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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, I should add here that at least on nRF52-based boards the Neopixel support uses DMA so it's totally fine with doing stuff like taking serial data in at the same time.
What kind of hardware are you using?