feat(Map): add Map.clear

src/js.rs

@@ -302,6 +302,18 @@ extern {
     pub fn to_string(this: &Function) -> JsString;
 }
 
+// Map
+#[wasm_bindgen]
+extern {
+    pub type Map;
+
+    /// The clear() method removes all elements from a Map object.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear
+    #[wasm_bindgen(method)]
+    pub fn clear(this: &Map);
+}
+
 // Math
 #[wasm_bindgen]
 extern {

tests/all/js_globals/Map.rs

@@ -0,0 +1,35 @@
+#![allow(non_snake_case)]
+
+use project;
+
+#[test]
+fn clear() {
+    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 map_clear(this: &js::Map) {
+                this.clear();
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                const map = new Map();
+                map.set('foo', 'bar');
+                map.set('bar', 'baz');
+                assert.equal(map.size, 2);
+                wasm.map_clear(map);
+                assert.equal(map.size, 0);
+
+            }
+        "#)
+        .test()
+}

tests/all/js_globals/mod.rs

@@ -8,6 +8,7 @@ mod Boolean;
 mod Date;
 mod Function;
 mod JsString;
+mod Map;
 mod Math;
 mod WeakMap;
 mod WeakSet;