Fix static tests

Author: Mateusz Krzeszowiak

app/code/Magento/Theme/view/base/requirejs-config.js

@@ -60,10 +60,11 @@ var config = {
     }
 };
 
+/* eslint-disable max-depth */
 /**
  * Adds polyfills only for browser contexts which prevents bundlers from including them.
  */
-if (typeof window !== "undefined" && window.document) {
+if (typeof window !== 'undefined' && window.document) {
     /**
      * Polyfill localStorage and sessionStorage for browsers that do not support them.
      */
@@ -78,6 +79,7 @@ if (typeof window !== "undefined" && window.document) {
         config.deps.push('mage/polyfill');
     }
 }
+/* eslint-enable max-depth */
 
 require(['jquery'], function ($) {
     'use strict';

lib/web/mage/polyfill.js

@@ -1,5 +1,8 @@
 (function (root, doc) {
     'use strict';
+
+    var Storage;
+
     try {
         if (!root.localStorage || !root.sessionStorage) {
             throw new Error();
@@ -12,7 +15,7 @@
          * Returns a storage object to shim local or sessionStorage
          * @param {String} type - either 'local' or 'session'
          */
-        var Storage = function (type) {
+        Storage = function (type) {
             var data;
 
             /**