/**
 * The daemon's shutdown sequence with a DEADLINE (crew#471).
 *
 * `wicked-crew serve` answered SIGTERM by reaping its bridge children and closing the engine
 * subscription, then exiting. While the engine's actor was busy planning a large launch those
 * steps never finished, so the daemon ignored `pkill` and needed SIGKILL. The steps still run
 * first, best-effort; when they have not finished within the deadline the process exits anyway.
 */
/** How long the graceful half of a shutdown may take before the process exits regardless. */
export declare const SHUTDOWN_DEADLINE_MS = 5000;
/**
 * Run `steps`, then `exit(0)`, and `exit(0)` at `deadlineMs` if the steps are still running.
 * A step that throws never blocks the exit. `exit` is called exactly once.
 */
export declare function shutdownWithDeadline(steps: () => Promise<void>, exit: (code: number) => void, deadlineMs?: number, warn?: (message: string) => void): void;
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