Webpack ProvidePlugin polyfill guard bug

app.js

console.log(mdl);

module.js

if (typeof mdl === 'undefined') {
  module.exports = { name: 'test' };
} else {
  module.exports = mdl;
}

webpack.config.js

const webpack = require('webpack');

module.exports = {
  output: {
    filename: 'out.js',
  },
  entry: './app.js',
  plugins: [
    new webpack.ProvidePlugin({
      // Changing "mdl:" to anything else will make it work
      mdl: './module.js'
    })
  ]
};