Merge pull request #358 from belfz/expose-bindings/object-set-prototype-of

implements Object.setPrototypeOf() binding

src/js.rs

@@ -782,6 +782,13 @@ extern "C" {
     #[wasm_bindgen(static_method_of = Object)]
     pub fn seal(value: &JsValue) -> JsValue;
 
+    /// The Object.setPrototypeOf() method sets the prototype (i.e., the internal
+    /// [[Prototype]] property) of a specified object to another object or null.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
+    #[wasm_bindgen(static_method_of = Object, js_name = setPrototypeOf)]
+    pub fn set_prototype_of(object: &Object, prototype: &Object) -> Object;
+
     /// The toLocaleString() method returns a string representing the object.
     /// This method is meant to be overridden by derived objects for
     /// locale-specific purposes.

tests/all/js_globals/Object.rs

@@ -272,6 +272,36 @@ fn seal() {
         .test()
 }
 
+#[test]
+fn set_prototype_of() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn set_prototype_of(object: &js::Object, prototype: &js::Object) -> js::Object {
+                js::Object::set_prototype_of(&object, &prototype)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                const object = { foo: 42 };
+                const newPrototype = { bar: 'baz' };
+
+                const modifiedObject = wasm.set_prototype_of(object, newPrototype);
+                assert(newPrototype.isPrototypeOf(modifiedObject));
+            }
+        "#)
+        .test()
+}
+
 #[test]
 fn to_locale_string() {
     project()