go-dependency-injection

Dependency injection in Go improves testability by using explicit interfaces and constructor-based wiring to decouple components. This enables mock implementations for isolated unit testing across service and repository boundaries.

The best way to wire dependencies in Go is using constructor-based patterns with functional options. Leveraging tools like Uber Fx or Google Wire provides scalable, type-safe dependency wiring and manages application lifecycle in real-world projects.

Yes, dependency injection applies directly to clean architecture modules in Go. It organizes service boundaries and testable repositories by requiring explicit interfaces and module-style wiring to satisfy design, testing, and deployment requirements.

Uber Fx and Google Wire both provide type-safe dependency wiring for Go. Fx focuses on lifecycle management with runtime wiring, while Wire uses compile-time code generation for static dependency resolution across service and repository scenarios.

Set up a minimal Go module with constructor-based DI by creating explicit interfaces for a repository and service. Use Fx or Wire to wire these constructors together, demonstrating a clean startup and modular assembly.

Avoid dependency injection in Go for simple scripts or small utilities where the overhead of explicit interfaces, constructors, and module-style wiring outweighs the benefits of testability and maintainability.