feat(Form): export loading state (#3861)

src/runtime/components/Form.vue

@@ -278,6 +278,7 @@ defineExpose<Form<T>>({
   },
 
   disabled,
+  loading,
   dirty: computed(() => !!dirtyFields.size),
 
   dirtyFields: readonly(dirtyFields) as DeepReadonly<Set<keyof T>>,

src/runtime/types/form.ts

@@ -14,6 +14,7 @@ export interface Form<T extends object> {
   submit (): Promise<void>
   disabled: ComputedRef<boolean>
   dirty: ComputedRef<boolean>
+  loading: Ref<boolean>
 
   dirtyFields: DeepReadonly<Set<keyof T>>
   touchedFields: DeepReadonly<Set<keyof T>>