Object.getOwnPropertyDescriptors(O) ? // plural
C. Scott Ananian
ecmascript at cscott.net
Thu Mar 6 11:24:07 PST 2014
If you use a getOwnPropertyNames trap, then you also need a
getOwnPropertySymbols trap to implement getOwnPropertyDescriptors.
On Thu, Mar 6, 2014 at 2:16 AM, Tom Van Cutsem <tomvc.be at gmail.com> wrote:
> 2014-03-05 20:11 GMT+01:00 C. Scott Ananian <ecmascript at cscott.net>:
>> On Wed, Mar 5, 2014 at 1:39 PM, Tom Van Cutsem <tomvc.be at gmail.com> wrote:
>> > Object.getOwnPropertyDescriptors(proxy) would trigger the
>> > getOwnPropertyNames trap, followed by calls to the
>> > getOwnPropertyDescriptor
>> > trap for each individual property.
>> [[OwnPropertyKeys]], `ownKeys` trap.
> Yes, according to the current draft spec. I have a pending discussion with
> Allen that we actually need to reintroduce a [[GetOwnPropertyNames]]
> internal method / getOwnPropertyNames trap, as the `ownKeys` trap doesn't do
> any invariant checking, which is needed for a reliable Object.isFrozen test.
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