migrate to axios, front-end part of configurable ServerAddress

webUI/react/src/util/localStorage.tsx

@@ -0,0 +1,28 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+function getItem<T>(key: string, defaultValue: T) : T {
+    try {
+        const item = window.localStorage.getItem(key);
+
+        if (item !== null) {
+            return JSON.parse(item);
+        }
+
+        window.localStorage.setItem(key, JSON.stringify(defaultValue));
+
+        /* eslint-disable no-empty */
+    } finally { }
+    return defaultValue;
+}
+
+function setItem<T>(key: string, value: T): void {
+    try {
+        window.localStorage.setItem(key, JSON.stringify(value));
+
+        // eslint-disable-next-line no-empty
+    } finally { }
+}
+
+export default { getItem, setItem };