const weakMap = new WeakMap();
const gen = (function* () {
yield { key: 'value1' };
yield { key: 'value2' };
})();
const obj1 = gen.next().value;
const obj2 = gen.next().value;
weakMap.set(obj1, 'stored value1');
weakMap.set(obj2, 'stored value2');
const result = [...gen].map(obj => weakMap.get(obj));
console.log(result);
Ответ: []
JavaScript test | #JavaScript