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

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Convert an ArrayBuffer to an array of numbers

To retrieve the contents of an ArrayBuffer as an array of numbers, create a Uint8Array over of the buffer. and use the Array.from() method to convert it to an array.

const buf = new ArrayBuffer(64);
const arr = new Uint8Array(buf);
arr.length; // 64
arr[0]; // 0 (instantiated with all zeros)

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The Uint8Array class supports array indexing and iteration. However if you wish to convert the instance to a regular Array, use Array.from(). (This will likely be slower than using the Uint8Array directly.)

const buf = new ArrayBuffer(64);
const uintArr = new Uint8Array(buf);
const regularArr = Array.from(uintArr);
// number[]

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