while loop reboots

To count pulses with an mc, usually you connect an internal counter's clock (or timer) to an input pin by timer/counter/gpio configuration. The timer/counter is then configurable in regard of where to start/how much to count, what to do on over or underrun, such as restart, stop, send interrupts, etc. I'm though not aware of any Espruino setup that makes such a basic mc function work. May be @Gordon may shed some light on that or make it even happen with for example a pin mode... ;-)