Type for delta time in IFrame

src/Animation.ts

@@ -2,7 +2,7 @@ import { glob } from './Global';
 import { Layer } from './Layer';
 import { IFrame, AnimationFn } from './types';
 
-var now = (function() {
+var now = (function(): () => number {
   if (glob.performance && glob.performance.now) {
     return function() {
       return glob.performance.now();

src/types.ts

@@ -21,7 +21,7 @@ export interface IRect {
 export interface IFrame {
 	time: number;
 	timeDiff: number;
-	lastTime: any;
+	lastTime: number;
 	frameRate: number;
 }