Atomics.store()

// Create a SharedArrayBuffer with a size in bytes
const buffer = new SharedArrayBuffer(16);
const uint8 = new Uint8Array(buffer);
uint8[0] = 5;
console.log(Atomics.store(uint8, 0, 2));
// Expected output: 2
console.log(Atomics.load(uint8, 0));
// Expected output: 2

Atomics.store(typedArray, index, value)

const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);
Atomics.store(ta, 0, 12); // 12