isDirectory property
      
      bool
      get
      isDirectory
      
    
    
The read-only isDirectory
property of the FileSystemEntry interface is true if the
entry represents a directory (meaning it's a FileSystemDirectoryEntry)
and false if it's not.
You can also use FileSystemEntry.isFile to determine if the entry is a file.
Warning: You should not assume that any entry which isn't a directory is a file or vice versa. There are other types of file descriptors on many operating systems. Be sure to use both
isDirectoryandisFileas needed to ensure that the entry is something you know how to work with.
Implementation
external bool get isDirectory;