const ws = new WeakSet();
const obj1 = { id: 1 };
const obj2 = { id: 2 };

ws.add(obj1);
ws.add(obj2);
ws.delete(obj1);

const obj3 = { id: 2 };

console.log([
  ws.has(obj2),
  ws.has(obj1),
  ws.has(obj3),
  ws.has({ id: 2 })
]);