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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
They're in there already - for instance try: https://www.espruino.com/ide/emulator.html?code=for%20(i=0;i%3C240;i+=10)g.drawLineAA(0,i,240-i,0);&upload
I think the emulator may be missing a few rendering tweaks, but on the whole it's all available.