import { Logger } from '@nestjs/common';
import { CustomTransportStrategy, Deserializer, Server } from '@nestjs/microservices';
import { GCPPubSubServerOptions } from './options';
export declare class GCPPubSubStrategy extends Server implements CustomTransportStrategy {
    private readonly opts;
    protected readonly logger: Logger;
    protected readonly deserializer: Deserializer;
    private readonly subscriptions;
    private readonly pubSub;
    private readonly deferred;
    constructor(opts: GCPPubSubServerOptions);
    listen(callback?: () => void): Promise<void>;
    close(): Promise<void>;
    on<EventKey extends string = string, EventCallback extends Function = Function>(event: EventKey, callback: EventCallback): void;
    unwrap<T>(): T;
    private handleMessageWith;
}