fix(types): add missing option flags in grouping interface

src/app/modules/angular-slickgrid/models/grouping.interface.ts

@@ -6,15 +6,18 @@ import { SortDirectionNumber } from './sortDirectionNumber.enum';
 export type GroupingGetterFunction = (value: any) => string;
 
 export interface Grouping {
-  /** Getter of the Column to be Grouped */
-  getter?: string | GroupingGetterFunction;
-
   /** Grouping Aggregators array */
   aggregators?: Aggregator[];
 
+  /** Defaults to false, are we aggregating child grouping? */
+  aggregateChildGroups?: boolean;
+
   /** Defaults to false, are the Aggregator Collapsed when grid is loaded */
   aggregateCollapsed?: boolean;
 
+  /** Defaults to false, are we aggregating empty grouping? */
+  aggregateEmpty?: boolean;
+
   /** Defaults to false, is the Group Collapsed when grid is loaded */
   collapsed?: boolean;
 
@@ -27,6 +30,9 @@ export interface Grouping {
   /** String Formatter of the Grouping Header */
   formatter?: (g: GroupingFormatterItem) => string;
 
+  /** Getter of the Column to be Grouped */
+  getter?: string | GroupingGetterFunction;
+
   /** Defaults to false, lazy load the Group Totals Calculation */
   lazyTotalsCalculation?: boolean;