265526 2023-11-29 08:45:49 -0800 Incorrect `with` statement behavior - function call breaks out of `with` 'scope' 2024-01-23 14:01:14 -0800 1 1 1 Unclassified WebKit JavaScriptCore Safari 17 Unspecified Unspecified RESOLVED DUPLICATE 163209 InRadar P2 Normal --- 1 niseg98160 webkit-unassigned ashvayka karlcow mark.lam webkit-bug-importer ysuzuki oldest_to_newest 1995607 0 niseg98160 2023-11-29 08:45:49 -0800 (Obligatory: The `with` statement has long been deprecated, but unfortunately since there is a lot of legacy code which relies on it, one cannot always avoid interacting with code that relies on `with`.) The following code works fine on all other browsers. Safari throws "ReferenceError: Can't find variable: abc". ``` with({abc:3}) { function foo() { console.log(abc); } foo(); } ``` I am managing a large-ish (~4M MAU) platform for which this has become an issue in certain situations, and currently I just have to tell users "Please use Firefox or Chrome". I'd like to eventually get my hands dirty and try to implement a hacky fix here (it involves interaction with user-land code, so it's not easy), but if the `with` behavior could be brought into line with other engines that would be excellent. 1995609 1 niseg98160 2023-11-29 08:53:07 -0800 One weird thing I noticed: If I pause the debugger, and then run the code in the console, it works fine. If the debugger is not paused and I run the code, then I get the ReferenceError that I mentioned in the previous message. 1995798 2 karlcow 2023-11-29 19:08:53 -0800 it's working for me with and without the debugger paused. So there is something else going on. 1997390 3 webkit-bug-importer 2023-12-06 08:46:13 -0800 <rdar://problem/119258532> 2006919 4 mark.lam 2024-01-23 10:43:37 -0800 Hi Joe, can you tell me what website(s) are impacted by this, or if you don't want to disclose that publicly, can you email me the details? That will help us prioritize this accordingly. Thanks. 2006992 5 ashvayka 2024-01-23 14:01:14 -0800 Thank you Joe for filing this so very nicely! The issue was fixed in https://commits.webkit.org/268553@main, please retry with the newest Safari Technology Preview. (In reply to Joe from comment #1) > One weird thing I noticed: If I pause the debugger, and then run the code in > the console, it works fine. If the debugger is not paused and I run the > code, then I get the ReferenceError that I mentioned in the previous message. This makes sense: before https://bugs.webkit.org/show_bug.cgi?id=163209 was fixed, functions declared in global scope but inside a block (`with` statement block) were erroneously created in global scope. *** This bug has been marked as a duplicate of bug 163209 ***