import type { Constructor } from '@apollo-elements/core/types';
import type { OperationVariables } from '@apollo/client';
import { PolymerApolloElement } from './polymer-apollo-element.js';
declare const PolymerApolloSubscription_base: Constructor<PolymerApolloElement<unknown, unknown>> & {
    new <D_1, V_1 extends OperationVariables = OperationVariables>(...a: any[]): PolymerApolloElement<unknown, unknown> & import("@apollo-elements/core").ApolloSubscriptionElement<D_1, V_1>;
    documentType: "subscription";
};
/**
 * @element polymer-apollo-subscription
 *
 * `<polymer-apollo-subscription>` fires Polymer-style prop-changed events
 * when its `data`, `error`, or `loading` properties change.
 *
 * See [ApolloSubscriptionInterface](/api/core/interfaces/subscription/) for more information.
 *
 * @example <caption>Subscribing for Updates</caption>
 * ```html
 *          <polymer-apollo-subscription
 *              data="{{data}}"
 *              variables="[[variables]]"
 *              subscription="[[UserJoinedSubscription]]"
 *              on-data-changed="toast"
 *          ></polymer-apollo-subscription>
 *
 *          <paper-toast duration="5000" text="A wild [[data.userJoined.name]] approaches!">
 *            <iron-image>[[data.userJoined.picture]]</iron-image>
 *          </paper-toast>
 * ```
 *
 * @fires {PolymerChangeEvent<Data<D>>} data-changed
 * @fires {PolymerChangeEvent<Variables<D, V>>} variables-changed
 * @fires {PolymerChangeEvent<Error>} error-changed
 * @fires {PolymerChangeEvent<readonly GraphQLError[]>} errors-changed
 * @fires {PolymerChangeEvent<boolean>} loading-changed
 */
export declare class PolymerApolloSubscription<D = unknown, V extends OperationVariables = OperationVariables> extends PolymerApolloSubscription_base<D, V> {
    static readonly is = "polymer-apollo-subscription";
}
declare global {
    interface HTMLElementTagNameMap {
        'polymer-apollo-subscription': PolymerApolloSubscription<unknown>;
    }
}
export {};