protected function getPipelineDirectories()
	{
		// Parse configured groups
		$config = $this->config->get('assets', []);
		$groups = (isset($config['default'])) ? $config : ['default' => $config];
		if( ! is_null($group = $this->option('group')))
			$groups = array_only($groups, $group);

		// Parse pipeline directories of each group
		$directories = [];
		foreach($groups as $group => $config)
		{
			$pipelineDir = (isset($config['pipeline_dir'])) ? $config['pipeline_dir'] : 'min';
			$publicDir = (isset($config['public_dir'])) ? $config['public_dir'] : public_path();
			$publicDir = rtrim($publicDir, DIRECTORY_SEPARATOR);

			$cssDir = (isset($config['css_dir'])) ? $config['css_dir'] : 'css';
			$directories[] = implode(DIRECTORY_SEPARATOR, [$publicDir, $cssDir, $pipelineDir]);

			$jsDir = (isset($config['js_dir'])) ? $config['js_dir'] : 'js';
			$directories[] = implode(DIRECTORY_SEPARATOR, [$publicDir, $jsDir, $pipelineDir]);
		}

		// Clean results
		$directories = array_unique($directories);
		sort($directories);

		return $directories;
	}