h is not defined

I have a project that works locally, but when it's deployed the logs show `h is not defined`.

Here's the repo:

https://github.com/goodoldneon/deno-demo

In Deno Deploy's logs I'm seeing:

```
ReferenceError: h is not defined
at Server.handler (file:///src/src/index.tsx:8:18)
at Server.#respond (https://deno.land/std@0.140.0/http/server.ts:220:43)
at Server.#serveHttp (https://deno.land/std@0.140.0/http/server.ts:254:26)
```

Does Deno Deploy only support SSR React via `nano_jsx` and the `/** @jsx h */` pragma?