diff --git a/pages/app/index.tsx b/pages/app/index.tsx
index a5b0b16aaa..f6ea0d8b87 100644
--- a/pages/app/index.tsx
+++ b/pages/app/index.tsx
@@ -24,8 +24,7 @@ function App() {
     urlParams: { density, motionDisabled },
   } = useContext(AppContext);
 
-  const isAppLayout =
-    pageId !== undefined && (pageId.indexOf('app-layout') > -1 || pageId.indexOf('content-layout') > -1);
+  const isAppLayout = pageId !== undefined && (pageId.includes('app-layout') || pageId.includes('content-layout'));
   // AppLayout already contains <main>
   // Also, AppLayout pages should resemble the ConsoleNav 2.0 styles
   const ContentTag = isAppLayout ? 'div' : 'main';
diff --git a/pages/cards/selection.page.tsx b/pages/cards/selection.page.tsx
index 0c699f0ccc..3ec389b931 100644
--- a/pages/cards/selection.page.tsx
+++ b/pages/cards/selection.page.tsx
@@ -13,7 +13,7 @@ interface Item {
 const ariaLabels: CardsProps<Item>['ariaLabels'] = {
   selectionGroupLabel: 'group label',
   itemSelectionLabel: ({ selectedItems }, item) =>
-    `${item.text} is ${selectedItems.indexOf(item) < 0 ? 'not ' : ''}selected`,
+    `${item.text} is ${!selectedItems.includes(item) ? 'not ' : ''}selected`,
 };
 
 function createSimpleItems(count: number) {
diff --git a/pages/tsconfig.json b/pages/tsconfig.json
index edf008d36e..5c14178b3d 100644
--- a/pages/tsconfig.json
+++ b/pages/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "lib": ["ES2015", "DOM"],
+    "lib": ["ES2020", "DOM"],
     "target": "ES2015",
     "declaration": false,
     "declarationMap": false,
diff --git a/src/test-utils/tsconfig.json b/src/test-utils/tsconfig.json
index 3fbd14e166..8a751a4639 100644
--- a/src/test-utils/tsconfig.json
+++ b/src/test-utils/tsconfig.json
@@ -4,7 +4,7 @@
     "incremental": true,
     "module": "CommonJS",
     "target": "ES2015",
-    "lib": ["ES2015", "DOM"],
+    "lib": ["ES2020", "DOM"],
     "declaration": true,
     "allowSyntheticDefaultImports": true,
     "outDir": "../../lib/components/test-utils",
diff --git a/tsconfig.integ.json b/tsconfig.integ.json
index a71a0b8918..9eca090158 100644
--- a/tsconfig.integ.json
+++ b/tsconfig.integ.json
@@ -1,8 +1,6 @@
 {
+  "extends": "@tsconfig/node16/tsconfig.json",
   "compilerOptions": {
-    "module": "commonjs",
-    "target": "es2017",
-    "lib": ["es2017", "dom"],
     "types": ["jest"],
     "noEmit": true,
     "strict": true,
diff --git a/tsconfig.json b/tsconfig.json
index 5fbd373394..6fa37ece67 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "lib": ["ES2015", "ES2017.Intl", "ES2018.Intl", "ES2020.Intl", "DOM"],
+    "lib": ["ES2020", "DOM"],
     "target": "ES2015",
     "types": [],
     "module": "ES2015",
diff --git a/tsconfig.unit.json b/tsconfig.unit.json
index 61d5d5420a..8b2c7d5258 100644
--- a/tsconfig.unit.json
+++ b/tsconfig.unit.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "es2018",
-    "lib": ["es2018", "dom"],
+    "lib": ["es2020", "dom"],
     "types": ["node", "jest", "@testing-library/jest-dom"],
     "moduleResolution": "node",
     "downlevelIteration": true,