chore(lint): eslint config update

Author: kdinev

.eslintrc.json

@@ -14,9 +14,10 @@
         ],
         "createDefaultProgram": true
       },
+      "plugins": [
+        "@typescript-eslint"
+      ],
       "extends": [
-        "eslint:recommended",
-        "plugin:@typescript-eslint/recommended",
         "plugin:@angular-eslint/recommended",
         "plugin:@angular-eslint/template/process-inline-templates"
       ],

projects/igniteui-angular/.eslintrc.json

@@ -63,6 +63,9 @@
       "files": [
         "*.html"
       ],
+      "extends": [
+        "plugin:@angular-eslint/template/recommended"
+      ],
       "rules": {}
     }
   ]

projects/igniteui-angular/src/lib/calendar/calendar.ts

@@ -411,7 +411,7 @@ export class Calendar {
         // if the week number is greater than week 52
         if (weekNumber > 52) {
             // next year
-            let nextYear = new Date(date.getFullYear() + 1, 0, 1);
+            const nextYear = new Date(date.getFullYear() + 1, 0, 1);
             // first day of the next year
             let nextYearFirstDay = nextYear.getDay() - weekStart;
             nextYearFirstDay = nextYearFirstDay >= 0 ? nextYearFirstDay : nextYearFirstDay + 7;

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.spec.ts

@@ -459,7 +459,7 @@ describe('Basic IgxHierarchicalGrid #hGrid', () => {
         });
 
         it('should update already created child grid with new records added to the root data', () => {
-            let row = hierarchicalGrid.gridAPI.get_row_by_index(0) as IgxHierarchicalRowComponent;
+            const row = hierarchicalGrid.gridAPI.get_row_by_index(0) as IgxHierarchicalRowComponent;
             UIInteractions.simulateClickAndSelectEvent(row.expander);
             fixture.detectChanges();