DataView.prototype.setBigUint64()

// ArrayBuffer 
const buffer = new ArrayBuffer(16);

//  64 
const max = 2n ** 64n - 1n;

const view = new DataView(buffer);
view.setBigUint64(1, max);

console.log(view.getBigUint64(1));
// : 18446744073709551615n

setBigUint64(byteOffset, value)
setBigUint64(byteOffset, value, littleEndian)

const buffer = new ArrayBuffer(10);
const dataview = new DataView(buffer);
dataview.setBigUint64(0, 3n);
dataview.getBigUint64(1); // 768n