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 $log: unique symbol;
export interface BaseLoggerOptions<MessageT> {
    level?: SyslogLevel;
    name?: string;
    queueSizeLimit?: number;
    parent?: Logger<MessageT>;
    captureStackTrace?: boolean;
    captureISOTime?: boolean;
}
export declare abstract class BaseLogger<MessageT = string> extends Node<LogContext<MessageT>, LogContext<MessageT>> {
    level: SyslogLevel;
    protected _name?: string;
    protected _captureStackTrace: boolean;
    protected _captureISOTime: boolean;
    protected _queueSizeLimit?: number;
    constructor(options?: BaseLoggerOptions<MessageT>, streamOptions?: stream.TransformOptions);
    protected [$log](message: MessageT, label: string | undefined, level: SyslogLevel): void;
}
export declare class Logger<MessageT = string> extends BaseLogger<MessageT> {
    debug: (message: MessageT, label?: string) => void;
    info: (message: MessageT, label?: string) => void;
    notice: (message: MessageT, label?: string) => void;
    warn: (message: MessageT, label?: string) => void;
    error: (message: MessageT, label?: string) => void;
    crit: (message: MessageT, label?: string) => void;
    alert: (message: MessageT, label?: string) => void;
    emerg: (message: MessageT, label?: string) => void;
    setLevel: (level: SyslogLevel) => void;
}
export declare const root: Logger<any>;