It seems to work well. It handles module loading off the espruino website, but if you have local modules it won't add them for you. If you can get something to bundle your code into one file (like browserify does), then use espruino-tools to send it across, you should be set.
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.
I think this is what you want: https://github.com/espruino/espruino-tools
It seems to work well. It handles module loading off the espruino website, but if you have local modules it won't add them for you. If you can get something to bundle your code into one file (like browserify does), then use espruino-tools to send it across, you should be set.