import { Buffer } from 'node:buffer';
import type { PreviewResource } from './theme-preview.ts';
export declare function cachedThumbnail(resource: PreviewResource): string | null;
/** Actual local renderer captures; no model calls. Two workers, content-addressed cache. */
export declare function thumbnailService(): {
    capture: (resource: PreviewResource, origin: string) => Promise<Buffer<ArrayBufferLike>>;
    close: () => Promise<void>;
};