diff --git a/examples/hello-poll.ts b/examples/hello-poll.ts
index e0fc6c1..5fecebc 100644
--- a/examples/hello-poll.ts
+++ b/examples/hello-poll.ts
@@ -16,7 +16,7 @@ import {
   StarredProjectsResponse
 } from '@timesafari/polling-contracts';
 import { 
-  StarredProjectsRequestSchema,
+  // StarredProjectsRequestSchema,
   StarredProjectsResponseSchema,
   createResponseValidator,
   generateIdempotencyKey
diff --git a/examples/stale-data-ux.ts b/examples/stale-data-ux.ts
index d915c09..7330eb7 100644
--- a/examples/stale-data-ux.ts
+++ b/examples/stale-data-ux.ts
@@ -148,14 +148,14 @@ class iOSStaleDataUX {
       ]
     };
     
-    this.viewController.present(alert, animated: true);
+    this.viewController.present(alert, { animated: true });
   }
   
   showBannerView(hoursSinceUpdate: number): void {
     // Create banner view
     const banner = {
       title: NSLocalizedString(I18N_KEYS['staleness.banner.title'], ''),
-      message: String(format: NSLocalizedString(I18N_KEYS['staleness.banner.message'], ''), hoursSinceUpdate),
+      message: NSLocalizedString(I18N_KEYS['staleness.banner.message'], '').replace('{hours}', hoursSinceUpdate.toString()),
       backgroundColor: 'systemYellow',
       textColor: 'label',
       actions: [
@@ -294,7 +294,7 @@ class WebStaleDataUX {
 class StaleDataManager {
   private platform: 'android' | 'ios' | 'web';
   private ux: AndroidStaleDataUX | iOSStaleDataUX | WebStaleDataUX;
-  private lastSuccessfulPoll: number = 0;
+  private lastSuccessfulPoll = 0;
   
   constructor(platform: 'android' | 'ios' | 'web', context?: any) {
     this.platform = platform;
diff --git a/packages/polling-contracts/src/types.ts b/packages/polling-contracts/src/types.ts
index 090c1eb..52e552e 100644
--- a/packages/polling-contracts/src/types.ts
+++ b/packages/polling-contracts/src/types.ts
@@ -2,7 +2,7 @@
  * Core TypeScript interfaces for polling system
  */
 
-import { z } from 'zod';
+// import { z } from 'zod';
 
 // Core polling interfaces
 export interface GenericPollingRequest<TRequest, TResponse> {
diff --git a/src/definitions.ts b/src/definitions.ts
index 9e276f1..5a08b00 100644
--- a/src/definitions.ts
+++ b/src/definitions.ts
@@ -363,7 +363,7 @@ export interface DailyNotificationPlugin {
   getContentHistory(): Promise<ContentFetchResult[]>;
   
   // Callback management methods
-  registerCallback(name: string, callback: Function): Promise<void>;
+  registerCallback(name: string, callback: (...args: any[]) => void): Promise<void>;
   unregisterCallback(name: string): Promise<void>;
   getRegisteredCallbacks(): Promise<string[]>;
   
diff --git a/src/web/index.ts b/src/web/index.ts
index 4891d2c..1c79a1e 100644
--- a/src/web/index.ts
+++ b/src/web/index.ts
@@ -348,7 +348,7 @@ export class DailyNotificationWeb implements DailyNotificationPlugin {
   /**
    * Register callback (web implementation)
    */
-  async registerCallback(name: string, _callback: Function): Promise<void> {
+  async registerCallback(name: string, _callback: (...args: any[]) => void): Promise<void> {
     console.log('Callback registered (web mock):', name);
   }
 
diff --git a/test-apps/android-test/src/index.ts b/test-apps/android-test/src/index.ts
index cb8193f..57d5650 100644
--- a/test-apps/android-test/src/index.ts
+++ b/test-apps/android-test/src/index.ts
@@ -1,16 +1,16 @@
-import { Capacitor } from '@capacitor/core';
-import { DailyNotificationPlugin } from '@timesafari/daily-notification-plugin';
+// import { Capacitor } from '@capacitor/core';
+// import { DailyNotificationPlugin } from '@timesafari/daily-notification-plugin';
 
