/**
 * Return an array of 3 element, representing:
 *  - current boolean value
 *  - a function to set the value to true
 *  - a function to set the value to false
 *
 * Example usage:
 * const [showModal, openModal, closeModal] = useBool();
 */
export declare function useBool(initialValue?: boolean): [boolean, () => void, () => void];