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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
Realistically probably doing what @JumJum has done and adding a LED object with write/etc commands to the firmware would be a good bet.
... however I have just changed the emulator to give a more interesting bit of start code when using Bangle.js :)