 // Phase 4: Import TimeSafari components
-import { EndorserAPIClient, TIMESAFARI_ENDSORER_CONFIG } from '../shared/typescript/EndorserAPIClient';
-import { SecurityManager, TIMESAFARI_SECURITY_CONFIG } from '../shared/typescript/SecurityManager';
-import { TimeSafariNotificationManager, DEFAULT_TIMESAFARI_PREFERENCES } from '../shared/typescript/TimeSafariNotificationManager';
-import { 
-  TimeSafariUser, 
-  TimeSafariPreferences, 
-  EnhancedTimeSafariNotification,
-  TimeSafariNotificationType 
-} from '../../../src/definitions';
+import { EndorserAPIClient } from '../shared/typescript/EndorserAPIClient';
+import { SecurityManager } from '../shared/typescript/SecurityManager';
+import { TimeSafariNotificationManager } from '../shared/typescript/TimeSafariNotificationManager';
+// import { 
+//   TimeSafariUser, 
+//   TimeSafariPreferences, 
+//   EnhancedTimeSafariNotification,
+//   TimeSafariNotificationType 
+// } from '../../../src/definitions';
 
 // Generic Polling Interface
 import {
@@ -144,7 +144,7 @@ class MockDailyNotificationService {
     console.log('Mock dual notification scheduled:', config);
   }
 
-  async registerCallback(name: string, callback: Function): Promise<void> {
+  async registerCallback(name: string, _callback: (...args: any[]) => void): Promise<void> {
     console.log(`Mock callback registered: ${name}`);
   }
 
@@ -766,7 +766,7 @@ class TimeSafariAndroidTestApp {
   private async testCallbacks() {
     try {
       this.log('Testing TimeSafari notification callbacks...');
-      const config = this.configLoader.getConfig();
+      // const config = this.configLoader.getConfig();
       
       // Register offers callback
       await this.notificationService.registerCallback('offers', async (event: any) => {
@@ -950,7 +950,7 @@ class TimeSafariAndroidTestApp {
     try {
       this.log('🔐 Testing SecurityManager...');
       
-      const timeSafariUser = this.configLoader.getTimeSafariUser();
+      // const timeSafariUser = this.configLoader.getTimeSafariUser();
       
       // Test JWT generation
       const jwt = await this.securityManager.generateJWT({
diff --git a/test-apps/electron-test/src/index.ts b/test-apps/electron-test/src/index.ts
index a65b4fa..93fdc17 100644
--- a/test-apps/electron-test/src/index.ts
+++ b/test-apps/electron-test/src/index.ts
@@ -1,15 +1,15 @@
 import { ConfigLoader, MockDailyNotificationService, TestLogger } from '../shared/config-loader';
 
 // Phase 4: Import TimeSafari components
-import { EndorserAPIClient, TIMESAFARI_ENDSORER_CONFIG } from '../shared/typescript/EndorserAPIClient';
-import { SecurityManager, TIMESAFARI_SECURITY_CONFIG } from '../shared/typescript/SecurityManager';
-import { TimeSafariNotificationManager, DEFAULT_TIMESAFARI_PREFERENCES } from '../shared/typescript/TimeSafariNotificationManager';
-import { 
-  TimeSafariUser, 
-  TimeSafariPreferences, 
-  EnhancedTimeSafariNotification,
-  TimeSafariNotificationType 
-} from '../../../src/definitions';
+import { EndorserAPIClient } from '../shared/typescript/EndorserAPIClient';
+import { SecurityManager } from '../shared/typescript/SecurityManager';
+import { TimeSafariNotificationManager } from '../shared/typescript/TimeSafariNotificationManager';
+// import { 
+//   TimeSafariUser, 
+//   TimeSafariPreferences, 
+//   EnhancedTimeSafariNotification,
+//   TimeSafariNotificationType 
+// } from '../../../src/definitions';
 
