borisyankov/DefinitelyTyped — pull request #3207 by vvakame (2014-11-23 00:57:12+00:00)
Title: add overload definition to setGrouping

https://github.com/mleibman/SlickGrid/blob/e004912b5ce29ac0d0cb04df50fe66db5e3af9ea/slick.dataview.js#L230