bun.sh/docs/guides/http/stream-node-streams-in-bun.md

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Streaming HTTP Server with Node.js Streams

In Bun, Response objects can accept a Node.js Readable.

This works because Bun's Response object allows any async iterable as its body. Node.js streams are async iterables, so you can pass them directly to Response.

import { Readable } from "stream";
import { serve } from "bun";
serve({
  port: 3000,
  fetch(req) {
    return new Response(Readable.from(["Hello, ", "world!"]), {
      headers: { "Content-Type": "text/plain" },
    });
  },
});