Test 2 attributes

example/src/lib.rs

@@ -102,6 +102,6 @@ enum InlineComplexEnum {
 #[serde(rename_all = "camelCase")]
 #[ts(export)]
 struct ComplexStruct {
-    #[serde(default)]
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub string_tree: Option<Rc<BTreeSet<String>>>,
 }