cleanup.js

// Object to capture process exits and call app specific cleanup function
var debug = require('debug')('Cleanup');

function noOp() {};

exports.Cleanup = function Cleanup(callback) {

    // attach user callback to the process event emitter
    // if no callback, it will still exit gracefully on Ctrl-C
    callback = callback || noOp;
    process.on('cleanup', callback);

    // do app specific cleaning before exiting
    process.on('exit', function () {
        process.emit('cleanup');
    });

    // catch ctrl+c event and exit normally
    process.on('SIGINT', function () {
        debug('Ctrl-C...');
        process.exit(2);
    });

    //catch uncaught exceptions, trace, then exit normally
    process.on('uncaughtException', function (e) {
        debug('Uncaught Exception...', e.stack);
        process.exit(99);
    });
};