/**
 * Logger utility for SAP MCP Server
 *
 * Provides structured logging with:
 * - Configurable log levels
 * - JSON or pretty format
 * - File output support
 * - Timestamp and context
 */
/**
 * Type alias for log level values used by the SAP MCP runtime.
 */
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
/**
 * Type alias for log format values used by the SAP MCP runtime.
 */
export type LogFormat = 'json' | 'pretty';
/**
 * Contract describing log options data used by the SAP MCP runtime.
 */
export interface LogOptions {
    level?: LogLevel;
    format?: LogFormat;
    file?: string;
}
/**
 * @name redactSensitiveString
 * @description Redacts URL query secrets and obvious inline secret assignments before writing logs.
 */
export declare function redactSensitiveString(value: string): string;
/**
 * Initialize logger with options
 */
export declare function initLogger(options?: LogOptions): void;
/**
 * Logger instance
 */
export declare const logger: {
    debug(message: string, data?: unknown): void;
    info(message: string, data?: unknown): void;
    warn(message: string, data?: unknown): void;
    error(message: string, data?: unknown): void;
    /**
     * Log startup banner
     */
    startup(config: {
        mode: string;
        rpcUrl: string;
        programId: string;
        version?: string;
    }): void;
};
/**
 * Set log level dynamically
 */
export declare function setLogLevel(level: LogLevel): void;
/**
 * Set log format dynamically
 */
export declare function setLogFormat(format: LogFormat): void;
/**
 * Set log file dynamically
 */
export declare function setLogFile(file: string | undefined): void;
/**
 * Get current logger configuration
 */
export declare function getLoggerConfig(): LogOptions;
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