diff --git a/bezier-easing/bezier-easing-tests.ts b/bezier-easing/bezier-easing-tests.ts
index eab1fb4f1..f928fa62d 100644
--- a/bezier-easing/bezier-easing-tests.ts
+++ b/bezier-easing/bezier-easing-tests.ts
@@ -1,21 +1,10 @@
 /// <reference path="bezier-easing.d.ts" />
 
-function test_create_from_array() {
-    let easing: BezierEasing = BezierEasing([0, 0, 1, 0.5]);
+function get_easing() {
+    let easing: Easing = 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();
-}
+function use_easing() {
+    let easing: Easing = BezierEasing(0, 0, 1, 0.5);
+    let eased: number = easing(1);
+}
\ No newline at end of file
diff --git a/bezier-easing/bezier-easing.d.ts b/bezier-easing/bezier-easing.d.ts
index 695368e7a..2a742daf1 100644
--- a/bezier-easing/bezier-easing.d.ts
+++ b/bezier-easing/bezier-easing.d.ts
@@ -3,22 +3,8 @@
 // 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 interface Easing {
+    (x: number): number;
 }
 
-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
-    };
-}
+declare function BezierEasing(mX1: number, mY1: number, mX2: number, mY2: number): Easing;