these 3 derivations will be built:
  /nix/store/v375bgj046qhk89kp0a6y8z9br5q7l6i-dsh-source.drv
  /nix/store/m6n9mxn6dkigdfy4a186bg15q6flsjns-dsh-0.1.5-rc.2-npm-deps.drv
  /nix/store/2pdqskwb5c0n9df5xrz4yinl40qfq36z-dsh-0.1.5-rc.2.drv