[Feature Request] better cloudflare workers support (with streaming)

[Hebilicious]

Describe the feature

H3 works in cloudflare workers but is quite inconvenient to use, as it needs createCall from unenv #39

#144 sendStream / isStream seems incompatible with the TransformStream style used in cloudflare workers.

Proposed API :

Standard:

const workerStream = {
  fetch(request: Request, env?: any, context?: ExecutionContext) {
    const app = createApp({ debug: false });
    app.use(
      "/",
      eventHandler(async () => {
        return sendNativeResponse(new Response("Hello World"));
      })
    );
    return adapterCloudflareWorker(app, request, env, context);
  },
};

Streaming:

  const workerStream = {
    fetch(request: Request, env?: any, context?: ExecutionContext) {
    const app = createApp({ debug: false });
      app.use(
        "/",
        eventHandler(async () => {
          const response = await fetch(request);
          const { readable, writable } = new TransformStream();
          response.body?.pipeTo(writable);
          return sendNativeResponse(new Response(readable, response));
        })
      );
      return adapterCloudflareWorker(app, request, env, context);
    },
  };

Maybe we can wrap the entire app and allow returning responses without a helper :

const app = createApp({ debug: false })
const cloudflare = adapterCloudflareWorker(app);
app.use(
  "/",
  eventHandler(async () => {
    const response = await fetch(request);
    const { readable, writable } = new TransformStream();
    response.body?.pipeTo(writable);
    return new Response(readable, response);
  })
); 
export default cloudflare // module syntax
cloudflare.fire() // sw syntax 

This would unlock the possiblity for Nuxt to use pipeToWebWriteable to do HTML streaming on cloudflare workers.

Additional information

• Would you be willing to help implement this feature?

[pi0]

Let's track via #458. Cloudflare workers as well as other edge runtimes share the same Web API (Request/Response). We might, later on, add platform-specific instructions to the docs.