/**
 * Lightweight session existence verifier.
 *
 * Provides secondary existence verification via `client.session.get()`.
 * The legacy `checkSession()` status-map polling and `clearTask()` lifecycle
 * tracking have been removed — those responsibilities moved to the
 * event-driven dispatch pipeline.
 *
 * This module is read-only: it does NOT modify task state,
 * abort sessions, or interact with the manager/poller directly.
 */
import type { ISessionClient } from "../../platform/ports/session-client.ts";
/**
 * Result of a session existence check.
 *
 * Retained for backward compatibility — the `active` / `gone` / `uncertain` /
 * `present_idle` variants were previously produced by the now-removed
 * `checkSession()` method. External consumers may still reference this type.
 */
export interface SessionMonitorResult {
    type: "active" | "gone" | "uncertain" | "present_idle";
    /** The raw status object from the map when present, undefined when absent */
    status?: {
        type: string;
    };
}
export declare class SessionMonitor {
    /**
     * Secondary existence verification using `client.session.get()`.
     *
     * Called when the event-driven pipeline detects a session may have
     * disappeared. Uses the SDK directly to confirm whether the session
     * truly no longer exists.
     *
     * @param client     The session client (ISessionClient)
     * @param sessionId  The session ID to verify
     * @returns
     *   - `"exists"`:  session.get returned data (session still alive)
     *   - `"missing"`: 404 or not-found error (session deleted)
     *   - `"unknown"`: network error, unexpected response, can't determine
     */
    verifyExistence(client: ISessionClient, sessionId: string): Promise<"exists" | "missing" | "unknown">;
}
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