{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/refs/tags/20.09.tar.gz") {} }:

let
  lib = import <nixpkgs/lib>;
  buildNodeJs = pkgs.callPackage "${pkgs.path}/pkgs/development/web/nodejs/nodejs.nix" {
    python = pkgs.python27Full;
  };

  nodejsVersion = lib.fileContents ./.nvmrc;

  nodejs = buildNodeJs {
    enableNpm = true;
    version = nodejsVersion;
    sha256 = "032801kg24j04xmf09m0vxzlcz86sv21s24lv9l4cfv08k1c4byp";
  };

  NPM_CONFIG_PREFIX = toString ./npm_config_prefix;

in pkgs.mkShell {
  packages = with pkgs; [
    nodejs
    nodePackages."@angular/cli"
  ];

  inherit NPM_CONFIG_PREFIX;

  shellHook = ''
    export PATH="${NPM_CONFIG_PREFIX}/bin:$PATH"
    echo "Node version: $(node --version)"
  '';
}