diff --git a/examples/napi/__test__/typegen.spec.ts.md b/examples/napi/__test__/typegen.spec.ts.md
index aebed60f..31303f56 100644
--- a/examples/napi/__test__/typegen.spec.ts.md
+++ b/examples/napi/__test__/typegen.spec.ts.md
@@ -97,6 +97,7 @@ Generated by [AVA](https://avajs.dev).
     export class ClassWithFactory {␊
       name: string␊
       static withName(name: string): ClassWithFactory␊
+      setName(name: string): this␊
     }␊
     export namespace xxh3 {␊
       export const ALIGNMENT: number␊
diff --git a/examples/napi/__test__/typegen.spec.ts.snap b/examples/napi/__test__/typegen.spec.ts.snap
index 82a6b45b..1357fa79 100644
Binary files a/examples/napi/__test__/typegen.spec.ts.snap and b/examples/napi/__test__/typegen.spec.ts.snap differ
diff --git a/examples/napi/__test__/values.spec.ts b/examples/napi/__test__/values.spec.ts
index fa6a3e23..ecd626a0 100644
--- a/examples/napi/__test__/values.spec.ts
+++ b/examples/napi/__test__/values.spec.ts
@@ -112,6 +112,10 @@ test('class factory', (t) => {
   const duck = ClassWithFactory.withName('Default')
   t.is(duck.name, 'Default')
 
+  const ret = duck.setName('D')
+  t.is(ret.name, 'D')
+  t.is(ret, duck)
+
   duck.name = '周黑鸭'
   t.is(duck.name, '周黑鸭')
 
diff --git a/examples/napi/index.d.ts b/examples/napi/index.d.ts
index 93e7c921..d9afc5fd 100644
--- a/examples/napi/index.d.ts
+++ b/examples/napi/index.d.ts
@@ -87,6 +87,7 @@ export class Context {
 export class ClassWithFactory {
   name: string
   static withName(name: string): ClassWithFactory
+  setName(name: string): this
 }
 export namespace xxh3 {
   export const ALIGNMENT: number
diff --git a/examples/napi/src/class_factory.rs b/examples/napi/src/class_factory.rs
index 116f9772..50daac52 100644
--- a/examples/napi/src/class_factory.rs
+++ b/examples/napi/src/class_factory.rs
@@ -9,4 +9,10 @@ impl ClassWithFactory {
   pub fn with_name(name: String) -> Self {
     Self { name }
   }
+
+  #[napi]
+  pub fn set_name(&mut self, name: String) -> &Self {
+    self.name = name;
+    self
+  }
 }