What are the Web Streams API (ReadableStream/WritableStream) in Node.js and how do they differ from node:stream?

const res = await fetch('https://example.com/big');
// res.body is a Web ReadableStream — async-iterable:
for await (const chunk of res.body) {
  console.log('got', chunk.length, 'bytes');
}

// Bridge to node:stream if needed:
import { Readable } from 'node:stream';
const nodeStream = Readable.fromWeb(res.body);