/**
 * STDIO-safe logger.
 *
 * MCP servers running over the STDIO transport use stdout/stderr to exchange
 * protocol messages, so we cannot use the default `console.log`. We accept a
 * `logger` option on the public API or the legacy logger configured through
 * `setLogger`; when neither is configured, log calls are silently dropped.
 * Errors that affect tracking should still be observable in apps that want
 * them, so the consumer can plug in any function (e.g. `console.error` for
 * non-STDIO transports, a file logger, etc.).
 */
export type LoggerFn = (message: string) => void;
export declare function setLogger(logger: LoggerFn | undefined): void;
/**
 * Creates a safe logger for one instrumented server. A server-specific logger
 * remains isolated, while an omitted logger preserves the legacy `setLogger`
 * fallback.
 */
export declare function createLogger(logger: LoggerFn | undefined): LoggerFn;
/** Logs through the legacy module-level logger configured by {@link setLogger}. */
export declare function log(message: string): void;
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