import * as net from "node:net";
import * as stream from "node:stream";
import { LogContext } from "../commons/log_context.js";
import { SyslogLevel } from "../commons/syslog.js";
import { Node } from "../commons/node.js";
export interface SocketHandlerOptions {
    socket: net.Socket;
    reviver?: (this: unknown, key: string, value: unknown) => unknown;
    replacer?: (this: unknown, key: string, value: unknown) => unknown;
    space?: string | number;
    level?: SyslogLevel;
    payloadSizeLimit?: number;
    ingressQueueThreshold?: number;
}
export declare class SocketHandler<MessageT = string> extends Node<LogContext<MessageT>, LogContext<MessageT>> {
    level: SyslogLevel;
    protected _space?: string | number;
    protected _replacer?: (this: unknown, key: string, value: unknown) => unknown;
    protected _reviver?: (this: unknown, key: string, value: unknown) => unknown;
    protected _socket: net.Socket;
    protected _ingressQueue: Buffer;
    protected _payloadSizeLimit: number;
    protected _ingressQueueThreshold?: number;
    constructor(options: SocketHandlerOptions, duplexOptions?: stream.DuplexOptions);
    protected _push: () => void;
    protected _serializeMessage: (message: LogContext<MessageT>) => Buffer;
    protected _deserializeMessage: (data: Buffer) => LogContext<MessageT>;
    setLevel: (level: SyslogLevel) => void;
}