src/Viserio/Component/Console/Command/AbstractCommand.php
public function warn(string $string, $verbosityLevel = null): void
    {
        if (! $this->getOutput()->getFormatter()->hasStyle('warning')) {
            $style = new OutputFormatterStyle('yellow');
            $this->getOutput()->getFormatter()->setStyle('warning', $style);
        }

        $this->line($string, 'warning', $verbosityLevel);
    }
public function warn(string $string, $verbosityLevel = null): void
    {
        if (! $this->getOutput()->getFormatter()->hasStyle('warning')) {
            $style = new OutputFormatterStyle('yellow');
            $this->getOutput()->getFormatter()->setStyle('warning', $style);
        }

        $this->line($string, 'warning', $verbosityLevel);
    }
Write a string as warning output.

@param string          $string
@param null|int|string $verbosityLevel

@return void