old_contents: 'use strict'
  const mongoose = require('mongoose')
  const api = require('./api')
  const trends = require('./twitter/trends')
  const config = require('./config')
  const mainUtils = require('./utils/main-utils')
  const TweetStream = require('./twitter/tweet-stream')
  
  mongoose.Promise = global.Promise
  
  // Connect to the db, then set up the intervalFunction
  var db = mongoose.connection
  db.on('error', console.error)
  db.once('open', () => {
    console.log('Successfully connected to mongodb')
  
    // Run the intervalFunction when the backend starts
    intervalFunction()
  
    // Then set up intervalFunction to run each server interval
    setInterval(intervalFunction, config.intervalLength * 1000)
  
    api.start()
  })
  mongoose.connect('mongodb://' + config.dbAddress + '/' + config.dbName)
  
  /**
   * Function run once every server interval, gets trends from the
   * Twitter API, news from the news API and stores all relavant
   * information in the database.
   *
   */
  var tweetStream = new TweetStream()
  
  function intervalFunction () {
    console.log('interval')
    // At the beginning of each interval get all trends
    trends.getTrends()
    // Then update the trend info in the database
    .then(trends => {
      mainUtils.update(trends, tweetStream)
  
      tweetStream.closeStream()
  
      tweetStream.startTracking(trends.map(trendData => { return trendData.name }))
    })
  }
  
new_contents: 'use strict'
  const mongoose = require('mongoose')
  const api = require('./api')
  const trends = require('./twitter/trends')
  const config = require('./config')
  const mainUtils = require('./utils/main-utils')
  const TweetStream = require('./twitter/tweet-stream')
  
  mongoose.Promise = global.Promise
  
  // Connect to the db, then set up the intervalFunction
  var db = mongoose.connection
  db.on('error', console.error)
  db.once('open', () => {
    console.log('Successfully connected to mongodb')
  
    // Run the intervalFunction when the backend starts
    intervalFunction()
  
    // Then set up intervalFunction to run each server interval
    setInterval(intervalFunction, config.intervalLength * 1000)
  
    api.start()
  })
  mongoose.connect('mongodb://' + config.dbAddress + '/' + config.dbName)
  
  /**
   * Function run once every server interval, gets trends from the
   * Twitter API, news from the news API and stores all relavant
   * information in the database.
   *
   */
  var tweetStream = new TweetStream()
  
  function intervalFunction () {
    // At the beginning of each interval get all trends
    trends.getTrends()
    // Then update the trend info in the database
    .then(trends => {
      mainUtils.update(trends, tweetStream)
  
      tweetStream.closeStream()
  
      tweetStream.startTracking(trends.map(trendData => { return trendData.name }))
    })
  }
  
subject: Remove console.log call for debugging