fix(form): non-null predict for rulesRef (#4643)

ylc395 · web-flow · commit 752642afaf48 · 2021-09-11T21:01:11.000+08:00
diff --git a/components/form/useForm.ts b/components/form/useForm.ts
@@ -122,7 +122,7 @@ function useForm(
   const validateInfos = reactive<validateInfos>({});
 
   const rulesKeys = computed(() => {
-    return Object.keys(unref(rulesRef));
+    return rulesRef ? Object.keys(unref(rulesRef)) : [];
   });
 
   watch(
