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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
The watch faces there look good - although I guess my concern with something with this is that at some point it may end up being complicated enough that it's more tricky than just writing the watch face directly in JS where there are code comments and you can look up what functions do...
Since you're doing a bunch of work on upload of the zip file, maybe rather than uploading images and JSON separately and decoding that in the app, why not use it to create the JS file for the app straight in the app loader? Then you can avoid the whole 'interpreting' step which I guess is causing you memory and speed problems right now