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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);
See Docs > API > Utils for documentation on Bun’s other ReadableStream conversion functions.