/** Get or generate a thumbnail. Returns the path to the JPEG thumbnail. */
export declare function getThumbnail(srcPath: string, contentType: string, cacheDir: string, fileId: string): Promise<string | null>;
/** Generate a thumbnail and write it to cacheDir. Returns path to JPEG. */
export declare function generateThumbnail(srcPath: string, contentType: string, cacheDir: string, fileId: string): Promise<string | null>;
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