ADS1115 analog gain signal module - how to run it with espruino?

Try:

var ads = require("https://gist.githubusercontent.com/gfwilliams/da8f09f91c8d0011cbae/raw/51dcef9df30bafa7282fb0bea17cda1d637e488f/ADS1X15.js").connect(...)

Looks like there was a bit of a bug in the code.