import { Cfb } from "./cfb/index.js";
export declare const parsePreview: (data: Uint8Array) => Blob;
export interface ThumbnailSuccess {
    ok: true;
    data: Blob;
    error?: never;
}
export interface ThumbnailError {
    ok: false;
    data?: never;
    error: string;
}
export type ThumbnailResult = ThumbnailSuccess | ThumbnailError;
export declare const thumbnail: (cfb: Cfb) => Promise<Blob>;
export declare const tryThumbnail: (cfb: Cfb) => Promise<ThumbnailResult>;