# Functions
Glob method calls `filepath.Glob` if fs == nil otherwise VFS.
IsExists method is helper to find existence.
Lstat method calls `os.Lstat` if fs == nil otherwise VFS.
Open method calls `os.Open` if fs == nil otherwise VFS.
ReadDir method calls `ioutil.ReadDir` if fs == nil otherwise VFS.
ReadFile method calls `ioutil.ReadFile` if fs == nil otherwise VFS.
Stat method calls `os.Stat` if fs == nil otherwise VFS.
Walk method calls `filepath.Walk` if fs == nil otherwise VFS.
# Interfaces
File interface returned by a vfs.FileSystem's Open method.
FileSystem interface implements access to a collection of named files.
Gziper interface is to identify whether the file's raw bytes is gzipped or not.
RawBytes interface is to retrieve underlying file's raw bytes.