webpack config for searchkit history error

webpack.config.js

var webpack = require('webpack');

/*
 * Default webpack configuration for development
 */
var config = {
  devtool: 'eval-source-map',
  entry: [ __dirname + "/app/App.js", 'bootstrap-loader'],
  output: {
    path: __dirname + "/public",
    filename: "bundle.js"
  },
  module: {
    loaders: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: 'babel',
        query: {
          presets: ['es2015','react']
        }
      },
      {
        test: /\.scss$/,
        loaders: ["style", "css", "sass"]
      },
      {
        test: /\.css$/, // Only .css files
        loader: 'style!css' // Run both loaders
      },
      { test: /\.(woff2?|svg)$/, loader: 'url?limit=10000' },
      { test: /\.(ttf|eot)$/, loader: 'file' },
    ]
  },
  devServer: {
    contentBase: "./public",
    colors: true,
    historyApiFallback: true,
    inline: true
  },
}

/*
 * If bundling for production, optimize output
 */
if (process.env.NODE_ENV === 'production') {
  config.devtool = false;
  config.plugins = [
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({comments: false}),
    new webpack.DefinePlugin({
      'process.env': {NODE_ENV: JSON.stringify('production')}
    })
  ];
};

module.exports = config;