// Return undefined if the trap returns undefined | |
var target = {}; | |
Object.defineProperty(target, 'foo', { | |
configurable: true | |
}); | |
var handler = { getOwnPropertyDescriptor: () => undefined }; | |
for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy]) | |
assertEq(Object.getOwnPropertyDescriptor(p, 'foo'), undefined); |