/**
 * Cross-process exclusion lock for the daemon singleton.
 *
 * The lock is POSIX-only; on Windows the daemon's named-pipe path is
 * kernel-refcounted and provides cross-process exclusion natively, so
 * `acquireLock` skips this module on `process.platform === 'win32'`.
 */
export interface PidLock {
    release(): Promise<void>;
}
/**
 * Attempt to claim the daemon's cross-process PID lock.
 *
 * Returns a {@link PidLock} on success, or `null` when another live
 * process already holds it. Throws on unrecoverable I/O errors
 * (`EACCES`, `ENOSPC`, missing WAL dir, etc.) — callers should treat
 * a throw as "daemon cannot start" rather than "concede to sibling."
 */
export declare function tryAcquirePidLock(): Promise<PidLock | null>;
/**
 * Read the pid recorded in the daemon's lockfile, or `null` if the
 * file is missing or unparseable. Provided as a diagnostic helper for
 * callers (e.g. supervisor) that want to log "who owns the lock right
 * now"; not used by acquisition itself.
 */
export declare function readLockHolderPid(): Promise<number | null>;