Pycharm debug mode can't get returned value of moment().startOf('minute').toDate())?

Within console I can return from:

console.log('test current time is : ', moment().startOf('minute').toDate());
Wed May 11 2016 13:15:00 GMT+0100 (GMT Daylight Time)

But why while debugging in Pycharm (or any other IDE) when stepping over

console.log('test current time is : ', moment().startOf('minute').toDate());
// No values returned?