import { Logger } from "../../util/Logger.js";
export declare class GraphQLSubscriptionExtension {
    static RW_GRAPHQL_CHANNEL: string;
    static META_SUBSCRIBE: string;
    _logger: Logger;
    graphQLSubscriptions: any;
    isGraphQLChannel(channel: any): any;
    addGraphQLChannel(channel: any, graphQLSubscription: any): void;
    removeGraphQLChannel(channel: any): void;
    getGraphQLSubscriptions(): any;
    outgoing(message: any): any;
}