Uncaught SyntaxError: missing ) after argument list  #1125

const webpack = require('webpack');
const path = require('path');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const WebpackNotifierPlugin = require('webpack-notifier');
const dllManifest = require('./wwwroot/vendor-manifest.json');

const bundleOutputDir = './wwwroot';

module.exports = (env) => {
  const isDevBuild = !(env && env.prod);
  const NODE_ENV = isDevBuild ? 'development' : 'production';

  // eslint-disable-next-line no-console
  console.log(`Run webpack with NODE_ENV=${NODE_ENV}`);

  const extractCSS = new ExtractTextPlugin('site.css');
  return [{
    cache: isDevBuild,
    resolve: { extensions: ['.js', '.jsx'] },
    entry: { main: './app/index' },
    output: {
      path: path.join(__dirname, bundleOutputDir),
      filename: '[name].js',
      publicPath: '/'
    },
    module: {
      rules: [{
        enforce: 'pre',
        test: /\.(js|jsx)?$/,
        exclude: /node_modules/,
        loader: 'eslint-loader',
        options: {
          failOnError: true
        }
      }, {
        test: /\.(js|jsx)?$/,
        use: 'babel-loader',
        exclude: /node_modules/
      }, {
        test: /\.css$/,
        use: isDevBuild ? ['style-loader', {
          loader: 'css-loader',
          options: {
            importLoaders: 1
          }
        }, 'postcss-loader'] : ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [{
            loader: 'css-loader?minimize',
            options: {
              importLoaders: 1
            }
          }, 'postcss-loader']
        })
      }, {
        test: /\.(png|jpg|jpeg|gif|svg)$/,
        use: 'url-loader?limit=25000'
      }, {
        test: /\.html$/,
        use: 'file-loader?name=[name].[ext]&outputPath=/'
      }]
    },
    plugins: [
      new WebpackNotifierPlugin(),
      new webpack.DefinePlugin({
        'process.env': {
          ENV: JSON.stringify(NODE_ENV),
          NODE_ENV: JSON.stringify(NODE_ENV)
        }
      }),
      new webpack.DllReferencePlugin({
        context: __dirname,
        manifest: dllManifest
      })

    ].concat(isDevBuild ? [
      new webpack.HotModuleReplacementPlugin(),
      new webpack.NamedModulesPlugin(),
      new webpack.SourceMapDevToolPlugin({
        filename: '[file].map',
        moduleFilenameTemplate: path.relative(bundleOutputDir, '[resourcePath]')
      })
    ] : [
      extractCSS,
      new webpack.optimize.UglifyJsPlugin({
        ie8: false,
        warnings: false,
        mangle: {
          screw_ie8: true,
          keep_fnames: true
        },
        compress: {
          screw_ie8: true,
          warnings: false
        }
      })
    ])
  }];
};