/**
 * Toggle a boolean state.
 * @param initialValue - Initial value (default false)
 * @returns [value, toggleFunction]
 *
 * Example:
 * const [isOpen, toggle] = useToggle();
 * <button onClick={toggle}>{isOpen ? "Close" : "Open"}</button>
 */
export declare function useToggle(initialValue?: boolean): [boolean, () => void];