/// <reference types="node" />
import { Server } from 'node:http';
import { OnApplicationBootstrap, OnApplicationShutdown } from '@nestjs/common';
import { BehaviorSubject, Observable, Subject } from 'rxjs';
import { Logger } from '../logger/logger';
export declare abstract class BaseAppService implements OnApplicationBootstrap, OnApplicationShutdown {
    protected readonly logger: Logger;
    protected server: Server | undefined;
    protected started: BehaviorSubject<boolean>;
    protected terminating: Subject<boolean>;
    protected constructor(logger: Logger);
    setServer(server: Server): void;
    onApplicationBootstrap(): void;
    onApplicationShutdown(signal: string): Promise<void>;
    hasStarted(): Observable<boolean>;
    isTerminating(): Observable<boolean>;
    protected closeDatabaseConnection(): Promise<void>;
}