| exports.isatty = function () { return false; }; | 
|   | 
| function ReadStream() { | 
|   throw new Error('tty.ReadStream is not implemented'); | 
| } | 
| exports.ReadStream = ReadStream; | 
|   | 
| function WriteStream() { | 
|   throw new Error('tty.ReadStream is not implemented'); | 
| } | 
| exports.WriteStream = WriteStream; |