declare function blobToBase64(blob: Blob): Promise<string>;
declare function downloadStream(data: string, headers: Headers): Promise<void>;
declare function print(data: string, dataType: 'base64' | 'blob', mimeType?: string): void;
declare function base64ToArrayBuffer(data: string): Uint8Array;
declare function fileExists(url: string): Promise<boolean>;

export { base64ToArrayBuffer, blobToBase64, downloadStream, fileExists, print };