import { MatimoLogger, LogLevel, LoggerConfig } from './logger.js';
/**
 * Winston-based logger implementation for Matimo SDK
 * Provides structured logging with optional JSON format for production use.
 * Supports environment variable overrides for log level and format.
 *
 * @internal
 */
export declare class WinstonMatimoLogger implements MatimoLogger {
    private winstonLogger;
    constructor(config: {
        logLevel: LogLevel;
        logFormat: 'json' | 'simple';
    });
    private mapLogLevel;
    private createFormat;
    info(message: string, meta?: Record<string, unknown>): void;
    warn(message: string, meta?: Record<string, unknown>): void;
    error(message: string, meta?: Record<string, unknown>): void;
    debug(message: string, meta?: Record<string, unknown>): void;
}
/**
 * Create a logger from config
 * Uses Winston if no custom logger provided, otherwise returns the custom logger
 *
 * @internal
 */
export declare function createLogger(config: LoggerConfig): MatimoLogger;
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