code: function generateLoaders(loader, loaderOptions) {
      const loaders = [ cssLoader ];
      if (loader) {
        loaders.push({
          loader: loader + '-loader',
          options: Object.assign({}, loaderOptions, {
            sourceMap: options.sourceMap,
          }),
        });
      }
  
      // Extract CSS when that option is specified
      // (which is the case during production build)
      if (options.extract) {
        return [ MiniCssExtractPlugin.loader ].concat(loaders);
      }
      return [ 'vue-style-loader' ].concat(loaders);
    }
docs: generate loader string to be used with extract text plugin