react中的next.js，安装css和less

npm install  @zeit/next-css --save
npm install --save @zeit/next-less less

next.config.js

const withCss = require('@zeit/next-css');
const withLess = require('@zeit/next-less');
// fix: prevents error when .css files are required by node
if (typeof require !== 'undefined') {
  // eslint-disable-next-line
  //console.log("require",require);
  require.extensions['.css','.less'] = (file) => {}
}
 module.exports = withLess(withCss());