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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
You can check
process.env.CONSOLE=="USB"- this will detect if Espruino has a connection to your PC (eg. it appears as a COM port).However it has no way to know if you have an application running on the PC that is looking at what it is printing!