implements Object.prototype.toLocaleString() binding

src/js.rs

@@ -105,6 +105,14 @@ extern {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable
     #[wasm_bindgen(method, js_name = propertyIsEnumerable)]
     pub fn property_is_enumerable(this: &Object, property: &JsValue) -> bool;
+
+    /// The toLocaleString() method returns a string representing the object.
+    /// This method is meant to be overridden by derived objects for locale-specific
+    /// purposes.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString
+    #[wasm_bindgen(method, js_name = toLocaleString)]
+    pub fn to_locale_string(this: &Object) -> String;
 }
 
 // Array

tests/all/js_globals/Object.rs

@@ -157,3 +157,30 @@ fn property_is_enumerable() {
         "#)
         .test()
 }
+
+#[test]
+fn to_locale_string() {
+    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 to_locale_string() -> String {
+                let object = js::Object::new();
+                object.to_locale_string()
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(wasm.to_locale_string(), "[object Object]");
+            }
+        "#)
+        .test()
+}