/**
 * Logger Service
 *
 * Configurable logging system for the SDK
 * Allows merchants to control log output and integrate with their own logging systems
 */
export type LogLevel = 'debug' | 'info' | 'warn' | 'error' | 'none';
export interface LogEntry {
    level: LogLevel;
    message: string;
    timestamp: number;
    data?: unknown;
    context?: string;
}
export interface LoggerConfig {
    /**
     * Minimum log level to output
     * - 'debug': All logs
     * - 'info': Info, warn, error
     * - 'warn': Warn and error only
     * - 'error': Error only
     * - 'none': No logs
     */
    level: LogLevel;
    /**
     * Custom log handler
     * If provided, logs will be sent here instead of console
     */
    onLog?: (entry: LogEntry) => void;
    /**
     * Whether to include timestamps in console output
     */
    showTimestamp?: boolean;
    /**
     * Context prefix for all logs (e.g., widget instance ID)
     */
    context?: string;
}
export declare class Logger {
    private config;
    private static readonly LOG_LEVELS;
    private static readonly LEVEL_COLORS;
    private static readonly RESET_COLOR;
    constructor(config: LoggerConfig);
    /**
     * Log debug message (verbose details)
     */
    debug(message: string, data?: unknown): void;
    /**
     * Log info message (general information)
     */
    info(message: string, data?: unknown): void;
    /**
     * Log warning message (potential issues)
     */
    warn(message: string, data?: unknown): void;
    /**
     * Log error message (errors and failures)
     */
    error(message: string, data?: unknown): void;
    /**
     * Core logging method
     */
    private log;
    /**
     * Check if log level should be output
     */
    private shouldLog;
    /**
     * Output to console with formatting
     */
    private logToConsole;
    /**
     * Create a child logger with additional context
     */
    child(context: string): Logger;
    /**
     * Update logger configuration
     */
    setLevel(level: LogLevel): void;
}
/**
 * Create a default logger (production-safe: level 'none')
 */
export declare function createDefaultLogger(config?: Partial<LoggerConfig>): Logger;
/**
 * Create a development logger (verbose)
 */
export declare function createDevLogger(config?: Partial<LoggerConfig>): Logger;
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