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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.
@Ollie
I think this is related to module size. What build are you using on ESP8266?
When the ESP8266 port started we had 1300 JSVars. We had to cut down the MQTT module to bare basics to get it to load and leave some space for application code.
But there are now some ESP8266 builds out there with 1600 (even 1700 JSVars) and I do wonder if the core module would run in this - I haven't had opportunity to test.
Maybe seek out one of the latest builds - with 1600/1700 JSVars, and try again or try this cut down MQTT module which has worked very well for myself and a couple of others.
https://github.com/olliephillips/tinyMQTT