{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
  name = "node-environment";
  buildInputs = with pkgs; [
    nodejs
  ];
  shellHook = ''
    mkdir -p .npm
    if [ -s global_packages.txt ]; then
      cat global_packages.txt | xargs npm install -g --prefix $PWD/.npm
    fi
    if [ -s package.json ]; then
      npm install
    fi
    export PATH=$PWD/.npm/bin:$PATH
  '';
}