From 27ee57175ae8f41ba54c441a5d8409b4bfd12e37 Mon Sep 17 00:00:00 2001
From: Jannik Keye <jannik.keye@gmail.com>
Date: Thu, 28 Jun 2018 21:55:10 +0200
Subject: [PATCH] feat(Map): add Map.new

---
 src/js.rs                   |  7 +++++++
 tests/all/js_globals/Map.rs | 28 ++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/src/js.rs b/src/js.rs
index 171c9632..1e5d5f97 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -331,6 +331,13 @@ extern {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/has
     #[wasm_bindgen(method)]
     pub fn has(this: &Map, key: &JsValue) -> bool;
+
+    /// The Map object holds key-value pairs. Any value (both objects and 
+    /// primitive values) maybe used as either a key or a value.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> Map;
 }
 
 // Math
diff --git a/tests/all/js_globals/Map.rs b/tests/all/js_globals/Map.rs
index 5c31c4c2..2bbdddd9 100644
--- a/tests/all/js_globals/Map.rs
+++ b/tests/all/js_globals/Map.rs
@@ -124,4 +124,32 @@ fn has() {
             }
         "#)
         .test()
+}
+
+#[test]
+fn new() {
+    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 new_map() -> js::Map {
+                js::Map::new()
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                const map = wasm.new_map();
+
+                assert.equal(map.size, 0);
+            }
+        "#)
+        .test()
 }
\ No newline at end of file