import { ClientConfig, PubSub, Subscription, Topic, PublishOptions, SubscriberOptions } from '@google-cloud/pubsub';
import { Logger } from '@nestjs/common';
import { ClientProxy, ReadPacket, WritePacket } from '@nestjs/microservices';
import { GCPubSubOptions } from './gc-pubsub.interface';
import { GCPubSubEvents } from './gc-pubsub.events';
export declare class GCPubSubClient extends ClientProxy<GCPubSubEvents> {
    protected readonly options: GCPubSubOptions;
    protected readonly logger: Logger;
    protected readonly topicName: string;
    protected readonly publisherConfig: PublishOptions;
    protected readonly replyTopicName?: string;
    protected readonly replySubscriptionName?: string;
    protected readonly clientConfig: ClientConfig;
    protected readonly subscriberConfig: SubscriberOptions;
    protected readonly noAck: boolean;
    protected readonly useAttributes: boolean;
    protected client: PubSub | null;
    protected replySubscription: Subscription | null;
    protected topic: Topic | null;
    protected init: boolean;
    protected readonly scopedEnvKey: string | null;
    protected readonly checkExistence: boolean;
    constructor(options: GCPubSubOptions);
    close(): Promise<void>;
    connect(): Promise<PubSub>;
    createClient(): PubSub;
    protected dispatchEvent(packet: ReadPacket): Promise<any>;
    protected publish(partialPacket: ReadPacket, callback: (packet: WritePacket) => void): () => boolean;
    handleResponse(message: {
        data: Buffer;
        attributes: Record<string, string>;
    }): Promise<boolean>;
    createIfNotExists(create: () => Promise<any>): Promise<void>;
    unwrap<T>(): T;
}