javascript
Deno.serve(
  (request) =>
    new Response(
      ReadableStream.from(makeStream(request)).pipeThrough(
        new TextEncoderStream()
      )
    )
);
const wait = (n: number) => new Promise((resolve) => setTimeout(resolve, n));

async function* makeStream(request) {
  yield "Hello,";
  console.log("start wait ");
  await wait(5000);
  yield "world!";
}

 javascript
Deno.serve(
  (request) =>
    new Response(
      ReadableStream.from(makeStream(request)).pipeThrough(
        new TextEncoderStream()
      )
    )
);
const wait = (n: number) => new Promise((resolve) => setTimeout(resolve, n));

async function* makeStream(request) {
  yield "Hello,";
  console.log("start wait ");
  await wait(5000);
  yield "world!";
}