import { Direction, GoBackHandler } from './SpatialNavigationProvider.types';
/**
 * Track focusable elements in the app and move the focus to the next focusable element.
 */
export declare class SpatialNavigation {
    /** Root element */
    private root;
    /** Currently focused element
     * Use WeakRef to avoid memory leaks
     * */
    private activeElement;
    /**
     * Observer to track the active element changes.
     */
    private activeElementObserver;
    /**
     * Back navigation handler
     * @private
     */
    private readonly goBackHandler;
    constructor(goBackHandler?: GoBackHandler);
    /**
     * Mutation Observer callback
     */
    private activeElementObserverCallback;
    /**
     * Initialize the spatial navigation.
     */
    initActiveElement(): void;
    /**
     * Update the list of the focusable elements in the app.
     */
    private findActiveElement;
    /**
     * Focus the next element in the given direction.
     *
     * @param direction User pressed arrow key.
     */
    focusNext(direction: Direction): void;
    /**
     * Handle back action
     *
     * Either trigger click on goBack element if any
     * otherwise call default go back handler
     */
    goBack(): void;
    /**
     * Set the active element.
     *
     * Also connect star tracking the active element.
     * @param element
     */
    setActiveElement(element: HTMLElement): void;
    /**
     * Set the active element and call .focus() on it
     * @param element
     */
    setActiveElementAndFocus(element: HTMLElement): void;
    /**
     * Get active (focused) element
     */
    getActiveElement(): HTMLElement | undefined;
    /**
     * Cleanup resources
     */
    dispose(): void;
}