diff --git a/async-lock/async-lock-tests.ts b/async-lock/async-lock-tests.ts
new file mode 100644
index 000000000..d3eedf2fd
--- /dev/null
+++ b/async-lock/async-lock-tests.ts
@@ -0,0 +1,22 @@
+/// <reference path="async-lock.d.ts" />
+
+import * as AsyncLock from "async-lock";
+const lock = new AsyncLock();
+
+lock.acquire("key", (done) => {
+  done();
+}, (err, ret) => { /* ... */ });
+
+lock.acquire("key", (done) => {
+  done();
+}).then(() => { /* ... */ });
+
+lock.acquire([ "key1", "key2" ], (done) => {
+  done();
+}, (err, ret) => { /* ... */ });
+
+lock.isBusy();
+
+const lock2 = new AsyncLock({ timeout : 5000 });
+const lock3 = new AsyncLock({ maxPending : 5000 });
+const lock4 = new AsyncLock({ Promise: null });
diff --git a/async-lock/async-lock.d.ts b/async-lock/async-lock.d.ts
new file mode 100644
index 000000000..e5f8613c7
--- /dev/null
+++ b/async-lock/async-lock.d.ts
@@ -0,0 +1,30 @@
+// Type definitions for async-lock
+// Project: https://github.com/rain1017/async-lock
+// Definitions by: Elisée MAURER <https://github.com/elisee/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare module "async-lock" {
+  interface AsyncLockDoneCallback {
+    (err?: Error, ret?: any): void;
+  }
+
+  interface AsyncLockOptions {
+    timeout?: number;
+    maxPending?: number;
+    domainReentrant?: boolean;
+    Promise?: any;
+  }
+
+  class AsyncLock {
+    constructor(options?: AsyncLockOptions);
+
+    acquire(key: string|string[], fn: (done: AsyncLockDoneCallback) => any, cb: AsyncLockDoneCallback, opts?: AsyncLockOptions): void;
+    acquire(key: string|string[], fn: (done: AsyncLockDoneCallback) => any, opts?: AsyncLockOptions): PromiseLike<any>;
+
+    isBusy(): boolean;
+  }
+
+  namespace AsyncLock {}
+
+  export = AsyncLock;
+}