codebase-design

A deep module in codebase design hides maximum implementation complexity behind a minimal interface. This structure prevents callers from learning excessive internal details while still getting full functional leverage.

Designing clean seams for refactoring involves defining narrow boundaries where dependencies are isolated. You place adapters and ports at these seams to ensure callers interact only with a simplified, testable interface.

The best way to reduce interface leakage is to evaluate what the caller truly needs and hide unnecessary internal dependencies. You reshape the module to expose only essential functions through a smaller, deeper interface.

You need adapters and ports during interface redesign when isolating external dependencies at architectural seams. They allow you to swap underlying implementations without forcing callers to update their interaction logic.

Refactoring for deep modules directly improves testability by isolating dependencies behind clean seams. You can inject test doubles through small interfaces without exposing internal module complexity to your test suites.

Your interface forces callers to learn implementation logic because it is shallow and leaks internal details. You must deepen the module by pushing complexity behind a seam and shrinking the exposed interface.