webpack.demo.config.js

var path = require('path');

module.exports = {
  entry: './demo-src/main.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'demo')
  },
  module: {
    rules: [{
      test: /\.js$/,
      exclude: /(node_modules|bower_components)/,
      use: {
        loader: 'babel-loader',
      }
    }]
  }
};