diff --git a/crates/backend/src/codegen/struct.rs b/crates/backend/src/codegen/struct.rs
index 4e1ef477..a3c431c4 100644
--- a/crates/backend/src/codegen/struct.rs
+++ b/crates/backend/src/codegen/struct.rs
@@ -25,6 +25,26 @@ fn gen_napi_value_map_impl(name: &Ident, to_napi_val_impl: TokenStream) -> Token
       }
     }
 
+    impl napi::bindgen_prelude::TypeName for &#name {
+      fn type_name() -> &'static str {
+        #name_str
+      }
+
+      fn value_type() -> napi::ValueType {
+        napi::ValueType::Object
+      }
+    }
+
+    impl napi::bindgen_prelude::TypeName for &mut #name {
+      fn type_name() -> &'static str {
+        #name_str
+      }
+
+      fn value_type() -> napi::ValueType {
+        napi::ValueType::Object
+      }
+    }
+
     #to_napi_val_impl
 
     impl napi::bindgen_prelude::FromNapiRef for #name {
@@ -60,6 +80,36 @@ fn gen_napi_value_map_impl(name: &Ident, to_napi_val_impl: TokenStream) -> Token
         Ok(&mut *(wrapped_val as *mut #name))
       }
     }
+
+    impl napi::bindgen_prelude::FromNapiValue for &#name {
+      unsafe fn from_napi_value(
+        env: napi::bindgen_prelude::sys::napi_env,
+        napi_val: napi::bindgen_prelude::sys::napi_value
+      ) -> napi::bindgen_prelude::Result<Self> {
+        napi::bindgen_prelude::FromNapiRef::from_napi_ref(env, napi_val)
+      }
+    }
+
+    impl napi::bindgen_prelude::FromNapiValue for &mut #name {
+      unsafe fn from_napi_value(
+        env: napi::bindgen_prelude::sys::napi_env,
+        napi_val: napi::bindgen_prelude::sys::napi_value
+      ) -> napi::bindgen_prelude::Result<Self> {
+        napi::bindgen_prelude::FromNapiMutRef::from_napi_mut_ref(env, napi_val)
+      }
+    }
+
+    impl napi::NapiRaw for &#name {
+      unsafe fn raw(&self) -> napi::sys::napi_value {
+        unreachable!()
+      }
+    }
+
+    impl napi::NapiRaw for &mut #name {
+      unsafe fn raw(&self) -> napi::sys::napi_value {
+        unreachable!()
+      }
+    }
   }
 }
 
diff --git a/examples/napi/__test__/typegen.spec.ts.md b/examples/napi/__test__/typegen.spec.ts.md
index 55b92aca..25d3615b 100644
--- a/examples/napi/__test__/typegen.spec.ts.md
+++ b/examples/napi/__test__/typegen.spec.ts.md
@@ -40,6 +40,8 @@ Generated by [AVA](https://avajs.dev).
       v: string | number␊
     }␊
     export function either4(input: string | number | boolean | Obj): number␊
+    export function receiveClassOrNumber(either: number | JsClassForEither): number␊
+    export function receiveMutClassOrNumber(either: number | JsClassForEither): number␊
     /** default enum values are continuos i32s start from 0 */␊
     export const enum Kind {␊
       /** Barks */␊
@@ -200,6 +202,9 @@ Generated by [AVA](https://avajs.dev).
       static withName(name: string): ClassWithFactory␊
       setName(name: string): this␊
     }␊
+    export class JsClassForEither {␊
+      constructor()␊
+    }␊
     export namespace xxh3 {␊
       export const ALIGNMENT: number␊
       export function xxh3_64(input: Buffer): BigInt␊
diff --git a/examples/napi/__test__/typegen.spec.ts.snap b/examples/napi/__test__/typegen.spec.ts.snap
index 36b7e036..a929b2b0 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 395f0719..6e065d42 100644
--- a/examples/napi/__test__/values.spec.ts
+++ b/examples/napi/__test__/values.spec.ts
@@ -73,6 +73,9 @@ import {
   Bird,
   Assets,
   receiveStrictObject,
+  receiveClassOrNumber,
+  JsClassForEither,
+  receiveMutClassOrNumber,
 } from '../'
 
 test('export const', (t) => {
@@ -320,6 +323,13 @@ test('return either', (t) => {
   t.is(returnEither(42), '42')
 })
 
+test('receive class reference in either', (t) => {
+  const c = new JsClassForEither()
+  t.is(receiveClassOrNumber(1), 2)
+  t.is(receiveClassOrNumber(c), 100)
+  t.is(receiveMutClassOrNumber(c), 100)
+})
+
 test('either3', (t) => {
   t.is(either3(2), 2)
   t.is(either3('hello'), 'hello'.length)
diff --git a/examples/napi/index.d.ts b/examples/napi/index.d.ts
index cd2e9b02..31d68233 100644
--- a/examples/napi/index.d.ts
+++ b/examples/napi/index.d.ts
@@ -30,6 +30,8 @@ export interface Obj {
   v: string | number
 }
 export function either4(input: string | number | boolean | Obj): number
+export function receiveClassOrNumber(either: number | JsClassForEither): number
+export function receiveMutClassOrNumber(either: number | JsClassForEither): number
 /** default enum values are continuos i32s start from 0 */
 export const enum Kind {
   /** Barks */
@@ -190,6 +192,9 @@ export class ClassWithFactory {
   static withName(name: string): ClassWithFactory
   setName(name: string): this
 }
+export class JsClassForEither {
+  constructor()
+}
 export namespace xxh3 {
   export const ALIGNMENT: number
   export function xxh3_64(input: Buffer): BigInt
diff --git a/examples/napi/src/either.rs b/examples/napi/src/either.rs
index 12ddccdc..175de708 100644
--- a/examples/napi/src/either.rs
+++ b/examples/napi/src/either.rs
@@ -55,3 +55,30 @@ fn either4(input: Either4<String, u32, bool, Obj>) -> u32 {
     },
   }
 }
+
+#[napi]
+struct JsClassForEither {}
+
+#[napi]
+impl JsClassForEither {
+  #[napi(constructor)]
+  pub fn new() -> Self {
+    JsClassForEither {}
+  }
+}
+
+#[napi]
+fn receive_class_or_number(either: Either<u32, &JsClassForEither>) -> u32 {
+  match either {
+    Either::A(n) => n + 1,
+    Either::B(_) => 100,
+  }
+}
+
+#[napi]
+fn receive_mut_class_or_number(either: Either<u32, &mut JsClassForEither>) -> u32 {
+  match either {
+    Either::A(n) => n + 1,
+    Either::B(_) => 100,
+  }
+}