 // Enhanced UI components for Electron testing
 class PermissionManager {
@@ -588,7 +588,7 @@ class TimeSafariElectronTestApp {
   private async testCallbacks() {
     try {
       this.log('Testing TimeSafari Electron notification callbacks...');
-      const config = this.configLoader.getConfig();
+      // const config = this.configLoader.getConfig();
       
       // Register offers callback
       await this.notificationService.registerCallback('offers', async (event: any) => {
@@ -781,7 +781,7 @@ class TimeSafariElectronTestApp {
     try {
       this.log('🔐 Testing SecurityManager (Electron)...');
       
-      const timeSafariUser = this.configLoader.getTimeSafariUser();
+      // const timeSafariUser = this.configLoader.getTimeSafariUser();
       
       // Test JWT generation
       const jwt = await this.securityManager.generateJWT({
diff --git a/test-apps/ios-test/src/index.ts b/test-apps/ios-test/src/index.ts
index 177d010..e8ab7f1 100644
--- a/test-apps/ios-test/src/index.ts
+++ b/test-apps/ios-test/src/index.ts
@@ -5,12 +5,12 @@ import { ConfigLoader, MockDailyNotificationService, TestLogger } from '../share
 import { EndorserAPIClient } from '../shared/typescript/EndorserAPIClient';
 import { SecurityManager } from '../shared/typescript/SecurityManager';
 import { TimeSafariNotificationManager } from '../shared/typescript/TimeSafariNotificationManager';
-import { 
-  TimeSafariUser, 
-  TimeSafariPreferences, 
-  EnhancedTimeSafariNotification,
-  TimeSafariNotificationType 
-} from '../../../src/definitions';
+// import { 
+//   TimeSafariUser, 
+//   TimeSafariPreferences, 
+//   EnhancedTimeSafariNotification,
+//   TimeSafariNotificationType 
+// } from '../../../src/definitions';
 
 // Generic Polling Interface
 import {
@@ -621,7 +621,7 @@ class TimeSafariIOSTestApp {
   private async testCallbacks() {
     try {
       this.log('Testing TimeSafari iOS notification callbacks...');
-      const config = this.configLoader.getConfig();
+      // const config = this.configLoader.getConfig();
       
       // Register offers callback
       await this.notificationService.registerCallback('offers', async (event: any) => {
@@ -794,7 +794,7 @@ class TimeSafariIOSTestApp {
     try {
       this.log('🔐 Testing SecurityManager (iOS)...');
       
-      const timeSafariUser = this.configLoader.getTimeSafariUser();
+      // const timeSafariUser = this.configLoader.getTimeSafariUser();
       
       // Test JWT generation
       const jwt = await this.securityManager.generateJWT({
diff --git a/test-apps/shared/config-loader.ts b/test-apps/shared/config-loader.ts
index b68fc63..a32bd65 100644
--- a/test-apps/shared/config-loader.ts
+++ b/test-apps/shared/config-loader.ts
@@ -112,7 +112,9 @@ export class ConfigLoader {
   private static instance: ConfigLoader;
   private config: TimeSafariConfig | null = null;
 
-  private constructor() {}
+  private constructor() {
+    // Private constructor for singleton pattern
+  }
 
   /**
    * Get singleton instance
@@ -354,7 +356,7 @@ export class TestLogger {
     return levels.indexOf(level) <= levels.indexOf(this.logLevel);
   }
 
-  private addToLogs(level: string, message: string, data?: any): void {
+  private addToLogs(level: string, message: string, _data?: any): void {
     const timestamp = new Date().toISOString();
     const logEntry = `[${timestamp}] [${level.toUpperCase()}] ${message}`;
     this.logs.push(logEntry);
@@ -454,7 +456,7 @@ export class MockDailyNotificationService {
   /**
    * Register callback
    */
-  public async registerCallback(name: string, callback: Function): Promise<void> {
+  public async registerCallback(name: string, _callback: (...args: any[]) => void): Promise<void> {
     this.logger.info(`Registering callback: ${name}`);
     // In a real implementation, this would register the callback
     this.logger.info(`Callback ${name} registered successfully`);