yarn

type Child struct {
	Name     string
	Color    string
	Children []Child
}

type Data struct {
	Trees []Child
}

type Output struct {
	Data Data
}

type SystemYarn struct {
	Cmd string
}

type YarnTool interface {
	// TODO: implement yarn list --production --frozen-lockfile. Skipping for now because the implementation relies 100% on yarn.lock
	// List(dir string) error
	Install(dir string) error
	// Exists returns true if yarn is available
	Exists() bool
	// List returns a dependency graph.
	List(target string, devDependencies bool) (graph.Deps, error)
}