import Hub from "../hub";
import { MatchSpec } from "../match";
import Message from "../message";
import * as pubsub from "../pubsub";
export interface HeaderStoreOptions {
    persistent?: boolean;
}
/**
 * Selectively remember messages (per topic) based on the presence of certain
 * message headers.
 *
 * Behavior is determined by the `keep` header:
 * { keep: true } -> Store message, replacing previous message with same topic if any
 * { keep: false } -> Remove any stored message for this topic (and pass this one on)
 * { } -> Just pass message on, without impacting any stored message for this topic
 *
 * When a new Destination binds to this, all currently remembered topics are
 * sent to it.
 */
export declare class HeaderStore extends pubsub.BaseSource implements pubsub.Initializable {
    name: string;
    private _state;
    private _storage;
    private _options;
    constructor(name: string, options?: HeaderStoreOptions);
    init(hub: Hub): Promise<void>;
    send(message: Message): void;
    bind(destination: pubsub.Destination, pattern?: MatchSpec): void;
}
export default HeaderStore;