WeakSet.prototype.delete()

const weakset = new WeakSet();
const object = {};
weakset.add(object);
console.log(weakset.has(object));
// Expected output: true
weakset.delete(object);
console.log(weakset.has(object));
// Expected output: false

weakSetInstance.delete(value)

const ws = new WeakSet();
const obj = {};
ws.add(window);
ws.delete(obj); // Returns false. No obj found to be deleted.
ws.delete(window); // Returns true. Successfully removed.
ws.has(window); // Returns false. The window is no longer present in the WeakSet.