export interface LogEntry {
    id: number;
    timestamp: string;
    type: 'request' | 'system';
    level: LogLevel;
    message: string;
    details?: Record<string, unknown>;
}
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
export declare class Logger {
    private entries;
    private nextId;
    private maxEntries;
    private logDir?;
    private logLevel;
    private currentDate;
    private currentLogPath;
    constructor(maxEntries?: number, logDir?: string, logLevel?: LogLevel);
    /** 启动时从文件加载历史日志到内存 */
    private loadFromFiles;
    /** 获取日志文件列表（按日期从新到旧） */
    private getLogFiles;
    /** 读取指定日期的日志文件内容 */
    private readFile;
    /** 直接从日志文件读取条目，用于弥补内存不足的历史日志 */
    private readFromFiles;
    private getLogPath;
    log(type: LogEntry['type'], message: string, details?: Record<string, unknown>, level?: LogLevel, curl?: string): void;
    getLevel(): LogLevel;
    setLevel(level: LogLevel): void;
    getLogs(limit?: number, before?: number, level?: LogLevel, type?: string, date?: string): LogEntry[];
    getStats(): {
        total: number;
        requestCount: number;
        systemCount: number;
    };
}
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