lockfile

type DependencyPatch struct {
	Pkg         resolve.PackageKey
	OrigVersion string
	NewVersion  string
}

type LockfileIO interface {
	// System returns which ecosystem this LockfileIO is for.
	System() resolve.System
	// Read parses a lockfile into a resolved graph
	Read(file lockfile.DepFile) (*resolve.Graph, error)
	// Write applies the DependencyPatches to the lockfile, with minimal changes to the file.
	// `original` is the original lockfile to read from. The updated lockfile is written to `output`.
	Write(original lockfile.DepFile, output io.Writer, patches []DependencyPatch) error
}

type NpmLockfileIO struct{}