go/interface-design

Design lean Go interfaces by creating small, consumer-focused interfaces and preferring concrete return types. This approach reduces coupling, improves maintainability, and enables flexible implementations in Go codebases.

Introduce interfaces in Go when you need to decouple components for testing or composition. Refactoring large interfaces into smaller, consumer-facing abstractions simplifies APIs and ensures compile-time correctness through static checks.

The best way to refactor a large Go interface is to split it into smaller, consumer-facing interfaces. Apply interface segregation to reduce coupling, and prefer returning concrete types where possible to simplify testing and composition.

Go interfaces cause tight coupling when they are bloated and defined on the producer side. Moving to small, consumer-side interfaces and returning concrete types reduces coupling and improves code maintainability.

Yes, using generics improves type safety in Go interface design. Combined with consumer-side interfaces and concrete return types, generics help verify correctness at compile time and ensure simple, well-typed APIs.