v1.87 is a good bet for ESP8266. AFAIK there hasn't been any ESP8266 specific development in the later versions. Earlier versions might not get you the 1700 jsVars which is where the ESP8266 port ended up.
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.
v1.87 is a good bet for ESP8266. AFAIK there hasn't been any ESP8266 specific development in the later versions. Earlier versions might not get you the 1700 jsVars which is where the ESP8266 port ended up.