import EventEmitter from "node:events";
import net from "node:net";
import { URL } from "node:url";
import { DebugLoggerFunction } from "node:util";
import buildLookupFunction from "./dns-cache.js";
/**
 * @emits idle The socket has no more pending messages. We use this event
 * to be sure the socket is not active anymore before closing it.
 */
export declare abstract class Socket extends EventEmitter {
    protected hostname: string;
    protected port: number;
    protected connected: boolean;
    protected debug: typeof console.log;
    protected onError: (error: Error) => void;
    protected _pendingMessages: number;
    protected closeTimeout: number;
    protected constructor(url: URL, onError?: (error: Error) => void, debug?: DebugLoggerFunction);
    isConnected(): boolean;
    /**
     * Number of messages that are still being sent.
     */
    get pendingMessages(): number;
    /**
     * Whether the socket has pending messages or not.
     * Used to check if the socket is still active.
     */
    get idle(): boolean;
    abstract connect(): Promise<boolean>;
    abstract send(data: string): void;
    abstract close(): Promise<void>;
}
export declare class SocketTcp extends Socket {
    private socket;
    private reconnectCb;
    private closing;
    private connectCalled;
    private createConnection;
    constructor(url: URL, onError?: (error: Error) => void, debug?: DebugLoggerFunction, createConnection?: typeof net.createConnection);
    private _connect;
    connect(): Promise<boolean>;
    send(data: string): void;
    close(): Promise<void>;
}
type LookupFn = (_: string, __: 4 | 6, cb: (error?: NodeJS.ErrnoException | null, address?: string, family?: 4 | 6) => void) => void;
export declare class SocketUdp extends Socket {
    private socket;
    private udpVersion;
    lookup: LookupFn | undefined;
    constructor(url: URL, onError?: (error: Error) => void, dnsCache?: boolean, dnsCacheTTL?: number, debug?: DebugLoggerFunction, buildLookup?: typeof buildLookupFunction);
    connect(): Promise<boolean>;
    send(data: string): void;
    close(): Promise<void>;
}
export {};