Bug 161554 - Object.preventExtensions(window) should throw a TypeError
Summary: Object.preventExtensions(window) should throw a TypeError
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: DOM (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Chris Dumez
URL: https://tc39.github.io/ecma262/#sec-o...
Keywords: WebExposed
Depends on:
Blocks:
 
Reported: 2016-09-02 16:16 PDT by Chris Dumez
Modified: 2020-11-23 23:45 PST (History)
7 users (show)

See Also:

Attachments
Patch (5.77 KB, patch)
2016-09-02 19:02 PDT, Chris Dumez 		no flags Details | Formatted Diff | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Chris Dumez 2016-09-02 16:16:47 PDT 
Object.preventExtensions() should throw a TypeError if [[PreventExtensions]] returns false:
- https://tc39.github.io/ecma262/#sec-object.preventextensions

We currently do not throw.
Comment 1 Chris Dumez 2016-09-02 19:02:08 PDT 
Created attachment 287845 [details]
Patch
Comment 2 Darin Adler 2016-09-03 07:25:43 PDT 
Comment on attachment 287845 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=287845&action=review

The code here doesn’t make sense to me.

> Source/WebCore/bindings/js/JSDOMWindowCustom.cpp:349
> +    throwTypeError(exec, scope, ASCIILiteral("Cannot prevent extensions on this object"));

Should the message be more specific than "this object"?
Comment 3 WebKit Commit Bot 2016-09-03 07:46:54 PDT 
Comment on attachment 287845 [details]
Patch

Clearing flags on attachment: 287845

Committed r205404: <http://trac.webkit.org/changeset/205404>
Comment 4 WebKit Commit Bot 2016-09-03 07:46:57 PDT 
All reviewed patches have been landed.  Closing bug.