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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
This is solved in post you mentioned now I believe: http://forum.espruino.com/conversations/368060/
It's a known problem with neopixels on older nRF52840 firmware, and not related to the web IDE or official boards. It's just that the board itself locked up after executing the command, but before it was able to 'echo' the full command back