diff --git a/.esbuild/util.ts b/.esbuild/util.ts
index 4027cd3cf..29e16aa93 100644
--- a/.esbuild/util.ts
+++ b/.esbuild/util.ts
@@ -47,8 +47,7 @@ const getFileName = (
 ) => {
   if (core) {
     fileName += '.core';
-  }
-  if (format === 'esm') {
+  } else if (format === 'esm') {
     fileName += '.esm';
   }
   if (!includeLargeDiagrams) {
diff --git a/cSpell.json b/cSpell.json
index 727a41bc9..76ce8c52f 100644
--- a/cSpell.json
+++ b/cSpell.json
@@ -94,6 +94,7 @@
     "nikolay",
     "nirname",
     "orlandoni",
+    "outdir",
     "pathe",
     "pbrolin",
     "phpbb",
diff --git a/packages/mermaid-zenuml/package.json b/packages/mermaid-zenuml/package.json
index b907e2cba..913cc708e 100644
--- a/packages/mermaid-zenuml/package.json
+++ b/packages/mermaid-zenuml/package.json
@@ -19,6 +19,7 @@
     "mermaid"
   ],
   "scripts": {
+    "clean": "rimraf dist",
     "prepublishOnly": "pnpm -w run build"
   },
   "repository": {