fix: typing issue

index.html

@@ -6,7 +6,7 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>TODO List</title>
-  <script src="??????"></script>
+  <script src="??????" type="module"></script>
   <link rel="stylesheet" href="??????">
 </head>
 

index.js

 // @ts-check
 
+import { format } from 'https://esm.run/date-fns';
+
 /**
  * @param {Date} from
  * @param {Date} to

shim.d.ts

+declare module "https://esm.run/date-fns" {
+  export * from "date-fns";
+}