[oden-js] Convert Option<>

oden-js/src/conversion/from.rs

@@ -104,3 +104,14 @@ impl TryFromValue for Value {
         Ok(value.dup(ctx))
     }
 }
+
+impl<T: TryFromValue> TryFromValue for Option<T> {
+    #[inline]
+    fn try_from_value(value: &ValueRef, ctx: &ContextRef) -> Result<Self> {
+        if value.is_undefined() {
+            Ok(None)
+        } else {
+            Ok(Some(T::try_from_value(value, ctx)?))
+        }
+    }
+}

oden-js/src/conversion/into.rs

@@ -128,3 +128,13 @@ impl<T: Class> TryIntoValue for T {
         self.into_value(ctx)
     }
 }
+
+impl<T: TryIntoValue> TryIntoValue for Option<T> {
+    #[inline]
+    fn try_into_value(self, ctx: &ContextRef) -> ValueResult {
+        match self {
+            None => Ok(ctx.undefined()),
+            Some(v) => v.try_into_value(ctx),
+        }
+    }
+}