codebase-design

Refactor tightly coupled code by defining clear seams and applying adapter patterns to isolate dependencies. This framework provides actionable heuristics like interface-first design and dependency injection to reduce surface area and simplify unit testing.

Deep modules are software components with small interfaces but high behavioral density. This design approach improves maintainability by hiding implementation complexity behind simplified interfaces, ensuring team alignment through a standardized vocabulary.

Apply interface-first design by enforcing dependency injection and evaluating modules with the deletion test. This strategy reduces surface area, creates clear architectural seams, and ensures your software modules remain highly testable.

Conduct an architectural review by evaluating the current module structure to identify potential seams for refactoring. Use this framework to establish clear definitions for modules and interfaces, ensuring alignment on testability and design heuristics.

Yes, dependency injection is required to establish clear seams and adapter patterns in an existing codebase. This approach ensures testability and maintainability when refactoring shallow, tightly coupled modules into deep, modular structures.