From 42e02f7769c206f3f1f02ece6feea0e17e34706d Mon Sep 17 00:00:00 2001
From: bokuweb <bokuweb12@gmail.com>
Date: Thu, 9 Aug 2018 08:56:59 +0900
Subject: [PATCH] js-sys: Add extends attributes for js_sys::Number

---
 crates/js-sys/src/lib.rs           | 1 +
 crates/js-sys/tests/wasm/Number.rs | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/crates/js-sys/src/lib.rs b/crates/js-sys/src/lib.rs
index 30ec0855..9452d0a8 100644
--- a/crates/js-sys/src/lib.rs
+++ b/crates/js-sys/src/lib.rs
@@ -1385,6 +1385,7 @@ extern "C" {
 // Number.
 #[wasm_bindgen]
 extern "C" {
+    #[wasm_bindgen(extends = Object)]
     #[derive(Clone, Debug)]
     pub type Number;
 
diff --git a/crates/js-sys/tests/wasm/Number.rs b/crates/js-sys/tests/wasm/Number.rs
index fee72abc..a79a57c6 100644
--- a/crates/js-sys/tests/wasm/Number.rs
+++ b/crates/js-sys/tests/wasm/Number.rs
@@ -1,9 +1,17 @@
 use std::f64::{INFINITY, NAN};
 
+use wasm_bindgen::JsCast;
 use wasm_bindgen::JsValue;
 use wasm_bindgen_test::*;
 use js_sys::*;
 
+#[wasm_bindgen_test]
+fn number_inheritance() {
+    let number = Number::new(&JsValue::from(10));
+    assert!(number.is_instance_of::<Number>());
+    assert!(number.is_instance_of::<Object>());
+}
+
 #[wasm_bindgen_test]
 fn is_finite() {
     assert!(Number::is_finite(&42.into()));