Migrated to typescript the most complex reducer in the project

src/short-urls/helpers/index.ts

@@ -1,6 +1,8 @@
 import { isNil } from 'ramda';
+import { ShortUrl } from '../data';
+import { OptionalString } from '../../utils/utils';
 
-export const shortUrlMatches = (shortUrl, shortCode, domain) => {
+export const shortUrlMatches = (shortUrl: ShortUrl, shortCode: string, domain: OptionalString): boolean => {
   if (isNil(domain)) {
     return shortUrl.shortCode === shortCode && !shortUrl.domain;
   }