Index: node_modules/are-we-there-yet/lib/tracker-stream.js
===================================================================
--- node_modules/are-we-there-yet/lib/tracker-stream.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/are-we-there-yet/lib/tracker-stream.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,36 @@
+'use strict'
+var util = require('util')
+var stream = require('readable-stream')
+var delegate = require('delegates')
+var Tracker = require('./tracker.js')
+
+var TrackerStream = module.exports = function (name, size, options) {
+  stream.Transform.call(this, options)
+  this.tracker = new Tracker(name, size)
+  this.name = name
+  this.id = this.tracker.id
+  this.tracker.on('change', delegateChange(this))
+}
+util.inherits(TrackerStream, stream.Transform)
+
+function delegateChange (trackerStream) {
+  return function (name, completion, tracker) {
+    trackerStream.emit('change', name, completion, trackerStream)
+  }
+}
+
+TrackerStream.prototype._transform = function (data, encoding, cb) {
+  this.tracker.completeWork(data.length ? data.length : 1)
+  this.push(data)
+  cb()
+}
+
+TrackerStream.prototype._flush = function (cb) {
+  this.tracker.finish()
+  cb()
+}
+
+delegate(TrackerStream.prototype, 'tracker')
+  .method('completed')
+  .method('addWork')
+  .method('finish')