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src/lib/local-storage.js

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+// Helper functions for storing values in localStorage.
+// By default localStorage can store only strings, not objects or other types.
+
+export default class LocalStorageUtil {
+  // Replace old object with the new one.
+  static setObject(key, value) {
+    localStorage.setItem(key, JSON.stringify(value));
+  }
+
+  // Get stored object.
+  static getObject(key) {
+    let value = localStorage.getItem(key);
+    return value && JSON.parse(value);
+  }
+
+  // Partially or wholly update stored object.
+  static updateObject(key, value) {
+    let oldVal = localStorage.getObject(key);
+    localStorage.setObject(key, Object.assign(oldVal || {}, value));
+  }
+}