Extract a Module

Extract [feature name] into its own isolated module from my current codebase.

Current code location: [file path or paste relevant code]

Requirements:
1. Create a clean public interface (what other modules can call)
2. Hide implementation details (private functions/classes)
3. Define clear types/interfaces for inputs and outputs
4. Add a module-level docstring explaining its purpose
5. List all external dependencies this module needs
6. Ensure no circular imports with other modules

The module should be completely self-contained. I want to be able to:
- Ask AI to modify just this module without loading the rest of my codebase
- Run tests on this module in isolation
- Swap the implementation without changing calling code

My stack: [your language/framework]

I'm learning, so explain each part simply.