/**
 * Vectors are already small, and rasterising untrusted SVG would pull a parser
 * into the request path for no byte saving, so they are served as uploaded.
 */
export declare function isThumbnailable(mime: string): boolean;
/**
 * Cached preview-sized copy of an image, or null when one cannot be produced —
 * callers serve the original in that case. A file that fails once is not tried
 * again for the life of the process.
 */
export declare function ensureThumbnail(source: string, key: string): Promise<string | null>;
//# sourceMappingURL=image-variants.d.ts.map