Migrated to typescript the most complex reducer in the project

src/short-urls/data/index.ts

@@ -1,4 +1,4 @@
-import { Nullable } from '../../utils/utils';
+import { Nullable, OptionalString } from '../../utils/utils';
 
 export interface ShortUrlData {
   longUrl: string;
@@ -33,3 +33,8 @@ export interface ShortUrlModalProps {
   isOpen: boolean;
   toggle: () => void;
 }
+
+export interface ShortUrlIdentifier {
+  shortCode: string;
+  domain: OptionalString;
+}