{
  channelsNixosStable = {
    ref = "nixos-18.09";
    rev = "97e0d53d669cd07f0750a42fd535524b3cdd46d1";
  };
  channelsNixosUnstable = {
    ref = "nixos-unstable";
    rev = "be445a9074f139d63e704fa82610d25456562c3d";
  };
}