src/Output/Output.php
public function writelnIfDebug($message)
	{
		if ($this->debug)
		{
			$this->debugMessages[] = new Message(Output::DEBUG, $message, null);
		}
	}
public function writelnIfDebug($message)
	{
		if ($this->debug)
		{
			$this->debugMessages[] = new Message(Output::DEBUG, $message, null);
		}
	}
Write a message to the output, but only if Debug is enabled.

@param $message string|array $messages The message as an array of lines of a single string

@throws \InvalidArgumentException When unknown output type is given