Go (programming language), elegant codebases

HashiCorp has a good reputation of having elegant Go codebases. Supposedly spf13 writes very elegant Go projects too (I've yet to check for myself, but his credentials are impressive).

More examples, from a post by /u/SonOfMotherDuck:

• https://github.com/pkg/errors - errors with stack traces
• https://github.com/go-chi/chi - http router
• https://github.com/ent/ent - type safe ORM
• https://github.com/knadh/koanf - config management
• https://github.com/jessevdk/go-flags - struct based flag parsing
• https://github.com/etcd-io/bbolt - in-memory key/value store
• https://github.com/hashicorp/consul - distributed key/value store
• https://github.com/etcd-io/etcd - distributed key/value store
• https://github.com/hashicorp/vault - secret management server
• https://github.com/mozilla/sops - serverless secret management
• https://github.com/ory/hydra - extensible OIDC provider
• https://github.com/ory/kratos - generic user management
• https://github.com/goharbor/harbor - docker registry
• https://github.com/rancher/rancher - container management platform
• https://github.com/ethereum/go-ethereum - ethereum client
• https://github.com/slackhq/nebula - peer to peer networking overlay