[Node][Unit34] Putting string variable in configuration.js

app.js

const Emitter = require('events')
const eventsConfig = require('./config').events


let emtr = new Emitter()

emtr.on(eventsConfig.GREET, function () {
  console.log('Somewhere, someone said hello')
})

emtr.on(eventsConfig.GREET, function () {
  console.log('A greeting occurred')
})

console.log('Hello')
emtr.emit(eventsConfig.GREET)

config.js

module.exports = {
  events: {
    GREET: 'greet',
    SAVE_FILE: 'saveFile'
  }
}