| // Cull non-existent names returned by the trap. |
| var nullProtoAB = Object.create(null, { |
| a: { |
| enumerable: true, |
| configurable: true |
| }, |
| b: { |
| enumerable: false, |
| configurable: true |
| } |
| }); |
| var protoABWithCD = Object.create(nullProtoAB, { |
| c: { |
| enumerable: true, |
| configurable: true |
| }, |
| d: { |
| enumerable: false, |
| configurable: true |
| } |
| }); |
| |
| var returnedNames; |
| var handler = { ownKeys: () => returnedNames }; |
| |
| for (let p of [new Proxy(protoABWithCD, handler), Proxy.revocable(protoABWithCD, handler).proxy]) { |
| returnedNames = [ 'e' ]; |
| var names = Object.keys(p); |
| assertEq(names.length, 0); |
| |
| returnedNames = [ 'c' ]; |
| names = Object.keys(p); |
| assertEq(names.length, 1); |
| assertEq(names[0], 'c'); |
| } |