Recursively, asynchronously read directories in Node.js

recursiveReaddir.js

// Calling reAsyncReaddir("file/path", callback) passes an object composed of 
// a "files" array and a "directories" array (=keys) to your callback.

var fs = require("fs");
var results = {
  "files" : [],
  "directories" : []
};
var counts = {
  "fsObjects" : 0,
  "readdir" :  0
};

var checkCount = function (callback) {
  if (!counts.fsObjects && !counts.readdir) {
    callback(results);
  }
};

var checkStat = function (path, callback) {
  fs.stat(path, function (err, stats) {
    if (stats.isDirectory()) {
      reAsyncReaddir(path, callback);
      results.directories.push(path);
    } else {
      results.files.push(path);
    }
    counts.fsObjects--;
    checkCount(callback);
  });
};

var reAsyncReaddir = function (path, callback) {
  var counter = 0;
  counts.readdir++;
  fs.readdir(path, function (err, data) {
    if (!err) {
      counts.fsObjects += data.length;
      while (counter < data.length) {
        checkStat(path + "/" + data[counter], callback);
        counter++;
        if (counter === data.length) {
          counts.readdir--;
        }
      }
    }
  });
};

// Example callback function.
var complete = function (results) {
  console.log(results);
};

// Don't include a trailing slash in the folder path.
reAsyncReaddir("example/folder/path", complete);