145460 2015-05-29 10:17:12 -0700 Make Function.(name|length) configurable 2016-05-25 10:51:57 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED WORKSFORME P2 Normal --- 1 yselivanov webkit-unassigned cdumez ggaren gskachkov mark.lam yselivanov zcorpan oldest_to_newest 1098130 0 yselivanov 2015-05-29 10:17:12 -0700 This is an important feature for OOP libraries: typically classes are emulated using functions, hence class *static* properties are properties of the function object that represents the class. Since '.name' and '.length' properties are read-only and non-configurable for functions, there is no way to have '.name' and '.length' static properties for classes. This is something that has already been fixed in Chrome and Firefox: - https://bugzilla.mozilla.org/show_bug.cgi?id=1084019 - https://chromium.googlesource.com/v8/v8/+/f6cd009efd7a032907b11265e74102b0d45207a1%5E!/ And InternetExplorer doesn't have any restrictions on these properties, which leaves WebKit/Safari the only browser that doesn't support this. 1098131 1 yselivanov 2015-05-29 10:23:59 -0700 In short, the following should work: function f(){}; Object.defineProperty(f, 'name', {value: 'g'}); 1196259 2 zcorpan 2016-05-25 03:08:19 -0700 *** Bug 158062 has been marked as a duplicate of this bug. *** 1196260 3 zcorpan 2016-05-25 03:13:59 -0700 Test for "length" in test262 at https://github.com/tc39/test262/blob/83b27c9beb7b3ea78b319148b5c82a5411a333b1/test/language/statements/function/13.2-15-1.js#L19 1196383 4 mark.lam 2016-05-25 10:51:57 -0700 This is already fixed in ToT. You can verify this for yourself using Safari Technology Preview or a WebKit Nightly build (https://webkit.org/downloads/).