- From: Boris Zbarsky <bzbarsky@mit.edu>
- Date: Tue, 02 Dec 2014 07:36:18 -0800
- To: Andreas Rossberg <rossberg@google.com>, "Mark S. Miller" <erights@google.com>
- CC: "public-script-coord@w3.org" <public-script-coord@w3.org>, es-discuss <es-discuss@mozilla.org>
On 12/2/14, 4:59 AM, Andreas Rossberg wrote: > On 1 December 2014 at 03:12, Mark S. Miller <erights@google.com> wrote: >> On Sun, Nov 30, 2014 at 12:21 PM, Boris Zbarsky <bzbarsky@mit.edu> wrote: >>> Per spec ES6, it seems to me like attempting to define a non-configurable >>> property on a WindowProxy should throw and getting a property descriptor for >>> a non-configurable property that got defined on the Window (e.g. via "var") >>> should report it as configurable. > > Can you clarify? Do you mean that it should report properties as > configurable, but still reject attempts to actually reconfigure them? Yes, correct. > Also, how would you allow 'var' to even define non-configurable > properties? Because "var" operates on the global directly. The global is a Window, not a WindowProxy and has no magic behavior. > If you want DefineProperty to throw on any such attempt, > then 'var' semantics would somehow have to bypass the MOP. The idea is that WindowProxy's [[DefineOwnProperty]] would throw as needed. Window's [[DefineOwnProperty]] is just http://people.mozilla.org/~jorendorff/es6-draft.html#sec-ordinarydefineownproperty -Boris
Received on Tuesday, 2 December 2014 15:36:51 UTC