import { type LitElement } from 'lit';
/**
 * Decorator that adds a property of type "Set" to a component class
 * which contains all connected instances of that component.
 *
 * @ssr true
 *
 * @example
 * ```
 * export class Foo extends Component {
 *     //` @queryConnectedInstances() static readonly instances!: Set<Foo>
 * }
 * ```
 */
export declare function queryConnectedInstances(): (elementConstructor: AbstractConstructor<LitElement>, propertyKey: string) => void;
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