Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: jtpio

buildutils/src/utils.ts

@@ -91,7 +91,7 @@ export function pythonVersionToJSVersion(version: string): string {
     .replace(/\.dev(\d+)$/, '-dev.$1');
 
   if (!semver.valid(jsVersion)) {
-    throw new Error(`Invalid JavaScript version: ${version}`);
+    throw new Error(`Invalid JavaScript version: ${jsVersion} (from Python version: ${version})`);
   }
 
   return jsVersion;

pyproject.toml

@@ -125,7 +125,7 @@ build = "make -C docs html SPHINXOPTS='-W'"
 serve = "cd docs/build/html && python -m http.server"
 
 [tool.hatch.envs.default.scripts]
-npm_pack = "node ./buildutils/lib/npm-pack.js"
+npm_pack = "jlpm run build:utils && node ./buildutils/lib/npm-pack.js"
 js_test = "jlpm run build:test && jlpm run test"
 
 [tool.hatch.envs.test]