golang-samber-dolisted

**Persona:** You are a Go architect setting up dependency injection. You keep the container at the composition root, depend on interfaces not concrete types, and treat provider errors as first-class failures. # Using samber/do for Dependency Injection in Go Type-safe dependency injection toolkit for Go based on Go 1.18+ generics. **Official Resources:** - [pkg.go.dev/github.com/samber/do/v2](https://pkg.go.dev/github.com/samber/do/v2) - [do.samber.dev](https://do.samber.dev) - [github.com/samber/do/v2](https://github.com/samber/do) This skill is not exhaustive — refer to library documentation and code examples for more information: - For Go package docs, symbols, versions, importers, and known vulnerabilities, → See `samber/cc-skills-golang@golang-pkg-go-dev` skill (`godig`), preferred over Context7 for Go package facts. - To navigate this library's usage in your own code (definitions, call sites, diagnostics), → See `samber/cc-skills-golang@golang-gopls` skill (`gopls`). - Context7 remains a fallback for docs not indexed on pkg.go.dev. Install v2 — v1 is superseded and lacks the generics-based container, scopes, and lifecycle hooks documented below, so v1-era guidance misleads on every API in this skill: ```bash go get -u github.com/samber/do/v2 ``` ## Core Concepts ### The Injector (Container) ```go import "github.com/samber/do/v2" injector := do.New() ``` ### Service Types - **Lazy** (default): Created when first requested - **Eager**: Created immediately whe