Debugging with async stack traces in Node.js

The commit d37d0fff, which fixed #542, modified Bluebird to detect when it’s running in a Chrome/Blink DevTools debugger and use a different queueing mechanism that plays well with DevTools “async stack traces” feature.

AFAICT, this does not work in DevTools provided by Node.js built-in debugger (node --inspect):

• bluebird@3.5.0
• node@6.10.1 (but also 8.0.0-pre compiled locally from nodejs/node@e1d4f0ed)

It would be great to modify Bluebird to support async stack traces in Node.js too. I think this will most likely require changes in Node.js too - AFAICT, right now there is no way how to detect whether a debugger is running or not.

A sample app I am using to reproduce the problem.

'use strict';

const Promise = require('bluebird');

setInterval(tick, 500);

function tick() {
  tickAsync().then(
    success => console.log('PASS', success),
    error => console.log('FAIL', error)
  );
}

function tickAsync() {
  return first().then(second).then(() => {
    debugger;
    return 'ok';
  });
}

function first() {
  return delay(10).then(() => {
    console.log('first done');
  });
}

function second() {
  return delay(10).then(() => {
    console.log('second done');
  });
}

function delay(ms) {
  // originally, I used setTimeout(resolve, ms)
  // but it looks like setTimeout is breaking 
  // V8's async-stack-trace detection :(
  return new Promise(resolve => resolve());
}

Async stack trace when using bluebird:

Async stack trace when I comment-out const Promise = require('bluebird'):

[bajtos]

Need help how to solve this : (node:740) [INSPECTOR_ASYNC_STACK_TRACES_NOT_AVAILABLE] Warning: Warning: Async stack traces in debugger are not available on 32bit platforms. The feature is disabled.

This is off-topic here.

Async stack traces are no supported on 32bit platforms because of a limitation of V8 inspector/debugger. See the discussion in https://github.com/nodejs/node/pull/13870, especially the following threads: https://github.com/nodejs/node/pull/13870#discussion_r124930411, https://github.com/nodejs/node/pull/13870#discussion_r127086782, https://github.com/nodejs/node/pull/13870#issuecomment-315126472.

https://github.com/nodejs/node is the place where to discuss this issue further.

[Serha31]

Need help how to solve this : (node:740) [INSPECTOR_ASYNC_STACK_TRACES_NOT_AVAILABLE] Warning: Warning: Async stack traces in debugger are not available on 32bit platforms. The feature is disabled.