filesystem

type File interface {
	Close() error
	Readdir(int) ([]os.FileInfo, error)
}

type Filesystem interface {
	// from "os"
	Mkdir(name string, perm os.FileMode) error
	Open(name string) (File, error)
	Stat(name string) (os.FileInfo, error)

	// from "io/ioutil"
	ReadFile(filename string) ([]byte, error)
	WriteFile(filename string, data []byte, perm os.FileMode) error
}