public function debug( $css, $scss, $filename ) {

		$debug_dir = $this->pathToDebugDir();

		$css_debug_file = $debug_dir . "/{$filename}.css";
		\Pressbooks\Utility\put_contents( $css_debug_file, $css );

		$scss_debug_file = $debug_dir . "/{$filename}.scss";
		\Pressbooks\Utility\put_contents( $scss_debug_file, $scss );
	}