/**
 * Append-only sink that mirrors the daemon's console output to a file the
 * `mnemonik-scanner log` command can tail. Rotates to `<file>.old` once the
 * file would pass `maxSize`, so a daemon that runs for weeks can't grow it
 * without bound. Every operation is best-effort: a logging failure must never
 * crash the daemon, so all filesystem errors are swallowed.
 */
export declare function createRotatingFileSink(logFile: string, maxSize: number): (chunk: string) => void;
/**
 * Tee `process.stdout`/`process.stderr` into `logFile` on top of their normal
 * destination. This is what makes `mnemonik-scanner log` reflect live activity
 * regardless of how the daemon is supervised: under systemd stdout is wired to
 * the journal (a socket), under a bare shell to the terminal — either way the
 * file now receives the same lines. Call once at daemon start, before the
 * daemon writes anything worth capturing.
 */
export declare function installFileLogging(logFile: string, maxSize: number): void;