// main.ts
export default {
  fetch() {
    return new Response("it works");
  },
};

error: Uncaught (in promise) TypeError: Invalid type for fetch: must be a function with a single parameter
    at registerDeclarativeServer (ext:deno_http/00_serve.ts:547:13)
    at ext:runtime_main/js/99_main.js:722:21