golang-samber-do

Type-safe dependency injection in Go is set up by creating a root injector with do.New, registering services using do.Provide variants, and resolving them via do.Invoke or do.MustInvoke to compose a reusable service graph.

samber/do v2 supports Lazy, Eager, Transient, and Value lifecycles for dependency injection. These lifecycles shape service initialization timing and control per-request behavior within the Go service container.

Yes, dependency injection enables swapping implementations for testing in Go. Using implicit aliasing and named services within a container allows you to register mock providers and override real services during test scopes.

Organizing providers across modules in a Go application is best handled through modular package registration. samber/do v2 uses scopes to enable flexible composition and centralize service registrations without creating tangled dependencies.

Dependency injection with samber/do is designed for large modular Go applications. It centralizes providers, enforces interface-driven design, and simplifies lifecycle management across modules to prevent brittle wiring as projects scale.

A Go service container fails when resolving dependencies if providers are missing or improperly registered. Use do.MustInvoke to surface initialization errors immediately, ensuring all required services are wired into the container before invocation.