export declare class Logger {
    private target;
    private filePath?;
    private level;
    constructor(options: {
        level?: "debug" | "info" | "warn" | "error";
        target?: "auto" | "stdout" | "file";
        filePath?: string;
    });
    private detectTarget;
    private ensureLogDirectory;
    debug(message: string, data?: Record<string, any>): void;
    info(message: string, data?: Record<string, any>): void;
    warn(message: string, data?: Record<string, any>): void;
    error(message: string, data?: Record<string, any>): void;
    private log;
}
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