webpack.config.js

var path = require('path');
var webpack = require('webpack');

// var HtmlWebpackPlugin = require('html-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const HtmlWebpackPluginConfig = new HtmlWebpackPlugin({
  template: './demo/demo.html',
  filename: 'index.html',
  inject: 'body'
});

module.exports = {
  devtool: 'source-map',
  entry: './demo/index.js',
  output: {
    path: path.join(__dirname, 'docs'),
    filename: 'bundle.js'
  },
  plugins: [
    HtmlWebpackPluginConfig,
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin()
  ],
  module: {
    loaders: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        include: __dirname,
        exclude: /node_modules/
      },
      {
        test: /\.css?$/,
        loaders: ['style-loader', 'raw-loader'],
        include: __dirname,
        exclude: /node_modules/
      },
      {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {}
          }
        ]
      }
    ]
  }
};