feat(neon): Add TryFromJs implementation for Root

crates/neon/src/types_impl/extract/private.rs

@@ -1,6 +1,7 @@
 use crate::{
     context::FunctionContext,
-    handle::Handle,
+    handle::{Handle, Root},
+    object::Object,
     result::{NeonResult, Throw},
     types::{
         buffer::Binary,
@@ -35,6 +36,8 @@ impl Sealed for &str {}
 
 impl<'cx, V: Value> Sealed for Handle<'cx, V> {}
 
+impl<O: Object> Sealed for Root<O> {}
+
 impl<T> Sealed for Option<T> {}
 
 impl<T, E> Sealed for Result<T, E> {}

crates/neon/src/types_impl/extract/try_from_js.rs

@@ -7,7 +7,8 @@ use std::{convert::Infallible, ptr};
 
 use crate::{
     context::{internal::ContextInternal, Cx},
-    handle::Handle,
+    handle::{Handle, Root},
+    object::Object,
     result::{NeonResult, ResultExt, Throw},
     sys,
     types::{
@@ -45,6 +46,25 @@ where
     from_js!();
 }
 
+impl<'cx, O> TryFromJs<'cx> for Root<O>
+where
+    O: Object,
+{
+    type Error = TypeExpected<O>;
+
+    fn try_from_js(
+        cx: &mut Cx<'cx>,
+        v: Handle<'cx, JsValue>,
+    ) -> NeonResult<Result<Self, Self::Error>> {
+        Ok(match v.downcast::<O, _>(cx) {
+            Ok(v) => Ok(v.root(cx)),
+            Err(_) => Err(TypeExpected::new()),
+        })
+    }
+
+    from_js!();
+}
+
 impl<'cx, T> TryFromJs<'cx> for Option<T>
 where
     T: TryFromJs<'cx>,