import { Accessibility } from '../../types';
/**
 * @description
 * Adds a vertical focus zone navigation with a last message as a default tabbable element, pressing enter key focuses inside a message.
 *
 * @specification
 * Provides arrow key navigation in vertical direction.
 * Focus is set initially on the specified default tabbable element.
 * Focused active element of the component is reset when TAB from the component.
 * Focus can be moved inside a child component with embeded inner FocusZone by pressing a specified key.
 * Does not handle PageDown and PageUp.
 */
export declare const chatBehavior: Accessibility<ChatBehaviorProps>;
export declare type ChatBehaviorProps = never;