simple basic-auth node github api

github.js

// Simple Use:
// ----------
// github('/user/repos', callback);
// github('/repos/:user/:repo/issues', { user: user, repo: repo }, callback);

var request     = require('request');
var querystring = require('querystring');

var github = function (path, options, callback) {
    var username = 'username';
    var password = '********';
    var tokens   = path.match(/:[^\/]+/g);
    var method   = options.method || 'get';

    if (typeof options == 'function') {
        callback = options;
        options  = {};
    }

    delete options.method;

    tokens && tokens.forEach(function (token) {
        var key = token.substr(1);
        path = path.replace(token, options[key]);
        delete options[key];
    });

    if (Object.keys(options).length) path += '?' + querystring.stringify(options);

    request({ 
        url: 'https://api.github.com' + path, 
        json:true,
        headers: { 
            'Host': 'api.github.com', 
            'Authorization': 'Basic ' + new Buffer(username + ':' + password).toString('base64') 
        }
    }, function (err, response, body) { callback(err, body); });
}

git.js:6 Uncaught ReferenceError: require is not defined at... How to handle this?