/**
 * Provides APIs to interact with the app button part of the SDK.
 * @module
 */
import { handlerFunctionType } from './pages';
/**
 * Registers a handler for clicking the app button.
 * Only one handler can be registered at a time. A subsequent registration replaces an existing registration.
 * @param handler - The handler to invoke when the personal app button is clicked in the app bar.
 */
export declare function onClick(handler: handlerFunctionType): void;
/**
 * Registers a handler for entering hover of the app button.
 * Only one handler can be registered at a time. A subsequent registration replaces an existing registration.
 * @param handler - The handler to invoke when entering hover of the personal app button in the app bar.
 */
export declare function onHoverEnter(handler: handlerFunctionType): void;
/**
 * Registers a handler for exiting hover of the app button.
 * Only one handler can be registered at a time. A subsequent registration replaces an existing registration.
 * @param handler - The handler to invoke when exiting hover of the personal app button in the app bar.
 */
export declare function onHoverLeave(handler: handlerFunctionType): void;
/**
 * Checks if pages.appButton capability is supported by the host
 * @returns boolean to represent whether the pages.appButton capability is supported
 *
 * @throws Error if {@linkcode app.initialize} has not successfully completed
 */
export declare function isSupported(): boolean;