import { ClientConfig, PubSub, SubscriptionOptions } from "@google-cloud/pubsub";
import { DocumentNode, GraphQLSchema } from "graphql";
import { EventBusPlugin, EventBusSubscriberCb, GraphQLEventbusMetadata } from "graphql-eventbus";
export type PubSubEventBusConfig = {
    clientConfig?: ClientConfig;
    publisher?: {
        schema: GraphQLSchema;
    };
    subscriber?: {
        queries: DocumentNode;
        schema: GraphQLSchema;
        cb: EventBusSubscriberCb;
        options?: SubscriptionOptions;
        skipTopics?: string[];
        includeTopics?: string[];
        fanoutTopics?: string[];
    };
    plugins?: EventBusPlugin[];
    serviceName: string;
    isDarkRelease?: boolean;
};
export declare class PubSubEventBus {
    private config;
    pubsubClient: PubSub;
    private publishTopics;
    private subscriptions;
    private bus;
    constructor(config: PubSubEventBusConfig);
    closeConsumer: () => Promise<void>;
    closePublisher: () => Promise<void>;
    init: () => Promise<void>;
    publish: (a: {
        topic: string;
        payload: Record<string, unknown>;
        metadata?: Partial<GraphQLEventbusMetadata>;
        attributes?: {
            [k: string]: string;
        } | null | undefined;
    }) => Promise<void>;
}