import { EventListener } from '@telegram-apps/bridge';
import { State } from './types.js';
/**
 * Signal indicating if the Secondary Button is supported.
 */
export declare const isSupported: import('@telegram-apps/signals').Computed<boolean>;
/**
 * Mounts the Secondary Button restoring its state.
 * @throws {FunctionNotAvailableError} The environment is unknown
 * @throws {FunctionNotAvailableError} The SDK is not initialized
 * @throws {FunctionNotAvailableError} The function is not supported
 * @example
 * if (mount.isAvailable()) {
 *   mount();
 * }
 */
export declare const mount: import('../../wrappers/wrapSafe.js').SafeWrapped<() => void, true, never>;
/**
 * Adds a new Secondary Button click listener.
 * @param fn - event listener.
 * @returns A function to remove bound listener.
 * @throws {FunctionNotAvailableError} The environment is unknown
 * @throws {FunctionNotAvailableError} The SDK is not initialized
 * @throws {FunctionNotAvailableError} The function is not supported
 * @example
 * if (onClick.isAvailable()) {
 *   const off = onClick(() => {
 *     console.log('User clicked the Secondary Button');
 *     off();
 *   });
 * }
 */
export declare const onClick: import('../../wrappers/wrapSafe.js').SafeWrapped<(fn: EventListener<"secondary_button_pressed">) => VoidFunction, true, never>;
/**
 * Removes the Secondary Button click listener.
 * @param fn - an event listener.
 * @throws {FunctionNotAvailableError} The environment is unknown
 * @throws {FunctionNotAvailableError} The SDK is not initialized
 * @throws {FunctionNotAvailableError} The function is not supported
 * @example
 * if (offClick.isAvailable()) {
 *   function listener() {
 *     console.log('User clicked the Secondary Button');
 *     offClick(listener);
 *   }
 *   onClick(listener);
 * }
 */
export declare const offClick: import('../../wrappers/wrapSafe.js').SafeWrapped<(fn: EventListener<"secondary_button_pressed">) => void, true, never>;
/**
 * Updates the Secondary Button state.
 * @param updates - state changes to perform.
 * @throws {FunctionNotAvailableError} The environment is unknown
 * @throws {FunctionNotAvailableError} The SDK is not initialized
 * @throws {FunctionNotAvailableError} The parent component is not mounted
 * @throws {FunctionNotAvailableError} The function is not supported
 * @example
 * if (setParams.isAvailable()) {
 *   setParams({
 *     text: 'Submit',
 *     isEnabled: true,
 *     isVisible: true,
 *     position: 'left',
 *   });
 * }
 */
export declare const setParams: import('../../wrappers/wrapSafe.js').SafeWrapped<(updates: Partial<State>) => void, true, never>;
/**
 * Unmounts the Secondary Button.
 *
 * Note that this function does not remove listeners added via the `onClick`
 * function, so you have to remove them on your own.
 * @see onClick
 */
export declare function unmount(): void;