On Wed, Dec 12, 2012 at 3:44 PM, David Bruant <bruan...@gmail.com> wrote:
> Le 12/12/2012 22:30, Kevin Reid a écrit : > > The JS runtime won't know that the proxy has anything to do with the > actual Window instance. The Proxy's formal target will be just {}; > > This target, even if dummy, is the one that will be used for invariants > checks. You can't get away from this by design. This is one of the most > important part of the direct proxies design. > Even if you switch of fake target, the engine will still perform checks on > the dummy internal [[Target]]. > > I feel we're cycling in what we say and I feel I can't find the right > words to explain my point. One idea would be for you to implement a > target-switching proxy based on direct proxies (Firefox has them natively > or you can use Tom's shim [1]). I'm confident you'll understand my point > through this exercise. > David: https://gist.github.com/4279162 I think this is what Kevin has in mind. Note in particular that the target of the Proxy is just a dummy object, and the handler ignores it entirely. The proxy uses it for invariant checks, but the intent is that those would always pass. -j
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