/**
 * App version resolution and distributed cache management.
 *
 * The engine caches the deployed app version locally to avoid
 * hitting the store on every message. During hot-deploys the cache
 * switches to `nocache` mode until the target version appears,
 * then resumes caching.
 */
import { ILogger } from '../logger';
import { StoreService } from '../store';
import { AppVID } from '../../types/app';
import { CacheMode } from '../../types/cache';
import { HotMeshApps } from '../../types/hotmesh';
import { ProviderClient, ProviderTransaction } from '../../types/provider';
interface VersionContext {
    appId: string;
    guid: string;
    apps: HotMeshApps | null;
    cacheMode: CacheMode;
    untilVersion: string | null;
    store: StoreService<ProviderClient, ProviderTransaction>;
    logger: ILogger;
}
/**
 * Resolves the distributed executable version, retrying with a delay
 * to allow deployment race conditions to settle.
 */
export declare function fetchAndVerifyVID(instance: VersionContext, vid: AppVID, count?: number): Promise<AppVID>;
export declare function getVID(instance: VersionContext, vid?: AppVID): Promise<AppVID>;
export declare function setCacheMode(instance: VersionContext, cacheMode: CacheMode, untilVersion: string): void;
export {};