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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
I forget what's needed - you'd have to look at the WS2812 datasheet.
It might be that the last bit of the data that is sent on SPI is enough to set the resting state of the line. However if it isn't then I'm afraid you're out of luck