diff --git a/helmet/helmet-tests.ts b/helmet/helmet-tests.ts
new file mode 100644
index 000000000..04cfcaf36
--- /dev/null
+++ b/helmet/helmet-tests.ts
@@ -0,0 +1,59 @@
+/// <reference path="helmet.d.ts" />
+
+import helmet = require("helmet");
+
+/**
+ * @summary Test for {@see helmet}.
+ */
+function helmetTest() {
+    helmet();
+}
+
+/**
+ * @summary Test for {@see helmet#xssFilter} function.
+ */
+function contentSecurityPolicyTest() {
+    helmet.xssFilter();
+    helmet.xssFilter({ setOnOldIE: true });
+}
+
+/**
+ * @summary Test for {@see helmet#frameguard} function.
+ */
+function frameguardTest() {
+    helmet.frameguard();
+    helmet.frameguard("sameorigin");
+}
+
+/**
+ * @summary Test for {@see helmet#hsts} function.
+ */
+function hstsTest() {
+    helmet.hsts();
+    helmet.hsts({ maxAge: 7776000000 });
+}
+
+/**
+ * @summary Test for {@see helmet#ieNoOpen} function.
+ */
+function ieNoOpenTest() {
+    helmet.ieNoOpen();
+}
+
+/**
+ * @summary Test for {@see helmet#noSniff} function.
+ */
+function noSniffTest() {
+    helmet.noSniff();
+}
+
+/**
+ * @summary Test for {@see helmet#publicKeyPins} function.
+ */
+function publicKeyPinsTest() {
+    helmet.publicKeyPins({
+        sha256s: ["AbCdEf123=", "ZyXwVu456="],
+        includeSubdomains: true,
+        reportUri: "http://example.com"
+    });
+}
diff --git a/helmet/helmet.d.ts b/helmet/helmet.d.ts
new file mode 100644
index 000000000..fca15b926
--- /dev/null
+++ b/helmet/helmet.d.ts
@@ -0,0 +1,57 @@
+// Type definitions for helmet
+// Project: https://github.com/helmetjs/helmet
+// Definitions by: Cyril Schumacher <https://github.com/cyrilschumacher>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+interface Helmet {
+    (): void;
+
+    /**
+     * @summary Prevent clickjacking.
+     * @param {string} header The header.
+     */
+    frameguard(header ?: string): void;
+
+    /**
+     * @summary Hide "X-Powered-By" header.
+     * @param {Object} options The options.
+     */
+    hidePoweredBy(options ?: Object): void;
+
+    /**
+     * @summary Adds the "Strict-Transport-Security" header.
+     * @param {Object} options The options.
+     */
+    hsts(options ?: Object): void;
+
+    /**
+     * @summary Add the "X-Download-Options" header.
+     */
+    ieNoOpen(): void;
+
+    /**
+     * @summary Add the "Cache-Control" and "Pragma" headers to stop caching.
+     */
+    nocache(options ?: Object): void;
+
+    /**
+     * @summary Adds the "X-Content-Type-Options" header.
+     */
+    noSniff(): void;
+
+    /**
+     * @summary Adds the "Public-Key-Pins" header.
+     */
+    publicKeyPins(options ?: Object): void;
+
+    /**
+     * @summary Prevent Cross-site scripting attacks.
+     * @param {Object} options The options.
+     */
+    xssFilter(options ?: Object): void;
+}
+
+declare module "helmet" {
+    var helmet: Helmet;
+    export = helmet;
+}