| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| errors | Package errors implements functions to manipulate errors. |
| github.com/distribution/reference | Package reference provides a general type to represent any way of referencing images within the registry. |
| github.com/moby/buildkit/exporter | |
| github.com/moby/buildkit/exporter/containerimage/exptypes | |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |