From b005e96fd9bd46ba67ab91b8ba3d750eeff72978 Mon Sep 17 00:00:00 2001
From: Michael Hoffmann <brennan.brisad@gmail.com>
Date: Sun, 16 Sep 2018 22:55:15 +0200
Subject: [PATCH] Add binding for Object.getOwnPropertyDescriptor()

---
 crates/js-sys/src/lib.rs           |  9 +++++++++
 crates/js-sys/tests/wasm/Object.rs | 13 +++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/crates/js-sys/src/lib.rs b/crates/js-sys/src/lib.rs
index 512d0d9e..f074dd20 100644
--- a/crates/js-sys/src/lib.rs
+++ b/crates/js-sys/src/lib.rs
@@ -2022,6 +2022,15 @@ extern "C" {
     #[wasm_bindgen(static_method_of = Object)]
     pub fn freeze(value: &Object) -> Object;
 
+    /// The Object.getOwnPropertyDescriptor() method returns a
+    /// property descriptor for an own property (that is, one directly
+    /// present on an object and not in the object's prototype chain)
+    /// of a given object.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor)
+    #[wasm_bindgen(static_method_of = Object, js_name = getOwnPropertyDescriptor)]
+    pub fn get_own_property_descriptor(obj: &Object, prop: &JsValue) -> JsValue;
+
     /// The `hasOwnProperty()` method returns a boolean indicating whether the
     /// object has the specified property as its own property (as opposed to
     /// inheriting it).
diff --git a/crates/js-sys/tests/wasm/Object.rs b/crates/js-sys/tests/wasm/Object.rs
index 832985c3..de4dfffe 100644
--- a/crates/js-sys/tests/wasm/Object.rs
+++ b/crates/js-sys/tests/wasm/Object.rs
@@ -13,6 +13,10 @@ extern "C" {
     type DefinePropertyAttrs;
     #[wasm_bindgen(method, setter, structural)]
     fn set_value(this: &DefinePropertyAttrs, val: &JsValue);
+
+    type PropertyDescriptor;
+    #[wasm_bindgen(method, getter, structural)]
+    fn value(this: &PropertyDescriptor) -> JsValue;
 }
 
 #[wasm_bindgen(module = "tests/wasm/Object.js")]
@@ -101,6 +105,15 @@ fn define_properties() {
     assert!(foo.has_own_property(&"car".into()));
 }
 
+#[wasm_bindgen_test]
+fn get_own_property_descriptor() {
+    let foo = foo_42();
+    let desc = Object::get_own_property_descriptor(&foo, &"foo".into());
+    assert_eq!(PropertyDescriptor::from(desc).value(), 42);
+    let desc = Object::get_own_property_descriptor(&foo, &"bar".into());
+    assert!(PropertyDescriptor::from(desc).value().is_undefined());
+}
+
 #[wasm_bindgen_test]
 fn has_own_property() {
     assert!(foo_42().has_own_property(&"foo".into()));