Add NKeyStorage class to retrieve and set keys in browser storage in a mostly-secure way

src/utils/storage.ts

@@ -0,0 +1,15 @@
+/** Lock a key from being accessed by `localStorage` and `sessionStorage`. */
+function lockStorageKey(key: string): void {
+  const proto = Object.getPrototypeOf(localStorage ?? sessionStorage);
+  const _getItem = proto.getItem;
+
+  proto.getItem = function(_key: string) {
+    if (_key === key) {
+      throw new Error(`${_key} is locked`);
+    } else {
+      return _getItem.bind(this)(_key);
+    }
+  };
+}
+
+export { lockStorageKey };