import type { AgentPhase } from './types.js';
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
export interface LoggerOptions {
    jsonMode: boolean;
    logFilePath?: string;
}
export declare class Logger {
    private readonly jsonMode;
    private readonly logFilePath?;
    private currentPhase;
    private fileReady;
    constructor(opts: LoggerOptions);
    setPhase(phase: AgentPhase): void;
    info(msg: string, data?: Record<string, unknown>): void;
    warn(msg: string, data?: Record<string, unknown>): void;
    error(msg: string, data?: Record<string, unknown>): void;
    debug(msg: string, data?: Record<string, unknown>): void;
    private write;
    private appendToFile;
}