these 4 derivations will be built:
  /nix/store/9whmsr029x9ax328hmyp9n1zipam5rlj-dsh-source.drv
  /nix/store/xyvh68hhvsx1fagbv2s0mj8cjfd1qyvb-dsh-0.2.0-rc.2-npm-deps.drv
  /nix/store/jsjbrnbbkz0k9mrqkpw3zq5wrnf9q749-dsh-0.2.0-rc.2.drv
  /nix/store/181wfgn6csx3ijcbxni6jl2j3dn0qhj4-check-dsh.drv