A mini isomorphic Haskell webdev environment

isoenv.nix

{ pkgs ? import <nixpkgs> {}, repo ? import <repo> {} }: # Make sure <repo> is defined in your 
let                                                      # $NIX_PATH and pointing to a clone of:
                                                         # github.com/NixOS/nixpkgs
  stdenv = pkgs.stdenv;
 
  ghcp = repo.haskell-ng.packages;
  
  ghc710 = ghcp.ghc7101;
  ghcjs  = ghcp.ghcjs;
 
  hsEnv = ghc710.ghcWithPackages (hs: with hs; ([
    # Server side deps go here
    ] ++ hsIso ));
  hsJsEnv = ghcjs.ghcWithPackages (hs: with hs; ([
    # Client side deps go here
    ] ++ hsIso ));
  hsIso = with ghc710; with ghcjs; [
    # Isomorphic deps go here
    ];
 
in rec {
  app = stdenv.mkDerivation {
    name = "app";
    src = ./.;
    buildInputs = with pkgs; [
      hsEnv
      hsJsEnv
      ];
    PORT = "8888";
    installPhase = ''
      # install steps go here
    '';
  };
}