async error inside a promise

server.js

'use strict';

require('es6-promise').polyfill();

var domain      = require('domain');
var express     = require('express');
var app         = express();

app.get('/', function (req, res) {
    res.send('ok')
})

// kill the process
app.get('/error', function (req, res) {

    var a = new Promise(function(resolve, reject) { 
        setTimeout(function() {
            throw new Error('Asynchronous error from timeout');
        }, 500);
    });

    a
        .then(function () {
            res.send('ok from error')
        })
        .catch(function () {
            res.send('not ok from error')
        })

})

// doesn't kill the process
app.get('/error-w-domain', function (req, res) {

    var d = domain.create();
    
    d.on('error', function(err) {
        console.log(err.stack);
        res.send('error')
    });
    
    d.run(function() {

        var a = new Promise(function(resolve, reject) { 
            setTimeout(function() {
                throw new Error('Asynchronous error from timeout');
            }, 500);
        });

        a
            .then(function () {
                res.send('ok from error')
            })
            .catch(function () {
                res.send('not ok from error')
            })
    });

})

var port = Number(process.env.PORT || 5003);
var server = app.listen(port);