List all files below a given path, recursing through subdirectories using node.js and the Async module

gistfile1.js

/**
 * List all files below a given path, recursing through subdirectories.
 *
 * @param {String} p
 * @param {Function} callback
 * @api public
 */

exports.descendants = function (p, callback) {
    fs.stat(p, function (err, stats) {
        if (err) {
            return callback(err);
        }
        if (stats.isDirectory()) {
            fs.readdir(p, function (err, files) {
                if (err) {
                    return callback(err);
                }
                var paths = files.map(function (f) {
                    return path.join(p, f);
                });
                async.concat(paths, exports.descendants, function (err, files) {
                    if (err) {
                        callback(err);
                    }
                    else {
                        callback(err, files);
                    }
                });
            });
        }
        else if (stats.isFile()) {
            callback(null, p);
        }
    });
};