Unfortunately there isn't anything at the moment - however if you want to use Arduino shields then you might find that something like this (along with a small breadboard) is very helpful: https://www.adafruit.com/products/2077
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.
Unfortunately there isn't anything at the moment - however if you want to use Arduino shields then you might find that something like this (along with a small breadboard) is very helpful: https://www.adafruit.com/products/2077
There are lots of similar things available - for instance many Arduino Starter kits come with them: http://www.ebay.co.uk/itm/252448757215