diff --git a/webcomponents.js/webcomponents.js-tests.ts b/webcomponents.js/webcomponents.js-tests.ts
new file mode 100644
index 0000000000..316f9dd8e5
--- /dev/null
+++ b/webcomponents.js/webcomponents.js-tests.ts
@@ -0,0 +1,39 @@
+/// <reference path="webcomponents.js.d.ts" />
+
+/*
+ * Custom Elements
+ */
+var fooProto = Object.create(HTMLElement.prototype, {
+    createdCallback() {
+        // `this` should be the created element
+        this.getElementsByTagName("a");
+    }
+});
+
+document.registerElement("x-foo", {
+    prototype: fooProto
+});
+
+window.CustomElements.hasNative;
+window.CustomElements.flags;
+window.CustomElements.ready;
+window.CustomElements.useNative;
+
+/*
+ * HTMLImports
+ */
+
+window.HTMLImports.isIE;
+window.HTMLImports.rootDocument.querySelectorAll("div");
+window.HTMLImports.useNative;
+window.HTMLImports.whenReady(() => {
+    return window.HTMLImports.ready === true;
+});
+
+document.querySelectorAll(`link[type=${window.HTMLImports.IMPORT_LINK_TYPE}`);
+
+/*
+ * Web Components
+ */
+window.WebComponents.flags;
+
diff --git a/webcomponents.js/webcomponents.js.d.ts b/webcomponents.js/webcomponents.js.d.ts
new file mode 100644
index 0000000000..43e85373fc
--- /dev/null
+++ b/webcomponents.js/webcomponents.js.d.ts
@@ -0,0 +1,48 @@
+// Type definitions for webcomponents.js 0.6.0
+// Project: https://github.com/webcomponents/webcomponentsjs
+// Definitions by: Adi Dahiya <https://github.com/adidahiya>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module webcomponents {
+
+    export interface CustomElementInit {
+        prototype: HTMLElement;
+        extends?: string;
+    }
+
+    export interface CustomElementsPolyfill {
+        hasNative: boolean;
+        flags: any;
+        ready: boolean;
+        useNative: boolean;
+    }
+
+    export interface HTMLImportsPolyfill {
+        IMPORT_LINK_TYPE: string;
+        isIE: boolean;
+        flags: any;
+        ready: boolean;
+        rootDocument: Document;
+        useNative: boolean;
+        whenReady(callback: () => void): void;
+    }
+
+    export interface Polyfill {
+        flags: any;
+    }
+
+}
+
+declare module "webcomponents.js" {
+    export = webcomponents;
+}
+
+interface Document {
+    registerElement(name: string, prototype: webcomponents.CustomElementInit): void;
+}
+
+interface Window {
+    CustomElements: webcomponents.CustomElementsPolyfill;
+    HTMLImports: webcomponents.HTMLImportsPolyfill;
+    WebComponents: webcomponents.Polyfill;
+}