webpack.config.js

var path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: 'index.js',
    library: 'ReactSpritz',
    libraryTarget: 'umd',
    umdNamedDefine: true
  },
  module: {
    rules: [
      {
        test: /(\.jsx|\.js)$/,
        loader: 'babel-loader',
        exclude: /(node_modules)/
      },
      {
        test: /\.scss$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            'css-loader',
            'sass-loader',
          ],
        }),
      }],
  },
  plugins: [
    new CleanWebpackPlugin(['build']),
    new UglifyJSPlugin(),
    new ExtractTextPlugin({
      filename: "[name].css",
    }),
  ],
  externals: {
    'react': 'react',
    'react-dom': 'react-dom',
    'prop-types': 'prop-types'
  }
};