bun.sh/docs/guides/streams/node-readable-to-arraybuffer.md

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Convert a Node.js Readable to an ArrayBuffer

To convert a Node.js Readable stream to an ArrayBuffer in Bun, you can create a new Response object with the stream as the body, then use arrayBuffer() to read the stream into an ArrayBuffer.

import { Readable } from "stream";
const stream = Readable.from(["Hello, ", "world!"]);
const buf = await new Response(stream).arrayBuffer();