Development is in progress. There is currently no working support for this module on any boards, on any version of Espruino.
I'm afraid the ESP8266 support needs to be 'compiled in' right now, and even after that it isn't in a very usable state. Hopefully it will be in around a month though.
In the mean time, @JumJum has some code that does work with the ESP8266 - just not the full HTTP client/server. link here
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.
edit: beaten to it!
The ESP8266 site does say:
I'm afraid the ESP8266 support needs to be 'compiled in' right now, and even after that it isn't in a very usable state. Hopefully it will be in around a month though.
In the mean time, @JumJum has some code that does work with the ESP8266 - just not the full HTTP client/server. link here