bluebirdDomainLeak.js

#! /usr/bin/env node

var domain = require('domain');
var Promise = require('bluebird');

console.log('This is a demonstration of a bug in Bluebird when Domains are involved.');
console.log('If a then() throws an exception, the domain does not exit() and remains on the stack.');

function reportDomainDepth(state) {
    console.log(state + ', current domain depth is ' + domain._stack.length);
}

var promise;
var resolver;

domain.create().run(function() {
    reportDomainDepth('In domain.run()');

    promise = new Promise(function(resolve) {
        resolver = resolve;
    }).then(function() {
        reportDomainDepth('Prior to exception');

        throw new Error('Here is where the wheels come off');
    }).catch(function() {
        reportDomainDepth('In exception handler');
    });
});

reportDomainDepth('After domain exit');

resolver('asynchronous resolve()');

process.on('exit', function() {
    reportDomainDepth('At exit');
});