/**
 * Log levels ordered by severity (higher numbers = more verbose)
 */
export declare enum LogLevel {
    ERROR = 0,
    WARN = 1,
    INFO = 2,
    HTTP = 3,
    VERBOSE = 4,
    DEBUG = 5,
    SILLY = 6
}
/**
 * Error information structure for log entries
 */
export interface LogError {
    name: string;
    message: string;
    stack?: string | undefined;
    code?: string | number | undefined;
}
/**
 * Service context information - flexible to allow additional properties
 */
export interface LogContext {
    service: string;
    version: string;
    environment: string;
    hostname?: string | undefined;
    pid?: number | undefined;
    thread?: string | undefined;
    [key: string]: any;
}
/**
 * Complete log entry structure
 */
export interface LogEntry {
    level: LogLevel;
    message: string;
    timestamp: Date;
    correlationId?: string | undefined;
    requestId?: string | undefined;
    userId?: string | undefined;
    context?: LogContext | undefined;
    metadata?: Record<string, any> | undefined;
    duration?: number | undefined;
    error?: LogError | undefined;
    tags?: string[] | undefined;
}
/**
 * Timer interface for performance tracking
 */
export interface LogTimer {
    end: (message?: string, metadata?: Record<string, any>) => number;
}
/**
 * Transport interface for log output destinations
 */
export interface LogTransport {
    name: string;
    level: LogLevel;
    write(entry: LogEntry): Promise<void>;
    flush?(): Promise<void>;
    close?(): Promise<void>;
}
/**
 * Formatter interface for log output formatting
 */
export interface LogFormatter {
    format(entry: LogEntry): string;
}
/**
 * Logger configuration options
 */
export interface LoggerOptions {
    level: LogLevel;
    transports: LogTransport[];
    context?: Partial<LogContext> | undefined;
    enableCorrelation?: boolean | undefined;
    sanitize?: boolean | undefined;
    sanitizeFields?: string[] | undefined;
    formatter?: LogFormatter | undefined;
    onError?: ((error: Error, transport: string) => void) | undefined;
    /**
     * Per-context log level overrides.
     * Keys are context identifiers (e.g., 'nevar.audit', 'nevar.engine').
     * When logging with a matching context, the context-specific level is used
     * instead of the global level.
     */
    contextLevels?: Record<string, LogLevel> | undefined;
}
/**
 * Console transport configuration options
 */
export interface ConsoleTransportOptions {
    level?: LogLevel | undefined;
    formatter?: LogFormatter | undefined;
}
/**
 * File transport configuration options
 */
export interface FileTransportOptions {
    filename: string;
    level?: LogLevel | undefined;
    formatter?: LogFormatter | undefined;
    maxSize?: number | undefined;
    maxFiles?: number | undefined;
    createDir?: boolean | undefined;
}
/**
 * HTTP transport configuration options
 */
export interface HTTPTransportOptions {
    url: string;
    level?: LogLevel | undefined;
    headers?: Record<string, string> | undefined;
    timeout?: number | undefined;
    batchSize?: number | undefined;
    flushInterval?: number | undefined;
    retries?: number | undefined;
}
/**
 * Database transport configuration options
 */
export interface DatabaseTransportOptions {
    level?: LogLevel | undefined;
    connectionString: string;
    tableName: string;
    maxPoolSize?: number | undefined;
}
/**
 * JSON formatter configuration options
 */
export interface JSONFormatterOptions {
    prettyPrint?: boolean | undefined;
    space?: number | undefined;
    includeStack?: boolean | undefined;
}
/**
 * Text formatter configuration options
 */
export interface TextFormatterOptions {
    includeStack?: boolean | undefined;
    colorize?: boolean | undefined;
    dateFormat?: string | undefined;
}
/**
 * Structured formatter configuration options
 */
export interface StructuredFormatterOptions {
    prefix?: string | undefined;
    delimiter?: string | undefined;
    includeTimestamp?: boolean | undefined;
    includeHostname?: boolean | undefined;
}
/**
 * Performance metrics for log monitoring
 */
export interface LogMetrics {
    totalLogs: number;
    logsByLevel: Record<LogLevel, number>;
    errors: number;
    averageProcessingTime: number;
    transportFailures: Record<string, number>;
}
/**
 * Log level string mappings
 */
export declare const LOG_LEVEL_NAMES: Record<LogLevel, string>;
/**
 * Default sanitization fields
 */
export declare const DEFAULT_SANITIZE_FIELDS: string[];
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