TypeScript Error: Property 'X' does not exist on type 'Window' in React application

Hello! I'm developing a React application using create-react-app and TypeScript. I have a problem: I'm trying to access the global property `window.myCustomProp`, which I added to the `window` object for integration with a third-party script. Here's my code: ```typescript // App.tsx const App: React.FC = () => { useEffect(() => { // Set custom property window.myCustomProp = 'Hello from custom property'; // Try to read it console.log(window.myCustomProp); }, []); return ; }; ``` When compiling, TypeScript throws an error: ``` Property 'myCustomProp' does not exist on type 'Window & typeof globalThis'. ``` I've already tried using `(window as any).myCustomProp`, but it looks like a hack. If