diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..584d787
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,24 @@
+type Callback<T> = <E extends Error>(err: E, value: T) => never;
+
+interface DeAsync {
+    <R>(fn: (callback: Callback<R>) => void): () => R;
+    <T1, R>(fn: (arg1: T1, callback: Callback<R>) => void): (arg1: T1) => R;
+    <T1, T2, R>(fn: (arg1: T1, arg2: T2, callback: Callback<R>) => void): (arg1: T1, arg2: T2) => R;
+    <T1, T2, T3, R>(fn: (arg1: T1, arg2: T2, arg3: T3, callback: Callback<R>) => void): (arg1: T1, arg2: T2, arg3: T3) => R;
+    <T1, T2, T3, T4, R>(fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, callback: Callback<R>) => void): (arg1: T1, arg2: T2, arg3: T3, arg4: T4) => R;
+    <T1, T2, T3, T4, T5, R>(fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, callback: Callback<R>) => void): (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5) => R;
+    <T1, T2, T3, T4, T5, T6, R>(fn: (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, arg6: T6, callback: Callback<R>) => void): (arg1: T1, arg2: T2, arg3: T3, arg4: T4, arg5: T5, arg6: T6) => R;
+    (fn: Function): Function
+
+    sleep(timeout: number): void;
+
+    runLoopOnce(): void;
+
+    loopWhile(pred: () => boolean): void;
+
+    await<T>(promise: Promise<T>): T;
+}
+
+declare const instance: DeAsync;
+
+export = instance;
diff --git a/index.js b/index.js
index 28acb68..e4c084c 100644
--- a/index.js
+++ b/index.js
@@ -73,4 +73,19 @@
 	  }
 	};
 
+	module.exports.await = function (promise) {
+		if (promise === null) { return; }
+		if (typeof promise.then !== "function") { return; }
+		var resolved = false, rejected = false,
+			result, error;
+		promise.then(
+			function (value) { resolved = true; result = value; return result; },
+			function (reason) { rejected = true; error = reason; return reason; }
+		)
+		module.exports.loopWhile(function () { return !resolved && !rejected; })
+		if (rejected) {
+			throw error;
+		}
+		return result;
+	}
 }());
diff --git a/package.json b/package.json
index 93326db..6543df4 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "0.1.13",
   "description": "Turns async function into sync via JavaScript wrapper of Node event loop",
   "main": "index.js",
+  "types": "index.d.ts",
   "author": "Vladimir Kurchatkin <vladimir.kurchatkin@gmail.com>",
   "contributors": [
     "Fred Wen <wenfred@gmail.com> (https://github.com/abbr)"