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

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Convert a ReadableStream to an ArrayBuffer

Bun provides a number of convenience functions for reading the contents of a ReadableStream into different formats.

const stream = new ReadableStream();
const buf = await Bun.readableStreamToArrayBuffer(stream);

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