golang-samber-do

1**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.
2 
3# Using samber/do for Dependency Injection in Go
4 
5Type-safe dependency injection toolkit for Go based on Go 1.18+ generics.
6 
7**Official Resources:**
8 
9- [pkg.go.dev/github.com/samber/do/v2](https://pkg.go.dev/github.com/samber/do/v2)
10- [do.samber.dev](https://do.samber.dev)
11- [github.com/samber/do/v2](https://github.com/samber/do)
12 
13This skill is not exhaustive — refer to library documentation and code examples for more information:
14 
15- 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.
16- To navigate this library's usage in your own code (definitions, call sites, diagnostics), → See `samber/cc-skills-golang@golang-gopls` skill (`gopls`).
17- Context7 remains a fallback for docs not indexed on pkg.go.dev.
18 
19Install v2 — v1 is superseded and lacks the generics-based container, scopes, and lifecycle hooks documented below, so v1-era guidance misleads on every API in this skill:
20 
21```bash
22go get -u github.com/samber/do/v2
23```
24 
25## Core Concepts
26 
27### The Injector (Container)
28 
29```go
30import "github.com/samber/do/v2"
31 
32injector := do.New()
33```
34 
35### Service Types
36 
37- **Lazy** (default): Created when first requested
38…