Modifying the global state

app.js

var file1 = require('./file1')
var file2 = require('./file2')

file1.js

var request = require('request')

setTimeout(function () {
  request.on('error', function (err) {
    console.log('file1 call1 global on', err)
  }).get('badurl')
}, 500)

setTimeout(function () {
  request.on('error', function (err) {
    console.log('file1 call2 global on', err)
  }).get('badurl')
}, 3000)

file2.js

var request = require('request')

setTimeout(function () {
  request.get('badurl')
}, 1000)

setTimeout(function () {
  request.get('badurl').on('error', function (err) {
    console.log('file2 call2 ... on', err)
  })
}, 1000)

setTimeout(function () {
  request.on('error', function (err) {
    console.log('file2 call2 global on', err)
  }).get('badurl')
}, 2000)