tree.js

module.exports = tree
tree.sync = treeSync

var fs = require("fs")
  , path = require("path")

function tree (root, cb) {
  fs.lstat(root, function (er, s) {
    if (er) return cb(er)
    s.name = root
    // if it's a dir, then get the list of children.
    if (!s.isDirectory()) return cb(null, s)
    fs.readdir(root, function (er, children) {
      if (er) return cb(er)
      s.children = []
      var childrenWaiting = children.length
        , index = 0
        , error = null
      children.forEach(function (child) {
        var i = index ++
        if (error) return
        tree(path.join(root, child), function (er, t) {
          if (error) return
          if (er) return cb(error = er)
          t.name = child
          t.path = path.join(root, child)
          s.children[i] = t
          if (--childrenWaiting === 0) cb(null, s)
        })
      })
    })
  })
}

function treeSync (root) {
  var s = fs.lstatSync(root)
  s.name = root
  if (!s.isDirectory()) return s
  var children = fs.readdirSync(root)
  s.children = []
  for (var i = 0, l = children.length; i < l; i ++) {
    var child = treeSync(path.join(root, children[i]))
    child.name = children[i]
    child.path = path.join(root, children[i])
    s.children.push(child)
  }
  return s
}

if (module !== process.mainModule) return

tree("/Users", function (er, ok) {
  console.error((er && er.stack) || ok)
})