setTimeout big issue - Puck.js at 2.04

Thanks for stripping this down...

I just stripped it right back and there's no problem. It turns out the issue is how timers are handled when a timer is added within a timer callback.

Try this:

setInterval(function () {
  if (BTN1.read()) setTimeout(function(){},0);
}, 100);
setInterval(function() {
  digitalPulse(LED1,1,10);
}, 1000);

LED1 should flash every second. However if you press BTN1 it'll just stop!

I've filed an issue for this at https://github.com/espruino/Espruino/issues/1829 and I'll try and get it fixed ASAP.

However you could fix it as-is by removing your setTimeout(function () { .... }, 0) line - I'm not entirely sure about the reasoning for that anyway?