Namespace Symfony\Component\Console\Output
| ConsoleOutput | ConsoleOutput is the default class for all CLI output. It uses STDOUT. |
| NullOutput | NullOutput suppresses all output. |
| Output | Base class for output classes. |
| StreamOutput | StreamOutput writes the output to a given stream. |
| ConsoleOutputInterface | ConsoleOutputInterface is the interface implemented by ConsoleOutput class. This adds information about stderr output stream. |
| OutputInterface | OutputInterface is the interface implemented by all Output classes. |