import { PubSub, Subscription, Message } from '@google-cloud/pubsub';
import { Server, CustomTransportStrategy } from '@nestjs/microservices';
import { GCloudPubSubServerOptions } from '../interfaces/gcloud-pub-sub.interface';
export declare class GCloudPubSubServer extends Server implements CustomTransportStrategy {
    readonly options: GCloudPubSubServerOptions;
    client: PubSub;
    subscriptions: Subscription[];
    isShuttingDown: boolean;
    constructor(options: GCloudPubSubServerOptions);
    listen(callback: () => void): void;
    handleErrorFactory(subscription: Subscription, subcriptionName: string): (error: any) => void;
    close(): void;
    handleMessageFactory(subscriptionName: string): (message: Message) => Promise<void>;
}