WeakSet.prototype.delete()

const weakset1 = new WeakSet();
const object1 = {};

weakset1.add(object1);

console.log(weakset1.has(object1));
// Expected output: true

weakset1.delete(object1);

console.log(weakset1.has(object1));
// Expected output: false

weakSetInstance.delete(value)

const ws = new WeakSet();
const obj = {};

ws.add(window);

ws.delete(obj); // false  .    
ws.delete(window); // true  .  .

ws.has(window); // false  . window     WeakSet  .