import { ControllerBase, type ControllerHost } from './Abstracts/ControllerBase';
/**
 * FocusTrapController class to handle focus trapping for Lit components.
 * Restricts focus within the specified Lit component for accessibility support.
 *
 * @public
 */
export declare class FocusTrapController extends ControllerBase {
    private _focusableElements;
    private _firstFocusableElement;
    private _lastFocusableElement;
    /**
     * Constructs a new instance of the `FocusTrapController` class.
     *
     * @public
     */
    constructor(host: ControllerHost);
    /**
     * @public
     * @override
     */
    hostConnected(): void;
    /**
     * @public
     * @override
     */
    hostDisconnected(): void;
    /**
     * Activates focus trapping within the component.
     *
     * @public
     */
    activate(): void;
    /**
     * Deactivates focus trapping within the component.
     *
     * @public
     */
    deactivate(): void;
    /**
     * Finds and returns all focusable elements within the host.
     *
     * @returns {HTMLElement[]} Array of focusable elements.
     */
    private getFocusableElements;
    /**
     * Handles keydown events to trap focus within the component.
     *
     * @param {KeyboardEvent} event - The keyboard event to handle.
     */
    private readonly handleKeyDown;
}
/**
 * Adds a focus trap controller to the given host.
 *
 * @public
 * @param host The host element.
 * @returns The focus trap controller instance.
 */
export declare function addFocusTrapController(host: ControllerHost): FocusTrapController;
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