A full package set is not needed for both node versions. The goal is to
remove the large amount of generated files. Instead only packages which
might be needed in v4 development environments are added to a dedicated
node-packages-v4.json file.
This reverts commit 986dba716f.
Fixes:
error: anonymous function at /home/travis/build/NixOS/nixpkgs/pkgs/development/node-packages/node-env.nix:3:1 called with unexpected argument ‘python’, at /home/travis/build/NixOS/nixpkgs/pkgs/development/node-packages/composition-v6.nix:8:13
This commit is doing a lot more than removing the yarn package, it also
upgrades a ton of other packages.