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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
With the old IDE? That makes sense, because I fixed something a month or so ago that could cause hanging.
IMO you're better off starting from scratch - update the IDE, update your Pico's firmware to cutting edge - and see what happens then. It'll make your life way easier.