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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
Ahh, right! I've never heard of anyone doing that before!
What happens when you click 'upload' via storage is it just copies the file without any processing.
When you update from the right hand side it does quite a few transformations (including loading modules).
What I'd suggest is (and I think this'll work on Chromebook), the recent IDEs on https://www.espruino.com/ide/ should have a drop-down next to 'open' - click that and do 'Watch and Upload'. Now you can edit in Emacs and every time you save it'll re-upload