diff --git a/src/js.rs b/src/js.rs
index cef43b162..71bc5a39f 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -434,6 +434,45 @@ extern {
     pub fn value_of(this: &Object) -> Object;
 }
 
+// WeakMap
+#[wasm_bindgen]
+extern {
+    pub type WeakMap;
+
+    /// Returns the function that created an WeakMap wrapper.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> WeakMap;
+
+    /// The set() method sets the value for the key in the WeakMap object. Returns 
+    /// the WeakMap object.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/set
+    #[wasm_bindgen(method, js_class="WeakMap")]
+    pub fn set(this: &WeakMap, key: JsValue, value: JsValue) -> WeakMap;
+
+    /// The get() method returns a specified by key element 
+    /// from a WeakMap object.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/get
+    #[wasm_bindgen(method)]
+    pub fn get(this: &WeakMap, key: JsValue) -> JsValue;
+
+    /// The has() method returns a boolean indicating whether an element with 
+    /// the specified key exists in the WeakMap object or not.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/has
+    #[wasm_bindgen(method)]
+    pub fn has(this: &WeakMap, key: JsValue) -> bool;
+
+    /// The delete() method removes the specified element from a WeakMap object.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/delete
+    #[wasm_bindgen(method)]
+    pub fn delete(this: &WeakMap, key: JsValue) -> bool;
+}
+
 // JsString
 #[wasm_bindgen]
 extern {
diff --git a/tests/all/js_globals/WeakMap.rs b/tests/all/js_globals/WeakMap.rs
new file mode 100644
index 000000000..47206ea8c
--- /dev/null
+++ b/tests/all/js_globals/WeakMap.rs
@@ -0,0 +1,154 @@
+#![allow(non_snake_case)]
+
+use project;
+
+#[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_weak_map() -> js::WeakMap {
+                js::WeakMap::new()
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(typeof wasm.new_weak_map(), "object");
+            }
+        "#)
+        .test()
+}
+
+
+#[test]
+fn get() {
+    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 get_value(this: &js::WeakMap, key: JsValue) -> JsValue {
+                this.get(key)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let map = new WeakMap();
+                let key = {some: "key"};
+                map.set(key, "value");
+                assert.equal(wasm.get_value(map, key), "value");
+
+                let undef = "unexisting_key";
+                assert.equal(typeof wasm.get_value(map, undef), "undefined");
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn set() {
+    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 set_value(this: &js::WeakMap, key: JsValue, value: JsValue) -> js::WeakMap {
+                this.set(key, value)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let map = new WeakMap();
+                let key = {some: "key"};
+                wasm.set_value(map, key, "value");
+                assert.equal(map.get(key), "value");
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn has() {
+    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 has_value(this: &js::WeakMap, key: JsValue) -> bool {
+                this.has(key)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let map = new WeakMap();
+                let key = {some: "key"};
+                map.set(key, "value");
+                assert.equal(wasm.has_value(map, key), true);
+
+                let undef = "unexisting_key";
+                assert.equal(wasm.has_value(map, undef), false);
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn delete() {
+    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 delete_key(this: &js::WeakMap, key: JsValue) -> bool {
+                this.delete(key)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let map = new WeakMap();
+                let key = {some: "key"};
+                map.set(key, "value");
+                assert.equal(wasm.delete_key(map, key), true);
+                assert.equal(map.has(key), false);
+                assert.equal(wasm.delete_key(map, key), false);
+            }
+        "#)
+        .test()
+}
\ No newline at end of file
diff --git a/tests/all/js_globals/mod.rs b/tests/all/js_globals/mod.rs
index 3fd54d808..025f27e41 100644
--- a/tests/all/js_globals/mod.rs
+++ b/tests/all/js_globals/mod.rs
@@ -9,6 +9,7 @@ mod JsFunction;
 mod JsString;
 mod Number;
 mod Math;
+mod WeakMap;
 
 #[test]
 #[cfg(feature = "std")]