info
Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
Intent to implement: disallowing definition of non-configurable properties on a window
20 views
Skip to first unread message
Boris Zbarsky
Jul 23, 2015, 11:57:21 AM7/23/15
to
A bit belated, since I just landed this on inbound, but...
Summary: In ES2015, there is a certain set of invariants that an object
is supposed to maintain. One of those is that a non-configurable
property can't just disappear. Window objects obviously can't maintain
that invariant, so they can't be allowed to have non-configurable
properties, at least in terms of observability from script.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1107443
Standard:
http://www.ecma-international.org/ecma-262/6.0/#sec-invariants-of-the-essential-internal-methods
Platforms: all
Estimated release date: Unclear so far; need to see how web-compatible
this is.
Preference controlling this: no preference, but a !RELEASE_BUILD ifdef.
So this will be enabled in nightly and Aurora only.
-Boris
Summary: In ES2015, there is a certain set of invariants that an object
is supposed to maintain. One of those is that a non-configurable
property can't just disappear. Window objects obviously can't maintain
that invariant, so they can't be allowed to have non-configurable
properties, at least in terms of observability from script.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1107443
Standard:
http://www.ecma-international.org/ecma-262/6.0/#sec-invariants-of-the-essential-internal-methods
Platforms: all
Estimated release date: Unclear so far; need to see how web-compatible
this is.
Preference controlling this: no preference, but a !RELEASE_BUILD ifdef.
So this will be enabled in nightly and Aurora only.
-Boris
0 new messages