scss webpack issue

webpack.js

// webpack.config.js

const productionConfig = () => merge([
  parts.extractSCSS({
    use: [
      {
        loader: 'css-loader',
        module: true
      }, {
        loader: 'sass-loader',
      },
    ],
  }),
]);

//webpack.parts.js
const ExtractTextPlugin = require('extract-text-webpack-plugin');

exports.extractSCSS = ({ include, exclude, use }) => {
  const plugin = new ExtractTextPlugin({
    filename: '[name].[contenthash].css',
    disable: process.env.NODE_ENV === 'development',
  });

  return {
    module: {
      rules: [
        {
          test: /\.scss$/,
          include,
          exclude,
          use: plugin.extract({
            use,
            fallback: 'style-loader',
          }),
        },
      ],
    },
    plugins: [plugin],
  };
};

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