/**
 * Log levels for structured logging
 */
export declare enum LogLevel {
    Debug = "DEBUG",
    Info = "INFO",
    Warning = "WARNING",
    Error = "ERROR"
}
/**
 * Log entry structure
 */
export interface LogEntry {
    timestamp: Date;
    level: LogLevel;
    operation: string;
    message: string;
    metadata?: Record<string, unknown>;
    error?: Error;
}
/**
 * Structured logger for BrightChain operations
 */
export declare class StructuredLogger {
    private static instance;
    private logs;
    private maxLogs;
    private minLevel;
    private constructor();
    static getInstance(): StructuredLogger;
    setLevel(level: LogLevel): void;
    debug(operation: string, message: string, metadata?: Record<string, unknown>): void;
    info(operation: string, message: string, metadata?: Record<string, unknown>): void;
    warn(operation: string, message: string, metadata?: Record<string, unknown>): void;
    error(operation: string, message: string, error?: Error, metadata?: Record<string, unknown>): void;
    private log;
    private shouldLog;
    private output;
    getLogs(limit?: number): LogEntry[];
    clear(): void;
}
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