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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.
@Ollie
See this closed issue which implies better compression is on the way. There may be more to it, but it's certainly on the radar.
https://github.com/espruino/Espruino/issues/773
For now if you connect via Wifi using the Web IDE you'll get the full error message. Depending on how far off you are you may be able to make some optimisations to your code which may help.