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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 don't think so - it's mostly FUD. As I've said before, Espruino is 5v tolerant for inputs, and most logic inputs of shields will still accept 3.3v inputs.
If you really wanted you could add pads for SMD pullup resistors (that pull up to 5v) as then you can stick Espruino into Open Drain mode and get a full 5v swing... however folks could just solder resistors onto the back of the board for the few pins where that may be required.