export declare const on: (element: any, event: any, handler: any) => void;
export declare const off: (element: any, event: any, handler: any) => void;
export declare function hasClass(el: Element | HTMLElement, cls: string): boolean;
export declare function addClass(el: Element | HTMLElement, cls: string): void;
export declare function removeClass(el: Element | HTMLElement, cls: string): void;
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