import * as fs from "node:fs";
import * as stream from "node:stream";
import { LogContext } from "../commons/log_context.js";
import { Node } from "../commons/node.js";
import { SyslogLevel } from "../commons/syslog.js";
export declare const $rotate: unique symbol;
export declare const $option: unique symbol;
export declare const $path: unique symbol;
export declare const $writeStream: unique symbol;
export declare const $size: unique symbol;
export declare const $level: unique symbol;
export declare const $rotationLimit: unique symbol;
export declare const $maxSize: unique symbol;
export declare const $encoding: unique symbol;
export declare const $mode: unique symbol;
export declare class RotatingFileHandlerTransform<MessageT> extends stream.Transform {
    protected [$path]: string;
    protected [$writeStream]: fs.WriteStream;
    protected [$size]: number;
    protected [$level]: SyslogLevel;
    protected [$rotationLimit]: number;
    protected [$maxSize]: number;
    protected [$mode]: number;
    protected [$encoding]: NodeJS.BufferEncoding;
    constructor(options: RotatingFileHandlerOptions, transformOptions?: stream.TransformOptions);
    _transform(logContext: LogContext<MessageT>, encoding: BufferEncoding, callback: stream.TransformCallback): void;
    protected [$rotate](): Promise<void>;
}
export interface RotatingFileHandlerOptions {
    path: string;
    rotationLimit?: number;
    maxSize?: number;
    encoding?: BufferEncoding;
    mode?: number;
    level?: SyslogLevel;
    flags?: string;
}
export declare class RotatingFileHandler<MessageT = string> extends Node<LogContext<MessageT>, never, RotatingFileHandlerTransform<MessageT>> {
    constructor(options: RotatingFileHandlerOptions, transformOptions?: stream.TransformOptions);
    setLevel: (level: SyslogLevel) => void;
    get level(): SyslogLevel;
}