fix(napi-derive): unsound behavior while using reference and async together

examples/napi/__test__/typegen.spec.ts.md

@@ -247,6 +247,7 @@ Generated by [AVA](https://avajs.dev).
       name: string␊
       constructor(name: string)␊
       getCount(): number␊
+      getNameAsync(): Promise<string>␊
     }␊
     export type Blake2bHasher = Blake2BHasher␊
     /** Smoking test for type generation */␊

examples/napi/__test__/values.spec.ts

@@ -206,6 +206,11 @@ test('class', (t) => {
   })
 })
 
+test('async self in class', async (t) => {
+  const b = new Bird('foo')
+  t.is(await b.getNameAsync(), 'foo')
+})
+
 test('class factory', (t) => {
   const duck = ClassWithFactory.withName('Default')
   t.is(duck.name, 'Default')

examples/napi/index.d.ts

@@ -237,6 +237,7 @@ export class Bird {
   name: string
   constructor(name: string)
   getCount(): number
+  getNameAsync(): Promise<string>
 }
 export type Blake2bHasher = Blake2BHasher
 /** Smoking test for type generation */

examples/napi/src/class.rs

@@ -123,6 +123,12 @@ impl Bird {
   pub fn get_count(&self) -> u32 {
     1234
   }
+
+  #[napi]
+  pub async fn get_name_async(&self) -> &str {
+    tokio::time::sleep(std::time::Duration::new(1, 0)).await;
+    self.name.as_str()
+  }
 }
 
 /// Smoking test for type generation