with import <nixpkgs> {}; {
  env = stdenv.mkDerivation {
    name = "env";
    buildInputs = [
      elmPackages.elm
      cabal-install
      cabal2nix
      nodejs
      sqlite
      tmux
      tmuxinator
    ];
    shellHook = ''
      tmux kill-session -t sharedCost >/dev/null 2>&1
      firefox http://localhost:3000/
      tmuxinator local
    '';
  };
}