/**
 * Provides APIs for handling the user's navigational history.
 * @module
 */
import { backButtonHandlerFunctionType } from './pages';
/**
 * @hidden
 * Register backButtonPress handler.
 *
 * @internal
 * Limited to Microsoft-internal use.
 */
export declare function _initialize(): void;
/**
 * Navigates back in the hosted application. See {@link pages.backStack.registerBackButtonHandler} for notes on usage.
 * @returns Promise that resolves when the navigation has completed.
 */
export declare function navigateBack(): Promise<void>;
/**
 * Registers a handler for user presses of the host client's back button. Experiences that maintain an internal
 * navigation stack should use this handler to navigate the user back within their frame. If an application finds
 * that after running its back button handler it cannot handle the event it should call the navigateBack
 * method to ask the host client to handle it instead.
 * @param handler - The handler to invoke when the user presses the host client's back button.
 */
export declare function registerBackButtonHandler(handler: backButtonHandlerFunctionType): void;
/**
 * @hidden
 * Undocumented helper function with shared code between deprecated version and current version of the registerBackButtonHandler API.
 *
 * @internal
 * Limited to Microsoft-internal use
 * @param apiVersionTag - The tag indicating API version number with name
 * @param handler - The handler to invoke when the user presses the host client's back button.
 * @param versionSpecificHelper - The helper function containing logic pertaining to a specific version of the API.
 */
export declare function registerBackButtonHandlerHelper(apiVersionTag: string, handler: () => boolean, versionSpecificHelper?: () => void): void;
/**
 * Checks if the pages.backStack capability is supported by the host
 * @returns boolean to represent whether the pages.backStack capability is supported
 *
 * @throws Error if {@linkcode app.initialize} has not successfully completed
 */
export declare function isSupported(): boolean;