diff --git a/coffeeify/coffeeify-tests.ts b/coffeeify/coffeeify-tests.ts
new file mode 100644
index 0000000000..753f68e79c
--- /dev/null
+++ b/coffeeify/coffeeify-tests.ts
@@ -0,0 +1,15 @@
+/// <reference path="coffeeify.d.ts" />
+
+import coffeeify = require('coffeeify');
+
+coffeeify.sourceMap = false;
+
+var isCoffee = coffeeify.isCoffee('foo.coffee');
+var isLiterate = coffeeify.isLiterate('bar.coffee');
+coffeeify.compile('out.js', 'console.log 42', (err, compiled) => {
+    console.log(err);
+    console.log(compiled);
+});
+
+coffeeify('test.coffee').end();
+
diff --git a/coffeeify/coffeeify.d.ts b/coffeeify/coffeeify.d.ts
new file mode 100644
index 0000000000..9651cdb15f
--- /dev/null
+++ b/coffeeify/coffeeify.d.ts
@@ -0,0 +1,37 @@
+// Type definitions for coffeeify
+// Project: https://github.com/jnordberg/coffeeify
+// Definitions by: Qubo <https://github.com/tkQubo>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../through/through.d.ts" />
+
+declare module "coffeeify" {
+    import through = require('through');
+
+    namespace coffeeify {
+        interface Coffeeify {
+            isCoffee(file: string): boolean;
+            isLiterate(file: string): boolean;
+            sourceMap: boolean;
+            compile(file: string, data: string, callback: Callback): void;
+            (file: string): through.ThroughStream;
+        }
+
+        interface Callback {
+            (error: ParseError, compiled: string): void;
+        }
+
+        interface ParseError extends SyntaxError {
+            new(error: any, src: string, file: string): ParseError;
+            message: string;
+            line: number;
+            column: number;
+            annotated: string;
+        }
+    }
+
+    var coffeeify: coffeeify.Coffeeify;
+
+    export = coffeeify;
+}
+
diff --git a/through/through.d.ts b/through/through.d.ts
index 1491085a2f..6e13e4d623 100644
--- a/through/through.d.ts
+++ b/through/through.d.ts
@@ -8,7 +8,7 @@
 declare module "through" {
 	import stream = require("stream");
 
-	function through(write?: (data) => void,
+	function through(write?: (data: any) => void,
 		end?: () => void,
 		opts?: {
 			autoDestroy: boolean;
@@ -21,4 +21,4 @@ declare module "through" {
 	}
 
 	export = through;
-}
\ No newline at end of file
+}