Ensure localStorage is not fired in the source window with IE9/10

.gitignore

@@ -0,0 +1 @@
+node_modules/

index.js

@@ -1,22 +1,31 @@
-var constants = require('redux-persist/constants')
-var keyPrefix = constants.keyPrefix
+var constants = require('redux-persist/constants');
+var keyPrefix = constants.keyPrefix;
 
-module.exports = function(persistor, config){
-  var config = config || {}
-  var blacklist = config.blacklist || false
-  var whitelist = config.whitelist || false
+module.exports = function(persistor, config) {
+  var newConfig = config || {};
+  var blacklist = newConfig.blacklist || false;
+  var whitelist = newConfig.whitelist || false;
+  var isFocused = (document.hasFocus) ? document.hasFocus() : true;
 
-  window.addEventListener('storage', handleStorageEvent, false)
+  window.addEventListener('focus', function () {
+    isFocused = true;
+  }, false);
 
-  function handleStorageEvent(e){
-    if(e.key.indexOf(keyPrefix) === 0){
-      var keyspace = e.key.substr(keyPrefix.length)
-      if(whitelist && whitelist.indexOf(keyspace) === -1){ return }
-      if(blacklist && blacklist.indexOf(keyspace) !== -1){ return }
-
-      persistor.rehydrate(keyspace, e.newValue, function(){
-        //@TODO handle errors?
-      })
+  window.addEventListener('blur', function () {
+    isFocused = false;
+  }, false);
+
+  window.addEventListener('storage', function (event) {
+    if (isFocused) return;
+
+    if (event.key.indexOf(keyPrefix) === 0) {
+      var keyspace = event.key.substr(keyPrefix.length);
+      if (whitelist && whitelist.indexOf(keyspace) === -1) { return; }
+      if (blacklist && blacklist.indexOf(keyspace) !== -1) { return; }
+      // rehydrate storage with the new value
+      persistor.rehydrate(keyspace, event.newValue, function (key, state) {
+        // @TODO handle errors?
+      });
     }
-  }
-}
+  }, false);
+};