parcel-bundler/src/builtins/index.js

<p align="center"> <a href="https://parceljs.org/" target="_blank"> <img alt="Parcel" src="https://user-images.githubusercontent.com/19409/31321658-f6aed0f2-ac3d-11e7-8100-1587e676e0ec.png" width="749"> </a> </p>

var builtins = require('node-libs-browser');

for (var key in builtins) {
  if (builtins[key] == null) {
    builtins[key] = require.resolve('./_empty.js');
  }
}

builtins['_bundle_loader'] = require.resolve('./bundle-loader.js');
builtins['_css_loader'] = require.resolve('./css-loader.js');

module.exports = builtins;