export declare enum LogLevel {
    Debug = 0,
    Info = 1,
    Warn = 2,
    Error = 3
}
export interface LoggerConfig {
    LogLevel?: LogLevel;
    IsJsonType?: boolean;
}
export declare class Logger {
    private readonly config;
    private readonly currentLevel;
    private readonly logger;
    constructor(config?: LoggerConfig);
    debug(msg: string, fields?: Record<string, unknown>): void;
    info(msg: string, fields?: Record<string, unknown>): void;
    warn(msg: string, fields?: Record<string, unknown>): void;
    error(msg: string, fields?: Record<string, unknown>): void;
    /**
     * 内部统一日志输出实现：根据级别做过滤，并选择 JSON 或 logfmt 格式打印。
     */
    private log;
    /**
     * JSON 输出：序列化为单行 JSON 字符串。
     */
    private printJson;
    /**
     * logfmt 输出：key=value key2=value2 ...
     */
    private printLogfmt;
}
declare const _default: Logger;
export default _default;