/**
 * Queue job store for worker queues (MongoDB or Upstash Redis).
 *
 * Mirrors the worker_jobs pattern but optimized for queues:
 * - MongoDB: collection `queue_jobs` (configurable via MONGODB_QUEUE_JOBS_COLLECTION)
 * - Upstash Redis: JSON blob per queue job with compact step entries
 *
 * This module is runtime-only (used by Lambda workers). Next.js APIs can read
 * the same collections/keys to show queue progress.
 */
declare function upsertInitialQueueJob(options: {
    queueJobId: string;
    queueId: string;
    firstWorkerId: string;
    firstWorkerJobId: string;
    metadata?: Record<string, any>;
    userId?: string;
}): Promise<void>;
declare function updateQueueJobStepInStore(options: {
    queueJobId: string;
    queueId?: string;
    stepIndex: number;
    workerId: string;
    workerJobId: string;
    status: 'running' | 'awaiting_approval' | 'completed' | 'failed';
    input?: unknown;
    output?: unknown;
    error?: {
        message: string;
    };
}): Promise<void>;
declare function appendQueueJobStepInStore(options: {
    queueJobId: string;
    queueId?: string;
    workerId: string;
    workerJobId: string;
}): Promise<void>;
/**
 * Load a queue job by ID (for mapping context: previous step outputs).
 * Used by wrapHandlerForQueue for chain mapping and HITL resume (`previousOutputs`).
 */
declare function getQueueJob(queueJobId: string): Promise<{
    id: string;
    queueId: string;
    status: string;
    steps: Array<{
        workerId: string;
        workerJobId: string;
        status: string;
        output?: unknown;
    }>;
} | null>;

export { appendQueueJobStepInStore, getQueueJob, updateQueueJobStepInStore, upsertInitialQueueJob };