export interface EncryptionOptions {
    spinCount?: number;
}
export declare function encryptWorkbook(xlsxData: Uint8Array, password: string, options?: EncryptionOptions): Promise<Uint8Array>;
export declare function decryptWorkbook(encryptedData: Uint8Array, password: string): Promise<Uint8Array>;
export declare function isEncrypted(data: Uint8Array): boolean;