/**
 * Daemon supervisor - handles the "is the uploader daemon alive? if not,
 * spawn one" check invoked by `MlflowWalSpanExporter` on each WAL append.
 */
/**
 * Probe the daemon's liveness lock with a short timeout.
 *
 * Returns:
 * - `true` if the socket/pipe at `getLockSocketPath()` is currently
 *   accepting connections (i.e. a daemon has bound it).
 * - `false` on any error (ENOENT — no socket file; ECONNREFUSED — a
 *   stale socket file with no listener) or on probe timeout.
 */
export declare function isDaemonAlive(): Promise<boolean>;
/**
 * Resolve the absolute path of the daemon entry point.
 *
 * Precedence:
 *   1. `MLFLOW_TRACE_DAEMON_EXECUTABLE` env var — used by tests and
 *      advanced operators who want to override the bundled daemon.
 *   2. The bundled daemon at `<@mlflow/core install dir>/bundle/daemon.cjs`.
 */
export declare function resolveDaemonEntry(): string;
/**
 * Fork a detached daemon process. Assumes no daemon is currently bound —
 * the caller is responsible for guarding with {@link isDaemonAlive}.
 */
export declare function spawnDaemon(): void;
/**
 * Ensure a daemon is alive; spawn one if not.
 */
export declare function ensureDaemon(): Promise<void>;