webpack.config.js

const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
  entry: './src/index.js',
  plugins: [
    new ExtractTextPlugin({ filename: 'styles.css', allChunks: true, disable: process.env.NODE_ENV !== 'production' }),
  ],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader'],
      },
      {
        test: /\.scss$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            {
              loader: 'css-loader',
              options: {
                modules: true,
                sourceMap: true,
                importLoaders: 2,
                localIdentName: '[name]__[local]___[hash:base64:5]',
              },
            },
            'sass-loader',
          ],
        }),
      },
    ],
  },
  target: 'electron-renderer',
  resolve: {
    extensions: ['*', '.js', '.jsx'],
  },
  output: {
    path: `${__dirname}/dist`,
    publicPath: '/',
    filename: 'bundle.js',
  },
};