text: module.exports =
    (pluginOptions = {}) =>
    (nextConfig = {}) => {
      const extension = pluginOptions.extension || /\.mdx$/
  
      return Object.assign({}, nextConfig, {
        webpack(config, options) {
          config.module.rules.push({
            test: extension,
            use: [
              options.defaultLoaders.babel,
              {
                loader: require.resolve('@mdx-js/loader'),
                options: pluginOptions.options,
              },
            ],
          })
  
          if (typeof nextConfig.webpack === 'function') {
            return nextConfig.webpack(config, options)
          }
  
          return config
        },
      })
    }
  