export declare const isString: (arg: any) => arg is string;
export declare const isUndefined: (value: any) => value is undefined;
export declare const isFunction: (value: any) => value is Function;
export declare function isWindow(obj: any): boolean;
export declare function getScroll(target: HTMLElement | Window | Document | null, top: Boolean): number;
export declare function easeInOutCubic(t: number, b: number, c: number, d: number): number;