diff --git a/lockfile/lockfile-tests.ts b/lockfile/lockfile-tests.ts
new file mode 100644
index 000000000..49aa423d9
--- /dev/null
+++ b/lockfile/lockfile-tests.ts
@@ -0,0 +1,31 @@
+/// <reference path="lockfile.d.ts" />
+
+import lockfile = require('lockfile');
+
+var bool: boolean;
+var num: number;
+var path: string;
+
+var opts: lockfile.Options;
+var callback: (err: Error) => {
+
+};
+
+opts = {
+	wait: num,
+	stale: num,
+	retries: num,
+	retryWait: num
+};
+
+lockfile.lock(path, opts, callback);
+lockfile.lock(path, callback);
+lockfile.lockSync(path, opts);
+
+lockfile.unlock(path, callback);;
+lockfile.unlockSync(path);
+
+lockfile.check(path, opts, callback);
+lockfile.check(path, callback);
+
+bool = lockfile.checkSync(path, opts);
diff --git a/lockfile/lockfile.d.ts b/lockfile/lockfile.d.ts
new file mode 100644
index 000000000..99dfbe28d
--- /dev/null
+++ b/lockfile/lockfile.d.ts
@@ -0,0 +1,24 @@
+// Type definitions for lockfile v0.4.2
+// Project: https://github.com/isaacs/lockfile
+// Definitions by: Bart van der Schoor <https://github.com/Bartvds>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'lockfile' {
+	export interface Options {
+		wait?: number;
+		stale?: number;
+		retries?: number;
+		retryWait?: number;
+	}
+
+	export function lock(path: string, opts: Options, callback: (err: Error) => void): void;
+	export function lock(path: string, callback: (err: Error) => void): void;
+	export function lockSync(path: string, opts: Options):void;
+
+	export function unlock(path: string, callback: (err: Error) => void): void;
+	export function unlockSync(path: string):void;
+
+	export function check(path: string, opts: Options, callback: (err: Error) => void): void;
+	export function check(path: string, callback: (err: Error) => void): void;
+	export function checkSync(path: string, opts: Options): boolean;
+}