fix(napi): handle the referenced object is finalized before Reference::drop

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

@@ -279,6 +279,11 @@ Generated by [AVA](https://avajs.dev).
     export class CssStyleSheet {␊
       constructor(rules: Array<string>)␊
       get rules(): CssRuleList␊
+      anotherCssStyleSheet(): AnotherCssStyleSheet␊
+    }␊
+    export type AnotherCSSStyleSheet = AnotherCssStyleSheet␊
+    export class AnotherCssStyleSheet {␊
+      get rules(): CssRuleList␊
     }␊
     export namespace xxh3 {␊
       export const ALIGNMENT: number␊

examples/napi/__test__/values.spec.ts

@@ -205,6 +205,8 @@ test('should be able to into_reference', (t) => {
   const sheet = new CssStyleSheet(rules)
   t.is(sheet.rules, sheet.rules)
   t.deepEqual(sheet.rules.getRules(), rules)
+  const anotherStyleSheet = sheet.anotherCssStyleSheet()
+  t.is(anotherStyleSheet.rules, sheet.rules)
 })
 
 test('callback', (t) => {

examples/napi/index.d.ts

@@ -269,6 +269,11 @@ export type CSSStyleSheet = CssStyleSheet
 export class CssStyleSheet {
   constructor(rules: Array<string>)
   get rules(): CssRuleList
+  anotherCssStyleSheet(): AnotherCssStyleSheet
+}
+export type AnotherCSSStyleSheet = AnotherCssStyleSheet
+export class AnotherCssStyleSheet {
+  get rules(): CssRuleList
 }
 export namespace xxh3 {
   export const ALIGNMENT: number

examples/napi/src/reference.rs

@@ -76,26 +76,54 @@ impl CSSRuleList {
 
 #[napi]
 pub struct CSSStyleSheet {
+  inner: Rc<RefCell<OwnedStyleSheet>>,
+  rules: Option<Reference<CSSRuleList>>,
+}
+
+#[napi]
+pub struct AnotherCSSStyleSheet {
   inner: Rc<RefCell<OwnedStyleSheet>>,
   rules: Reference<CSSRuleList>,
 }
 
 #[napi]
-impl CSSStyleSheet {
-  #[napi(constructor)]
-  pub fn new(env: Env, rules: Vec<String>) -> Result<Self> {
-    let inner = Rc::new(RefCell::new(OwnedStyleSheet { rules }));
-    let rules = CSSRuleList::into_reference(
-      CSSRuleList {
-        owned: inner.clone(),
-      },
-      env,
-    )?;
-    Ok(CSSStyleSheet { inner, rules })
-  }
-
+impl AnotherCSSStyleSheet {
   #[napi(getter)]
   pub fn rules(&self, env: Env) -> Result<Reference<CSSRuleList>> {
     self.rules.clone(env)
   }
 }
+
+#[napi]
+impl CSSStyleSheet {
+  #[napi(constructor)]
+  pub fn new(rules: Vec<String>) -> Result<Self> {
+    let inner = Rc::new(RefCell::new(OwnedStyleSheet { rules }));
+    Ok(CSSStyleSheet { inner, rules: None })
+  }
+
+  #[napi(getter)]
+  pub fn rules(&mut self, env: Env) -> Result<Reference<CSSRuleList>> {
+    if let Some(rules) = &self.rules {
+      return rules.clone(env);
+    }
+
+    let rules = CSSRuleList::into_reference(
+      CSSRuleList {
+        owned: self.inner.clone(),
+      },
+      env,
+    )?;
+
+    self.rules = Some(rules.clone(env)?);
+    Ok(rules)
+  }
+
+  #[napi]
+  pub fn another_css_style_sheet(&self, env: Env) -> Result<AnotherCSSStyleSheet> {
+    Ok(AnotherCSSStyleSheet {
+      inner: self.inner.clone(),
+      rules: self.rules.as_ref().unwrap().clone(env)?,
+    })
+  }
+}