borisyankov/DefinitelyTyped — pull request #3205 by payojbaral (2014-11-22 20:30:38+00:00)
Title: SetGrouping and GetGrouping should accept and return GroupingOptions<T>[]

This is to be able to use multilevel grouping in slickgrid. Issue #3134 - https://github.com/borisyankov/DefinitelyTyped/issues/3134