I would grab the unified version from cdn and put it in the espruino ide and see what happens. Usual approach is to fetch the library as a single javascript file and save a copy in the bangle repo, e.g. see suncalc.js
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 would grab the unified version from cdn and put it in the espruino ide and see what happens. Usual approach is to fetch the library as a single javascript file and save a copy in the bangle repo, e.g. see suncalc.js