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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.
@Ollie
Mine run from Mac USB power. These and the NodeMCU have always been pretty reliable on USB power. Only when I've been using the 01 and 12 directly have I needed to use a capacitor and maybe supply power from a source other than the USB FTDI adapter. Are yours genuine D1s? You don't think you could have got a bad batch? The quality varies with the cheap boards and I've bought ESP8266 boards that don't do what they should before now (Wifi Node-M).