old_contents: /* eslint consistent-return:0 */
  
  const express = require('express');
  const logger = require('./logger');
  
  const argv = require('minimist')(process.argv.slice(2));
  const setup = require('./middlewares/frontendMiddleware');
  const isDev = process.env.NODE_ENV !== 'production';
  const ngrok = (isDev && process.env.ENABLE_TUNNEL) || argv.tunnel ? require('ngrok') : false;
  const resolve = require('path').resolve;
  const app = express();
  
  // If you need a backend, e.g. an API, add your custom backend-specific middleware here
  // app.use('/api', myApi);
  
  // In production we need to pass these values in instead of relying on webpack
  setup(app, {
    outputPath: resolve(process.cwd(), 'build'),
    publicPath: '/',
  });
  
  // get the intended host and port number, use localhost and port 3000 if not provided
  const customHost = argv.host || process.env.HOST;
  const host = customHost || null; // Let http.Server use its default IPv6/4 host
  const prettyHost = customHost || 'localhost';
  
  const port = argv.port || process.env.PORT || 3000;
  
  // Start your app.
  app.listen(port, host, (err) => {
    if (err) {
      return logger.error(err.message);
    }
  
    // Connect to ngrok in dev mode
    if (ngrok) {
      ngrok.connect(port, (innerErr, url) => {
        if (innerErr) {
          return logger.error(innerErr);
        }
  
        logger.appStarted(port, prettyHost, url);
      });
    } else {
      logger.appStarted(port, prettyHost);
    }
  });
  
new_contents: /* eslint consistent-return:0 */
  
  const express = require('express');
  const mongoose = require('mongoose');
  const logger = require('./logger');
  
  const argv = require('minimist')(process.argv.slice(2));
  const setup = require('./middlewares/frontendMiddleware');
  const isDev = process.env.NODE_ENV !== 'production';
  const ngrok = (isDev && process.env.ENABLE_TUNNEL) || argv.tunnel ? require('ngrok') : false;
  const resolve = require('path').resolve;
  const app = express();
  
  mongoose.Promise = global.Promise;
  mongoose.connect(process.env.MONGO_URI);
  
  // If you need a backend, e.g. an API, add your custom backend-specific middleware here
  // app.use('/api', myApi);
  
  // In production we need to pass these values in instead of relying on webpack
  setup(app, {
    outputPath: resolve(process.cwd(), 'build'),
    publicPath: '/',
  });
  
  // get the intended host and port number, use localhost and port 3000 if not provided
  const customHost = argv.host || process.env.HOST;
  const host = customHost || null; // Let http.Server use its default IPv6/4 host
  const prettyHost = customHost || 'localhost';
  
  const port = argv.port || process.env.PORT || 3000;
  
  // Start your app.
  app.listen(port, host, (err) => {
    if (err) {
      return logger.error(err.message);
    }
  
    // Connect to ngrok in dev mode
    if (ngrok) {
      ngrok.connect(port, (innerErr, url) => {
        if (innerErr) {
          return logger.error(innerErr);
        }
  
        logger.appStarted(port, prettyHost, url);
      });
    } else {
      logger.appStarted(port, prettyHost);
    }
  });
  
subject: Add mongoose to server