webpack4: Cannot read property ‘fileLoader’ of undefined

module.exports = {
  entry: {
    dashboard: ['babel-polyfill', './js/dashboard-dev.js'],
  },

  output: {
    path: path.join(__dirname, '/out'),
    filename: '[name].entry.js',
    publicPath: 'out/',
  },

  module: {
    rules: [
      {
        test: /\.js$/,
        exclude,
        use: [
          {
            loader: 'babel-loader',
          },
        ],
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
          },
        ],
      },
      {
        test: /\.(ttf|eot|svg|gif|jpg|png|woff|woff2)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 10000,
            },
          },
        ],
      },
      {
        test: /\.html$/,
        use: [
          {
            loader: 'ngtemplate-loader',
            options: {
              relativeTo: path.resolve(__dirname, './js'),
            },
          },
          {
            loader: 'html-loader',
          },
        ],
      },
    ],
  },

  plugins: [
    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
    new webpack.optimize.SplitChunksPlugin({
      filename: 'commons.js',
      name: 'commons',
    }),
    new webpack.ProvidePlugin({
      Promise: 'bluebird',
    }),
    new StatsPlugin('stats.json'),
  ],

  devtool: 'source-map',
};