import { ClientConfig, Message, PubSub, Subscription, Topic } from '@google-cloud/pubsub';
import { PublishOptions } from '@google-cloud/pubsub/build/src/publisher';
import { SubscriberOptions } from '@google-cloud/pubsub/build/src/subscriber';
import { CustomTransportStrategy, Server } from '@nestjs/microservices';
import { Logger } from '@nestjs/common';
import { GCPubSubOptions } from './interfaces';
export declare class GCPubSubServer extends Server implements CustomTransportStrategy {
    protected readonly options: GCPubSubOptions;
    protected logger: Logger;
    protected readonly clientConfig: ClientConfig;
    protected readonly topicName: string;
    protected readonly publisherConfig: PublishOptions;
    protected readonly subscriptionName: string;
    protected readonly subscriberConfig: SubscriberOptions;
    protected readonly noAck: boolean;
    protected client: PubSub | null;
    protected readonly topics: Map<string, Topic>;
    protected subscription: Subscription | null;
    constructor(options: GCPubSubOptions);
    listen(callback: () => void): Promise<void>;
    close(): Promise<void>;
    handleMessage(message: Message): Promise<any>;
    sendMessage<T = any>(message: T, replyTo: string, id: string): Promise<void>;
    createIfNotExists(create: () => Promise<any>): Promise<void>;
    createClient(): PubSub;
}