redux-devtools/extension/examples/counter/webpack.config.js

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

module.exports = {
  mode: 'development',
  devtool: 'source-map',
  entry: ['webpack-hot-middleware/client', './index'],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/static/',
  },
  plugins: [new webpack.HotModuleReplacementPlugin()],
  module: {
    rules: [
      {
        test: /\.js$/,
        loaders: ['babel-loader'],
        exclude: /node_modules/,
      },
    ],
  },
};