Windows WSL Ubuntu npm webpack CSS error fix

wsl_ubuntu_webpack_error_fix

// When using webpack under WSL Ubuntu the following error will be generated during "npm start":
//
//    Error: EINVAL: invalid argument, "index.css"  (or similar to this)
//
// This is apparently a bug in how Microsoft implemented the Ubuntu subsystem.
//
// The solution is to add the below code to the very top of the webpack config file. (above the imports is fine)
//
// See:  https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/440

try {
  require('os').networkInterfaces();
}
catch (e) {
  require('os').networkInterfaces = () => ({});
}