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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
Yes, with 'save to flash' turned on, it's about 40kB.
Without it really depends on what you're uploading as the code is executed and the results put into RAM, and then when you save that to flash it's compressed.
Remember you can also turn on minification, and if not doing 'save to flash' you can also turn on 'pretokenisation' with
E.setFlags({pretokenise:1}).