golang-dependency-injection

Dependency injection in Go improves testability by making dependencies explicit and centrally wired, eliminating hidden dependencies through constructor-based injection at the composition root and using interfaces at consumption boundaries.

Choosing a Go dependency injection library depends on project size and type-safety preferences. Select google/wire for compile-time safety, uber-go/dig+fx for lifecycle management, or samber/do for lifecycle-aware dependency graphs.

Refactor Go code by removing globals and init-based service setup through manual constructor injection, migrating away from service-locator anti-patterns, and ensuring no container injection occurs directly into services.

You need singleton or transient lifecycles in Go dependency injection when managing stateful dependencies, utilizing lazy initialization guidance for lifecycle-aware dependency graphs to optimize resource allocation and application startup.

Yes, dependency injection works with manual wiring for small Go projects by applying manual constructor injection, establishing clear wiring order from infrastructure to transport without requiring a dedicated DI container.