From 326e4c02624b5cd1e050c14dabf1670d618787c2 Mon Sep 17 00:00:00 2001
From: Michael Hoffmann <brennan.brisad@gmail.com>
Date: Wed, 19 Sep 2018 21:10:40 +0200
Subject: [PATCH] Add binding for Object.getPrototypeOf()

---
 crates/js-sys/src/lib.rs           |  8 ++++++++
 crates/js-sys/tests/wasm/Object.rs | 13 +++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/crates/js-sys/src/lib.rs b/crates/js-sys/src/lib.rs
index da8591f5..08531aa4 100644
--- a/crates/js-sys/src/lib.rs
+++ b/crates/js-sys/src/lib.rs
@@ -2055,6 +2055,14 @@ extern "C" {
     #[wasm_bindgen(static_method_of = Object, js_name = getOwnPropertySymbols)]
     pub fn get_own_property_symbols(obj: &Object) -> Array;
 
+    /// The Object.getPrototypeOf() method returns the prototype
+    /// (i.e. the value of the internal [[Prototype]] property) of the
+    /// specified object.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf)
+    #[wasm_bindgen(static_method_of = Object, js_name = getPrototypeOf)]
+    pub fn get_prototype_of(obj: &JsValue) -> Object;
+
     /// 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 1304fd0b..ccd37a9a 100644
--- a/crates/js-sys/tests/wasm/Object.rs
+++ b/crates/js-sys/tests/wasm/Object.rs
@@ -10,6 +10,11 @@ extern "C" {
     #[wasm_bindgen(method, setter, structural)]
     fn set_foo(this: &Foo42, val: JsValue);
 
+    #[wasm_bindgen(js_name = prototype, js_namespace = Object)]
+    static OBJECT_PROTOTYPE: JsValue;
+    #[wasm_bindgen(js_name = prototype, js_namespace = Array)]
+    static ARRAY_PROTOTYPE: JsValue;
+
     type DefinePropertyAttrs;
     #[wasm_bindgen(method, setter, structural)]
     fn set_value(this: &DefinePropertyAttrs, val: &JsValue);
@@ -137,6 +142,14 @@ fn get_own_property_symbols() {
     assert_eq!(symbols.length(), 1);
 }
 
+#[wasm_bindgen_test]
+fn get_prototype_of() {
+    let proto = JsValue::from(Object::get_prototype_of(&Object::new().into()));
+    assert_eq!(proto, *OBJECT_PROTOTYPE);
+    let proto = JsValue::from(Object::get_prototype_of(&Array::new().into()));
+    assert_eq!(proto, *ARRAY_PROTOTYPE);
+}
+
 #[wasm_bindgen_test]
 fn has_own_property() {
     assert!(foo_42().has_own_property(&"foo".into()));