import type { SubscriberRuntimeDescriptor } from "@voyant-travel/core";
import type { KVStore } from "@voyant-travel/utils/cache";
/** Long fallback bound; normal freshness comes from exact event invalidation. */
export declare const DEPARTURES_DOC_TTL_SECONDS: number;
export declare function departuresDocPrefix(productId: string): string;
export declare function departuresDocKey(productId: string, query: Record<string, unknown>): string;
/** Best-effort read-through cache; failures degrade to the live query. */
export declare function readThroughDepartures<T>(c: {
    env?: {
        CACHE?: KVStore;
    };
}, key: string, compute: () => Promise<T>): Promise<T>;
/** Delete every query variant for one product. */
export declare function invalidateDeparturesReadModel(kv: KVStore, productId: string): Promise<void>;
export declare const STOREFRONT_AVAILABILITY_READ_MODEL_SUBSCRIBER_ID = "@voyant-travel/storefront#subscriber.invalidate-departures-on-availability-change";
export declare function createStorefrontAvailabilityReadModelInvalidationSubscriber(logger?: Pick<Console, "warn">): SubscriberRuntimeDescriptor;
export declare const storefrontAvailabilityReadModelInvalidationSubscriber: SubscriberRuntimeDescriptor;