How to reference node modules in AngularJs file

Question

I'm using the money.js and accounting.js libraries. I used npm install to get them in package.json and am referencing them in my JS file like:

var fx = require("money");
var accounting = require("accounting");

however the functions included in the library are not recognized, and angular cannot load - so I think I must be doing this incorrectly.

This is how it's being used:

var fx = require("money");
var accounting = require("accounting");

const USD = "USD";
const GBP = "GBP";
const EUR = "EUR";

fx.base = USD;
var response = $http.get("http://api.fixer.io/latest");
response.then(function(response){
    fx.rates = response.data.rates;
}, function(error){
    //handle error
});

...

    $scope.getTotalGBP = () => {
        var price = $scope.getTotalPrice();

        var priceGBP = fx.convert(price).from(USD).to(GBP);
        var formatted = accounting.formatMoney(priceGBP, [symbol = "£"], [precision = 2], [thousand = ","], [decimal = "."], [format = "%s%v"]);

        return formatted;
    };