Also https://github.com/espruino/Espruino/blob/master/README_Building.md - if you have Linux set up (even the built-in 'Bash on Windows') it's just:
git clone https://github.com/espruino/Espruino cd Espruino source scripts/provision.sh PIXLJS BOARD=PIXLJS DFU_UPDATE_BUILD=1 RELEASE=1 make
@Gordon started
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.
Also https://github.com/espruino/Espruino/blob/master/README_Building.md - if you have Linux set up (even the built-in 'Bash on Windows') it's just: