index.js

'use strict';

var i = 0;
console.log('starting app');
setInterval(function() {
  i++;
  console.log('simulate activity');
  if (i > 5) {
    doesNotExist = 0; // this will throw ReferenceError: doesNotExist is not defined
  }
}, 1000);

package.json

{
  "main": "index.js",
  "devDependencies": {
    "nodemon": "^1.8.1"
  }
}