Fixed sortField prop type.

src/components/column/Column.d.ts

@@ -3,7 +3,7 @@ import Vue from 'vue';
 declare class Column extends Vue {
     columnKey?: any;
     field?: string;
-    sortField?: string;
+    sortField?: string | ((item: any) => any);
     filterField?: string;
     sortable?: boolean;
     header?: any;

src/components/column/Column.vue

@@ -11,7 +11,7 @@ export default {
             default: null
         },
         sortField: {
-            type: String,
+            type: [String, Function],
             default: null
         },
         filterField: {

src/components/datatable/DataTable.d.ts

@@ -16,7 +16,7 @@ declare class DataTable extends Vue {
     lazy?: boolean;
     loading?: boolean;
     loadingIcon?: string;
-    sortField?: string | Function;
+    sortField?: string | ((item: any) => any);
     sortOrder?: number;
     defaultSortOrder?: number;
     multiSortMeta?: any[];
@@ -58,6 +58,7 @@ declare class DataTable extends Vue {
     virtualScroll?: boolean;
     virtualRowHeight?: string;
     virtualScrollDelay?: number;
+
     $emit(eventName: 'page', event: Event): this;
     $emit(eventName: 'sort', event: Event): this;
     $emit(eventName: 'filter', event: Event): this;
@@ -78,13 +79,14 @@ declare class DataTable extends Vue {
     $emit(eventName: 'row-edit-init', event: Event): this;
     $emit(eventName: 'row-edit-save', event: Event): this;
     $emit(eventName: 'row-edit-cancel', event: Event): this;
+
     $slots: {
         header: VNode[];
         paginatorLeft: VNode[];
         paginatorRight: VNode[];
         empty: VNode[];
         footer: VNode[];
-    }
+    };
 }
 
 export default DataTable;

src/components/datatable/TableHeader.vue

@@ -85,7 +85,7 @@ export default {
             default: 'single'
         },
         sortField: {
-            type: String,
+            type: [String, Function],
             default: null
         },
         sortOrder: {

src/components/dataview/DataView.d.ts

@@ -13,7 +13,7 @@ declare class DataView extends Vue {
     pageLinkSize?: number;
     rowsPerPageOptions?: number[];
     currentPageReportTemplate?: string;
-    sortField?: string;
+    sortField?: string | ((item: any) => any);
     sortOrder?: number;
     lazy?: boolean;
     $emit(eventName: 'page', event: Event): this;

src/components/dataview/DataView.vue

@@ -95,7 +95,7 @@ export default {
             default: '({currentPage} of {totalPages})'
         },
         sortField: {
-            type: String,
+            type: [String, Function],
             default: null
         },
         sortOrder: {