redundant extend
redundant extend

I noticed the same line twice and I figured it was a simple mistake you've looked over. Not that it would break anything but it seemed redundant to me
joecohens/laravel-elixir-webpack,CasperLaiTW/laravel-elixir-webpack,izziaraffaele/laravel-elixir-webpack,vanderlin/laravel-elixir-webpack