import { type SceneActivation, type ScenePermission } from './contracts.js';
import type { SceneContextProvider } from './execution.js';
import { SceneRepository } from './repository.js';
/** Observes only explicitly delegated threads; the host owns scan scheduling. */
export declare class SceneMailObservationService {
    private readonly repository;
    private readonly provider;
    private readonly authorize;
    private readonly clock;
    private readonly intervalMs;
    private readonly itemTimeoutMs;
    private nextScanAt;
    private readonly failures;
    constructor(repository: SceneRepository, provider: SceneContextProvider, authorize: (activation: SceneActivation) => Promise<ScenePermission>, clock?: () => number, intervalMs?: number, itemTimeoutMs?: number);
    scan(signal: AbortSignal, afterId?: string, progress?: (id: string) => void): Promise<{
        changed: number;
        unavailable: number;
        nextCursor: string | null;
    }>;
}