/**
 * Map viewport client coordinates to coordinates relative to `el`'s border box.
 * Returns null when the point is outside the box (per exclusive upper bound on width/height used elsewhere in cursor components).
 */
export type LocalPoint = {
    x: number;
    y: number;
};
export declare function clientPointInElement(clientX: number, clientY: number, el: Element): LocalPoint | null;