Js binding for to_string

src/js.rs

@@ -85,4 +85,12 @@ extern {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
     #[wasm_bindgen(method, js_name = hasOwnProperty)]
     pub fn has_own_property(this: &Object, property: &str) -> bool;
+
+    /// The toString() method returns a string representing the object.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString
+    #[wasm_bindgen(method, js_name = toString)]
+    pub fn to_string(this: &Object) -> String;
+
+
 }

tests/all/js_globals/Object.rs

@@ -54,3 +54,36 @@ fn has_own_property() {
         "#)
         .test()
 }
+
+#[test]
+fn to_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_string(obj: &js::Object) -> String {
+                obj.to_string()
+            }
+
+            #[wasm_bindgen]
+            pub fn test() {
+                let object = js::Object::new();
+                assert_eq!(object.to_string(), "[object Object]");
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(wasm.to_string({ foo: 42 }), "[object Object]");
+                wasm.test();
+            }
+        "#)
+        .test()
+}