Nix + bun install

bun-node-modules.nix

     {
     packageLock = builtins.fromJSON (builtins.readFile ./package-lock.json);

      cleanPackages = builtins.attrValues (builtins.removeAttrs packageLock.packages [ "" ]);

      fetchedPackages = builtins.map
        (package:

          let
            basename = builtins.baseNameOf package.resolved;
            downloaded = pkgs.fetchurl {
              url = package.resolved;
              sha512 = package.integrity;
              # downloadToTemp = true;
              # postFetch = ''
              #   ls -la
              #   resolved=$(echo ${package.resolved} | sed 's|https://||')
              #   resolved_dir=$(dirname $resolved)
              #   mkdir -p $out/$resolved_dir
              #   cp $downloadedFile $out/$resolved
              # '';
            };
          in
          pkgs.runCommandNoCC "fetchedPackages-${basename}" { } ''
            resolved=$(echo ${package.resolved} | sed 's|https://||')
            resolved_dir=$(dirname $resolved)
            mkdir -p $out/$resolved_dir
            ln -s ${downloaded} $out/$resolved_dir/${basename}
          ''

        )
        cleanPackages;

      joinedPackages = pkgs.symlinkJoin {
        name = "joinedPackages";
        paths = fetchedPackages;
      };

      nodeModules = pkgs.runCommandNoCC "bunNodeModules" { } ''
        ln -s ${joinedPackages}/* .

        cp ${./package-lock.json} ./package-lock.json
        sed -i "s|https://registry.npmjs.org|http://localhost:8080|g" package-lock.json
        cp ${./package.json} ./package.json
        ls ./registry.npmjs.org/@aws-crypto/crc32/-/crc32-5.2.0.tgz

        timeout 10 ${pkgs.static-server}/bin/static-server ./registry.npmjs.org &

        chmod -R 777 .

        ${bun}/bin/bun install --backend copyfile
        ls
        mkdir -p $out
        mv node_modules/* $out
        chmod -R 777 $out/*
      '';

}