/**
 * Determines the side that a moving rectangle hits of another rectangle.
 *
 * @param moving The moving rectangle.
 * @param hitting The rectangle to be hit.
 * @returns The side of `hitted` that `draggable` hits.
 */
export declare function side(moving: {
    x: number;
    y: number;
    width: number;
    height: number;
}, hitting: {
    x: number;
    y: number;
    width: number;
    height: number;
}): "top" | "bottom" | "left" | "right" | null;