import type { ReactiveController, ReactiveControllerHost } from 'lit';
/**
 * A controller class which determines whether a focus ring should be shown to indicate keyboard focus.
 * Focus rings are visible only when the user is interacting with a keyboard, not with a mouse, touch, or other input methods.
 *
 * By default the class attaches a keyup event handler on the component host and will update its keyboard focus
 * state based on it.
 */
export declare class KeyboardFocusRingController implements ReactiveController {
    readonly host: ReactiveControllerHost & HTMLElement;
    private readonly _host;
    private _focused;
    /**
     * Gets whether the current focus state is activated through a keyboard interaction.
     */
    get focused(): boolean;
    constructor(host: ReactiveControllerHost & HTMLElement);
    hostConnected(): void;
    hostDisconnected(): void;
    handleEvent(): void;
    /**
     * Resets the keyboard focus state.
     *
     * Usually called on blur of the component or when a pointer based interaction
     * is executed.
     */
    reset: () => void;
}
/**
 * Adds a {@link KeyboardFocusRingController} responsible for managing keyboard focus state.
 */
export declare function addKeyboardFocusRing(host: ReactiveControllerHost & HTMLElement): KeyboardFocusRingController;