import { type ReactiveElement } from 'lit';
/**
 * `:focus-visible` polyfill which adds the `focus-visible` class to the given `host` element
 * when a focus event occurs following a keyboard event.
 */
export declare class FocusVisibleController {
    protected readonly _host: ReactiveElement;
    constructor(_host: ReactiveElement);
}
export declare function focusVisiblePolyfill(host: ReactiveElement): FocusVisibleController;
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