Question: What is the purpose of this plugin

[IAMtheIAM]

I saw this being used in angular2-webpack-starter, and I'm trying to understand what the purpose and use case is for this loader? A little explanation would be nice, thanks.

[IAMtheIAM]

Also, every time I run, it hits the error method

catch (e) {
    console.warn('ResolveNgRoutes', filePath)
  }

and file is always undefined.

My plugin

   new ContextReplacementPlugin(
      // The (\\|\/) piece accounts for path separators in *nix and Windows
      /angular(\\|\/)core(\\|\/)(esm(\\|\/)src|src)(\\|\/)linker/,
      helpers.root('./src'),
      resolveNgRoute(helpers.root('./src'))
   ),

Something wrong with it?