/**
 * DOM utility functions
 */
/**
 * Safely get element by ID
 */
export declare const getElementById: (id: string) => HTMLElement | null;
/**
 * Add class to element if it doesn't exist
 */
export declare const addClass: (element: HTMLElement, className: string) => void;
/**
 * Remove class from element if it exists
 */
export declare const removeClass: (element: HTMLElement, className: string) => void;
/**
 * Toggle class on element
 */
export declare const toggleClass: (element: HTMLElement, className: string) => void;
/**
 * Check if element is visible in viewport
 */
export declare const isElementInViewport: (element: HTMLElement) => boolean;
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