143066 2015-03-25 16:46:17 -0700 Poor runtime error message dealing with undefined in strict mode compared to non-strict mode 2017-01-18 23:39:11 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified ASSIGNED P2 Normal --- 1 joepeck saam ggaren joepeck rniwa saam oldest_to_newest 1080100 0 joepeck 2015-03-25 16:46:17 -0700 * SUMMARY Very poor runtime error message dealing with undefined in strict mode compared to non-strict mode. * TEST <script> "use strict"; function Foo() { this._key = undefined; this._key.name = "test"; } new Foo; </script> * NON-STRICT (expected) [Error] TypeError: undefined is not an object (evaluating 'this._key.name = "test"') * STRICT (actual) [Error] TypeError: Attempted to assign to readonly property. * NOTES - Because Classes imply strict mode and we've started making heavy use of classes, this will greatly impact us when working on WebInspector. 1080123 1 timothy 2015-03-25 17:30:07 -0700 This stumped me for a while today. 1080819 2 saam 2015-03-27 17:32:31 -0700 I'll take this