these 4 derivations will be built:
  /nix/store/35wv08170zbf5j3vwjzx1g22dq2br2n3-dsh-source.drv
  /nix/store/63p0jvh0xpw0zw3v7kha5k1466rp8qvz-dsh-0.1.5-rc.3-npm-deps.drv
  /nix/store/rnq3zp45idh1lwivaicgvhl2wbj1c87m-dsh-0.1.5-rc.3.drv
  /nix/store/6anvxm5wn39wr2l2y5hclpj6f4a5qim7-check-dsh.drv