export type ThumbnailState = 'loading' | 'ready' | 'missing';
type ThumbnailCacheEntry = {
    state: ThumbnailState;
    url: string | null;
    expiresAt: number | null;
};
export declare const THUMBNAIL_FAILURE_TTL_MS = 30000;
export declare function clearThumbnailCache(): void;
export declare function getCachedThumbnail(cacheKey: string): ThumbnailCacheEntry | undefined;
export declare function setCachedThumbnail(cacheKey: string, entry: Omit<ThumbnailCacheEntry, 'expiresAt'> & {
    expiresAt?: number | null;
}): void;
export {};
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