Move localstorage polyfill declaration to frontend

Author: ihor-sviziev

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

@@ -49,3 +49,24 @@ var config = {
         }
     }
 };
+
+/* eslint-disable max-depth */
+/**
+ * Adds polyfills only for browser contexts which prevents bundlers from including them.
+ */
+if (typeof window !== 'undefined' && window.document) {
+    /**
+     * Polyfill localStorage and sessionStorage for browsers that do not support them.
+     */
+    try {
+        if (!window.localStorage || !window.sessionStorage) {
+            throw new Error();
+        }
+
+        localStorage.setItem('storage_test', 1);
+        localStorage.removeItem('storage_test');
+    } catch (e) {
+        config.deps.push('mage/polyfill');
+    }
+}
+/* eslint-enable max-depth */