code: public static void preprocess(String absolutePath) {
          if (absolutePath == null) {
              return;
          }
  
          if (config == null) {
              System.setProperty(Key.APPLICATION_CONFIG.toString(), basePath + Default.CONFIG_PATH.toString());
              config = new Config();
          }
  
          if (config.isApplicationPreprocessLess() && absolutePath.endsWith(LESS)) {
              lessify(new File(absolutePath));
          } else if (config.isApplicationPreprocessSass() && absolutePath.endsWith(SASS)) {
              sassify(new File(absolutePath));
          }
      }
docs: Compiles a LESS or SASS file to a corresponding CSS file
  
  @param absolutePath The absolute path to the file