/**
 * thumbnailCache
 *
 * In-memory, client-side cache for rendered component-preview HTML: a
 * module-level Map that survives editor/document remounts within a single
 * page load (Puck is force-remounted via `key` on every document switch,
 * which would otherwise re-render every preview from scratch).
 *
 * Deliberately NOT persisted to localStorage: the cached value is later
 * injected via `dangerouslySetInnerHTML` (see LiveThumbnail), and localStorage
 * is writable by any same-origin script. Persisting it would let a same-origin
 * write to a `p1-thumb:*` key plant markup that gets trusted and replayed on a
 * future load. Keeping the cache in-memory only means an attacker would need
 * live script execution in this exact session to influence it — at which
 * point they already have full DOM control and this cache buys them nothing.
 *
 * A preview depends only on component name + defaultProps, NOT on the document
 * being edited, so entries are reused across every page. The key embeds a hash
 * of the defaultProps plus a caller-supplied version so stale entries
 * invalidate when a component's inputs change.
 */
/**
 * Build a cache key for a component preview. Changing `defaultProps` or
 * `version` yields a different key, so cached previews invalidate.
 */
export declare function makeThumbnailKey(name: string, defaultProps: unknown, version?: string): string;
/** Cache key for a component preview, shared by LiveThumbnail and ThumbnailCard. */
export declare function getThumbnailCacheKey(config: {
    components?: Record<string, {
        defaultProps?: unknown;
    }>;
} | undefined, name: string, version?: string): string;
/** Read a cached preview (in-memory only — see file header for why). */
export declare function getCachedThumbnail(key: string): string | undefined;
/** Write a preview to the in-memory cache. */
export declare function setCachedThumbnail(key: string, html: string): void;
/** Clear the in-memory cache, plus any stray entries left by an older, localStorage-backed version of this cache. */
export declare function clearThumbnailCache(): void;