export declare function hasClass(el: HTMLElement, cls: string): boolean;
export declare function addClass(el: HTMLElement, cls: string): void;
export declare function removeClass(el: HTMLElement, cls: string): void;
export declare const getStyle: (element: HTMLElement, styleName: string) => string;
export declare function getScrollBarWidth(): number;
export declare function isHtmlElement(el: any): boolean;
export declare function isScroll(el: HTMLElement, isVertical?: boolean): RegExpMatchArray;
export declare function getScrollContainer(el: HTMLElement, isVertical?: boolean): (Window & typeof globalThis) | HTMLElement;
export declare function isInContainer(el: HTMLElement, container: HTMLElement): boolean;
