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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
Which file IO did you mean? https://www.espruino.com/Reference#File or https://www.espruino.com/Reference#Storage ?
I believe it's possible with Storage (even if not documented) but with File you'd just have to keep track yourself