interface FetchOptions {
    platform: 'reddit' | 'twitter';
    url: string;
    apiEndpoint: string;
    dataValidator: (data: any) => boolean;
    onDataUpdate: (data: any) => void;
    onError: (error: string) => void;
    onLoading: (loading: boolean) => void;
}
export declare class SocialEmbedCache {
    private static instance;
    static getInstance(): SocialEmbedCache;
    getFromMemory(url: string): any | null;
    setInMemory(url: string, data: any): void;
    /**
     * Memory → proxy. Kept the historical name so the embed clients'
     * call sites are unchanged.
     */
    fetchWithHierarchy(options: FetchOptions): Promise<void>;
    /**
     * Returns the validated payload, `null` for a structured "content
     * unavailable" 404, and throws for everything else. Concurrent calls for
     * the same URL share one request.
     */
    private fetchFromProxy;
}
export declare const socialCache: SocialEmbedCache;
export {};
//# sourceMappingURL=social-embed-cache.d.ts.map