/**
 * Memory Journal MCP Server - Logger
 *
 * Centralized logging to stderr only (stdout reserved for MCP protocol).
 * Follows RFC 5424 severity levels.
 * Automatically sanitizes error fields to prevent token leakage.
 */
type LogLevel = 'debug' | 'info' | 'notice' | 'warning' | 'error' | 'critical';
interface LogContext {
    module?: string;
    operation?: string;
    entityId?: string | number;
    [key: string]: unknown;
}
declare class Logger {
    private minLevel;
    constructor(level?: LogLevel);
    private shouldLog;
    private log;
    debug(message: string, context?: LogContext): void;
    info(message: string, context?: LogContext): void;
    notice(message: string, context?: LogContext): void;
    warning(message: string, context?: LogContext): void;
    error(message: string, context?: LogContext): void;
    critical(message: string, context?: LogContext): void;
    setLevel(level: LogLevel): void;
}
export declare const logger: Logger;
export {};
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