diff --git a/msbuild/Base128/justfile b/msbuild/Base128/justfile
index 81cd23d..e089a81 100644
--- a/msbuild/Base128/justfile
+++ b/msbuild/Base128/justfile
@@ -2,9 +2,9 @@ git_repo := "https://github.com/Wojmik/Base128.git"
 git_ref := "Version_1.2.2"
 dll_name := "Base128.dll"
 lib_name := "Base128"
-out_dir := invocation_directory() / "build"
 dotnet_framework := "netstandard2.1"
 csproj_relative_path := "Base128" / "Base128.csproj"
+out_dir := invocation_directory() / "build"
 
 working_dir := `mktemp -d`
 repo_dir := working_dir / "repo"
@@ -21,7 +21,7 @@ clean:
 clone:
     git clone --single-branch --branch {{git_ref}} {{git_repo}} {{repo_dir}}
 
-build:
+build: clone
     dotnet build {{csproj_path}} --configuration Release -o {{dotnet_artifact_dir}} --framework {{dotnet_framework}}
 
 assemble_upm: clone build && clean
@@ -29,4 +29,4 @@ assemble_upm: clone build && clean
     cp {{dotnet_artifact_dir / dll_name}} {{upm_contents_dir}}
     cp package.json {{upm_contents_dir}}
     mkdir -p {{out_dir}}
-    tar -cvf {{out_dir / lib_name}}.tgz -C {{upm_contents_dir}} .
+    npm pack --pack-destination {{out_dir}} {{upm_contents_dir}}
diff --git a/msbuild/SimpleBase/justfile b/msbuild/SimpleBase/justfile
index e37b575..991ef57 100644
--- a/msbuild/SimpleBase/justfile
+++ b/msbuild/SimpleBase/justfile
@@ -21,7 +21,7 @@ clean:
 clone:
     git clone --single-branch --branch {{git_ref}} {{git_repo}} {{repo_dir}}
 
-build:
+build: clone
     dotnet build {{csproj_path}} --configuration Release -o {{dotnet_artifact_dir}} --framework {{dotnet_framework}}
 
 assemble_upm: clone build && clean
@@ -29,4 +29,4 @@ assemble_upm: clone build && clean
     cp {{dotnet_artifact_dir / dll_name}} {{upm_contents_dir}}
     cp package.json {{upm_contents_dir}}
     mkdir -p {{out_dir}}
-    tar -cvf {{out_dir / lib_name}}.tgz -C {{upm_contents_dir}} .
+    npm pack --pack-destination {{out_dir}} {{upm_contents_dir}}
diff --git a/nix/devShells.nix b/nix/devShells.nix
index e4fc6ba..8a0179d 100644
--- a/nix/devShells.nix
+++ b/nix/devShells.nix
@@ -14,6 +14,7 @@ in
       dotnet
       just
       nixpkgs-fmt
+      nodejs_23
       roslyn-ls
     ]) ++ pkgs.lib.optional pkgs.stdenv.isDarwin [
       pkgs.libiconv