Webpack bundle抛出Uncaught Type错误

Question

我正在尝试将我的开发反应应用程序与webpack捆绑在一起，但生成的捆绑包会抛出错误

Uncaught TypeError: Cannot read property '.js' of undefined

引发此错误的代码是

function hookExtensions(_exts) {
      /*istanbul ignore next*/(0, _each2.default)(oldHandlers, function (old, ext) {
        if (old === undefined) {
          delete (void 0)[ext];
        } else {
          (void 0)[ext] = old;
        }
      });

      oldHandlers = {};

      /*istanbul ignore next*/(0, _each2.default)(_exts, function (ext) {
        oldHandlers[ext] = (void 0)[ext];//error is thrown on this line
        registerExtension(ext);
      });
    }

我的webpack.config.js如下：

'use strict';

const path = require('path');

console.log(__dirname);

let config = {
  target:'electron-renderer',
  entry:'./app/Initializer',
  output:{
    path:path.resolve(__dirname, 'dist'),
    filename: 'appbundle.js',
    publicPath:'/dist/'
  },
  resolve: {
    extensions:["",".js",".jsx",".json"]
  },
  module: {
    loaders:[{
      test: /\.jsx?$/,
      exclude: /node_modules/,
      loader: 'babel-loader'
    },
      {
        test: /\.json/,
        loader: 'json-loader',
      }
    ],
  },
}

module.exports = config;

我可能做错了什么？对此有任何帮助表示赞赏。