How to use the consolidate.jade function in consolidate

function renderJade(viewFiles, viewModel, callback) {
  var jadeFile = viewFiles[0];

  if (viewFiles.length > 1) {
    console.warn('TEMPLATES: More than one possible Jade view file found, will take main or index.');
    jadeFile = _.find(viewFiles, function (file) {
      return Path.basename(file, Path.extname(file)) === 'main' || Path.basename(file, Path.extname(file)) === 'index';
    });
  }

  if (jadeFile) {
    // Handle exports.
    viewModel.basedir = Path.join(__dirname, '../templates/jade/');
    
    Consolidate.jade(jadeFile, viewModel, function (err, html) {
      if (!err) {
        callback && callback(html);
      }
      else {
        console.error('TEMPLATES: Error generating view from Jade file ' + jadeFile, err);
        callback && callback();
      }
    });
  }
  else {
    console.warn('TEMPLATES: Could not find appropriate main Jade view file, please rename your main template to main.jade or index.jade.');
    callback && callback();
  }
}

path.exists(process.cwd()+"/template"+chemical.page+".jade", function(found){
      if(found)
        cons.jade(process.cwd()+"/template"+chemical.page+".jade", chemical.data || {}, self.render(chemical));
      else
        cons.jade(process.cwd()+"/template/404.jade", chemical.data || {}, self.render(chemical));
    });
  });