To redirect a root domain to a www. subdomain in Deno Deploy, you can modify your application to include a redirect logic. Here is an example of how to do this:

> ```typescript
> addEventListener("fetch", (event) => {
>  
> event.respondWith(handleRequest(event.r> equest));
> });
> 
> async function handleRequest(request: > Request) {
> const url = new URL(request.url);
>
> // Check if the domain is the root
>  if (url.hostname === "example.com") {
>    // Redirect to www. subdomain
>    url.hostname = "www.example.com";
>    return Response.redirect(url.toString(), > 301);
>  }
>
>  // Continue with handling the request
>  // ...
> }
> ```

In the example code above, we use the `addEventListener` function to listen for incoming requests. The `handleRequest` function checks if the requested domain is the root domain "example.com". If yes, it redirects the request to the www. subdomain. The `Response.redirect` method is used with a 301 status code to indicate that the redirect is permanent. This will also ensure that search engines will update their index to point to the www. subdomain.

You can deploy this code to Deno Deploy and set up your custom domain to point to your deployed application URL. This will ensure that all requests to the root domain will be redirected to the www. subdomain.
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