import { ReactiveController, ReactiveElement } from 'lit';
export type AriaExpanded = ReactiveElement & {
    expanded: boolean;
    readonly?: boolean;
    _internals?: ElementInternals;
};
export declare function stateExpanded<T extends AriaExpanded>(): ClassDecorator;
/**
 * Responsible for managing the aria-expanded attribute and the --expanded CSS state of a LitElement
 */
export declare class StateExpandedController<T extends AriaExpanded> implements ReactiveController {
    private host;
    constructor(host: T);
    hostConnected(): void;
    hostUpdated(): void;
}