import type { ManagedSession, SessionStatus, Heartbeat, StatusInput, TmuxState } from "./types.js";
export declare const HEARTBEAT_INTERVAL_MS = 15000;
export declare const HEARTBEAT_STALE_MS = 60000;
export declare const TMUX_ACTIVE_MS = 5000;
export interface ComputedStatus {
    status: SessionStatus;
    note?: string;
    error?: string;
}
export declare function readHeartbeat(sessionId: string): Promise<Heartbeat | undefined>;
export declare function computeStatus(input: StatusInput): ComputedStatus;
export declare function applyComputedStatus(session: ManagedSession, computed: ComputedStatus, now?: number, heartbeat?: Heartbeat): ManagedSession;
export declare function markAcknowledged(session: ManagedSession, now?: number): ManagedSession;
export declare function tmuxMissing(error?: string): TmuxState;