From adad606ee3bba6a448361f6ae1196ffea623a13c Mon Sep 17 00:00:00 2001
From: Nick Fitzgerald <fitzgen@gmail.com>
Date: Fri, 10 Aug 2018 11:49:22 -0700
Subject: [PATCH] js-sys: Add bindings for `Object.create`

---
 crates/js-sys/src/lib.rs           |  7 +++++++
 crates/js-sys/tests/wasm/Object.rs | 22 ++++++++++++++++------
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/crates/js-sys/src/lib.rs b/crates/js-sys/src/lib.rs
index dfb45d66..c3091332 100644
--- a/crates/js-sys/src/lib.rs
+++ b/crates/js-sys/src/lib.rs
@@ -1914,6 +1914,13 @@ extern "C" {
     #[wasm_bindgen(static_method_of = Object, js_name = assign)]
     pub fn assign3(target: &Object, source1: &Object, source2: &Object, source3: &Object) -> Object;
 
+    /// The Object.create() method creates a new object, using an existing
+    /// object to provide the newly created object's prototype.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create
+    #[wasm_bindgen(static_method_of = Object)]
+    pub fn create(prototype: &Object) -> Object;
+
     /// The `Object.freeze()` method freezes an object: that is, prevents new
     /// properties from being added to it; prevents existing properties from
     /// being removed; and prevents existing properties, or their enumerability,
diff --git a/crates/js-sys/tests/wasm/Object.rs b/crates/js-sys/tests/wasm/Object.rs
index ee448ea8..97cc7b6a 100644
--- a/crates/js-sys/tests/wasm/Object.rs
+++ b/crates/js-sys/tests/wasm/Object.rs
@@ -1,17 +1,18 @@
-use wasm_bindgen::prelude::*;
-use wasm_bindgen_test::*;
-use std::f64::NAN;
 use js_sys::*;
+use std::f64::NAN;
+use wasm_bindgen::prelude::*;
+use wasm_bindgen::JsCast;
+use wasm_bindgen_test::*;
 
 #[wasm_bindgen]
-extern {
+extern "C" {
     type Foo42;
     #[wasm_bindgen(method, setter, structural)]
     fn set_foo(this: &Foo42, val: JsValue);
 }
 
 #[wasm_bindgen(module = "tests/wasm/Object.js")]
-extern {
+extern "C" {
     fn map_with_symbol_key() -> Object;
     fn symbol_key() -> JsValue;
 
@@ -36,7 +37,6 @@ fn new() {
     assert!(JsValue::from(Object::new()).is_object());
 }
 
-
 #[wasm_bindgen_test]
 fn assign() {
     let a = JsValue::from("a");
@@ -63,6 +63,16 @@ fn assign() {
     assert_eq!(Reflect::get(target.as_ref(), &c), c);
 }
 
+#[wasm_bindgen_test]
+fn create() {
+    let array_proto = eval("Array.prototype")
+        .unwrap()
+        .dyn_into::<Object>()
+        .unwrap();
+    let my_array = Object::create(&array_proto);
+    assert!(my_array.is_instance_of::<Array>());
+}
+
 #[wasm_bindgen_test]
 fn has_own_property() {
     assert!(foo_42().has_own_property(&"foo".into()));