
      return port;
    }
  
    return false;
  }
  
  /**
   * Get port from environment and store in Express.
   */
  
  const port = normalizePort(process.env.PORT || '3000');
  app.set('port', port);
  
  /**
   * Create HTTP server.
   */
  
  const server = createServer(app);
  
  /**
   * Event listener for HTTP server "error" event.
   */
  
  function onError(error) {
    if (error.syscall !== 'listen') {
      throw error;
    }
  
    const 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() {
    console.log(`Server started at ${process.env.PORT}`);
    const addr = server.address();
    const bind = typeof addr === 'string' ? `pipe ${addr}` : `port ${addr.port}`;
    debug(`Listening on ${bind}`);
  }
  
  function connect() {
    console.log('Connecting to database at', process.env.DB_URI);
    mongoose.connect(process.env.DB_URI, {
      useNewUrlParser: true,
    });
    return mongoose.connection;
  }
  
  /**
   * Listen on provided port, on all network interfaces.
   */
  function listen() {
    server.listen(port);
    server.on('error', onError);
    server.on('listening', onListening);
  }
  
  /**
   * Connect to database before starting server
   */
  connect()
    .on('error', console.log)
    .on('disconnected', connect)
    .once('open', listen);
  