import { FirebaseStorage } from 'firebase/storage';
/** Shape stored by the query cache. */
export interface QueryCacheEntry {
    query: string;
    results: unknown;
}
/**
 * Gzip-compressed JSON cache backed by the `persistence` Cloud Storage bucket.
 *
 * Path conventions:
 * - Query results:      `portal/projects/{pid}/queries/{id}.json.gz`
 * - Agent sessions:     `portal/projects/{pid}/agent/{id}.json.gz`
 * - User-project data:  `portal/projects/{pid}/users/{uid}/{id}.json.gz`
 */
export declare class CueCache {
    private readonly _storage;
    constructor(_storage: FirebaseStorage);
    getQueryCache(projectId: string, id: string): Promise<QueryCacheEntry | undefined>;
    setQueryCache(projectId: string, id: string, payload: QueryCacheEntry): Promise<void>;
    getAgentSessionCache(projectId: string, id: string): Promise<object | undefined>;
    setAgentSessionCache(projectId: string, id: string, payload: object): Promise<void>;
    getUserProjectCache(projectId: string, userId: string, id: string): Promise<object | undefined>;
    setUserProjectCache(projectId: string, userId: string, id: string, payload: object): Promise<void>;
    private _get;
    private _set;
}