class RoboFile extends \Robo\Tasks
{
    use \Robo\Task\ILess\loadTasks;

    public function less()
    {
        $this->taskCompileLess()
            ->paths([
                'some/path/to/css.css' => 'some/path/to/less.less',
                'some/path/to/css2.css' => 'some/path/to/less2.less',
            ])
            ->run();
    }
}