HIPAA-Compliant Patient Data Anonymization Middleware

Design a Node.js Express middleware that automatically sanitizes and anonymizes patient health records before API transmission, ensuring HIPAA compliance. Implement a robust transformation strategy that removes personally identifiable information while preserving essential medical data. Create type-safe transformations using TypeScript that handle different record types (lab results, diagnostic imaging, clinical notes) with configurable anonymization levels. Include comprehensive error handling and logging mechanisms that track anonymization processes without storing sensitive information.