diff --git a/bezier-easing/bezier-easing-tests.ts b/bezier-easing/bezier-easing-tests.ts
new file mode 100644
index 000000000..eab1fb4f1
--- /dev/null
+++ b/bezier-easing/bezier-easing-tests.ts
@@ -0,0 +1,21 @@
+/// <reference path="bezier-easing.d.ts" />
+
+function test_create_from_array() {
+    let easing: BezierEasing = BezierEasing([0, 0, 1, 0.5]);
+}
+
+function test_create_from_params() {
+    let easing: BezierEasing = BezierEasing(0, 0, 1, 0.5);
+}
+
+function test_create_from_builtins() {
+    let easing: BezierEasing = BezierEasing.css['ease-in'];
+}
+
+function test_methods() {
+    let easing: BezierEasing = BezierEasing.css['ease-in'];
+    let easedRatio: number = easing.get(0.5);
+    let points: Array<number> = easing.getPoints();
+    let stringified: string = easing.toString();
+    let asCSS: string = easing.toCSS();
+}
diff --git a/bezier-easing/bezier-easing.d.ts b/bezier-easing/bezier-easing.d.ts
new file mode 100644
index 000000000..695368e7a
--- /dev/null
+++ b/bezier-easing/bezier-easing.d.ts
@@ -0,0 +1,24 @@
+// Type definitions for bezier-easing
+// Project: https://github.com/gre/bezier-easing
+// Definitions by: brian ridley <https://github.com/ptlis/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare interface BezierEasing {
+    get(ratio: number): number;
+    getPoints(): Array<number>;
+    toString(): string;
+    toCSS(): string;
+}
+
+declare function BezierEasing(points: Array<number>): BezierEasing;
+declare function BezierEasing(a: number, b: number, c: number, d: number): BezierEasing;
+
+declare namespace BezierEasing {
+    let css: {
+        'ease': BezierEasing,
+        'linear': BezierEasing,
+        'ease-in': BezierEasing,
+        'ease-out': BezierEasing,
+        'ease-in-out': BezierEasing
+    };
+}