How to build a ES6 express app with webpack 2 and babel?

Given the following Webpack 2 configuration, I want to write a express app using ES6. My .babelrc has only the es2015 preset:

const path = require('path');

module.exports = {
  target: 'node',

  entry: path.resolve(__dirname, 'src', 'server.js'),

  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'server.bundle.js',
  },

  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: 'babel-loader',
      },
    ],
  },
};

Running webpack and starting the server work fine, but when accessing the URL through the browser I get the following error:

Error: Cannot find module "."
    at webpackMissingModule (/Users/Me/project/dist/server.bundle.js:18208:74)

I don't know whether it's due to the . in a require('./some/other/file') call (not all files are ES6, so these one use require() instead of import); or maybe some configuration I'm missing.

And also, given that stack trace I can't really map it to the original source file.

Thanks in advance

via Christopher Francisco