You're using an old version of the Espruino firmware with a new version of the Espruino Web IDE.
Try https://espruino-nightly.noda.se/
@Gordon started
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.
You're using an old version of the Espruino firmware with a new version of the Espruino Web IDE.
Try https://espruino-nightly.noda.se/