Unlike PHP JavaScript is finicky about having extra commas in array definitions. The Good News is that I search all of Drupal and only found this one violation of JavaScript's formatting rules.

Files: 
CommentFileSizeAuthor
Toolbar.patch469 bytescosmicdreams
PASSED: [[SimpleTest]]: [MySQL] 58,802 pass(es).
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Status:Needs review» Reviewed & tested by the community

I went to open the file in phpStorm to get a bit more context, and it warned me about the extra comma ;)

Status:Reviewed & tested by the community» Fixed

Committed and pushed to 8.x. Thanks!

Status:Fixed» Closed (fixed)

Automatically closed -- issue fixed for 2 weeks with no activity.