bun.sh/docs/guides/binary/buffer-to-arraybuffer.md

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Convert a Buffer to an ArrayBuffer

The Node.js Buffer class provides a way to view and manipulate data in an underlying ArrayBuffer, which is available via the buffer property.

const nodeBuf = Buffer.alloc(64);
const arrBuf = nodeBuf.buffer;

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See Docs > API > Binary Data for complete documentation on manipulating binary data with Bun.