/**
 * Hook to handle the back button press event on Android.
 *
 * This hook provides a way to handle the back button press event in a React Native application.
 * It returns an object with methods to add and remove the event listener.
 *
 * @param {() => boolean | null | undefined} handler - The function to call when the back button is pressed.
 * @returns {{ addEventListener: () => void, removeEventListener: () => void }} An object with methods to add and remove the event listener.
 */
export declare function useBackHandler(handler: () => boolean | null | undefined): {
    addEventListener: () => void;
    removeEventListener: () => void;
};