diff --git a/scripts/check-generated-bindings.mjs b/scripts/check-generated-bindings.mjs
index cda910285..2ca94a959 100644
--- a/scripts/check-generated-bindings.mjs
+++ b/scripts/check-generated-bindings.mjs
@@ -74,8 +74,9 @@ const targets = [
 function snapshot(dir) {
   const absolute = path.join(repoRoot, dir);
   if (!fs.existsSync(absolute)) {
-    console.warn(`目录不存在，跳过校验：${dir}`);
-    return new Map();
+    // 目录不存在时旧实现返回空 Map：若前后快照都为空，diff 什么都不报，这个 target 会以
+    // "0 个文件"静默通过——`export_to` 路径被改名或生成文件被整体删除时，校验形同虚设。
+    throw new Error(`生成绑定目录不存在，无法校验：${dir}`);
   }
   const entries = fs.readdirSync(absolute, { recursive: true });
   return new Map(