supply

type Command interface {
	Execute(string, io.Writer, io.Writer, string, ...string) error
}

type Manifest interface {
	AllDependencyVersions(string) []string
	DefaultVersion(string) (libbuildpack.Dependency, error)
	InstallDependency(libbuildpack.Dependency, string) error
	InstallOnlyVersion(string, string) error
}

type NPM interface {
	Build(string, string) error
	Rebuild(string) error
}

type Stager interface {
	BuildDir() string
	CacheDir() string
	DepDir() string
	DepsIdx() string
	LinkDirectoryInDepDir(string, string) error
	WriteEnvFile(string, string) error
	WriteProfileD(string, string) error
	SetStagingEnvironment() error
}

type Supplier struct {
	Stager             Stager
	Manifest           Manifest
	Log                *libbuildpack.Logger
	Logfile            *os.File
	Command            Command
	NodeVersion        string
	YarnVersion        string
	NPMVersion         string
	PreBuild           string
	StartScript        string
	HasDevDependencies bool
	PostBuild          string
	UseYarn            bool
	NPMRebuild         bool
	Yarn               Yarn
	NPM                NPM
}

type Yarn interface {
	Build(string, string, string) error
}