Reformat storage polyfill for better minification

Author: Mateusz Krzeszowiak

lib/web/mage/polyfill.js

@@ -1,14 +1,13 @@
-try {
-    if (!window.localStorage || !window.sessionStorage) {
-        throw new Error();
-    }
-
-    localStorage.setItem('storage_test', 1);
-    localStorage.removeItem('storage_test');
-} catch (e) {
-    (function () {
-        'use strict';
-
+(function (root, doc) {
+    'use strict';
+    try {
+        if (!root.localStorage || !root.sessionStorage) {
+            throw new Error();
+        }
+
+        localStorage.setItem('storage_test', 1);
+        localStorage.removeItem('storage_test');
+    } catch (e) {
         /**
          * Returns a storage object to shim local or sessionStorage
          * @param {String} type - either 'local' or 'session'
@@ -32,7 +31,7 @@ try {
                 } else {
                     expires = '';
                 }
-                document.cookie = name + '=' + value + expires + '; path=/';
+                doc.cookie = name + '=' + value + expires + '; path=/';
             }
 
             /**
@@ -41,7 +40,7 @@ try {
              */
             function readCookie(name) {
                 var nameEQ = name + '=',
-                    ca = document.cookie.split(';'),
+                    ca = doc.cookie.split(';'),
                     i = 0,
                     c;
 
@@ -70,11 +69,11 @@ try {
                     return 'localstorage';
                 }
 
-                if (!window.name) {
-                    window.name = new Date().getTime();
+                if (!root.name) {
+                    root.name = new Date().getTime();
                 }
 
-                return 'sessionStorage' + window.name;
+                return 'sessionStorage' + root.name;
             }
 
             /**
@@ -170,7 +169,7 @@ try {
             };
         };
 
-        window.localStorage.prototype = window.localStorage = new Storage('local');
-        window.sessionStorage.prototype = window.sessionStorage = new Storage('session');
-    })();
-}
+        root.localStorage.prototype = root.localStorage = new Storage('local');
+        root.sessionStorage.prototype = root.sessionStorage = new Storage('session');
+    }
+})(window, document);