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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
I don't have time to help you out with that at the moment I'm afraid.
I guess worst case you could just execute
espruino -p /dev/cu.usbmodem1421 -w yourfileas a separate process