From fc82ba4ec30463cb40ece917744ee304dadeabe8 Mon Sep 17 00:00:00 2001
From: Jannik Keye <jannik.keye@gmail.com>
Date: Wed, 4 Jul 2018 12:56:37 +0200
Subject: [PATCH] feat: add Reflect.preventExtensions

---
 src/js.rs                       |  9 ++++++++
 tests/all/js_globals/Reflect.rs | 41 +++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/src/js.rs b/src/js.rs
index a85a879c..34f30169 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -1057,6 +1057,15 @@ extern "C" {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys
     #[wasm_bindgen(static_method_of = Reflect, js_name = ownKeys, catch)]
     pub fn own_keys(target: &Object) -> Result<JsValue, JsValue>;
+
+    /// The static Reflect.preventExtensions() method prevents new 
+    /// properties from ever being added to an object (i.e. prevents 
+    /// future extensions to the object). It is similar to 
+    /// Object.preventExtensions(), but with some differences.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions
+    #[wasm_bindgen(static_method_of = Reflect, js_name = preventExtensions, catch)]
+    pub fn prevent_extensions(target: &Object) -> Result<JsValue, JsValue>;
 }
 
 // Set
diff --git a/tests/all/js_globals/Reflect.rs b/tests/all/js_globals/Reflect.rs
index 1269f402..0ad3945f 100644
--- a/tests/all/js_globals/Reflect.rs
+++ b/tests/all/js_globals/Reflect.rs
@@ -528,4 +528,45 @@ fn own_keys() {
         "#,
         )
         .test()
+}
+
+#[test]
+fn prevent_extensions() {
+    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 prevent_extensions(target: &js::Object) -> JsValue {
+                let result = js::Reflect::prevent_extensions(target);
+                let result = match result {
+                    Ok(val) => val,
+                    Err(_err) => "TypeError".into()
+                };
+                result
+            }
+        "#,
+        )
+        .file(
+            "test.ts",
+            r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                var object1 = {};
+
+                wasm.prevent_extensions(object1);
+
+                assert.equal(Reflect.isExtensible(object1), false);
+            }
+        "#,
+        )
+        .test()
 }
\ No newline at end of file