Apply suggestions from code review

Co-authored-by: Alois Klink <alois@aloisklink.com>

.esbuild/build.ts

@@ -56,9 +56,7 @@ const handler = (e) => {
 
 const main = async () => {
   await generateLangium();
-  await mkdir('stats').catch(() => {
-    // Ignore error if directory already exists
-  });
+  await mkdir('stats', {recursive: true});
   const packageNames = Object.keys(packageOptions) as (keyof typeof packageOptions)[];
   // it should build `parser` before `mermaid` because it's a dependency
   for (const pkg of packageNames) {