1 files changed, 33 insertions, 21 deletions

diff --git a/node_modules/fast-deep-equal/index.js b/node_modules/fast-deep-equal/index.js
index a29572d71..27264f5b2 100644
--- a/node_modules/fast-deep-equal/index.js
+++ b/node_modules/fast-deep-equal/index.js
@@ -1,43 +1,55 @@
 'use strict';
 
+var isArray = Array.isArray;
+var keyList = Object.keys;
+var hasProp = Object.prototype.hasOwnProperty;
+
 module.exports = function equal(a, b) {
   if (a === b) return true;
 
-  var arrA = Array.isArray(a)
-    , arrB = Array.isArray(b)
-    , i;
+  if (a && b && typeof a == 'object' && typeof b == 'object') {
+    var arrA = isArray(a)
+      , arrB = isArray(b)
+      , i
+      , length
+      , key;
 
-  if (arrA && arrB) {
-    if (a.length != b.length) return false;
-    for (i = 0; i < a.length; i++)
-      if (!equal(a[i], b[i])) return false;
-    return true;
-  }
+    if (arrA && arrB) {
+      length = a.length;
+      if (length != b.length) return false;
+      for (i = length; i-- !== 0;)
+        if (!equal(a[i], b[i])) return false;
+      return true;
+    }
 
-  if (arrA != arrB) return false;
-
-  if (a && b && typeof a === 'object' && typeof b === 'object') {
-    var keys = Object.keys(a);
-    if (keys.length !== Object.keys(b).length) return false;
+    if (arrA != arrB) return false;
 
     var dateA = a instanceof Date
       , dateB = b instanceof Date;
-    if (dateA && dateB) return a.getTime() == b.getTime();
     if (dateA != dateB) return false;
+    if (dateA && dateB) return a.getTime() == b.getTime();
 
     var regexpA = a instanceof RegExp
       , regexpB = b instanceof RegExp;
-    if (regexpA && regexpB) return a.toString() == b.toString();
     if (regexpA != regexpB) return false;
+    if (regexpA && regexpB) return a.toString() == b.toString();
+
+    var keys = keyList(a);
+    length = keys.length;
+
+    if (length !== keyList(b).length)
+      return false;
 
-    for (i = 0; i < keys.length; i++)
-      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
+    for (i = length; i-- !== 0;)
+      if (!hasProp.call(b, keys[i])) return false;
 
-    for (i = 0; i < keys.length; i++)
-      if(!equal(a[keys[i]], b[keys[i]])) return false;
+    for (i = length; i-- !== 0;) {
+      key = keys[i];
+      if (!equal(a[key], b[key])) return false;
+    }
 
     return true;
   }
 
-  return false;
+  return a!==a && b!==b;
 };