these 4 derivations will be built:
  /nix/store/051iidgqwfxzgjcpqrgg9dzlj2nkbrps-dsh-source.drv
  /nix/store/qyswxppaik4irn0sbmbyy1vmd22v20rk-dsh-0.2.1-rc.5-npm-deps.drv
  /nix/store/qjh1xm9yd6h1vr4z5wlhxnisn0m2v7p7-dsh-0.2.1-rc.5.drv
  /nix/store/mynva7pgc26l88sc601mah59xzqyq0bm-check-dsh.drv