diff --git a/packages/common/src/grouping-formatters/avgTotalsDollarFormatter.ts b/packages/common/src/grouping-formatters/avgTotalsDollarFormatter.ts
index f12017df3..17cea0145 100644
--- a/packages/common/src/grouping-formatters/avgTotalsDollarFormatter.ts
+++ b/packages/common/src/grouping-formatters/avgTotalsDollarFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from './../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const avgTotalsDollarFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.avg && totals.avg[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const avgTotalsDollarFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.avg?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid, 2);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid, 4);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/avgTotalsFormatter.ts b/packages/common/src/grouping-formatters/avgTotalsFormatter.ts
index 85b88a723..0b3e4e54d 100644
--- a/packages/common/src/grouping-formatters/avgTotalsFormatter.ts
+++ b/packages/common/src/grouping-formatters/avgTotalsFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { decimalFormatted, thousandSeparatorFormatted } from '../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const avgTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  let val = totals.avg && totals.avg[field];
-  const params = columnDef && columnDef.params;
-  let prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const avgTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  let val = totals.avg?.[field];
+  const params = columnDef?.params;
+  let prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/avgTotalsPercentageFormatter.ts b/packages/common/src/grouping-formatters/avgTotalsPercentageFormatter.ts
index 33c3398d5..e15a2c6f8 100644
--- a/packages/common/src/grouping-formatters/avgTotalsPercentageFormatter.ts
+++ b/packages/common/src/grouping-formatters/avgTotalsPercentageFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { decimalFormatted, thousandSeparatorFormatted } from '../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const avgTotalsPercentageFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  let val = totals.avg && totals.avg[field];
-  const params = columnDef && columnDef.params;
-  let prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const avgTotalsPercentageFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  let val = totals.avg?.[field];
+  const params = columnDef?.params;
+  let prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/maxTotalsFormatter.ts b/packages/common/src/grouping-formatters/maxTotalsFormatter.ts
index 3ccccf463..63eb7bfa3 100644
--- a/packages/common/src/grouping-formatters/maxTotalsFormatter.ts
+++ b/packages/common/src/grouping-formatters/maxTotalsFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from '../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const maxTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.max && totals.max[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const maxTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.max?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/minTotalsFormatter.ts b/packages/common/src/grouping-formatters/minTotalsFormatter.ts
index 8072d4a51..875ff44e6 100644
--- a/packages/common/src/grouping-formatters/minTotalsFormatter.ts
+++ b/packages/common/src/grouping-formatters/minTotalsFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from '../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const minTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.min && totals.min[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const minTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.min?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/sumTotalsBoldFormatter.ts b/packages/common/src/grouping-formatters/sumTotalsBoldFormatter.ts
index df5ec7a73..044a7f0dc 100644
--- a/packages/common/src/grouping-formatters/sumTotalsBoldFormatter.ts
+++ b/packages/common/src/grouping-formatters/sumTotalsBoldFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from '../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const sumTotalsBoldFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.sum && totals.sum[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const sumTotalsBoldFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.sum?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/sumTotalsColoredFormatter.ts b/packages/common/src/grouping-formatters/sumTotalsColoredFormatter.ts
index c5408e6b5..2c7bacc75 100644
--- a/packages/common/src/grouping-formatters/sumTotalsColoredFormatter.ts
+++ b/packages/common/src/grouping-formatters/sumTotalsColoredFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from '../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const sumTotalsColoredFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.sum && totals.sum[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const sumTotalsColoredFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.sum?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/sumTotalsDollarBoldFormatter.ts b/packages/common/src/grouping-formatters/sumTotalsDollarBoldFormatter.ts
index 8e2235800..6e44f9e04 100644
--- a/packages/common/src/grouping-formatters/sumTotalsDollarBoldFormatter.ts
+++ b/packages/common/src/grouping-formatters/sumTotalsDollarBoldFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from './../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const sumTotalsDollarBoldFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.sum && totals.sum[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const sumTotalsDollarBoldFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.sum?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid, 2);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid, 4);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/sumTotalsDollarColoredBoldFormatter.ts b/packages/common/src/grouping-formatters/sumTotalsDollarColoredBoldFormatter.ts
index 9200b601a..bddc96455 100644
--- a/packages/common/src/grouping-formatters/sumTotalsDollarColoredBoldFormatter.ts
+++ b/packages/common/src/grouping-formatters/sumTotalsDollarColoredBoldFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from './../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const sumTotalsDollarColoredBoldFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.sum && totals.sum[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const sumTotalsDollarColoredBoldFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.sum?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid, 2);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid, 4);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/sumTotalsDollarColoredFormatter.ts b/packages/common/src/grouping-formatters/sumTotalsDollarColoredFormatter.ts
index 701e52070..b5644329c 100644
--- a/packages/common/src/grouping-formatters/sumTotalsDollarColoredFormatter.ts
+++ b/packages/common/src/grouping-formatters/sumTotalsDollarColoredFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from './../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const sumTotalsDollarColoredFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.sum && totals.sum[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const sumTotalsDollarColoredFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.sum?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid, 2);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid, 4);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/sumTotalsDollarFormatter.ts b/packages/common/src/grouping-formatters/sumTotalsDollarFormatter.ts
index b13f04892..edbbee213 100644
--- a/packages/common/src/grouping-formatters/sumTotalsDollarFormatter.ts
+++ b/packages/common/src/grouping-formatters/sumTotalsDollarFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from './../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const sumTotalsDollarFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.sum && totals.sum[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const sumTotalsDollarFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.sum?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid, 2);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid, 4);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/grouping-formatters/sumTotalsFormatter.ts b/packages/common/src/grouping-formatters/sumTotalsFormatter.ts
index 7868a4c31..859d00db0 100644
--- a/packages/common/src/grouping-formatters/sumTotalsFormatter.ts
+++ b/packages/common/src/grouping-formatters/sumTotalsFormatter.ts
@@ -1,13 +1,13 @@
-import { Column, GroupTotalsFormatter } from './../interfaces/index';
+import { Column, GroupTotalsFormatter, SlickGrid } from './../interfaces/index';
 import { formatNumber } from '../services/utilities';
 import { getValueFromParamsOrFormatterOptions } from '../formatters/formatterUtilities';
 
