luhn-generator/update/node_modules/os-homedir/index.js

A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

'use strict';
var os = require('os');

function homedir() {
	var env = process.env;
	var home = env.HOME;
	var user = env.LOGNAME || env.USER || env.LNAME || env.USERNAME;

	if (process.platform === 'win32') {
		return env.USERPROFILE || env.HOMEDRIVE + env.HOMEPATH || home || null;
	}

	if (process.platform === 'darwin') {
		return home || (user ? '/Users/' + user : null);
	}

	if (process.platform === 'linux') {
		return home || (process.getuid() === 0 ? '/root' : (user ? '/home/' + user : null));
	}

	return home || null;
}

module.exports = typeof os.homedir === 'function' ? os.homedir : homedir;