Merge pull request #320578 from philiptaron/issue-301014/pkgs-yarn2nix

    });

  yarn2nix = mkYarnPackage {

    src =

      let

        src = ./.;

        mkFilter = { dirsToInclude, filesToInclude, root }: path: type:

          let

            inherit (lib) elem elemAt splitString;

            subpath = elemAt (splitString "${toString root}/" path) 1;

            spdir = elemAt (splitString "/" subpath) 0;

          in elem spdir dirsToInclude ||

            (type == "regular" && elem subpath filesToInclude);

      in builtins.filterSource

          (mkFilter {

            dirsToInclude = ["bin" "lib"];

            filesToInclude = ["package.json" "yarn.lock"];

            root = src;

          })

          src;

    src = lib.fileset.toSource {

      root = ./.;

      fileset = lib.fileset.unions [

        ./bin

        ./lib

        ./package.json

        ./yarn.lock

      ];

    };

    # yarn2nix is the only package that requires the yarnNix option.

    # All the other projects can auto-generate that file.