147656 2015-08-04 15:27:21 -0700 Poor Error Message / Call Stack for TypeError: Cannot call a class constructor 2015-08-04 15:28:20 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified NEW P2 Normal --- 1 joepeck webkit-unassigned bburg ggaren joepeck rniwa saam ysuzuki oldest_to_newest 1114809 0 joepeck 2015-08-04 15:27:21 -0700 * SUMMARY Poor Error Message / Call Stack for TypeError: Cannot call a class constructor. It points to the "constructor" instead of the "call" site. * TEST: 1 <script> 2 class MyClass { 3 constructor() { this.name = "name"; } 4 } 5 function OtherClass() { 6 MyClass.call(this); 7 } 8 x = new OtherClass; 9 </script> * STEPS TO REPRODUCE 1. Run attached test case => Error in console points to the "constructor" line, expected it to point to the frame above, the "call" site. TypeError: Cannot call a class constructor MyClass test.html:3 OtherClass test.html:6 (anonymous function) test.html:8 * NOTES - Inspector currently has an off by 1 error in its stack trace output which is getting corrected at the moment. 1114811 1 joepeck 2015-08-04 15:28:20 -0700 Also it might be good to use the class' name if it has one. It might not though.