declare type Easing = (timeElapsed: number, start?: number, distance?: number, duration?: number) => number;
declare var singleton: (target: number | HTMLElement | string, options?: {
    duration?: number | Function | undefined;
    offset?: number | undefined;
    callback?: Function | undefined;
    easing?: Easing | undefined;
    a11y?: boolean | undefined;
    target?: string | undefined;
}) => void;
export default singleton;