old_contents: import express from 'express'
  import session from 'express-session'
  import path from 'path'
  import favicon from 'serve-favicon'
  import logger from 'morgan'
  import cookieParser from 'cookie-parser'
  import bodyParser from 'body-parser'
  import mongoose from 'mongoose'
  import passport from 'passport'
  import flash from 'connect-flash'
  
  /* Express setup */
  let app = express()
  
  // view engine setup
  app.set('views', path.join(__dirname, 'views'))
  app.set('view engine', 'ejs')
  app.set('api version', '1.0')
  
  app.use(favicon(path.join(__dirname, 'public/favicon.ico')))
  app.use(logger('short'))
  app.use(bodyParser.json())
  app.use(bodyParser.urlencoded({
    extended: false
  }))
  app.use(cookieParser())
  app.use(session({
    secret: 'pusheeeen',
    resave: false,
    saveUninitialized: false
  }))
  app.use(express.static(path.join(__dirname, 'public')))
  app.use(flash())
  app.use(passport.initialize())
  app.use(passport.session())
  
  // Initialize mongoose singleton
  if (!process.env.MONGO_URL) {
    throw new Error('Missing MONGO_URL environment variable')
  }
  mongoose.connect(process.env.MONGO_URL)
  
  /* Front end routes */
  import index from './routes/index'
  import docs from './routes/docs'
  app.use('/', index)
  app.use('/docs', docs)
  
  /* User routes */
  import user from 'user'
  app.use('/user', user)
  
  /* API routes */
  import uoftCourseApi from 'uoft-course-api'
  import uoftBuildingApi from 'uoft-building-api'
  import uoftFoodApi from 'uoft-food-api'
  app.use('/api/courses', uoftCourseApi)
  app.use('/api/buildings', uoftBuildingApi)
  app.use('/api/food', uoftFoodApi)
  
  
  /* Error handlers */
  
  // catch 404 and forward to error handler
  app.use(function(req, res, next) {
    let err = new Error('Not Found')
    err.status = 404
    next(err)
  })
  
  // 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({
        "error": {
          code: err.status,
          message: err.message
        }
      })
    })
  }
  
  // production error handler
  // no stacktraces leaked to user
  app.use(function(err, req, res, next) {
    res.status(err.status || 500)
    res.render('error', {
      message: err.message,
      error: {}
    })
  })
  
  
  module.exports = app
  
new_contents: import express from 'express'
  import session from 'express-session'
  import path from 'path'
  import favicon from 'serve-favicon'
  import logger from 'morgan'
  import cookieParser from 'cookie-parser'
  import bodyParser from 'body-parser'
  import mongoose from 'mongoose'
  import passport from 'passport'
  import flash from 'connect-flash'
  
  /* Express setup */
  let app = express()
  
  // view engine setup
  app.set('views', path.join(__dirname, 'views'))
  app.set('view engine', 'ejs')
  app.set('api version', '1.0')
  
  app.use(favicon(path.join(__dirname, 'public/favicon.ico')))
  app.use(logger('short'))
  app.use(bodyParser.json())
  app.use(bodyParser.urlencoded({
    extended: false
  }))
  app.use(cookieParser())
  app.use(session({
    secret: 'pusheeeen',
    resave: false,
    saveUninitialized: false
  }))
  app.use(express.static(path.join(__dirname, 'public')))
  app.use(flash())
  app.use(passport.initialize())
  app.use(passport.session())
  
  // Initialize mongoose singleton
  if (!process.env.MONGO_URL) {
    throw new Error('Missing MONGO_URL environment variable')
  }
  mongoose.connect(process.env.MONGO_URL)
  
  /* Front end routes */
  import index from './routes/index'
  import docs from './routes/docs'
  app.use('/', index)
  app.use('/docs', docs)
  
  /* User routes */
  import user from 'user'
  app.use('/user', user)
  
  /* API routes */
  import uoftCourseApi from 'uoft-course-api'
  import uoftBuildingApi from 'uoft-building-api'
  import uoftFoodApi from 'uoft-food-api'
  app.use('/api/courses', uoftCourseApi)
  app.use('/api/buildings', uoftBuildingApi)
  app.use('/api/food', uoftFoodApi)
  
  
  /* Error handlers */
  
  // catch 404 and forward to error handler
  app.use((req, res, next) => {
    let err = new Error('Not Found')
    err.status = 404
    next(err)
  })
  
  // development error handler
  // will print stacktrace
  if (app.get('env') === 'development') {
    app.use((err, req, res, next) => {
      res.status(err.status || 500)
      res.json({
        error: {
          code: err.status,
          message: err.message
        }
      })
    })
  }
  
  // production error handler
  // no stacktraces leaked to user
  app.use((err, req, res, next) => {
    res.status(err.status || 500)
    res.render('error', {
      message: err.message,
      error: {}
    })
  })
  
  export default app
  
subject: Use arrows & export default