/**
 * Character for center alignment.
 *
 * @see https://www.fileformat.info/info/unicode/char/200b/index.htm
 */
export declare const ZERO_WIDTH_SPACE: string;
/**
 * Checks if the node is a Document.
 *
 * Suitable for use in same-origin iframes.
 *
 * @param {Node} node - The node to check.
 * @returns {boolean} - True if the node is a Document, otherwise false.
 */
export declare function isDocument(node: Node): node is Document;
/**
 * Checks if the node is a ShadowRoot.
 *
 * Suitable for use in same-origin iframes.
 *
 * @param {Node} node - The node to check.
 * @returns {boolean} - True if the node is a ShadowRoot, otherwise false.
 */
export declare function isShadowRoot(node: Node): node is ShadowRoot;