bun.sh/docs/guides/streams/to-buffer.md

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Convert a ReadableStream to a Buffer

Bun provides a number of convenience functions for reading the contents of a ReadableStream into different formats. This snippet reads the contents of a ReadableStream to an ArrayBuffer, then creates a Buffer that points to it.

const stream = new ReadableStream();
const arrBuf = await Bun.readableStreamToArrayBuffer(stream);
const nodeBuf = Buffer.from(arrBuf);

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See Docs > API > Utils for documentation on Bun's other ReadableStream conversion functions.