import { IElementAnimate, IEffectTiming, IAnimation, IKeyframe } from './types';
declare global  {
    interface Element {
        animate: IElementAnimate;
    }
}
export declare function animate(el: Element, keyframes: IKeyframe[], duration: number): IAnimation;
export declare function animate(el: Element, keyframes: IKeyframe[], timing: IEffectTiming): IAnimation;
export declare function polyfill(): void;
export declare function isPolyfilled(): boolean;