console.time() should output warning if timer exists

[domfarolino]

• Version: v.10.0.0
• Platform: 16.7.0 Darwin Kernel Version 16.7.0: Tue Jan 30 11:27:06 PST 2018; root:xnu-3789.73.11~1/RELEASE_X86_64 x86_64

The WHATWG Console Standard specifies console.time() as printing a warning to the screen if an associated timer exists. Currently in Node, no warning is printed and the associated existing timer is reset.

[devsnek]

warning is optional but resetting the time is definitely not to spec

[domfarolino]

Whoops, sorry you're right. Yes the warning is optional (though every browser I've tested (except Edge since I don't have access to it) does it).