-export const sumTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => {
-  const field = columnDef.field || '';
-  const val = totals.sum && totals.sum[field];
-  const params = columnDef && columnDef.params;
-  const prefix = params && params.groupFormatterPrefix || '';
-  const suffix = params && params.groupFormatterSuffix || '';
+export const sumTotalsFormatter: GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => {
+  const field = columnDef.field ?? '';
+  const val = totals.sum?.[field];
+  const params = columnDef?.params;
+  const prefix = params?.groupFormatterPrefix || '';
+  const suffix = params?.groupFormatterSuffix || '';
   const minDecimal = getValueFromParamsOrFormatterOptions('minDecimal', columnDef, grid);
   const maxDecimal = getValueFromParamsOrFormatterOptions('maxDecimal', columnDef, grid);
   const decimalSeparator = getValueFromParamsOrFormatterOptions('decimalSeparator', columnDef, grid, '.');
diff --git a/packages/common/src/interfaces/aggregator.interface.ts b/packages/common/src/interfaces/aggregator.interface.ts
index 39c0854c2..df76e2665 100644
--- a/packages/common/src/interfaces/aggregator.interface.ts
+++ b/packages/common/src/interfaces/aggregator.interface.ts
@@ -1,16 +1,16 @@
 export interface Aggregator {
-  /** Aggregator associated Field Id */
-  field?: number | string;
+  /** Column definition field Id of the associated Aggregator */
+  field: number | string;
 
-  /** Aggregator associated type */
-  type?: string;
+  /** Type of Aggregator (sum, avg, ...) */
+  type: string;
 
   /** Aggregator initialize method */
   init: () => void;
 
-  /** Mathod to accumulate the result with different logic depending on each aggregator type */
+  /** Method to accumulate the result which will be different for each Aggregator type */
   accumulate?: (item: any) => void;
 
-  /** Method to store the result into the given group total argument provided */
-  storeResult?: (groupTotals: any | undefined) => void;
+  /** Method to store the result into the given group total object provided as argument */
+  storeResult: (groupTotals: any | undefined) => void;
 }
diff --git a/packages/common/src/interfaces/groupTotalsFormatter.interface.ts b/packages/common/src/interfaces/groupTotalsFormatter.interface.ts
index 517be07fc..ce919fb10 100644
--- a/packages/common/src/interfaces/groupTotalsFormatter.interface.ts
+++ b/packages/common/src/interfaces/groupTotalsFormatter.interface.ts
@@ -1,3 +1,4 @@
 import { Column } from './column.interface';
+import { SlickGrid } from './slickGrid.interface';
 
-export type GroupTotalsFormatter = (totals: any, columnDef: Column, grid?: any) => string;
+export type GroupTotalsFormatter = (totals: any, columnDef: Column, grid: SlickGrid) => string;