import { CueAuth } from './auth';
/**
 * Per-app, per-user data storage. Each app persists its own small JSON blob
 * (capped at 100KB server-side), keyed by a UUID4 the app hardcodes for
 * itself — this namespaces the data so no two apps can collide.
 */
export declare class CueAppData {
    private readonly _auth;
    private readonly _gatewayUrl;
    constructor(_auth: CueAuth, _gatewayUrl: string);
    /**
     * Fetch this app's persisted data for the current user.
     * Returns `null` if nothing has been saved yet.
     */
    get<T = unknown>(appId: string): Promise<T | null>;
    /**
     * Save this app's data for the current user. Overwrites any previous value.
     * The server rejects payloads larger than 100KB.
     */
    set(appId: string, data: unknown): Promise<void>;
}