/**
 * Get the current brush state.
 *
 * - `start` is the starting point of the brush selection.
 * - `current` is the current point of the brush selection.
 *
 * @returns `{ start, current }` - The brush state.
 */
export declare function useBrush(): {
  start: {
    x: number;
    y: number;
  };
  current: {
    x: number;
    y: number;
  };
} | null;