TypeError: (intermediate value).toLowerCase is not a function

[maxpower9000]

Issue
Error message inside Firefox console:
TypeError: (intermediate value).toLowerCase is not a function.

The message appears on every pageload. Independent of any use of directive().
Just because the browser is loading the corner.js or corner.min.js.

The responsible line of code is:

cornerjs/build/corner.js

Line 748 in 1f4ffd1

element_class_list = (element.className || '').toLowerCase().split(' ');

My setup
corner.js 0.9.3 installed through Yarn
Firefox Developer Edition 60.0b5 on Win7 32bit WAMP-Server

[maxpower9000]

Chrome 64 says:

Uncaught TypeError: (e.className || "").toLowerCase is not a function
    at element_loaded (corner.min.js:1)
    at element_loaded_wrapper (corner.min.js:1)
    at NodeList.forEach (<anonymous>)
    at itar (corner.min.js:1)
    at corner.min.js:1
    at Array.forEach (<anonymous>)
    at itar (corner.min.js:1)
    at MutationObserver.observe.childList (corner.min.js:1)

[Jabher]

Hello! Is it happening in some exact page/domain or all across the internet?

[maxpower9000]

@Jabher Only tested on localhost.

I found some similar issues on SO:

• https://stackoverflow.com/a/42036382
• https://stackoverflow.com/a/25412298

Maybe the issue here also has to do with the automatic semicolon insertion ...

The ECMAScript specification has specific rules for automatic semicolon insertion, however in this case a semicolon isn't automatically inserted because the parenthesised expression that begins on the next line can be interpreted as an argument list for a function call.
This means that without that semicolon, the anonymous window.Glog function was being invoked with a function as the msg parameter, followed by (window) which was subsequently attempting to invoke whatever was returned.

[Jabher]

No, it's different. Can you please catch an error with the debugger and show what inside an "e"?
It should be some kind of HTMLElement.

Or, you can create some test page so I can debug it.

[jrussnone]

I'm having this issue in a project as well. I found that if an SVG is parsed, the property className is actually an object not a string. I have a potential fix in #14