import type { IndexCacheKey } from './cache-keys.js';
export type IndexInvalidationMode = 'incremental' | 'full';
export interface IndexInvalidation {
    invalidatedAt: string;
    mode: IndexInvalidationMode;
}
export interface IndexBlobMeta {
    syncedAt: string;
    schemaVersion: number;
    assetCount: number;
    referenceCount: number;
}
export interface IndexCacheStore {
    getInvalidation(key: IndexCacheKey): Promise<IndexInvalidation | null>;
    setInvalidation(key: IndexCacheKey, inv: IndexInvalidation): Promise<void>;
    clearInvalidation(key: IndexCacheKey): Promise<void>;
    getBlob(key: IndexCacheKey): Promise<{
        meta: IndexBlobMeta;
        data: Uint8Array;
    } | null>;
    putBlob(key: IndexCacheKey, meta: IndexBlobMeta, data: Uint8Array): Promise<void>;
    deleteBlob(key: IndexCacheKey): Promise<void>;
    tryAcquireSyncLock(key: IndexCacheKey, holderId: string, ttlSeconds: number): Promise<boolean>;
    releaseSyncLock(key: IndexCacheKey, holderId: string): Promise<void>;
}
declare const INDEX_BLOB_TTL_SECONDS: number;
export { INDEX_BLOB_TTL_SECONDS };
export declare function getIndexCacheStore(): IndexCacheStore;
/** @internal Reset singleton between tests. */
export declare function resetDefaultIndexCacheStoreForTests(): void;
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