export declare class PerformanceRAF {
    nextAnimationFrameCbs: Map<number, FrameRequestCallback>;
    private _rafHandle;
    addAnimationFrameCb(callback: FrameRequestCallback): number;
    removeAnimationFrameCb(index: number): boolean;
    protected runAnimationFrame: (time: number) => void;
    protected tryRunAnimationFrameNextFrame: () => void;
}