/**
 * Resolve a target to an HTMLElement.
 * Accepts a CSS selector string or an HTMLElement directly.
 */
export declare function getElement(target: string | HTMLElement): HTMLElement | null;
/**
 * Get the bounding rect of an element as a plain object.
 */
export declare function getRect(el: HTMLElement): DOMRect;
/**
 * Simple className joiner — filters falsy values.
 */
export declare function clsx(...classes: (string | false | null | undefined)[]): string;