Stack Trace?

test.js

var fs = require('fs');

function foo(callback) {
  fs.stat('foo', callback);
}

function bar(callback) {
  foo(callback);
}

process.nextTick(function() {
  bar(function(err) {
    delete err.stack;
    Error.captureStackTrace(err, arguments.callee);
    console.log(err.stack);
  });
});