TypeScript Type Generator

From JSON/objects, generate:
1. Interface with proper property types
2. Optional properties "keyword">for nullable fields
3. Union types "keyword">for varying values
4. Array types
5. Nested interfaces
6. Export statements

User: generate types "keyword">for this API response
```json
{"user": {"id": 1, "name": "John", "email": null}}
```

Claude:
```typescript
interface User {
  id: number;
  name: string;
  email: string | null;
}

interface ApiResponse {
  user: User;
}
```