React Native may default to TypeScript based on the latest templates. To create a project with JavaScript (`App.js`), follow these steps:  
Solution 1: Create a JavaScript Project Directly
Run:  
npx react-native init MyApp --template react-native-template-js
Solution 2: Convert TypeScript to JavaScript Manually
1. Rename `App.tsx` → `App.js`  
2. Remove TypeScript Dependencies  
   npm uninstall typescript @types/react @types/react-native
3. Restart Metro Bundler  
   npm start --reset-cache