diff --git a/examples/calculator/src/index.tsx b/examples/calculator/src/index.tsx
index 852911990..328248060 100644
--- a/examples/calculator/src/index.tsx
+++ b/examples/calculator/src/index.tsx
@@ -85,7 +85,7 @@ function safeEval(expr: string): string {
     if (tokens.length === 0) return '0';
 
     // Handle initial negative number
-    if (tokens[0] === '-' && tokens.length > 1 && !isNaN(Number(tokens[1]))) {
+    if (tokens[0] === '-' && tokens.length > 1 && !Number.isNaN(Number(tokens[1]))) {
         tokens.splice(0, 2, '-' + tokens[1]);
     }
 
diff --git a/examples/widget-gallery/src/index.ts b/examples/widget-gallery/src/index.ts
index 57b141244..ec688a7fc 100644
--- a/examples/widget-gallery/src/index.ts
+++ b/examples/widget-gallery/src/index.ts
@@ -129,7 +129,7 @@ class WidgetGalleryApp extends Widget {
         }
 
         // Tab switching: 1-6
-        const num = parseInt(event.key);
+        const num = parseInt(event.key, 10);
         if (num >= 1 && num <= 6) {
             this._switchTab(num - 1);
             return true;
diff --git a/packages/ui/src/prompts.ts b/packages/ui/src/prompts.ts
index b92bb28ba..06a6845f0 100644
--- a/packages/ui/src/prompts.ts
+++ b/packages/ui/src/prompts.ts
@@ -69,7 +69,7 @@ async function promptText(options: TextPromptOptions): Promise<string> {
 async function promptConfirm(options: ConfirmPromptOptions): Promise<boolean> {
     if (!process.stdin.isTTY) throw new NonInteractiveError();
 
-    const hint = options.default === true ? 'Y/n' : options.default === false ? 'y/N' : 'y/n';
+    const hint = options.default  ? 'Y/n' : options.default === false ? 'y/N' : 'y/n';
 
     return new Promise((resolve) => {
         const rl = readline.createInterface({