Can't figure out how to install modules please help

[1stRadiant]

I have tried to follow the big number example but I can't get it to work when i require() in my js code.
I used $npm install bignumber.js
This creates a node_modules folder in my root folder, but when i try to use var BigNumber = require("bignumber.js");

I get the following error:

E/JSEXCEPTION: Unhandled exception: Error: java.lang.reflect.InvocationTargetException
service.js:2
var BigNumber = require('bignumber.js')
^

[huy-lv]

this repo seems not maintain anymore