/**
 * All properties that should be excluded from the deep copy of an HTML element.
 */
export declare const excludedProps: Set<string>;
/**
 * Casts a node to an element, or returns null if the node is not an element.
 * @param {ChildNode | Element | null} node - The node to cast.
 * @returns {Element | null} - The casted element, or null if the node is not an element.
 */
export declare function asElement(node: Element | ChildNode | null): Element | null;
/**
 * Deep copy an HTML element with all its attributes, properties, and child nodes.
 * This method is useful for creating a clone of an element that can be safely modified without affecting the original.
 * @param {HTMLElement} element - The HTML element to copy.
 * @returns {HTMLElement} - A deep copy of the HTML element.
 * @example const copy = deepCopyElement(document.getElementById('myElement'));
 */
export declare function deepCopyElement(element: HTMLElement): HTMLElement;